Disposable medium-length catheter

Abstract

The invention relates to a disposable medium-length catheter. The disposable medium-length catheter comprises a puncture needle, a guide wire, a catheter body, a Y-shaped catheter base, an extension tube, a detachable shell and a guide wire connector. The end part of the catheter is communicated with a head interface of the Y-shaped catheter seat; the end part of the extension tube is communicated with a side interface of the Y-shaped catheter seat; one end of the puncture needle is inserted into the catheter, and the other end penetrates through a tail interface of the Y-shaped catheter seat and is fixedly connected with the lower cover; the other end of the guide wire is connected with one end of the guide wire joint; the guide wire connector and the Y-shaped catheter base slide in the axial direction of the detachable shell. The other end of the guide wire joint extends out of the detachable shell; the detachable shell comprises an upper cover body and a lower cover which are buckled up and down; an upper crevasse and a lower crevasse which are correspondingly spliced are respectively formed in the belly part of the upper cover body and the belly part of the lower cover; and a side interface of the Y-shaped catheter seat extends out from the space between the upper crevasse and the lower crevasse. The cumbersome degree of an implantation operation is reduced, the operation time is shortened, the operation burden is reduced, and operation can be conducted by a single person.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to a disposable medium-length catheter. Background Art

[0002] A medium-length catheter is a catheter that can be left in the body for a long time and replaces blood vessels for infusion. In general, a medium-length catheter needs to be surgically inserted by a doctor: the medium-length insertion process is: first puncture, then introduce the guide wire along the puncture needle, then pull out the puncture needle, introduce the catheter along the guide wire, and finally pull out the guide wire. During the medium-length insertion process, the doctor needs to operate the puncture needle, guide wire, and catheter, and the puncture needle, guide wire, and catheter are all separate parts, as disclosed in the utility model patent for improved medium-length catheter intravenous catheterization and device with authorization announcement number CN206453853U; when the doctor performs the surgical insertion of a medium-length catheter, a nurse is required to assist by handing over the puncture needle, guide wire, catheter, etc.; the surgical process is quite complicated and lasts a long time, which consumes the energy and physical strength of medical staff. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a disposable medium-length catheter.

[0004] The technical scheme of the present invention is: a disposable medium-length catheter, comprising a puncture needle, a guide wire, a catheter, a Y-shaped catheter seat, and an extension tube; the end of the catheter is connected to the head interface of the Y-shaped catheter seat and can move with the Y-shaped catheter seat; the end of the extension tube is connected to the side interface of the Y-shaped catheter seat and is used for infusion during intravenous injection; the medium-length catheter also includes a detachable shell and a guide wire connector; the detachable shell includes an upper cover body and a lower cover that are buckled up and down; the upper cover body and the lower cover form an integral body and wrap the Y-shaped catheter seat from the outside; at the same time, the buckling structure of the upper cover body and the lower cover can also be disassembled; the abdomen of the upper cover body and the abdomen of the lower cover are respectively provided with corresponding upper and lower ruptures; the upper ruptures and the lower ruptures are both in the shape of being narrow in front and wide in the back; the side interface of the Y-shaped catheter seat extends from between the upper rupture and the lower rupture, so that the doctor can push the Y-shaped catheter seat outside the detachable shell; one end of the puncture needle is inserted into the catheter and exceeds the outer end of the catheter, which can provide a certain degree of guidance for the movement of the catheter; the other end of the puncture needle passes through the Y-shaped catheter seat The tail interface is fixedly connected to the lower cover and can move with the movement of the lower cover; one end of the guide wire is inserted into the puncture needle and does not exceed the outer end of the puncture needle, thereby avoiding interference with the puncture of the puncture needle; the other end of the guide wire is connected to one end of the guide wire connector and can be moved with the guide wire connector as a power source; the guide wire connector and the Y-shaped catheter seat both slide axially along the detachable shell; when the guide wire connector slides axially forward, the guide wire can be extended forward to provide guidance for the extension of the catheter; when the Y-shaped catheter seat slides forward, the catheter can be extended forward and inserted into the vein; therefore, During the operation, the guidewire connector must slide forward before the Y-shaped catheter seat; the other end of the guidewire connector extends out of the detachable shell and is provided with an operating end to facilitate the doctor to push the guidewire connector outside the detachable shell; during the forward sliding of the Y-shaped catheter seat, the side interface of the Y-shaped catheter seat acts on the upper and lower ruptures to separate the upper cover body and the lower cover from top to bottom; after separation, the lower cover acts on the puncture needle, and the guidewire connector acts on the guidewire, which can be withdrawn from the inside of the Y-shaped catheter seat in sequence, thereby achieving the purpose of inserting a medium-length catheter.

[0005] Preferably, the upper cover body includes an upper cover and a buckle cover; when assembling the present invention, the guide wire and the guide wire connector are assembled last; the upper cover and the buckle cover are separated from each other, which can reduce the difficulty of the final assembly of the present invention; a buckle plate extends outward from the inner wall of the rear end of the upper cover; the head of the buckle cover cooperates with the buckle plate, which can improve the structural strength of the present invention when not in use, and also facilitates the upper cover to drive the rear lower cover to separate from the lower cover when the three-head joint acts on the upper and lower breaches.

[0006] Furthermore, an inward-facing U-shaped clip is provided at the rear end of the buckle plate, which can increase the area of ​​the upper cover acting on the buckle cover and improve the effect of the upper cover on the buckle cover; the guide wire passes through between the U-shaped clips; the U-shaped clip limits the guide wire to ensure the stability of the guide wire movement.

[0007] Furthermore, an extension strip extends from the rear end of the buckle plate; a buckle block is provided at the end of the extension strip; a buckle groove corresponding to the buckle strip is provided at the rear end of the lower cover; the side of the extension strip is slidably matched with the side of the guide wire connector; the side of the extension strip connected to the guide wire connector is lower in the front and higher in the back; when the guide wire connector is at the end of the extension strip, the buckle block cooperates with the buckle groove to limit the upper cover and the lower cover, thereby increasing the overall stability; when the guide wire connector slides forward, the buckle block disengages from the buckle groove, thereby reducing the difficulty of breaking the side interface of the Y-shaped catheter seat to disassemble the shell.

[0008] Preferably, the detachable shell also includes a keel; the back of the upper cover body and the back of the lower cover clamp the keel; insertion columns are symmetrically provided at the tail end of the keel; the upper cover body and the lower cover are correspondingly provided with insertion holes; the keel increases the structural stability of the detachable shell.

[0009] Preferably, the disposable medium-length catheter is also provided with a detachable joint; the detachable joint includes a buckle seat, a silicone sleeve, and an inner sleeve body which are sequentially mounted from the outside to the inside; the buckle seat is detachably connected to the tail interface of the Y-shaped catheter seat through a snap-fit ​​structure, and can be disconnected from the Y-shaped catheter seat after the side interface of the Y-shaped catheter seat acts on the upper and lower ruptures; the tail interface of the Y-shaped catheter seat is provided with a silicone pad; the tail of the inner sleeve body is provided with a silicone ring; the puncture needle passes through the center of the silicone ring, the center of the inner sleeve body, the center of the silicone sleeve, the center of the buckle seat, and the center of the silicone pad in sequence; the silicone ring, silicone sleeve, and silicone pad can be automatically sealed when the puncture needle is detached.

[0010] Preferably, both the upper cover head and the lower cover head are provided with double-layer partitions; the catheter passes through between the double-layer partitions; the double-layer partitions guide and limit the catheter to ensure that the catheter extends forward normally.

[0011] Furthermore, the tail end of the double-layer partition is provided with an arc chamfer corresponding to the head interface of the Y-shaped catheter seat; the head interface of the Y-shaped catheter seat can act on the arc chamfer to separate the upper cover body and the lower cover up and down.

[0012] Furthermore, an axial slide rail is provided on the belly of the keel; a slider which slidably cooperates with the axial slide rail is provided at the rear end of the inner sleeve; the slider cooperates with the axial slide rail to provide guidance for the forward movement of the Y-shaped catheter seat.

[0013] Preferably, a guide wire groove is provided at the end where the guide wire connector connects to the guide wire; the cross-section of the guide wire groove matches the guide wire, and the busbar is an arc shape; the end of the guide wire is fixedly connected to the upper cover body after passing through the guide wire groove; when the guide wire connector moves, the travel of the end of the guide wire is twice that of the guide wire connector, and the structure is more compact.

[0014] Furthermore, symmetrical protrusions are provided at the top of the rear end of the slider; triangular extrusion grooves are provided at the rear of the upper cover body and the rear of the lower cover; the extrusion groove is larger at the front and smaller at the rear; the protrusions cooperate with the extrusion grooves; the protrusions move forward to act on the extrusion grooves, thereby accelerating the separation speed of the upper cover body, the lower cover and the keel, and reducing the difficulty of breaking the side interface of the Y-shaped catheter seat to disassemble the shell.

[0015] The beneficial effects of the present invention are as follows: the disposable medium-length catheter of the present invention has the following advantages: (1) The present invention integrates the puncture needle, catheter and guide wire into one; the present invention reduces the complexity of the medium-length catheter insertion surgery, reduces the operation time, reduces the surgical burden, and can be performed by a single person; (2) The keel of the present invention increases the structural stability of the detachable shell; (3) The protrusions and the extrusion grooves of the present invention cooperate with each other to accelerate the separation speed of the upper cover body, the lower cover and the keel, and reduce the difficulty of breaking the side interface of the Y-shaped catheter seat to disassemble the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional disposable medium-length catheter of the present invention. Figure 1 ; Figure 2 It is a three-dimensional disposable medium-length catheter of the present invention. Figure 2 ; Figure 3 yes Figure 1 Axial cross-sectional view of Figure 4 yes Figure 3 I magnified view of; Figure 5 yes Figure 3 AA section view; Figure 6 is a three-dimensional diagram of the disposable medium-length catheter of the present invention after the buckle cover is removed; Figure 7 It is a three-dimensional diagram of the disposable medium-length catheter of the present invention after the buckle cover and the upper cover are removed; Figure 8 It is a three-dimensional picture of the buckle cover; Fig. 9 It is a three-dimensional picture of the upper cover; Fig.10 It is a three-dimensional image of the lower cover; Fig.11 It is a three-dimensional diagram of the disposable medium-length catheter of the present invention after the buckle cover, the upper cover and the lower cover are removed; Fig.12 It is a three-dimensional picture of the keel; Fig.13 It is a three-dimensional diagram of the disposable medium-length catheter of the present invention after the buckle cover, the upper cover, the lower cover and the keel are removed; Fig.14 is a stereoscopic diagram of a disposable medium-length catheter of the present invention in Embodiment 3; In the figure: 1. puncture needle, 2. guide wire, 3. catheter, 4. Y-type catheter seat, 41. head interface, 42. side interface, 43. tail interface, 44. silicone pad, 5. extension tube, 611. upper breach, 612. upper cover, 6121. buckle plate, 6122. U-shaped card, 6123. extension strip, 6124. buckle block, 613. buckle cover, 62. lower cover, 621. lower breach, 622. buckle groove, 623. guide wire guide seat, 6231. guide wire guide groove, 624. catheter mounting seat, 631. buckle nail , 632. button hole A, 633. button hole B, 634. button tooth B, 635. embedded tooth, 636. embedded groove, 64. keel, 641. inserted column, 642. fin plate, 643. axial slide rail, 65. inserted hole, 66. double-layer partition, 661. arc chamfer, 67. extrusion groove, 7. guide wire joint, 71. operating end, 72. guide wire groove, 8. detachable joint, 81. buckle seat, 82. silicone sleeve, 83. inner sleeve, 831. silicone ring, 832. slider, 8321. protrusion, 9. sheath. Implementation

[0017] Example 1: See Figure 1-13, a disposable medium-length catheter 3, comprising a puncture needle 1, a guide wire 2, a catheter 3, a Y-shaped catheter seat 4, and an extension tube 5; the end of the catheter 3 is connected to the head interface 41 of the Y-shaped catheter seat 4, and can move with the Y-shaped catheter seat 4; the end of the extension tube 5 is connected to the side interface 42 of the Y-shaped catheter seat 4, and is used for infusion during intravenous injection; the medium-length catheter 3 also includes a detachable shell and a guide wire connector 7; the detachable shell includes an upper cover 612 body and a lower cover 62 that are buckled together; the upper cover 612 body and the lower cover 62 form an integral body that wraps the Y-shaped catheter seat 4 from the outside; at the same time, the buckling structure of the upper cover 612 body and the lower cover 62 can also be disassembled; the buckling structure of the upper cover 612 body and the lower cover 62 includes a buckle set at the head of the upper cover 612 body The tooth nail 631, the button hole A 632 arranged at the head of the lower cover 62, the button hole B 633 arranged at the edge of the tail of the upper cover 612, the button tooth B 634 arranged at the edge of the tail of the lower cover 62, the embedded tooth 635 arranged at the edge of the upper cover 612, and the embedded groove 636 arranged at the edge of the lower cover 62; the button nail 631 and the button hole A 632 match each other; the button tooth B 634 and the button hole B 633 match each other; the embedded tooth 635 and the embedded groove 636 match each other; the upper cover 612 body abdomen and the lower cover 62 abdomen are respectively provided with corresponding upper breach 611 and lower breach 621; the upper breach 611 and the lower breach 621 are both in the shape of being narrow in front and wide in the back; the side interface 42 of the Y-shaped catheter seat 4 extends from between the upper breach 611 and the lower breach 621 to It is convenient for the doctor to push the Y-shaped catheter seat 4 outside the detachable shell; one end of the puncture needle 1 is inserted into the catheter 3 and exceeds the outer end of the catheter 3, which can provide a certain degree of guidance for the movement of the catheter 3; the other end of the puncture needle 1 passes through the tail interface 43 of the Y-shaped catheter seat 4, is fixedly connected with the lower cover 62, and can move with the movement of the lower cover 62; a catheter mounting seat 624 is provided at the tail of the lower cover 62; the end of the catheter 3 is embedded in the catheter mounting seat 624 to achieve fixed connection; one end of the guide wire 2 is inserted into the puncture needle 1, not exceeding the outer end of the puncture needle 1, so as to avoid interfering with the puncture of the puncture needle 1; the other end of the guide wire 2 is connected to one end of the guide wire connector 7, and can be moved with the guide wire connector 7 as the power source; the guide wire connector 7 and the Y-shaped catheter seat 4 both slide axially along the detachable shell; the guide wire connector 7 moves axially forward When the Y-shaped catheter seat 4 slides forward, the guide wire 2 can be extended forward to provide guidance for the extension of the catheter 3; when the Y-shaped catheter seat 4 slides forward, the catheter 3 can be extended forward and inserted into the vein; therefore, during the operation, the guide wire connector 7 must slide forward before the Y-shaped catheter seat 4 slides forward; the other end of the guide wire connector 7 extends out of the detachable shell, and is provided with an operating end 71, so that the doctor can push the guide wire connector 7 outside the detachable shell; during the forward sliding of the Y-shaped catheter seat 4, the side interface 42 of the Y-shaped catheter seat 4 acts on the upper breach 611 and the lower breach 621, so that the upper cover 612 and the lower cover 62 can be separated from each other; after separation, the lower cover 62 acts on the puncture needle 1, and the guide wire connector 7 acts on the guide wire 2, which can be sequentially drawn out from the inside of the Y-shaped catheter seat 4, thereby achieving the purpose of inserting a medium-length catheter 3.

[0018] Compared with the prior art, the present invention integrates the puncture needle 1, the catheter 3, and the guide wire 2 into one body, performs puncture through the puncture needle 1, and guides the catheter 3 into the vein; then pushes the guide wire connector 7 to make the front end of the guide wire 2 extend out of the end of the puncture needle 1; then pushes the side interface 42 of the Y-shaped catheter seat 4 to make the catheter 3 exceed the puncture needle 1 and move forward along the guide wire 2; the side interface 42 of the Y-shaped catheter seat 4 acts on the upper breach 611 and the lower breach 621 at the same time to decompose the detachable shell from top to bottom; finally, the puncture needle 1 is pulled out by controlling the lower cover 62, and the guide wire connector 7 is controlled to pull out the guide wire 2; the present invention reduces the cumbersomeness of the operation of inserting a medium-length catheter 3, reduces the operation time, reduces the burden of the operation, and can be operated by a single person.

[0019] The upper cover 612 body includes an upper cover 612 and a buckle cover 613; when assembling the present invention, the guide wire 2 and the guide wire connector 7 are assembled last; the upper cover 612 and the buckle cover 613 are separated from each other, which can reduce the difficulty of the final assembly of the present invention; the buckle plate 6121 extends outward from the inner wall of the rear end of the upper cover 612; the head of the buckle cover 613 cooperates with the buckle plate 6121, which can improve the structural strength of the present invention when not in use, and also facilitates the upper cover 612 to drive the rear lower cover 62 to separate from the lower cover 62 when the three-head joint acts on the upper breach 611 and the lower breach 621.

[0020] An inward-facing U-shaped card 6122 is provided at the rear end of the buckle plate 6121, which can increase the area of ​​the upper cover 612 acting on the buckle cover 613 and improve the effect of the upper cover 612 on the buckle cover 613; the guide wire 2 passes through between the U-shaped cards 6122; the U-shaped card 6122 limits the guide wire 2 to ensure the stability of the movement of the guide wire 2.

[0021] An extension strip 6123 extends from the rear end of the buckle plate 6121; a buckle block 6124 is provided at the end of the extension strip 6123; a buckle groove 622 corresponding to the buckle strip is provided at the rear end of the lower cover 62; the side of the extension strip 6123 is slidably matched with the side of the guide wire connector 7; the side of the extension strip 6123 connected to the guide wire connector 7 is lower in the front and higher in the back; when the guide wire connector 7 is at the end of the extension strip 6123, the buckle block 6124 cooperates with the buckle groove 622 to limit the position between the upper cover 612 and the lower cover 62, thereby increasing the overall stability; when the guide wire connector 7 slides forward, the buckle block 6124 disengages from the buckle groove 622, thereby reducing the difficulty of breaking the side interface 42 of the Y-shaped catheter seat 4 to disassemble the shell.

[0022] The detachable shell also includes a keel 64; the back of the upper cover 612 and the back of the lower cover 62 clamp the keel 64; the tail end of the keel 64 is symmetrically provided with insertion columns 641; the upper cover 612 and the lower cover 62 are correspondingly provided with insertion holes 65; the keel 64 increases the structural stability of the detachable shell.

[0023] A fin plate 642 is provided on the back of the keel 64 for the doctor to grasp when the upper cover 612 and the lower cover 62 are separated.

[0024] The disposable medium-length catheter 3 is also provided with a detachable joint 8; the detachable joint 8 includes a buckle seat 81, a silicone sleeve 82, and an inner sleeve body 83 which are sequentially mounted from the outside to the inside; the buckle seat 81 is detachably connected to the tail interface 43 of the Y-shaped catheter seat 4 through a snap-fit ​​structure, and can be disconnected from the Y-shaped catheter seat 4 after the side interface 42 of the Y-shaped catheter seat 4 acts on the upper breach 611 and the lower breach 621; the tail interface 43 of the Y-shaped catheter seat 4 is provided with a silicone pad 44; a silicone ring 831 is provided at the tail of the inner sleeve body 83; the puncture needle 1 passes through the center of the silicone ring 831, the center of the inner sleeve body 83, the center of the silicone sleeve 82, the center of the buckle seat 81, and the center of the silicone pad 44 in sequence; the silicone ring 831, the silicone sleeve 82, and the silicone pad 44 can be automatically sealed when the puncture needle 1 is detached.

[0025] The head of the upper cover 612 and the head of the lower cover 62 are both provided with double-layer partitions 66; the conduit 3 passes through between the double-layer partitions 66; the double-layer partitions 66 guide and limit the conduit 3 to ensure that the conduit 3 extends forward normally.

[0026] A guide wire guide seat 623 is provided at the rear of the lower cover 62; a guide wire guide groove 6231 is provided on the top surface of the guide wire guide seat 623; the guide wire 2 passes through the guide wire guide groove 6231 and is limited and guided to ensure that the guide wire 2 moves smoothly.

[0027] The tail end of the double-layer partition 66 is provided with an arc chamfer 661 corresponding to the head interface 41 of the Y-shaped catheter seat 4; the head interface 41 of the Y-shaped catheter seat 4 can act on the arc chamfer 661 to separate the upper cover 612 and the lower cover 62 up and down.

[0028] An axial slide rail 643 is provided at the belly of the keel 64 ; a slider 832 slidably matched with the axial slide rail 643 is provided at the rear end of the inner sleeve 83 ; the slider 832 cooperates with the axial slide rail 643 to provide guidance for the forward movement of the Y-shaped catheter seat 4 .

[0029] A symmetrical protrusion 8321 is provided at the top of the rear end of the slider 832; a triangular extrusion groove 67 is provided at the rear of the upper cover 612 and the rear of the lower cover 62; the extrusion groove 67 is larger at the front and smaller at the rear; the protrusion 8321 cooperates with the extrusion groove 67; the protrusion 8321 moves forward to act on the extrusion groove 67, thereby accelerating the separation speed of the upper cover 612, the lower cover 62 and the keel 64, and reducing the difficulty of breaking the side interface 42 of the Y-shaped catheter seat 4 to disassemble the shell.

[0030] The working process of this embodiment includes the following steps: ①Puncture The doctor holds the detachable shell and inserts the tip of the puncture needle 1 into the selected vein to achieve venous puncture; a portion of the catheter 3 also enters the vein; the doctor holds the detachable shell to maintain the structural stability of the detachable shell; ②Insert guide wire 2 The doctor holds the front part of the detachable housing with one hand and pushes the guide wire connector 7 forward with the other hand; the front end of the guide wire 2 gradually extends out of the puncture needle 1 and enters the selected vein; ③ Reach into the conduit 3 and break open the disassembled shell The doctor holds the fin 642 with one hand and pushes the side interface 42 of the Y-shaped catheter seat 4 forward with the other hand, so that the end of the catheter 3 exceeds the puncture needle 1 and moves forward along the guide wire 2; at the same time, the side interface 42 of the Y-shaped catheter seat 4 acts on the upper breach 611 and the lower breach 621, so that the detachable shell is separated from top to bottom to form an upper cover 612 body and a lower cover 62; ④ Pull out the guide wire 2 and puncture needle 1 The doctor holds the guide wire connector 7 and pulls it back; the guide wire 2 passes through the catheter 3 and the Y-shaped catheter seat 4 in sequence and is thus pulled out; the doctor holds the lower cover 62 and slowly pulls it back, and the puncture needle 1 passes through the catheter 3 and the Y-shaped catheter seat 4 in sequence and is thus pulled out.

[0031] ⑤ Stick the Y-shaped catheter seat 4 to the appropriate position of the skin, and use a dressing to stick the head interface 41 of the Y-shaped catheter seat 4 to avoid infection.

[0032] Embodiment 2: Embodiment 2 is basically the same as Embodiment 1, and the similarities are not repeated here. The differences are as follows: a guide wire slot 72 is provided at the end where the guide wire connector 7 connects to the guide wire 2; the cross-section of the guide wire slot 72 matches the guide wire 2, and the busbar is an arc; the end of the guide wire 2 passes through the guide wire slot 72 and is fixedly connected to the upper cover 612; when the guide wire connector 7 moves, the travel of the end of the guide wire 2 is twice that of the guide wire connector 7, and the structure is more compact.

[0033] Example 3: See Fig.14 The third embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that a sheath 9 is mounted on the front end of the detachable shell, and the puncture needle 1 is covered inside the sheath 9 to protect the puncture needle 1 for easy product transportation.

Claims

1. A disposable medium-length catheter, comprising a puncture needle, a guide wire, a catheter, a Y-shaped catheter seat, and an extension tube; the catheter end is connected to the head interface of the Y-shaped catheter seat; the extension tube end is connected to the side interface of the Y-shaped catheter seat; characterized in that: The medium-length catheter also includes a detachable shell and a guide wire connector; the detachable shell includes an upper cover body and a lower cover that are buckled together; the abdomen of the upper cover body and the abdomen of the lower cover are respectively provided with corresponding upper and lower openings that are assembled together; the upper opening and the lower opening are both narrow in front and wide in the back; the side interface of the Y-shaped catheter seat extends from between the upper opening and the lower opening; one end of the puncture needle is inserted into the catheter and exceeds the outer end of the catheter, and the other end passes through the tail interface of the Y-shaped catheter seat and is fixed to the lower cover; one end of the guide wire is inserted into the puncture needle, not exceeding the outer end of the puncture needle, and the other end is connected to one end of the guide wire connector; the guide wire connector and the Y-shaped catheter seat both slide axially along the detachable shell; the other end of the guide wire connector extends out of the detachable shell and is provided with an operating end.

2. The disposable medium-length catheter according to claim 1, characterized in that: The upper cover body comprises an upper cover and a buckle cover; a buckle plate is extended outward from the inner wall of the rear part of the upper cover; and the head of the buckle cover matches with the buckle plate.

3. The disposable medium-length catheter according to claim 2, characterized in that: The rear end of the gusset plate is provided with an inwardly facing U-shaped clip; the guide wire passes through between the U-shaped clips.

4. The disposable medium-length catheter according to claim 2, characterized in that: An extension strip extends from the rear end of the buckle plate; a buckle block is arranged at the end of the extension strip; a buckle groove corresponding to the buckle strip is arranged at the rear end of the lower cover; and the side surface of the extension strip is slidably matched with the side surface of the guide wire joint.

5. The disposable medium-length catheter according to claim 1, characterized in that: The detachable shell also includes a keel; the back of the upper cover body and the back of the lower cover clamp the keel; the tail end of the keel is symmetrically provided with insertion columns; the upper cover body and the lower cover are correspondingly provided with insertion holes.

6. The disposable medium-length catheter according to claim 1, characterized in that: The disposable medium-length catheter is also provided with a detachable joint; the detachable joint includes a buckle seat, a silicone sleeve, and an inner sleeve body which are sequentially mounted from the outside to the inside; the buckle seat is detachably connected to the tail interface of the Y-shaped catheter seat through a snap-fit ​​structure; the tail interface of the Y-shaped catheter seat is provided with a silicone pad; a silicone ring is provided at the tail of the inner sleeve body; the puncture needle passes through the center of the silicone ring, the center of the inner sleeve body, the center of the silicone sleeve, the center of the buckle seat, and the center of the silicone pad in sequence.

7. The disposable medium-length catheter according to claim 1, characterized in that: The upper cover body head and the lower cover head are both provided with double-layer partitions; the conduit passes through between the double-layer partitions.

8. The disposable medium-length catheter according to claim 1, characterized in that: The tail end of the double-layer partition is provided with an arc chamfer corresponding to the head interface of the Y-shaped catheter seat.

9. The disposable medium-length catheter according to claim 1, characterized in that: The end of the guide wire joint connected to the guide wire is provided with a guide wire groove; the cross section of the guide wire groove matches the guide wire, and the busbar is in an arc shape; the end of the guide wire passes through the guide wire groove and is fixedly connected to the upper cover body.

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