阅读说明：本技术 一种用于精准部位抽吸和注射的钝针 (Blunt needle for precise site suction and injection ) 是由 赵晓培 张娟丽 李伟甲 孟兵涛 杨会 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种用于精准部位抽吸和注射的钝针,包括密封套装在注射筒排液头上的针座,还包括偏心针头,偏心针头的尾端匹配安装在针座内,并通过针座与排液头的排液口密封连通；所述针座包括连接座、外套壳和回转伸缩机构,所述连接座尾端匹配套装在排液头上,且连接座前端中部沿轴向开有与排液头连通的过渡通道；本发明结构独特,使用方便,不仅能够在进针过程中自动避让血管,有效的解决了现有钝针在使用时容易刺破组织内血管的问题；而且在使用时单次进针便能够完成大面积注射或抽取,从而还有效的解决了现有钝针在使用时需要多次进针才能够完成大面积抽取或注射的问题。(The invention discloses a blunt needle for precise part suction and injection, which comprises a needle seat and an eccentric needle head, wherein the needle seat is hermetically arranged on a liquid discharge head of an injection tube; the needle seat comprises a connecting seat, an outer casing and a rotary telescopic mechanism, the tail end of the connecting seat is sleeved on the liquid discharge head in a matching mode, and the middle of the front end of the connecting seat is provided with a transition channel communicated with the liquid discharge head along the axial direction; the invention has unique structure and convenient use, can automatically avoid blood vessels in the process of needle insertion, and effectively solves the problem that the conventional blunt needle is easy to puncture blood vessels in tissues when in use; and when in use, the injection or the extraction with large area can be finished by single needle insertion, thereby effectively solving the problem that the injection or the extraction with large area can be finished by the multiple needle insertion of the existing blunt needle when in use.)

1. A blunt needle used for accurate position suction and injection comprises a needle seat which is hermetically sleeved on a liquid discharge head of an injection tube, and is characterized by also comprising an eccentric needle head, wherein the tail end of the eccentric needle head is installed in the needle seat in a matching way and is hermetically communicated with a liquid discharge port of the liquid discharge head through the needle seat; the needle seat comprises a connecting seat, an outer casing and a rotary telescopic mechanism, the tail end of the connecting seat is sleeved on the liquid discharge head in a matching mode, and the middle of the front end of the connecting seat is provided with a transition channel communicated with the liquid discharge head along the axial direction; the outer casing is fixedly sleeved on the connecting seat, a columnar cavity is coaxially arranged in the outer casing on the front side of the connecting seat, and the columnar cavity is communicated with an internal channel of the connecting seat; a pinhole communicated with the outside is arranged in the middle of the front cavity wall of the columnar cavity along the axial direction; the rotary telescopic mechanism comprises a rotary sleeve, a limiting ring and a return spring, the rotary sleeve is sleeved in the columnar cavity in a matching mode, a spiral sliding groove is formed in the inner ring wall of the rotary sleeve along the axial direction, the tail end of the eccentric needle head is sleeved in the needle penetrating hole in a matching mode, the tail end of the eccentric needle head penetrates through the rotary sleeve in a sealing mode, is inserted into the transition channel of the connecting seat, and can rotate and slide along the inner wall of the transition channel; the limiting ring is fixedly sleeved on the eccentric needle head in the rotary sleeve, one side of the rotary sleeve is connected with the spherical sliding block which is slidably embedded into the sliding groove, the reset spring is sleeved on the eccentric needle head between the limiting ring and the connecting seat in a matching mode, and the reset spring can push the limiting ring to drive the spherical sliding block to rotate and slide forwards along the sliding groove in a natural state.

2. The blunt needle for precision site aspiration and injection of claim 1 wherein the eccentric needle is subjected to a resistance force greater than the minimum working load of the return spring when the eccentric needle penetrates deep into fat.

3. The blunt needle for precise site aspiration and injection according to claim 1, wherein the connecting seat has a fixing groove formed at the rear end thereof in the axial direction for fitting with the discharge head, and the fixing groove is fitted and sealed to be nested on the discharge head.

4. The blunt needle for precise site aspiration and injection according to claim 3, wherein the inner ring arm of the fixing groove is circumferentially provided with an annular groove and is fittingly installed with a sealing ring, and when the connecting seat is fittingly nested on the discharge head, the sealing ring in the fixing groove is deformed by the extrusion of the connecting seat and the discharge head.

5. The blunt needle for precise site aspiration and injection according to claim 3, wherein a rounded chamfer is provided at a rear end notch of the fixing groove.

6. The blunt needle for precise site aspiration and injection according to claim 1, wherein the eccentric needle comprises a needle stem, the tail end of the needle stem is sleeved in the needle hole in a matching manner, the tail end of the needle stem penetrates through the rotary sleeve and is inserted into the transition channel of the connecting seat in a sealing manner, the top end of the needle stem is provided with a spherical needle point in a sealing manner, a liquid discharge port communicated with the inside is formed in the circumferential side wall of the needle stem on the rear side of the spherical needle point along the radial direction, and the spherical needle point and the needle stem are arranged eccentrically.

7. The blunt needle for precise site aspiration and injection according to claim 6, wherein three liquid discharge ports are formed on the circumferential side wall of the needle stem at the rear side of the spherical needle tip at intervals along the circumference, and the three liquid discharge ports are all radially arranged to communicate with the inner channel of the needle stem.

8. The blunt needle for precise location suction and injection according to claim 1, wherein the outer cylinder wall of the connecting socket is provided with a threaded section along the axial direction, the outer casing is fittingly sleeved on the threaded section of the connecting socket, and the outer casing is in threaded connection with the connecting socket.

9. The blunt needle for precision site aspiration and injection according to claim 8 wherein a plurality of strip-shaped protrusions are formed on the outer circumferential surface of the trailing end of the connection housing at intervals along the circumference, and the strip-shaped protrusions are formed along the axial direction.

10. The blunt needle for precise location aspiration and injection according to claim 1, wherein a sealing member is fittingly provided in the front end of the transition passage of the connecting base, the rear end of the eccentric needle is fittingly inserted into the fixed passage through the sealing member, and the sealing member can enhance the sealing strength between the outer circumferential surface of the eccentric needle and the inner circumferential arm of the transition passage without affecting the rotation and sliding of the rear end of the eccentric needle in the transition passage.

Technical Field

The invention belongs to the technical field of medical cosmetology, and particularly relates to a blunt needle for precise part suction and injection.

Background

Common items such as puncture, injection and the like cannot be separated in the medical cosmetic and cosmetology, such as clinical venipuncture, shaped fat autograft, hyaluronic acid injection, wrinkle removal and the like; the needles and devices for extraction and injection are different, and the damage to cells and medicines is also different; the traditional sharp needle is easy to damage cells, blood vessels, nerves and fibrous structures by extraction and injection, and is easy to cause blood stasis and swelling after operation. In addition, the sharp needle has short length and limited injection range, and can not inject deeper parts, thereby bringing technical limitation; the blunt needle is longer than the sharp needle, can reach 5-10cm, can reach a deeper position for injection or extraction, has relatively simple hierarchical control, has less strict operation requirements on medical care personnel, and has been widely accepted in the medical and cosmetic industries in recent years.

However, in the using process, although the fat in the tissue is soft, and the top end of the blunt needle is blunt round, the blunt needle can smoothly move forward in the tissue, but because the blood vessel is in a net shape in the human body, the blood vessel is everywhere, and the blood vessel has certain rigidity, when the top end of the blunt needle head touches the blood vessel, if the needle is still forcibly fed inwards, the top end of the needle head can pierce the blood vessel, so that the bleeding in the tissue causes bruise and swelling in a puncture area, and even some fillers can enter the blood vessel to cause embolism, thereby affecting the health; and the top end of the existing blunt needle is provided with a liquid outlet, when extraction or injection is carried out, the single extraction amount or the injection amount is less, and large-area extraction or injection can be completed only by inserting the needle for many times, thereby further aggravating postoperative wound of a patient.

Disclosure of Invention

Aiming at the defects and problems of the existing blunt needle, the invention provides the blunt needle for precise part suction and injection, which has unique structure and convenient use, not only can automatically avoid blood vessels in the needle insertion process, but also effectively solves the problem that the existing blunt needle is easy to puncture blood vessels in tissues when in use; and when in use, the injection or the extraction with large area can be finished by single needle insertion, thereby effectively solving the problem that the injection or the extraction with large area can be finished by the multiple needle insertion of the existing blunt needle when in use.

The technical scheme adopted by the invention for solving the technical problems is as follows: a blunt needle for precise position suction and injection comprises a needle seat which is hermetically mounted on a liquid discharge head of an injection tube, and also comprises an eccentric needle head, wherein the tail end of the eccentric needle head is mounted in the needle seat in a matching way and is communicated with a liquid discharge port of the liquid discharge head in a sealing way through the needle seat; the needle seat comprises a connecting seat, an outer casing and a rotary telescopic mechanism, the tail end of the connecting seat is sleeved on the liquid discharge head in a matching mode, and the middle of the front end of the connecting seat is provided with a transition channel communicated with the liquid discharge head along the axial direction; the outer casing is fixedly sleeved on the connecting seat, a columnar cavity is coaxially arranged in the outer casing on the front side of the connecting seat, and the columnar cavity is communicated with an internal channel of the connecting seat; a pinhole communicated with the outside is arranged in the middle of the front cavity wall of the columnar cavity along the axial direction; the rotary telescopic mechanism comprises a rotary sleeve, a limiting ring and a return spring, the rotary sleeve is sleeved in the columnar cavity in a matching mode, a spiral sliding groove is formed in the inner ring wall of the rotary sleeve along the axial direction, the tail end of the eccentric needle head is sleeved in the needle penetrating hole in a matching mode, the tail end of the eccentric needle head penetrates through the rotary sleeve in a sealing mode, is inserted into the transition channel of the connecting seat, and can rotate and slide along the inner wall of the transition channel; the limiting ring is fixedly sleeved on the eccentric needle head in the rotary sleeve, one side of the rotary sleeve is connected with the spherical sliding block which is slidably embedded into the sliding groove, the reset spring is sleeved on the eccentric needle head between the limiting ring and the connecting seat in a matching mode, and the reset spring can push the limiting ring to drive the spherical sliding block to rotate and slide forwards along the sliding groove in a natural state.

Further, when the eccentric needle penetrates into fat, the resistance force borne by the eccentric needle is larger than the minimum working load of the return spring.

Furthermore, the tail end of the connecting seat is axially provided with a fixing groove matched with the liquid discharge head, and the fixing groove is matched, sealed and nested on the liquid discharge head.

Furthermore, an annular groove is formed in the inner annular arm of the fixing groove along the circumference, a sealing ring is installed in a matching mode, and when the connecting seat is nested on the liquid discharging head in a matching mode, the sealing ring in the fixing groove can be deformed by the extrusion of the connecting seat and the liquid discharging head.

Furthermore, a round chamfer is arranged at the notch at the rear end of the fixing groove.

The eccentric needle comprises a needle stem, the tail end of the needle stem is sleeved in the needle penetrating hole in a matching mode, the tail end of the needle stem penetrates through the rotary sleeve and is inserted into the transition channel of the connecting seat in a sealing mode, the top end of the needle stem is provided with a spherical needle point in a sealing mode, a liquid discharge port communicated with the inside of the needle stem is formed in the circumferential side wall of the needle stem on the rear side of the spherical needle point in the radial direction, and the spherical needle point and the needle stem are arranged in an eccentric mode.

Furthermore, three liquid discharge ports are formed in the circumferential side wall of the needle stem on the rear side of the spherical needle point at intervals along the circumference, and the three liquid discharge ports are all radially arranged and communicated with the inner channel of the needle stem.

Furthermore, a thread section is axially arranged on the outer cylinder wall of the connecting seat, the outer sleeve shell is sleeved on the thread section of the connecting seat in a matching manner, and the outer shell is in threaded connection with the connecting seat.

And furthermore, a plurality of strip-shaped bosses are arranged on the outer annular surface of the tail end of the connecting shell at intervals along the circumference and are arranged along the axial direction.

Furthermore, a sealing element is arranged in the front end of the connecting seat transition channel in a matching mode, the tail end of the eccentric needle head penetrates through the sealing element to be inserted into the fixed channel in a matching mode, and the sealing element can enhance the sealing strength between the outer annular surface of the eccentric needle head and the inner annular arm of the transition channel on the premise that the tail end of the eccentric needle head rotates and slides in the transition channel.

The invention has the beneficial effects that: the blunt needle for precise position suction and injection provided by the invention has a unique structure, and comprises a needle seat which is hermetically sleeved on a liquid discharge head of an injection tube, wherein an eccentric needle head is arranged on the needle seat, the needle seat adopts a split type assembly design, and the needle seat comprises a connecting seat, an outer casing and a rotary telescopic mechanism, so that the blunt needle is convenient to process and produce; the eccentric needle comprises a needle stem, the tail end of the needle stem is sleeved in the needle penetrating hole in a matching mode, the tail end of the needle stem penetrates through the rotary sleeve and is inserted into the transition channel of the connecting seat in a sealing mode, the top end of the needle stem is provided with a spherical needle point in a sealing mode, a liquid discharge port communicated with the inside is formed in the circumferential side wall of the needle stem behind the spherical needle point in the radial direction, and the spherical needle point and the needle stem are arranged in an eccentric mode.

In the using process, the eccentric needle can be controlled to penetrate into tissues to perform suction operation by holding the injection tube by hand, and in the penetrating process, the needle point at the top end of the eccentric needle is spherical, so that the eccentric needle can smoothly shuttle in the tissues; when the spherical needle point at the top end of the eccentric needle head is contacted with the blood vessel in the tissue in the process of the penetration of the eccentric needle head, the extrusion force applied to the return spring in the rotary telescopic mechanism is increased by continuously pushing the eccentric needle head into the tissue through the injection tube, thereby the reset spring is further compressed by extrusion, the needle stem part is retracted into the needle seat, the needle stem drives the needle tip to rotate in the process, and the spherical needle tip of the eccentric needle head and the needle stem are eccentrically arranged, so that when the needle stem retracts and rotates, the spherical needle point contacted with the blood vessel in the tissue can rotate around the central shaft of the needle stem along with the needle stem, is separated from the contacted blood vessel and automatically avoids the blood vessel, when the eccentric needle head penetrates into the tissue, the eccentric needle head can automatically avoid the blood vessel in the tissue and cannot pierce the blood vessel in the tissue, the use is convenient, and the problem that the existing blunt needle is easy to pierce the blood vessel in the tissue when in use is effectively solved;

and because when the fat of the deep tissue of eccentric syringe needle, the resistance that the eccentric syringe needle receives is greater than reset spring minimum work load, thereby when injecting the injection thing or outwards extracting the fat in to the tissue, through outwards pulling the injection tube slightly, reduce the pressure that the reset spring that gyration telescopic machanism received, make its automatic extension, and reset spring can order about the spacing ring at the extension in-process and drive the needle stalk and rotate, when the needle stalk rotates, the needle stalk that is located the tissue can rotate in step, can the omnidirectional inject or extract to the operation position, thereby give the area that has increased injection or extraction, the effectual problem of current blunt needle need advance the needle many times when using just can accomplish large tracts of land extraction or injection.

The invention provides a blunt needle for precise position suction and injection, which has unique structure and convenient use, can automatically avoid blood vessels in the process of needle insertion, and effectively solves the problem that the existing blunt needle is easy to puncture blood vessels in tissues when in use; and when in use, the injection or the extraction with large area can be finished by single needle insertion, thereby effectively solving the problem that the injection or the extraction with large area can be finished by the multiple needle insertion of the existing blunt needle when in use.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is an enlarged schematic view of the structure at a in fig. 1.

Fig. 3 is a schematic view of the structure of the needle holder of the present invention.

Fig. 4 is a schematic view of the connecting seat structure of the present invention.

Fig. 5 is a schematic perspective view of the rotary sleeve of the present invention.

FIG. 6 is a schematic view of the internal structure of the rotary sleeve of the present invention.

FIG. 7 is a schematic view of the connection between the ball slider and the sliding sleeve according to the present invention.

FIG. 8 is a schematic view of the position of the chamfer on the connecting seat according to the present invention.

FIG. 9 is a schematic view of the arrangement position of the bar-shaped bosses of the present invention.

Fig. 10 is a schematic diagram of the arrangement position of three liquid outlets of the eccentric needle of the present invention.

FIG. 11 is a schematic view of the sliding adjustment part of the needle holder according to the present invention.

Fig. 12 is an enlarged schematic view of the structure at B in fig. 11.

Fig. 13 is a schematic perspective view of the second rotary sleeve of the present invention.

FIG. 14 is a schematic view of a dual ramp configuration in a swivel sleeve according to the present invention.

FIG. 15 is a schematic view of the structure of the pressing member of the present invention.

Fig. 16 is another view structure diagram of the pressing member of the present invention.

Reference numbers in the figures: 1 is injection tube, 11 is the leakage fluid head, 2 is the needle file, 21 is the connecting seat, 211 is transition passageway, 212 is the fixed slot, 213 is round chamfer, 22 is outer cover shell, 221 is the column cavity, 2211 is for wearing the pinhole, 222 is the bar boss, 223 is the extrusion chamber, 3 is eccentric syringe needle, 31 is the needle stalk, 32 is spherical needle point, 33 is the liquid outlet, 4 is gyration telescopic machanism, 41 is the cover of revolving, 411 is the spout, 42 is the spacing ring, 43 is reset spring, 44 is spherical slider, 51 is the sliding sleeve, 511 is the extrusion seam, 52 is the lock sleeve, 53 is the thread bush, 54 is the guide block, 55 is the guide ring. 6 is an extrusion component, 61 is an extrusion block, and 62 is a puller bolt.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Example 1

In the use process of the existing blunt needle, although fat in human tissues is soft, and the top end of the blunt needle is blunt round, the blunt needle can smoothly move forwards in the tissues, but because blood vessels are in a net shape in the human body, everywhere is and the blood vessels have certain rigidity, when the top end of the needle head of the blunt needle touches the blood vessels, if the needle head still forcibly sends the blood vessels inwards, the top end of the needle head can pierce the blood vessels, so that internal bleeding of the tissues causes bruise and swelling in a puncture area, and even some fillers can enter the blood vessels to cause embolism, thereby affecting health; and the top end of the existing blunt needle is provided with a liquid outlet, when extraction or injection is carried out, the single extraction amount or the injection amount is less, and large-area extraction or injection can be completed only by inserting the needle for many times, thereby further aggravating postoperative wound of a patient.

In view of the above problems, the present embodiment provides a blunt needle for precise site aspiration and injection, as shown in fig. 1-7, comprising a needle base 2 hermetically mounted on a liquid discharge head 11 of an injection tube 1, and further comprising an eccentric needle 3, wherein the eccentric needle 3 comprises a needle stem 31 mounted in the needle base in a matching manner, a spherical needle point 32 is arranged at the top end of the needle stem 31 in a sealing manner, a liquid outlet 33 communicated with the inside is radially formed on the circumferential side wall of the needle stem 31 at the rear side of the spherical needle point 32, and the spherical needle point 32 and the needle stem 31 are eccentrically arranged; the needle stem 31 is communicated with the liquid outlet of the injection head in a sealing way through the needle seat 2, so that when a piston in the injection tube 1 is pushed, an injection in the injection tube can enter the needle stem through the needle seat 2 and be discharged from the liquid outlet; the needle point at the top end of the eccentric needle is spherical, so that the eccentric needle can smoothly shuttle in tissues.

The needle base 2 comprises a connecting base 21, an outer casing 22 and a rotary telescopic mechanism, the tail end of the connecting base 21 is sleeved on the liquid discharge head 11 in a matching mode, a transition channel 211 which is communicated with a liquid discharge port of the liquid discharge head 11 in a sealing mode is formed in the middle of the front end of the connecting base 21 in the axial direction, when a piston in an injection tube is pushed forwards, an injection object in the injection tube can be extruded forwards through the plug, and the injection object can be discharged into the transition channel 211 of the connecting base through the liquid discharge head 11; when the piston in the injection tube 1 is pulled backwards, negative pressure can be synchronously generated in the excessive passage of the connecting seat; there are various ways of connecting joint holder 21 and liquid discharge head 11, for example: the connecting seat tail end is opened along the axial has the fixed slot 212 with the leakage fluid head looks adaptation to the sealed nestification of matching is on the leakage fluid head, and is further, it has the ring channel to open along the circumference on the inner ring wall of fixed slot, and the matching is installed the sealing washer, and after connecting seat 21 matches the nestification on the leakage fluid head, the sealing washer in the fixed slot can receive the extrusion production deformation of connecting seat and leakage fluid head, thereby closely contradict together with ring channel inner wall and 11 outer ring walls of leakage fluid head, has further strengthened the leakproofness between connecting seat and the leakage fluid head.

Outer casing 22 is fixedly sleeved on connecting seat 21, and cylindrical cavity 221 is coaxially arranged in outer casing 22 at the front side of connecting seat 21, and the tail end of cylindrical cavity 221 is communicated with transition channel 211 in connecting seat 21; the middle part of the front cavity wall of the columnar cavity 221 is provided with a needle penetrating hole 2211 communicated with the outside along the axial direction, and the eccentric needle head 32 is inserted into the needle seat through the needle penetrating hole 2211.

The rotary telescopic mechanism comprises a rotary sleeve 41, a limiting ring 42 and a return spring 43, the rotary sleeve 41 is sleeved in the cylindrical cavity in a matching way, the front end and the rear end of the rotary sleeve 41 are respectively contacted with the front cavity wall of the cylindrical cavity and the front end face of the connecting seat in a jacking way, a spiral chute 411 is arranged on the inner annular wall of the rotary sleeve 41 along the axial direction, the tail end of the needle stem 31 of the eccentric needle head 3 is sleeved in the needle penetrating hole in a matching and sealing way, and the tail end of the needle stem penetrates through the rotary sleeve to be inserted into a transition channel of the connecting seat in a sealing way, and can rotate and slide along the inner wall of the transition channel, the limit ring is fixedly sleeved on the needle stem 31 in the rotary sleeve, one side of the rotary sleeve is connected with a spherical slide block which is slidably embedded into the slide groove, when the needle stem slides along the axial direction, the ball-shaped slide block 44 in the slide slot 411 can be driven by the limit ring to slide along the slide slot 411, so that the needle stem is driven to synchronously rotate along the slide slot in the rotary sleeve 41 when sliding along the axial direction.

The reset spring 43 is sleeved on the needle stem 31 between the limit ring 42 and the connecting seat 21 in a matching manner, two ends of the reset spring 43 are respectively contacted with the limit ring and the connecting seat of adjacent detection, the reset spring can push the limit ring to drive the spherical sliding block to rotate forwards along the sliding groove in a natural state, so that the limit ring is contacted with the front cavity wall of the columnar cavity, and when the eccentric needle head goes deep into fat, the resistance force borne by the eccentric needle head is greater than the minimum working load of the reset spring, so that when the eccentric needle head goes deep into fat, the eccentric needle head can extrude the reset spring 42 to generate retraction deformation through the limit ring, when a piston in the injection tube is pushed forwards, the injection liquid discharged by the liquid discharge head 11 can enter the needle stem through the transition channel 211, and the liquid outlet at the front end of the needle stem is discharged.

Furthermore, a sealing element is arranged in the front end of the transition channel of the connecting seat 21 in a matching manner, and the sealing element enhances the sealing strength between the outer annular surface of the eccentric pinhead and the inner annular arm of the transition channel on the premise of not influencing the rotation and the sliding of the pinstem in the transition channel; the sealing member has various structural forms, such as: the sealing member includes the sealing washer, it has cyclic annular mounting groove to open along the circumference on the inner ring arm of transition passageway front end, the sealing washer matches and installs in the mounting groove in the transition passageway, and outside protrusion mounting groove, the sealing washer that the needle stalk tail end passed in the transition passageway extends inserts in the transition passageway, and the sealing washer in the transition passageway can receive the extrusion of male needle stalk to produce deformation, thereby can be under the condition that does not influence the needle stalk and move in the transition passageway, strengthen needle stalk and transition passageway between sealing strength.

The blunt needle for precise position suction and injection provided by the embodiment has a unique structure, adopts a split assembly design, is convenient for processing and production, when in assembly, firstly, a rotary sleeve of a rotary telescopic mechanism is installed in a cylindrical cavity of an outer casing 22 in a matching way, then the tail end of a needle stem 31 of an eccentric needle 3 is inserted into the outer casing 22 through a needle hole 2211 at the top end of the outer casing, the position of the needle stem, which is provided with a limiting ring 42, extends out from the other end of the outer casing, then the limiting ring is sleeved on the needle stem in a matching way, the eccentric needle 3 is rotated and pulled forwards, the needle stem drives the limiting ring to enter the outer casing, a spherical sliding block on the limiting ring enters the sliding way from a port of a sliding groove in the process of rotating along with the needle stem, then a reset spring is sleeved on the needle stem from the outer end of the outer casing, then a connecting seat 21 is sleeved in the outer casing 22 in a matching way from the tail end of the outer casing, in this in-process needle stalk tail end can match the excessive passageway of inserting the connecting seat, after the connecting seat installation targets in place, reset spring can automatic ejection spacing ring drive globular slider along the spout rotational sliding forward, makes the preceding cavity wall top of spacing ring and column cavity touch together, and the blunt needle equipment that this embodiment provided this moment is accomplished, and alright packing after the disinfection, when using, the blunt needle after accomplishing the equipment matches and installs alright direct use on the flowing back head of injection tube 1.

During the use process, the eccentric needle head can be controlled to penetrate into the tissue to perform suction operation by holding the injection tube by hand, and during the penetration process, as the needle point at the top end of the eccentric needle head is spherical, the eccentric needle head can smoothly shuttle in the tissue, during the penetration process of the eccentric needle head, when the spherical needle point at the top end of the eccentric needle head is contacted with the blood vessel in the tissue, the eccentric needle head is continuously pushed into the tissue through the injection tube, so that the extrusion force applied to the reset spring in the rotary telescopic mechanism is increased, and the reset spring is further compressed by extrusion, so that the needle stem part is retracted into the needle seat 2, during the process, the needle stem in the rotary telescopic mechanism 4 drives the spherical sliding block to slide backwards along the sliding groove 411 through the limiting ring 42, so as to drive the needle stem 31 to synchronously rotate, as the spherical needle point 32 of the eccentric needle head 3 and the needle stem 31 are eccentrically arranged, so that when the needle stem 31 retracts and rotates, the spherical needle point contacted with the blood vessel in the tissue can rotate around the central shaft of the needle stem 31 along with the needle stem 31, is separated from the contacted blood vessel and automatically avoids the blood vessel, so that the eccentric needle head can automatically avoid the blood vessel in the tissue when penetrating into the tissue, the blood vessel in the tissue can not be punctured, the use is convenient, and the problem that the blood vessel in the tissue is easily punctured by the existing blunt needle when in use is effectively solved; and because when the fat of the deep tissue of eccentric syringe needle, the resistance that the eccentric syringe needle receives is greater than reset spring minimum work load, thereby when injecting the injection thing or outwards extracting the fat in to the tissue, through outwards pulling the injection tube slightly, reduce the pressure that the reset spring that gyration telescopic machanism received, make its automatic extension, and reset spring can order about the spacing ring at the extension in-process and drive the needle stalk and rotate, when the needle stalk rotates, the needle stalk that is located the tissue can rotate in step, can the omnidirectional inject or extract to the operation position, thereby give the area that has increased injection or extraction, the effectual problem of current blunt needle need advance the needle many times when using just can accomplish large tracts of land extraction or injection.

Example 2

Embodiment 2 differs from embodiment 1 in that, as shown in fig. 8, a round chamfer 213 is provided at the rear end notch of fixing groove 212, and when connecting holder 21 is fitted onto liquid discharge head 11 from the front end of liquid discharge head 11 rearward, round chamfer 213 has a guiding function to facilitate insertion of connecting holder 21 onto liquid discharge head 11 rearward.

Example 3

The difference between embodiment 3 and embodiment 2 is that the linking relationship between the outer casing 22 and the connecting seat is different, as shown in fig. 9, a threaded section is axially provided on the outer cylinder wall of the connecting seat, the outer casing is fittingly sleeved on the threaded section of the connecting seat, and the outer casing is in threaded connection with the connecting seat, further, a plurality of strip-shaped bosses 222 are circumferentially provided at intervals on the outer annular surface connecting the tail end of the outer casing 22, and the strip-shaped bosses 22 are axially provided, so that when the outer casing 22 is screwed, the strip-shaped bosses 222 can increase the friction between fingers and the connecting surgery.

Example 4

Embodiment 4 is different from embodiment 3 in that, as shown in fig. 10, three liquid outlets are formed on the circumferential side wall of the needle stem at the rear side of the spherical needle point at intervals along the circumference, and the three liquid outlets are all radially arranged to be communicated with the inner channel of the needle stem, compared with embodiment 3, the three liquid outlets 33 on the eccentric needle head of the present embodiment are uniformly arranged along the circumference, and can inject in 360 degrees in multiple directions, so that the skin activation area is increased, when in use, large-area injection can be completed by one-time needle insertion, the needle insertion point is reduced, and postoperative wound is avoided. Meanwhile, when cells such as fat cells are sucked and injected, the number of the sucked or injected cells or fat particles can be increased, when the cells are injected, the cells can be slowly and uniformly injected to an operation part in an all-round way through the backflow at the top end of the eccentric needle head, any impact and pressure on the cells can not be caused, and the survival rate of the cells is improved.

Example 5

Embodiment 5 differs from embodiment 4 in that a needle stem slide adjusting part is provided on the needle stem outside the needle holder.

As shown in fig. 11 and 12, a needle stem sliding adjusting component is arranged on the needle stem, the needle stem sliding adjusting component comprises a sliding sleeve 51, a locking sleeve 52 and a threaded sleeve 53, the sliding sleeve is sleeved on the needle stem at the front side of the needle base 2 in a matching manner, the tail end of the sliding sleeve is in top contact with the front end of the outer casing of the needle base, a plurality of extrusion seams 511 are arranged at intervals along the circumference on the front end surface, the extrusion seams are arranged along the radial direction and penetrate through the sliding sleeve, a trapezoidal guide block 54 is fixed on the sliding sleeve between every two extrusion seams, the trapezoidal guide blocks are arranged along the circumference, the inclined planes of the trapezoidal guide blocks are arranged forwards, the locking sleeve is coaxially sleeved outside the sliding sleeve, the extrusion blocks arranged along the circumference on the sliding sleeve are all positioned in the locking sleeve, a conical guide ring 55 is fixed in the locking sleeve at the front side of the extrusion blocks, the inclined plane of the guide ring is arranged towards the extrusion blocks and is in contact with the inclined plane of the extrusion blocks, an external thread is arranged on the outer annular surface of the front section of the outer casing in a matching manner, the thread bush matches the suit on the external screw thread of overcoat shell front end, and can follow the screw thread and rotate the slip around, the front end of thread bush extends overcoat shell 22 forward, and with lock sleeve trailing end connection, when driving the lock sleeve through rotating the thread bush and being close to along the sliding sleeve outer loop towards needle file 2, the guide block that the lock sleeve inner guide ring can extrude contact with it inwards extrudes the sliding sleeve along the guide ring inclined plane, thereby adjust the frictional force between sliding sleeve and the needle stalk, compare with embodiment 4, blunt needle that this embodiment provided when using, can adjust the frictional force between sliding sleeve and the needle stalk through needle stalk slip adjustment part according to the demand, thereby adjust the degree that reset spring compressed when eccentric syringe needle gos deep into the tissue, make blunt needle have and adjust its pressure under what kind of pressure has the flexible function of rotation, blunt needle's suitability has been increased.

Example 6

The embodiment 6 is different from the embodiment 5 in that, as shown in fig. 13, the cylindrical cavity is a 6-prism-shaped cavity, and the outer end surface of the rotary sleeve 41 is a hexagonal prism shape matched with the cylindrical cavity, so that after the rotary sleeve 41 is fittingly installed in the cylindrical cavity, the rotary sleeve 41 cannot freely rotate in the cylindrical cavity due to the special shape of the rotary sleeve 41, and the rotary sleeve 41 does not need to be independently fixed.

Example 7

The difference between the embodiment 7 and the embodiment 6 is that, as shown in fig. 14, two spiral sliding grooves 411 are axially formed on the inner annular wall of the rotary sleeve 41, the pitch and the number of turns of the two sliding grooves are the same, the ports of the two sliding grooves 411 are arranged oppositely, the left end and the right end of the limiting ring 41 on the needle stem in the rotary sleeve are symmetrically provided with spherical sliding blocks which are connected with each other, the two spherical sliding blocks are arranged at intervals along the axial direction, and the spherical sliding blocks at the left and right ends of the limiting ring 41 are respectively inserted into the corresponding sliding slots 411 in a sliding manner, when the limiting ring 41 axially slides in the rotating sleeve, the limiting ring 41 drives the spherical sliding blocks at the two sides to slide in the corresponding sliding grooves, thereby order about spacing ring 41 and order about the needle stalk rotation when axial slip, compare with embodiment 6, this embodiment through set up two spouts and two shape sliders of asking, make the both ends of spacing ring all have the support to can make the motion of spacing ring more stable.

Example 8

The difference between the embodiment 8 and the embodiment 5 is that the rotary sleeve is rotatably sleeved in the cylindrical cavity 221, the outer sleeve shell on one side of the cylindrical cavity is provided with an extrusion cavity 223 communicated with the cylindrical cavity, and an extrusion part is arranged in the extrusion cavity.

As shown in fig. 15 and 16, the rotary sleeve is rotatably sleeved in the cylindrical cavity 221, an extrusion cavity 223 communicated with the cylindrical cavity is formed in the outer sleeve shell on one side of the cylindrical cavity, an extrusion component is arranged in the extrusion cavity, and the rotary sleeve 41 is sleeved in various ways, for example: the front end and the rear end of the rotary sleeve 41 are sleeved with shaft sleeves, and are rotatably sleeved in the columnar cavities through the shaft sleeves; the extrusion part comprises an extrusion block 61 and a puller bolt 62, the extrusion block 61 is sleeved in an extrusion cavity 223 on the right side of the columnar cavity in a matching mode, one end, facing the columnar cavity, of the extrusion block 51 is a soft concave arc surface matched with the outer annular surface of the rotary sleeve 41, the puller bolt is rotatably installed on the end face, far away from the columnar cavity, of the extrusion block 61 and penetrates through the outer casing to extend to the outside of the outer casing, the puller bolt 62 is in threaded connection with a contact part, when the puller bolt is rotated, the puller bolt drives the compression block 61 to slide along the wall of the extrusion cavity to be close to or far away from the rotary sleeve, when the puller bolt 62 is screwed to drive the concave arc surface of the extrusion block to penetrate into the columnar cavity 221 and tightly abut against the outer annular surface of the rotary sleeve, the rotary sleeve 41 is jacked to be fixed, so that the rotary sleeve loses the rotation function, when the eccentric puncture syringe needle is in contact with a blood vessel, the eccentric push needle is continued to push the injection tube into the tissue so that the extrusion cavity can cause the return spring of the rotary telescopic mechanism to be extruded The force is increased, so that the return spring is further compressed due to extrusion, the needle stem part is retracted into the needle seat 2, and in the process, the needle stem in the rotary telescopic mechanism 4 drives the spherical sliding block to slide backwards along the sliding groove 411 through the limiting ring 42 to drive the needle stem 31 to synchronously rotate, so that the blood vessel is avoided;

when the puller bolt 62 is unscrewed to drive the concave arc surface of the extrusion block to separate from the outer annular surface of the rotary sleeve, the rotary sleeve can restore the rotation function again, when the eccentric needle is punctured to contact with a blood vessel, the eccentric needle is continuously pushed into the tissue through the injection tube to increase the extrusion force applied to the reset spring in the rotary telescopic mechanism, the needle stem can slide along the sliding groove 411 in the rotary sleeve 41 through the spherical sliding block on the limiting ring to drive the rotary sleeve to rotate in the cylindrical cavity, therefore, compared with the situation that the eccentric needle head only penetrates into tissues and is subjected to resistance force to drive the limiting ring 42 to drive the eccentric needle head to rotate and retract along the sliding groove in the rotary sleeve, the rotary sleeve 41 in the rotating state can reduce the friction force between the spherical sliding block 44 and the sliding groove to enable the needle stem to retract smoothly, and the rotating friction force of the rotary sleeve 41 can be adjusted according to requirements by adjusting the position control of the extrusion block 61 through the puller bolt.

The foregoing has described the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, for example: the number of runners and ball slides in the swivel housing are increased and such variations and modifications are within the scope of the claimed invention.