阅读说明：本技术 一种导丝座及导管导丝系统 (Wire guide seat and catheter wire guide system ) 是由 黎海鹏 刘浩 于 2021-09-07 设计创作，主要内容包括：本发明涉及一种导丝座及导管导丝系统,其中导丝座包括从前往后依次连接的手柄前段、手柄后段和盖帽,手柄前段的前端设有用于与导管座连接的第一接头、中部设有与注射器连接的第二接头、后端设有第一螺纹部和第一定位部,手柄后段的前端开设有沿轴向从前往后直径逐层减小的第一环状阶梯槽,第一环状阶梯槽中部设有与第一螺纹部配合的第一内螺纹、后部装入有可受第一定位部挤压而夹紧导丝并密封的密封圈,手柄前段、手柄后段、盖帽及密封圈在中心轴线处均对应设有供导丝贯穿通过的通道。优点为,方便冲洗浸润导管内表面及导丝外表面,简化手术操作；两段螺纹拧紧结构,分别起密封及夹紧作用,保证液体不外漏且方便对导丝调节及定位。(The invention relates to a guide wire seat and a catheter guide wire system, wherein the guide wire seat comprises a handle front section, a handle rear section and a cover cap which are sequentially connected from front to back, the front end of the handle front section is provided with a first connector used for being connected with a catheter seat, the middle part of the handle front section is provided with a second connector connected with an injector, the rear end of the handle rear section is provided with a first threaded part and a first positioning part, the front end of the handle rear section is provided with a first annular stepped groove with the diameter gradually reduced from front to back along the axial direction, the middle part of the first annular stepped groove is provided with a first internal thread matched with the first threaded part, the rear part of the first annular stepped groove is provided with a sealing ring which can be squeezed by the first positioning part to clamp a guide wire and seal, and the handle front section, the handle rear section, the cover cap and the sealing ring are correspondingly provided with channels for the guide wire to pass through at the central axis. Has the advantages that the inner surface of the infiltration catheter and the outer surface of the guide wire are convenient to wash and infiltrate, and the operation is simplified; two sections of screw thread tightening structures play a role in sealing and clamping respectively, ensure that liquid does not leak outwards and are convenient to adjust and position the guide wire.)

1. The utility model provides a yarn guide seat, a serial communication port, include handle anterior segment (1), handle back end (2) and block (3) that connect gradually backward in the past, the front end of handle anterior segment (1) is equipped with first joint (4) that are used for being connected with pipe seat (300), middle part is equipped with second joint (5) of being connected with syringe (400), the rear end is equipped with first screw thread portion (6) and first positioning portion (7), the first cyclic annular ladder groove that diameter successive layer reduces is seted up along the axial in the past to the front end of handle back end (2), first cyclic annular ladder groove middle part be equipped with first screw thread portion (6) complex first internal thread (8), rear portion are packed into and can receive first positioning portion (7) extrusion and press from both sides tight seal ring (9) of tight seal wire (100), handle anterior segment (1), handle back end (2), block (3) and seal ring (9) all correspond in the central axis department and are equipped with the logical that confession seal wire (100) run through And (4) carrying out the following steps.

2. A guide wire holder according to claim 1, characterized in that the seal ring (9) is provided with a cylindrical center of the channel, the front end face and the rear end face of the channel are provided with positioning ring pieces (14) protruding from the end faces, and the rear end face of the first positioning portion (7) and the groove bottom of the rear end of the first annular stepped groove are respectively provided with an annular groove (15) correspondingly matched with the positioning ring pieces (14).

3. A guide wire holder according to claim 1, characterized in that, the first location portion (7) is located behind the first screw thread portion (6), the first annular step groove is first annular groove, second annular groove and third annular groove from the past backward in proper order, first annular groove inner wall is equipped with first ring buckle (16) near the front end opening part, the front end of first screw thread portion (6) with the first spacing lug of first ring buckle (16) complex, first internal thread (8) are located on the inner wall of second annular groove, sealing washer (9) are located in the third annular groove.

4. The guide wire seat according to claim 1, characterized in that, the rear end of handle back end (2) is equipped with second screw thread portion (10) and second location portion (11), the annular ladder groove of second that diameter layer-by-layer reduces from the past backward along the axial is seted up to the front end of block (3), the annular ladder groove middle part of second be equipped with second screw thread portion (10) complex second internal thread (12), rear portion are provided with can extrude second location portion (11) are with the conical cylinder section (13) that presss from both sides tight location to guide wire (100).

5. A guide wire holder according to claim 4, characterized in that the second positioning portion (11) is an elastomer body provided with the passage at the center, the elastomer body is a cone body integrally matched with the conical cylinder section (13), and the elastomer body is composed of a plurality of elastic claw sheets.

6. A guide wire holder according to claim 4, characterized in that, second location portion (11) is located the second screw thread portion (10) rear, the second annular ladder groove is annular first, annular second and circular cone groove from the past backward in proper order, an inner wall of annular is close to the front end opening part and is equipped with second annular buckle (17), the front end of second screw thread portion (10) with the spacing lug of second annular buckle (17) complex second, second internal thread (12) are located on the inner wall of annular second, second location portion (11) stretches into in the circular cone groove.

7. A guide wire holder according to claim 6, characterized in that the conical top of the conical groove extends backwards to a position close to the rear end face of the cap (3), and the rear end face of the cap (3) is centrally provided with an end hole (18) communicated with the conical top of the conical groove.

8. A guide wire holder according to any one of claims 1 to 7, characterized in that the diameter of the channel in the front and middle of the front handle section (1) is larger than the diameter of the first thread section and the channel of the first positioning section (7) on the rear side, and the outer walls of the rear handle section (2) and the cap (3) are provided with anti-slip threads (19).

9. A guide wire holder according to any one of claims 1 to 7, characterized in that the first connector (4) is a female luer connector, the second connector (5) is a male luer connector, the sealing ring (9) is made of silicone or TPU elastomer, and the front handle section (1), the rear handle section (2) and the cap (3) are made of polyoxymethylene.

10. A catheter guidewire system, comprising a guidewire (100), a catheter (200), a catheter hub (300), a syringe (400) and the guidewire hub (500) of any of claims 1 to 9, wherein the catheter (200) is connected to the front end of the catheter hub (300), wherein the rear end of the catheter hub (300) is connected to the guidewire hub (500) at a first joint (4), wherein the syringe (400) is connected to a second joint (5), and wherein the guidewire (100) extends through the catheter (200), the catheter hub (300) and the guidewire hub (500) from front to back.

Technical Field

The invention relates to the field of medical instruments, in particular to a guide wire seat and a catheter guide wire system.

Background

With the development of interventional procedures in recent years, medical devices related to interventional therapy, such as microcatheters, micro guide wires, etc., play an active role in the surgical procedure. A microcatheter system consisting of a microcatheter and a microcatheter is guided by a medical imaging device, the microcatheter system is carefully advanced through the guiding catheter until it reaches the desired site, the microcatheter is removed from the microcatheter, a small amount of contrast agent is slowly injected into the microcatheter, and the patient is treated by high resolution fluoroscopy and digital subtraction angiography monitor (DSA to verify that the medium flows out of the tip of the catheter, introducing embolic material or other agents.

In the current interventional operation, the micro catheter and the micro guide wire need to be matched for use, in the preparation work before the operation is started, heparinized normal saline needs to be adopted to perform infiltration on the surfaces of the micro catheter and the micro guide wire, and the hydrophilic coating on the surfaces of the micro catheter and the micro guide wire is utilized to reduce the friction force on the surfaces and protect the micro catheter and the micro guide wire from being damaged.

In the prior art, the control of the micro-guide wire is mainly as follows:

1) the wire twisting controller: the guide wire penetrates into the guide wire twisting controller, after the guide wire twisting controller is screwed down, the guide wire and the guide wire twisting controller cannot move relatively, and two ends of the guide wire twisting controller cannot be connected with the micro-catheter seat and the injector;

2) guide wire stopper and guide wire seat: the Teerfeng microcatheter adopts a guide wire retainer and a guide wire seat, the guide wire seat and the guide wire are fixed together through bonding, one end of the guide wire seat can be connected with the catheter seat of the microcatheter through threads, the other end of the guide wire seat is a Ruhr joint which can be connected with an injector, and heparinized normal saline is directly injected to infiltrate the microcatheter and the microcatheter. In addition, the length of the micro guide wire extending out of the micro catheter is controlled by a stopper; the cooperation of two pieces is needed, so that the operation is complicated when a doctor uses the medical instrument.

3) Epert wire guide: the Epit micro-catheter integrates the stopper and the guide wire seat, the micro-guide wire can freely pass through the guide wire seat, the stopper and the guide wire seat are fixed by a clamping head at one end of the guide wire seat, the other end of the guide wire seat is connected with the micro-catheter seat, and the end of the clamping head can be connected with an injector to inject heparinized physiological saline. When the heparinized saline is injected, the guide wire and the guide wire seat cannot be fixed and can slide relatively, so that the guide wire risks sliding in the microcatheter when the injection pressure is too high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a guide wire seat and a catheter guide wire system, and aims to solve the following problems in the prior art: when the existing guide wire seat is used for injecting heparinized physiological saline, the guide wire and the guide wire seat cannot be fixed and can slide relatively, so that the guide wire has the risk of sliding in the microcatheter when the injection pressure is overlarge, and the guide wire can slide out of the microcatheter completely in serious cases; and the sealing performance of the existing guide wire seat cannot be ensured, and the problems of liquid leakage and the like can occur when the physiological saline is injected.

The technical scheme for solving the technical problems is as follows: the utility model provides a yarn guide seat, its includes handle anterior segment, handle back end and the block that connect gradually backward in the past, the front end of handle anterior segment is equipped with the first joint that is used for being connected with the pipe seat, the middle part is equipped with the second that is connected with the syringe and connects, the rear end is equipped with first screw thread portion and first positioning portion, the first cyclic annular ladder groove that diameter successive layer reduces backward in the past along the axial is seted up to the front end of handle back end, first cyclic annular ladder groove middle part be equipped with first screw thread portion complex first internal thread, rear portion are packed into and are had can receive first positioning portion extrusion and press from both sides tight seal wire and sealed sealing washer, handle anterior segment, handle back end, block and sealing washer all correspond in central axis department and are equipped with the passageway that supplies the seal wire to run through.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the sealing washer is equipped with for the center cylindric and preceding terminal surface and the rear end face of passageway all are equipped with the retainer ring piece of protrusion in the terminal surface, the rear end terminal surface of first locating part reaches the tank bottom department of first cyclic annular ladder groove rear end is equipped with respectively with the ring channel that the retainer ring piece corresponds the matching.

Adopt above-mentioned further institutional advancement's benefit to be convenient for the sealing washer at the inside installation and the location of handle back end, make the sealing washer keep with the coaxial state of handle anterior segment and the back end of guide wire seat, avoid the sealing washer to take place to overturn the dislocation in the handle back end.

Further, state first positioning portion and be located the rear of first screw thread portion, first cyclic annular ladder groove is first annular, second annular and third annular in the past backward in proper order, first annular inner wall is close to the front end opening part and is equipped with first cyclic annular buckle, the front end of first screw thread portion with first cyclic annular buckle complex first spacing lug, first internal thread is located on the inner wall of second annular, the sealing washer is located in the third annular.

Adopt above-mentioned further institutional advancement's benefit to be, handle anterior segment and back end connection back, through the cooperation of first cyclic annular buckle and first spacing lug, can effectively avoid first screw portion and first internal thread to unscrew excessively and the pine takes off.

Further, the rear end of handle back end is equipped with second screw thread portion and second location portion, the annular ladder groove of second that reduces along the axial from the past backward diameter successive layer is seted up to the front end of block, the annular ladder groove middle part of second be equipped with second screw thread portion complex second internal thread, rear portion are provided with can extrude second location portion is in order to press from both sides the cone section of tight location to the seal wire.

Adopt above-mentioned further institutional advancement's benefit to be, through the cooperation of second location portion and conical cylinder section, can carry out the secondary to the seal wire and press from both sides tight location and seal, the effect is better.

Further, the second positioning part is an elastic body with the channel arranged at the center, the elastic body is integrally a conical body matched with the conical cylinder section, and the elastic body is composed of a plurality of elastic claw pieces.

Adopt above-mentioned further institutional advancement's benefit to be, simple structure can effectively fix a position the seal wire.

Further, second location portion is located second screw thread portion rear, the annular first, annular second and circular cone groove are in proper order backward in the past in the annular ladder groove, an annular inner wall is close to the front end opening part and is equipped with the annular buckle of second, the front end of second screw thread portion with the spacing lug of the annular buckle complex second of second, the second internal thread is located on the inner wall of annular second, second location portion stretches into in the circular cone groove.

Adopt above-mentioned further institutional advancement's benefit to be, handle back end and block connection back, through the cooperation of first cyclic annular buckle and first spacing lug, can effectively avoid first screw portion and first internal thread to unscrew excessively and the pine takes off.

Furthermore, the top of the cone groove extends backwards to a position close to the rear end face of the cap, and the center of the rear end face of the cap is provided with an end hole communicated with the top of the cone groove.

Adopt above-mentioned further institutional advancement's benefit to be, the end hole is the passageway of block, reduces the block and sets up the length of passageway, the processing of being convenient for.

Furthermore, the diameters of the channels positioned at the front end and the middle part in the front section of the handle are larger than the diameters of the first thread section positioned at the rear side and the channel positioned at the first positioning part, and anti-skid threads are arranged on the outer walls of the rear section of the handle and the outer wall of the cap.

The advantage of adopting above-mentioned further structural improvement is that, the passageway that corresponds in the handle anterior segment is thicker, then the clearance between seal wire and the passageway is a little relatively, is convenient for to the infiltration of passageway inner wall and seal wire outer wall.

Further, the first joint is luer connector, the second connects for luer connector outward, the material of sealing washer is silica gel or TPU elastomer, the material of handle anterior segment, handle back end and block is polyformaldehyde.

Adopt above-mentioned further institutional advancement's benefit to do, luer connects convenient and the leakproofness is good, the difficult weeping condition that appears.

The invention also provides a catheter guidewire system comprising a guidewire, a catheter hub, a syringe and the guidewire hub of any one of claims 1 to 9, the catheter being connected to the catheter hub at a front end thereof, the catheter hub being connected at a rear end thereof to a first junction of the guidewire hub, the syringe being connected at a second junction, the guidewire extending from front to rear through the catheter, the catheter hub and the guidewire hub.

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

1) the middle part of the front handle section of the guide wire seat is provided with a second joint for connecting an injector, heparinized saline is injected into a channel of the guide wire seat through the injector, a sealing ring is arranged in the rear handle section, when the front handle section is connected with the rear handle section and screwed, the sealing ring can be squeezed by the first positioning part to be contracted to compress the guide wire, on one hand, the channel of the rear handle section is cut off and sealed at the sealing ring to prevent the heparinized saline from flowing into the cap side to be leaked, and on the other hand, the guide wire is clamped and positioned to prevent the guide wire from displacing in the catheter due to overlarge pressure when the heparin saline is injected; after the injection of the heparin normal saline is finished, the connection between the front section of the handle and the rear section of the handle is unscrewed, the extrusion on the sealing ring is released, the sealing ring releases the guide wire, and the guide wire can move back and forth to adjust the length of the guide wire extending out of the catheter, so that the use is convenient.

2) The rear end of the handle rear section of the guide wire seat is also provided with a second positioning part, when the handle rear section is screwed with the cover cap, the second positioning part is extruded and contracted by the conical cylinder section to clamp the guide wire, the guide wire positioning effect is mainly played, and meanwhile, the guide wire positioning effect and the sealing effect are played in cooperation with the first positioning part and the sealing ring, so that the leakage prevention and displacement prevention effects are better.

3) The guide wire seat and the guide wire system of the catheter can more conveniently use heparinized physiological saline to infiltrate the inner wall of the catheter and the surface of the guide wire, can randomly adjust the length of the guide wire extending out of the tip end of the catheter and stably position the guide wire, and simultaneously have good sealing effect; the device provided by the invention is mainly used for washing and infiltrating before the operation of a catheter and a guide wire system, has the effects of reducing friction force, preventing wrinkles and abrasion of a hydrophilic coating, and is convenient for twisting control operation of the guide wire in the operation.

Drawings

FIG. 1 is a front view of a guidewire holder provided by the present invention;

FIG. 2 is a cross-sectional view of the guidewire housing of FIG. 1;

FIG. 3 is a front view of the forward section of the guidewire hub handle of FIG. 1;

FIG. 4 is a cross-sectional view of the forward section of the handle of FIG. 3;

FIG. 5 is a front view of a rear section of the guidewire hub handle of FIG. 1;

FIG. 6 is a cross-sectional view of the rear section of the handle of FIG. 5;

FIG. 7 is a front view of the guidewire housing cap of FIG. 1;

FIG. 8 is a cross-sectional view of the cap shown in FIG. 7;

FIG. 9 is a cross-sectional view of the seal ring in the guidewire housing of FIG. 2 taken along the axial direction;

FIG. 10 is a front view of a catheter guidewire system provided by the present invention;

FIG. 11 is an isometric view of the catheter hub of FIG. 10 after attachment of the guidewire hub;

FIG. 12 is a cross-sectional view of the catheter hub and guidewire hub of FIG. 11 after attachment.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a front section of the handle; 2. a handle rear section; 3. capping; 4. a first joint; 5. a second joint; 6. a first threaded portion; 7. a first positioning portion; 8. a first internal thread; 9. a seal ring; 10. a second threaded portion; 11. a second positioning portion; 12. a second internal thread; 13. a conical cylinder section; 14. positioning the ring sheet; 15. an annular groove; 16. a first annular buckle; 17. a second annular buckle; 18. an end hole; 19. anti-skid lines; 100. a guide wire; 200. a conduit; 300 a catheter hub; 400. an injector; 500. a thread guide seat.

Detailed Description

The principles and features of this invention are described in connection with the drawings and the detailed description of the invention, which are set forth below as examples to illustrate the invention and not to limit the scope of the invention.

In the description of the present invention, if terms indicating orientation such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., are used, they indicate orientation or positional relationship based on that shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 9, the present invention provides a guide wire holder, which comprises a front handle section 1, a rear handle section 2 and a cap 3 connected in sequence from front to back, the front end of the handle front section 1 is provided with a first joint 4 for connecting with a catheter seat 300, the middle part is provided with a second joint 5 for connecting with an injector 400, the rear end is provided with a first thread part 6 and a first positioning part 7, the front end of the handle rear section 2 is provided with a first annular stepped groove with the diameter gradually reduced from front to back along the axial direction, a first internal thread 8 matched with the first thread part 6 is arranged in the middle of the first annular stepped groove, a sealing ring 9 which can be squeezed by the first positioning part 7 to clamp the guide wire 100 and seal is arranged at the rear part of the first annular stepped groove, the handle front section 1, the handle rear section 2, the cap 3 and the sealing ring 9 are all correspondingly provided with a channel for the guide wire 100 to penetrate through at the central axis.

The first thread part is matched with the first internal thread, and when the first positioning part is screwed, one end of the sealing ring is pressed tightly by the first positioning part and is extruded, so that a central channel of the sealing ring is reduced and is tightly attached to the guide wire, the function of blocking the channel is realized, and the guide wire can be positioned to a certain degree; when the guide wire is required to move in the guide wire seat so as to adjust the length of the guide wire penetrating out of the catheter, the first positioning part can be unscrewed to release the compression of the sealing ring.

In an embodiment of the present invention, as shown in fig. 9, the sealing ring 9 is cylindrical, the passage is arranged in the center, the front end face and the rear end face of the sealing ring are both provided with positioning ring pieces 14 protruding from the end faces, and annular grooves 15 corresponding to the positioning ring pieces 14 are respectively arranged at the rear end face of the first positioning portion 7 and the groove bottom of the rear end of the first annular stepped groove.

It should be noted that, the positioning ring piece at the rear end of the sealing ring is inserted into the annular groove at the rear section groove bottom of the handle, and the positioning ring piece at the front end of the sealing ring is sleeved on the annular groove at the front end of the first positioning part.

In an embodiment of the present invention, as shown in fig. 3 and 4, the first positioning portion 7 is located behind the first threaded portion 6, the first annular stepped groove is sequentially a first annular groove, a second annular groove and a third annular groove from front to back, a first annular snap 16 is disposed on an inner wall of the first annular groove near an opening of a front end, a first limit protrusion is disposed at a front end of the first threaded portion 6 and engaged with the first annular snap 16, the first internal thread 8 is disposed on an inner wall of the second annular groove, and the sealing ring 9 is located in the third annular groove.

In an embodiment of the present invention, as shown in fig. 5 and 6, a second threaded portion 10 and a second positioning portion 11 are provided at the rear end of the handle rear section 2, a second annular stepped groove whose diameter decreases layer by layer from front to back along the axial direction is provided at the front end of the cap 3, a second internal thread 12 which is engaged with the second threaded portion 10 is provided in the middle of the second annular stepped groove, and a conical barrel section 13 which can press the second positioning portion 11 to clamp and position the guide wire 100 is provided at the rear portion of the second annular stepped groove.

It should be noted that, the two sections of thread tightening structures (the first thread portion and the first internal thread, and the second thread portion and the second internal thread) respectively play a role in sealing and clamping, so that liquid cannot leak out, the micro guide wire and the guide wire seat cannot move relative to each other after being locked, and the micro guide wire cannot slide when a doctor pushes the micro guide wire in an operation.

In addition to the above embodiment, the second positioning portion 11 is an elastic body having the channel at the center, the elastic body is a cone-shaped body integrally matched with the conical cylinder section 13, and the elastic body is composed of a plurality of elastic claw pieces.

On the basis of above-mentioned embodiment, second location portion 11 is located second screw thread portion 10 rear, the annular first, annular second and circular cone groove are in proper order backward in the past in the annular step groove, an annular inner wall is close to the front end opening part and is equipped with the annular buckle 17 of second, the front end of second screw thread portion 10 with the spacing lug of the annular buckle 17 complex second of second, second internal thread 12 is located on the inner wall of annular second, second location portion 11 stretches into in the circular cone groove.

On the basis of the above embodiment, the vertex of the conical groove extends backwards to a position close to the rear end face of the cap 3, and the center of the rear end face of the cap 3 is provided with an end hole 18 communicated with the vertex of the conical groove.

In one embodiment of the present invention, the diameter of the channel in the front and middle of the front handle section 1 is larger than the diameter of the first thread section and the channel of the first positioning portion 7 on the rear side, and the outer walls of the rear handle section 2 and the cap 3 are provided with anti-slip threads 19.

In an embodiment of the present invention, the first connector 4 is a male luer connector, the second connector 5 is a female luer connector, the sealing ring 9 is made of a silicone rubber or a TPU elastomer, and the front handle section 1, the rear handle section 2, and the cap 3 are made of polyoxymethylene.

As shown in fig. 10 to 12, the present invention further provides a catheter guidewire system, which comprises a guidewire 100, a catheter 200, a catheter hub 300, a syringe 400 and a guidewire hub 500, wherein the catheter 200 is connected with the front end of the catheter hub 300, the rear end of the catheter hub 300 is connected with the first connector 4 of the guidewire hub 500, the syringe 400 is connected with the second connector 5, and the guidewire 100 penetrates through the catheter 200, the catheter hub 300 and the guidewire hub 500 from front to back.

Specifically, as shown in fig. 10, the guide wire 100 may be threaded through the catheter 200, the guide wire hub 500 and the catheter hub 300 may be threaded, and the guide wire hub and the syringe 400 may be threaded. When the injector is filled with normal saline, the threads between the front section of the handle of the guide wire seat and the rear section of the handle of the guide wire seat and between the rear section of the handle of the guide wire seat and the cap of the guide wire seat are locked, the guide wire seat and the catheter cannot move relatively, the normal saline flows into the micro catheter from the guide wire seat, a washing and infiltrating effect is performed on the surface of the guide wire and the inner surface of the catheter, the hydrophilic characteristics of the guide wire and the catheter are activated, the surface is smooth, the friction force is reduced, and the surface is protected from being damaged. And the physiological saline cannot leak to the outside from the guide wire seat due to the sealing function of the sealing ring.

It should be noted that, when the guide wire holder in the prior art injects heparinized saline from the head end, the clamping head must be released, and the guide wire holder cannot be fixed and can slide relatively, which causes the risk that the guide wire slides in the microcatheter when the injection pressure is too high, and in severe cases, the guide wire can slide out of the microcatheter entirely. And the sealing performance of the guide wire seat cannot be ensured, and the problem of liquid leakage can occur when the physiological saline is injected. When the catheter guide wire system provided by the invention is used for injecting heparinized normal saline, the micro guide wire and the guide wire seat are clamped and do not move relatively, and the sealing effect is better through extrusion sealing of the sealing ring.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.