阅读说明：本技术 动静脉血管留置器 (Arteriovenous vessel indwelling device ) 是由 冯义国 罗晓明 冯伟 于 2021-09-08 设计创作，主要内容包括：本发明具体公开了一种动静脉血管留置器,包括留置于血管内部的留置器本体,以及与留置器本体一体设置的导管座,导管座位于皮肤外侧,导管座内部的导向腔道与留置器本体的内腔连通,导管座侧壁上设置有出入液口,通过出入液口与连接管连通,连接管的端部设置有隔离塞；留置器本体的中间位置设置有隆起部,隆起部上设置有开口,开口与导管座内部的导向腔道连通,且在开口处设置有遮挡环盘；导向腔道内设置有隔板,隔板位于出液口的上方,隔板的上方设置有调节套筒,调节套筒内部螺纹连接有导向杆,导向杆的下端贯穿隔板进入留置器本体的内腔中,其端部固定连接有卡块,调节套筒的上端固定连接调节座。(The invention particularly discloses an arteriovenous blood vessel indwelling device which comprises an indwelling device body and a catheter seat, wherein the indwelling device body is arranged in a blood vessel, the catheter seat and the indwelling device body are integrally arranged, the catheter seat is positioned outside the skin, a guide cavity channel in the catheter seat is communicated with an inner cavity of the indwelling device body, a liquid inlet and outlet is formed in the side wall of the catheter seat and communicated with a connecting pipe through the liquid inlet and outlet, and an isolating plug is arranged at the end part of the connecting pipe; the middle position of the indwelling device body is provided with a bulge part, the bulge part is provided with an opening, the opening is communicated with a guide cavity channel in the catheter seat, and a shielding ring disc is arranged at the opening; the guide cavity is internally provided with a baffle plate which is positioned above the liquid outlet, an adjusting sleeve is arranged above the baffle plate, a guide rod is connected with the inner part of the adjusting sleeve in a threaded manner, the lower end of the guide rod penetrates through the baffle plate to enter the inner cavity of the indwelling device body, a clamping block is fixedly connected to the end part of the guide rod, and an adjusting seat is fixedly connected to the upper end of the adjusting sleeve.)

1. The arteriovenous blood vessel indwelling device is characterized by comprising an indwelling device body indwelling in a blood vessel and a catheter seat integrally arranged with the indwelling device body, wherein the catheter seat is positioned outside the skin, a guide cavity channel inside the catheter seat is communicated with an inner cavity of the indwelling device body, a liquid inlet and outlet is formed in the side wall of the catheter seat and is communicated with a connecting pipe through the liquid inlet and outlet, and an isolation plug is arranged at the end part of the connecting pipe;

the middle position of the indwelling device body is provided with a bulge part, the bulge part is provided with an opening, the opening is communicated with a guide cavity channel in the catheter seat, and a shielding ring disc is arranged at the opening;

the improved indwelling device is characterized in that a partition plate is arranged in the guide cavity channel and located above the liquid inlet and outlet, an adjusting sleeve is arranged above the partition plate, a guide rod is connected to the inner portion of the adjusting sleeve in a threaded mode, the lower end of the guide rod penetrates through a through hole in the partition plate and enters an inner cavity of the indwelling device body, a clamping block is fixedly connected to the end portion of the guide rod, the clamping block can seal an inner ring of the shielding ring disc, the upper end of the adjusting sleeve is fixedly connected with an adjusting seat, and the adjusting seat is located above the catheter seat and seals a port of the catheter seat.

2. The arteriovenous catheter indwelling device according to claim 1, wherein the guide rod comprises a thread section and a smooth section, the thread section is arranged inside the displacement adjusting sleeve, the diameter of the thread section is larger than that of the smooth section, convex strips which are symmetrical to each other are arranged on the periphery of the smooth section, sliding grooves which are matched with the convex strips are arranged on the inner wall of the through hole, and the sliding grooves penetrate through the upper end surface and the lower end surface of the inner wall.

3. The arteriovenous catheter indwelling device according to claim 2, wherein the upper end surface of the partition plate is provided with a limiting cylinder around the outside of the adjusting sleeve, the upper end of the limiting cylinder is provided with a horizontal ring plate along the circumferential direction thereof, the outer wall of the adjusting sleeve is provided with an annular groove, the horizontal ring plate is positioned in the annular groove, and a buffer component is arranged between the horizontal ring plate and the upper wall and the lower wall of the annular groove.

4. The arteriovenous vessel indwelling device according to claim 3, wherein the buffer member comprises an extrusion spring and a ball, the upper end surface and the lower end surface of the horizontal ring plate are both provided with a plurality of equally spaced mutually symmetrical mounting grooves along the circumferential direction thereof, a connecting hole is provided between the upper and lower mutually symmetrical mounting grooves for communication, the compression spring is mounted in the mounting groove, part of the compression spring is located in the connecting hole, and the compression spring is located in the connecting hole and sleeved outside the part of the ball located in the connecting hole.

5. The arteriovenous catheter indwelling device according to claim 2, wherein a locking member is disposed between the adjusting seat and the catheter seat, the locking member comprises an L-shaped locking member, a support is disposed on an outer wall of an upper end of the catheter seat, a vertical portion of the L-shaped locking member penetrates through the support, an end portion of the vertical portion of the L-shaped locking member is of mushroom head structure, at least two accommodating grooves with downward openings are disposed on a lower end surface of the adjusting seat, inner holes are disposed on two symmetrical side walls of the accommodating grooves, both the inner holes are communicated with the accommodating grooves through fan-shaped openings, a limiting piece is disposed in each of the inner holes, a middle portion of the limiting piece penetrates through the fan-shaped openings and bends with the inside of the accommodating grooves to form a protruding portion, and after the L-shaped locking member is inserted into the accommodating grooves, the protruding portion is clamped below the mushroom head structure.

6. The arteriovenous vessel indwelling device according to claim 5, wherein a plurality of extrusion springs are further provided at the inner bottom of the inner hole, the upper ends of the extrusion springs are all connected with the lower end of the limiting piece, the lower ends of the extrusion springs are all fixedly connected with the inner bottom of the inner hole, and the extrusion springs are distributed at equal intervals along the width direction of the limiting piece.

7. The arteriovenous vessel indwelling device according to claim 1, wherein the outer side wall of the fixture block is provided with a first tapered abutment surface, a first outer mesa and a second outer mesa in sequence from bottom to top, the inner annular wall of the shielding ring disc is provided with a second tapered abutment surface and an inner mesa in sequence from bottom to top, when the fixture block is embedded inside the shielding ring disc, the first tapered abutment surface abuts on the second tapered abutment surface, the first outer mesa is attached to the inner mesa, and the second outer mesa is attached to the top wall of the shielding ring disc.

8. The arteriovenous catheter indwelling device according to claim 7, wherein the outer wall of the second outer table top is further provided with a cone ring in the circumferential direction, the cone ring is as high as the second outer table top, the top wall of the shielding ring disc is provided with a sealing groove matched with the cone ring, and when the clamping block is embedded into the shielding ring disc, the cone ring is limited in the sealing groove.

9. The arteriovenous catheter indwelling of claim 1, wherein the shielding disc outer wall is integrally formed with the inner wall of the raised portion.

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to an arteriovenous vessel indwelling device.

Background

In clinical treatment, arteriovenous puncture needles are widely used in hemodialysis. Hemodialysis usually adopts traditional type metal puncture to artery and vein blood vessel to fix it and carry out dialysis treatment, and this kind of metal pjncture needle only supplies hemodialysis once to use, and the damage that causes the blood vessel is great. In the treatment process, the metal puncture needle is always kept in the blood vessel and is easy to stick to the inner wall of the blood vessel, the blood flow is influenced, and the blood seepage phenomenon is easy to generate at the puncture part.

The arm of the puncture of the patient can not be moved in the hemodialysis process, which causes inconvenience to the patient and causes poor comfort of the patient. The general renal failure patients need hemodialysis for 2-3 times every week, and the repeated puncture of the metal puncture needle causes inevitable damage to blood vessels of the patients, brings pain to the patients, and the workload of clinical nurses is heavier. The artery is thin and difficult to puncture. In order to facilitate arterial puncture, arteriovenous fistula is constructed clinically at present. However, with repeated puncture, arteriovenous fistula grows continuously and moves towards the proximal end. In order to solve the problem of arterial puncture, the invention particularly discloses an arteriovenous vessel indwelling device.

Disclosure of Invention

Aiming at the technical problems, the invention provides an arteriovenous vessel indwelling device which can be used for being placed on the arteriovenous of the upper limb of a human body and is matched with the existing arterial connection tube for hemodialysis. Can realize the purpose of indwelling, avoid puncturing repeatedly, relieve the pain of patients, prevent the blood from extravasating, realize safe indwelling and have safe and reliable use.

The technical scheme adopted by the invention is as follows:

the arteriovenous blood vessel indwelling device comprises an indwelling device body and a catheter seat, wherein the indwelling device body is arranged in a blood vessel, the catheter seat is integrally arranged with the indwelling device body, the catheter seat is positioned outside the skin, a guide cavity channel in the catheter seat is communicated with an inner cavity of the indwelling device body, a liquid inlet and a liquid outlet are formed in the side wall of the catheter seat and communicated with a connecting pipe through the liquid inlet and the liquid outlet, and an isolating plug is arranged at the end part of the connecting pipe;

the middle position of the indwelling device body is provided with a bulge part, the bulge part is provided with an opening, the opening is communicated with a guide cavity channel in the catheter seat, and a shielding ring disc is arranged at the opening;

the improved indwelling device is characterized in that a partition plate is arranged in the guide cavity channel and located above the liquid inlet and outlet, an adjusting sleeve is arranged above the partition plate, a guide rod is connected to the inner portion of the adjusting sleeve in a threaded mode, the lower end of the guide rod penetrates through a through hole in the partition plate and enters an inner cavity of the indwelling device body, a clamping block is fixedly connected to the end portion of the guide rod, the clamping block can seal an inner ring of the shielding ring disc, the upper end of the adjusting sleeve is fixedly connected with an adjusting seat, and the adjusting seat is located above the catheter seat and seals a port of the catheter seat.

Preferably, the guide bar includes screw thread section and smooth section, inside screw thread section displacement adjusting sleeve, and its diameter is greater than the diameter of smooth section, be provided with the sand grip of mutual symmetry on the periphery of smooth section, be provided with the spout with sand grip matched with on the perforation inner wall, the spout runs through the upper and lower terminal surface of inner wall.

Preferably, the upper end face of the partition plate is provided with a limiting cylinder around the outer side of the adjusting sleeve, the upper end of the limiting cylinder is provided with a horizontal ring plate along the circumferential direction of the limiting cylinder, the outer wall of the adjusting sleeve is provided with an annular groove, the horizontal ring plate is located in the annular groove, and a buffer assembly is arranged between the horizontal ring plate and the upper wall and the lower wall of the annular groove.

Preferably, the buffering subassembly includes extrusion spring and ball, the up end of horizontal crown plate and lower terminal surface all are provided with the mounting groove of a plurality of equidistant mutual symmetries along its circumferencial direction, are provided with the connecting hole of intercommunication between two upper and lower mutual symmetries's mounting groove, compression spring installs in the mounting groove, compression spring's part is located the connecting hole, compression spring is located the connecting hole and overlaps the outside at the part that the ball is located the connecting hole.

Preferably, adjust and be provided with the locking subassembly between seat and the pipe seat, the locking subassembly includes L type latch fitting, be provided with a support on the upper end outer wall of pipe seat, the vertical part of L type latch fitting runs through the support, just the vertical part tip of L type latch fitting is the first structure of mushroom head, the lower terminal surface of adjusting the seat is provided with two at least opening storage tanks down, all be provided with the hole on two symmetrical lateral walls of storage tank, two the hole all communicates with the storage tank through fan-shaped opening, two all be provided with spacing piece in the hole, the middle part of spacing piece runs through fan-shaped opening and places the crooked bellying that forms of inslot portion, after L type latch fitting inserted the storage tank, the bellying card is in the first below of mushroom head.

Preferably, the interior bottom of hole still is provided with a plurality of extrusion springs, a plurality of extrusion springs's upper end all is connected with the lower extreme of spacing piece, a plurality of extrusion springs's lower extreme all with the interior bottom fixed connection of hole, a plurality of extrusion springs are along the equidistant distribution of width direction of spacing piece.

Preferably, the outer side wall of the fixture block is sequentially provided with a first tapered abutting surface, a first outer table surface and a second outer table surface from bottom to top, the inner annular wall of the shielding annular disc is sequentially provided with a second tapered abutting surface and an inner table surface from bottom to top, when the fixture block is embedded into the shielding annular disc, the first tapered abutting surface abuts against the second tapered abutting surface, the first outer table surface is attached to the inner table surface, and the second outer table surface is attached to the top wall of the shielding annular disc.

Preferably, the outer wall of the second outer table-board is also provided with a cone ring along the circumferential direction, the cone ring has the same height as the second outer table-board, a sealing groove matched with the cone ring is arranged on the top wall of the shielding ring disc, and when the clamping block is embedded into the shielding ring disc, the cone ring is limited in the sealing groove.

Preferably, the outer wall of the shielding disc and the inner wall of the bulge part are integrally formed.

Compared with the prior art, the invention has the beneficial effects that:

1) the arteriovenous vessel indwelling device of the invention replaces the conventional arterial puncture during hemodialysis, the middle part of the arteriovenous vessel indwelling device is designed into a bulge part which is used for expanding the vessel and playing a role of fixing, the bulge part is provided with an opening, the opening is communicated with a guide cavity channel in a catheter seat, a shielding ring disc is arranged at the opening, the inner ring of the shielding ring disc forms a valve seat, a plug body structure consisting of an adjusting seat, an adjusting sleeve, a guide rod and a fixture block, the guide rod is guided to move up and down by rotating the adjusting seat, the relative position of the fixture block is changed, the fixture block is matched with the shielding ring disc to conduct and close the circulation of blood in the indwelling device, the phenomenon that a puncture needle tube punctures the vessel repeatedly is avoided, the sealing performance of the whole device is good, when the hemodialysis is not needed, the guide rod moves downwards, the fixture block is tightly attached to the inner ring wall of the shielding ring disc, thereby preventing the blood in the indwelling device from flowing to the inner cavity of the guide seat to cause pollution; when the clamping block is communicated with the artery connecting pipe, the guide rod moves upwards, the clamping block moves upwards along with the guide rod, the upper end of the clamping block abuts against the lower end face of the partition plate, the through hole in the partition plate is sealed, and the flowing direction of blood is changed. The whole structure is simple to operate and convenient to use.

2) The indwelling device can be indwelling in a blood vessel to achieve the indwelling purpose, and a puncture needle tube does not need to be inserted and pulled out for many times, so that the pain of a patient is relieved; the artery connecting pipe is matched and connected with the existing artery connecting pipe for hemodialysis, so that hemodialysis is carried out, the operation is simple, multiple injuries of a patient caused by traditional puncture arteriovenous puncture are reduced, and the use is safe and reliable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a sectional view of an arteriovenous indwelling device provided in embodiment 1.

Fig. 2 is a schematic view of a modification of fig. 1 (during hemodialysis).

Fig. 3 is a schematic view of a plug body structure composed of an adjusting seat, an adjusting sleeve, a guide rod and a clamping block in embodiment 1.

Fig. 4 is an enlarged view of a point a in fig. 1.

Fig. 5 is a view showing a part of fig. 4.

Fig. 6 is an enlarged view at B in fig. 1.

Fig. 7 is a partial structural view of the spacing sleeve in fig. 6.

Fig. 8 is a sectional view of an arteriovenous indwelling device according to embodiment 2.

Fig. 9 is a schematic view showing a modification of fig. 8 (in hemodialysis).

Fig. 10 is a schematic view showing a plug body structure composed of an adjusting seat, an adjusting sleeve, a guide rod and a clamping block in embodiment 2.

Wherein, 1, the indwelling device body; 101. a raised portion; 102. a shielding ring disc; 2. a guide seat; 201. a guide lumen; 202. a liquid outlet; 203. a partition plate; 3. a connecting pipe; 4. a clamping block; 401. a first tapered abutment surface; 402. a first outer table; 403. a second outer table; 404. a conical ring; 5. a guide bar; 501. a threaded segment; 502. a smoothing section; 503. a convex strip; 6. an adjustment sleeve; 601. an annular groove; 7. a limiting cylinder; 701. a horizontal ring plate; 702. mounting grooves; 703. connecting holes; 704. a ball bearing; 705. a compression spring; 8. an adjusting seat; 9. a locking assembly; 901. an L-shaped locking member; 902. a containing groove; 903. an inner bore; 904. a fan-shaped opening; 905. a limiting sheet; 906. a compression spring; 10. an isolation plug; 11. a second tapered abutment surface; 12. an inner table-board; 13. sealing the groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The present embodiment discloses an arteriovenous vessel indwelling device, which comprises an indwelling device body 1 indwelling in a blood vessel and a catheter hub 2 integrally provided with the indwelling device body 1, as shown in fig. 1-2. The direction of the arrows in the figure is the direction of blood flow.

Specifically, the catheter base 2 is located on the outer side of the skin, a guide cavity 201 inside the catheter base 2 is communicated with an inner cavity of the indwelling device body 1, a liquid outlet 202 is formed in the side wall of the catheter base 2 and is communicated with the connecting pipe 3 through the liquid outlet 202, and an isolating plug 12 is arranged at the end of the connecting pipe 3. When hemodialysis is not performed, the isolating plug 12 is arranged at the free end of the connecting pipe 3, so that the connecting pipe 3 is prevented from being blocked, and the pollution to the internal environment of the connecting pipe 3 is avoided.

As shown in fig. 1, the indwelling device body 1 is embedded in a blood vessel along the blood flowing direction, and anticoagulant materials placed in the body for a long time can be adopted, for example, a PICC tube is used, and the PICC tube is immersed in a solution containing zwitterionic polymer sulfobetaine (PolySB) for reaction for at least 16h, so that the inner surface and the outer surface of the PICC are modified, and the indwelling device with the anticoagulant function is finally obtained. In this embodiment, the indwelling tube body and the catheter hub outer wall may be made of the same material, and may be integrally formed, and the anticoagulation coating treatment may be performed in the same manner.

The middle position of the indwelling device body is provided with a bulge part which can realize the purpose of expanding blood vessels, the condition that the indwelling device body moves in the blood vessels is avoided, and blood flows along the length direction of the indwelling device body 1 in the inner cavity of the indwelling device body 1. The bulge 101 is provided with an opening, the opening is communicated with a guide cavity 201 inside the catheter base 2, and a shielding ring plate 102 is arranged at the opening. The outer wall of the shielding disc and the inner wall of the bulge are integrally formed, the area of the fixture block is 2/3 of the area of the shielding disc, the inner wall of an inner channel formed by the fixture block, the shielding disc and the bulge in a surrounding mode is smooth and has no shielding, and the smoothness of blood circulation is guaranteed. When the latch moves away from the shielding disc, the shielding disc can shield about 1/3 blood from flowing out of the indwelling tube.

As shown in fig. 3, a partition plate 203 is disposed in the guide cavity 201, the partition plate 203 is located above the liquid outlet 202, an adjusting sleeve 6 is disposed above the partition plate 203, a guide rod 5 is connected to the inner portion of the adjusting sleeve 6 through a thread, a lower end of the guide rod 5 penetrates through a through hole in the partition plate 203 and enters an inner cavity of the indwelling device body 1, a fixture block 4 is fixedly connected to an end portion of the guide rod 5, the fixture block 4 can seal an inner ring of the shielding ring plate 102, an upper end of the adjusting sleeve 6 is fixedly connected to an adjusting seat 8, and the adjusting seat 8 is located above the catheter seat 2 and seals a port of the catheter seat 2. The guide rod 5 comprises a thread section 501 and a smooth section 502, the thread section 501 is arranged inside the displacement adjusting sleeve 6, the diameter of the thread section 501 is larger than that of the smooth section 502, convex strips 503 which are symmetrical to each other are arranged on the periphery of the smooth section 502, sliding grooves (not shown in the figure) which are matched with the convex strips 503 are arranged on the inner wall of the through hole, and the sliding grooves penetrate through the upper end surface and the lower end surface of the inner wall. When the adjusting seat 8 is rotated, the adjusting sleeve 6 rotates along with the adjusting seat 8, the guide rod 5 vertically moves along with the rotation of the adjusting sleeve 6, and the smooth section 502 is clamped with the sliding groove in the partition plate 203 through the convex strip 503, so that the guide rod 5 is prevented from rotating along with the adjusting sleeve 6.

The adjusting seat 8 is rotated, so that the guide rod 5 is guided to move up and down, the relative position of the clamping block 4 is changed, the clamping block 4 is matched with the shielding disc 102 to be used for conducting and closing the circulation of blood in the indwelling device, the phenomenon that a puncture needle tube repeatedly punctures a blood vessel is avoided, the whole device is good in sealing performance, and when hemodialysis is not needed, the outer wall of the clamping block 4 is tightly attached to the inner annular wall of the shielding disc 102, so that the blood in the indwelling device is prevented from flowing into the inner cavity of the guide seat to cause pollution; when the blood connection tube is communicated with the artery connection tube, the guide rod 5 moves upwards, the fixture block 4 moves upwards along with the guide rod, the upper end of the fixture block abuts against the lower end face of the partition plate 203, the through hole in the partition plate 203 is sealed, and blood enters the connection tube 3 along the guide cavity 201 and flows into the artery connection tube.

As shown in fig. 1, 2, 6, and 7, the upper end surface of the partition 203 is provided with a limiting cylinder 7 around the outer side of the adjusting sleeve 6, the upper end of the limiting cylinder 7 is provided with a horizontal ring plate 701 along the circumferential direction thereof, the outer wall of the adjusting sleeve 6 is provided with an annular groove 601, the horizontal ring plate 701 is located in the annular groove 601, and a buffer assembly is arranged between the horizontal ring plate 701 and the upper and lower walls of the annular groove 601. The buffering assembly comprises an extrusion spring 705 and a ball 704, the upper end surface and the lower end surface of the horizontal annular plate 701 are both provided with a plurality of mutually symmetrical installation grooves 702 at equal intervals along the circumferential direction, a connecting hole 703 is formed between the upper installation groove 702 and the lower installation groove 702 which are mutually symmetrical, the compression spring 705 is installed in the installation groove 703, the part of the compression spring 705 is positioned in the connecting hole 703, and the compression spring 7056 is positioned in the connecting hole 703 and is sleeved on the outer side of the part of the ball 704 positioned in the connecting hole 703.

In this embodiment, the horizontal ring plate 701 of the limiting cylinder 7 is clamped in the annular groove 601 of the adjusting sleeve 6 to seal and limit the adjusting sleeve 6, so as to prevent the adjusting sleeve 6 from moving up and down or deviating at will and prevent blood in the indwelling device body 1 from oozing out. Secondly, a relatively smooth sliding of the adjustment sleeve 6 and the horizontal ring plate 701 is achieved by the damping assembly.

In order to avoid the adjustment socket 8 from rotating under the action of external force, as shown in figures 4 and 5, a locking assembly 9 is provided between said adjustment socket 8 and the catheter hub 2, the locking assembly 9 comprises an L-shaped locking piece 901, a support is arranged on the outer wall of the upper end of the conduit seat 2, the vertical part of the L-shaped locking piece 901 penetrates through the support, the end of the vertical part of the L-shaped locking element 901 is mushroom head structure, the lower end surface of the adjusting seat 8 is provided with at least two accommodating grooves 902 with downward openings, inner holes 903 are respectively arranged on two symmetrical side walls of the containing groove 902, the two inner holes 903 are respectively communicated with the containing groove 902 through a fan-shaped opening 904, limiting pieces 905 are respectively arranged in the two inner holes 903, the middle portion of the retaining tab 905 extends through the fan-shaped opening 904 and is bent into the slot 902 to form a protrusion, after the L-shaped locking piece 901 is inserted into the receiving groove 902, the protrusion is clamped below the mushroom head structure.

The interior bottom of hole 903 still is provided with a plurality of extrusion spring 906, a plurality of extrusion spring 906's upper end all is connected with the lower extreme of spacing piece 905, a plurality of extrusion spring 906's lower extreme all with the interior bottom fixed connection of hole 903, a plurality of extrusion spring 906 distribute along the equidistant of width direction of spacing piece 905. The limiting plate 905 may be a steel plate with elastic characteristics.

When need not carry out hemodialysis, rotation regulation seat 8, it is rotatory to drive adjusting sleeve 6, because guide bar 5 and 6 internal thread of adjusting sleeve are connected, then drive guide bar 5 downstream, fixture block 4 closely laminates with sheltering from disc 102, then upwards push away L type latch fitting 901, mushroom head structure enters into storage tank 902 in, extrude spacing piece 905 earlier, make spacing piece 905's bulge adduction, spacing piece 905's lower extreme extrusion spring 906 moves down, treat that mushroom head structure enters into storage tank 902's interior upper portion completely after, spacing piece 905 realizes the bellying extrusion of formation that resets under extrusion spring 906's effect below mushroom head structure, prescribe a limit to mushroom head structure, avoid adjusting seat 8 and rotate under the exogenic action. When the blood vessel is communicated with the artery connecting pipe, the guide rod 5 moves upwards, the fixture block 4 moves upwards along with the guide rod, the upper end of the fixture block 4 abuts against the lower end face of the partition plate, the through hole in the partition plate is sealed, and approximately 2/3 blood enters the connecting pipe 3 along the guide cavity 201 and flows into the artery connecting pipe. The L-shaped locking piece is pushed upwards in the same way, the mushroom head structure is limited in the containing groove, and the adjusting seat is prevented from rotating under the action of external force.

When the indwelling device is used, firstly, the skin of a patient is disinfected, the skin is cut to find a target artery, the artery is clamped by the hemostatic forceps, the artery is cut or a small opening is cut at the far-end by using a scalpel or surgical scissors, then, the indwelling device body 1 is implanted into the artery, the catheter seat 2 and the connecting pipe 3 are exposed outside the skin, the artery and the skin are sutured, and the implantation of the indwelling device is completed. When needing to carry out hemodialysis to the patient, on being connected to the indwelling device with the artery takeover, rotation regulation seat 8 drives guide bar 5 and upwards removes, and fixture block 4 moves up along with the guide bar, and its upper end supports baffle lower extreme face, seals the perforation on the baffle, improves the blood flow direction in the inner chamber of indwelling device body 1, and blood gets into connecting pipe 3 along the direction chamber way, flows to in the artery takeover, alright begin hemodialysis. Whole device easy operation, the security is high, has avoided the drawback of traditional puncture repeatedly.

Example 2

On the basis of the structure disclosed in embodiment 1, the structure of the blocking block and the matched blocking ring disc is improved:

as shown in fig. 8, 9, and 10, in this embodiment, the outer sidewall of the fixture block is sequentially provided with a first tapered abutment surface, a first outer mesa, and a second outer mesa from bottom to top, the outer wall of the second outer mesa is further provided with a tapered ring along the circumferential direction thereof, the tapered ring has the same height as the second outer mesa, the inner annular wall of the shielding ring disk is sequentially provided with a second tapered abutment surface and an inner mesa from bottom to top, and the top wall of the shielding ring disk is provided with a sealing groove matched with the tapered ring. When the clamping block is embedded into the shielding ring disc, the first conical abutting surface is abutted to the second conical abutting surface, the first outer table surface is attached to the inner table surface, the second outer table surface is attached to the top wall of the shielding ring disc, and the cone ring is limited in the sealing groove. The clamping block and the shielding ring disc are sealed by utilizing the interaction of the first conical abutting surface and the second conical abutting surface, the first outer table surface and the inner table surface, the second outer table surface and the top wall of the shielding ring disc and the cone ring limited in the sealing groove. So far, the sealed effect of fixture block and the junction of sheltering from the ring dish is better, and the goodness of fit is higher to guarantee that the fixture block diapire and the contact part of sheltering from the ring dish diapire are smooth level and smooth, make the uplift inner wall of the intermediate position of keeping somewhere the ware body smooth without the hindrance.

When the indwelling device is used, firstly, the skin of a patient is disinfected, the skin is cut to find a target artery, the artery is clamped by the hemostatic forceps, the artery is cut or a small opening is cut at the far-end by using a scalpel or surgical scissors, then, the indwelling device body 1 is implanted into the artery, the catheter seat 2 and the connecting pipe 3 are exposed outside the skin, the artery and the skin are sutured, and the implantation of the indwelling device is completed. When needing to carry out hemodialysis to the patient, on being connected to the indwelling device with the artery takeover, rotation regulation seat 8 drives guide bar 5 and upwards removes, and fixture block 4 moves up along with the guide bar, and its upper end supports baffle lower extreme face, seals the perforation on the baffle, improves the blood flow direction in the inner chamber of indwelling device body 1, and blood gets into connecting pipe 3 along the direction chamber way, flows to in the artery takeover, alright begin hemodialysis. After the dialysis, then the regulation seat of reverse direction rotation 8, musical instrument sound guide bar downstream, the fixture block moves down along with the guide bar, when the fixture block embedding shelters from the ring dish when inside, first toper abutment surface adjoins on second toper abutment surface, realize well coincide, first outer mesa laminating is on the mesa including, the laminating of the outer mesa of second is on the roof that shelters from the ring dish, and the cone ring is spacing in the seal groove, the fixture block realizes well sealedly with sheltering from the ring dish, thereby guarantee that the fixture block diapire and shelter from the smooth level and smooth of ring dish diapire contact segment, make the uplift inner wall of the intermediate position of keeping somewhere the ware body smooth nothing of unblock.

The structures related to the above embodiments all adopt medical materials with anticoagulation effect, wherein the structures of the indwelling device body 1, the guide rod 5, the fixture block 4, the partition plate 203, the adjusting sleeve 6, the adjusting seat 8, the shielding ring disc and the like can all adopt metal materials (titanium alloy materials, medical stent materials), medical high polymer materials and the like, and the connecting pipe can adopt polytetrafluoroethylene pipes or e-PTFE artificial blood vessels and the like besides the above metals and medical high polymer materials with good anticoagulation effect.

The method of operation of the venous vascular placement tube is similar to that described above for the artery and will not be described in detail here.

The arteriovenous vessel indwelling device of the present invention can be used for constructing an allogeneic cocycle model for medical research, in addition to the hemodialysis described above.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way, particularly to a joint design where the sidewalls have both an entrance and an exit. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.