Quick exchange conveyor for self-expansion stent

Abstract

The utility model discloses a quick exchange conveyor for a self-expansion stent, which comprises an outer catheter, a first channel, a second channel and a guide wire quick exchange port, the inner tube is provided with a second channel, and the far end of the inner tube is provided with a self-expansion support; the push-pull assembly is fixedly connected with the near end of the inner tube and drives the inner tube to move back and forth in the first channel of the outer catheter; a third channel is arranged at the far end of the guide wire leading-out piece, a guide wire port is formed in the side wall of the guide wire leading-out piece and communicated with the third channel, and an inclined face extending to the side wall of the third channel is arranged at the guide wire port. The inner tube is fixedly inserted into the third channel of the guide wire leading-out piece, the near end of the guide wire leading-out piece is fixedly connected with the push-pull assembly, and the guide wire enters the second channel through the far end of the inner tube and penetrates out of the guide wire port and the guide wire rapid exchange port. According to the scheme, a short guide wire is used in a matched mode, and the stent can be implanted only by one doctor.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a rapid exchange conveyor for a self-expanding stent. Background Art

[0002] At present, the number of endoscopic surgeries used clinically to treat abnormal pathologies in the digestive system and biliary system (including the bile duct, hepatic duct and pancreatic duct) is increasing. One of the main methods for treating stenosis or obstruction in the bile duct or intestine is to place a metal self-expanding stent in the bile duct or intestine to complete the dilation of the stenosis or obstruction in the bile duct or intestine, thereby ensuring the patency of the bile duct or intestine.

[0003] During the operation, in order to smoothly place the metal self-expanding stent in the bile duct or intestine into the target position, it is necessary to use a corresponding delivery system. During use, this delivery system needs to compress the metal self-expanding stent between the inner and outer tubes to obtain a corresponding reduced stent outer diameter so that it can be smoothly delivered into the human bile duct or intestine through the working channel of the endoscope. During the use of the delivery system, the guide wire needs to be able to smoothly pass through the inner tube cavity. The existing product delivery systems on the market basically have the guide wire in the inner tube, which often requires a long guide wire and cannot achieve the stent placement by the doctor alone during the operation.

[0004] In order to solve the above problems, a patent application with publication number CN2715700Y discloses a rapid exchange and delivery system for a self-expanding medical stent, comprising an end, an inner tube, an outer tube that can slide on the outer tube, and an outlet is opened on the side wall of one end of the outer tube; it also includes a double-lumen tube and a push rod, the double-lumen tube is located inside the outer tube, and the inner tube and the push rod are respectively located in different lumens of the double-lumen tube; it also includes a guide wire positioning tube located inside the proximal end of the outer tube, one end of the guide wire positioning tube is fixedly connected to the guide wire outlet on the side wall of the outer tube; the other end can slide relative to the double-lumen tube and extend from the end of the double-lumen tube away from the end into the first lumen, The guidewire positioning tube is inserted into the double-lumen tube and connected with the inner tube part; the inner tube and the push rod are fixed by the double-lumen tube, and the guidewire is guided by the guidewire positioning tube, so as to realize the rapid exchange of the guidewire. However, this scheme has the following problems: when assembling the rapid exchange delivery system of the self-expanding medical stent of this scheme, it is necessary to fix the inner tube and the push rod in the double-lumen tube in advance, and then put the double-lumen tube in the outer tube. At the same time, it is necessary to extend the guidewire positioning tube fixed on the outer tube into the double-lumen tube, and then extend the distal end of the guidewire positioning tube into the inner tube, which has a complex structure, high cost, low assembly efficiency and high assembly difficulty. Utility Model Content

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide a rapid exchange delivery system for a self-expanding stent, which is used in conjunction with a shorter guide wire so that only one doctor can complete the placement of the stent.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] A rapid exchange conveyor for a self-expanding stent, comprising:

[0008] An outer catheter, wherein the outer catheter is provided with a first channel along the length direction, and a guidewire quick exchange port is opened on the side wall of the outer catheter;

[0009] An inner tube, wherein the inner tube is provided with a second passage along the length direction, and a self-expanding stent is installed at the distal end of the inner tube;

[0010] A push-pull assembly is fixedly connected to the proximal end of the inner tube and drives the inner tube to move back and forth in the first channel of the outer catheter;

[0011] Also includes:

[0012] A guidewire outlet, wherein a third channel is provided at the distal end of the guidewire outlet, a guidewire port is provided on the side wall of the guidewire outlet, the guidewire port is communicated with the third channel, and an inclined surface extending to the side wall of the third channel is provided at the guidewire port;

[0013] The inner tube is fixedly inserted in the third channel of the guidewire outlet, the proximal end of the guidewire outlet is fixedly connected to the push-pull assembly, the guidewire passes through the distal end of the inner tube into the second channel, and passes out through the guidewire port and the guidewire quick exchange port.

[0014] During the use of the rapid exchange conveyor, the guide wire pre-inserted into the target position enters the distal end of the inner tube, and then passes through the guide wire port and the guide wire rapid exchange port. The guide wire is fixed with a guide wire lock. The doctor can then push the self-expanding stent along the guide wire to the target position using the rapid exchange conveyor, fix the push-pull assembly and the self-expanding stent, withdraw the outer catheter backwards, expose and release the self-expanding stent, and after achieving the purpose of releasing the self-expanding stent, pull back the rapid exchange conveyor and the guide wire. The rapid exchange conveyor can use a shorter guide wire. Through the above process, the purpose of stent implantation can be completed by only one doctor.

[0015] Preferably, it further comprises a middle tube and a middle tube developing ring, wherein the middle tube is sleeved on the inner tube and located at the rear side of the self-expanding stent, and the middle tube developing ring is sleeved on the inner tube and located between the self-expanding stent and the middle tube.

[0016] Preferably, it also includes a soft head, which is fixedly arranged at the distal end of the inner tube, the soft head is located in front of the self-expanding stent, and a guide wire insertion hole is provided on the soft head, the guide wire insertion hole on the soft head is connected to the second channel of the inner tube, and the outer diameter of the soft head is larger than the inner diameter of the first channel.

[0017] Preferably, a guide portion is provided at the distal end of the soft head.

[0018] Preferably, the push-pull assembly includes, from far to near, a push-pull mandrel, a front handle, a booster tube and a rear handle, the front handle is fixedly connected to the proximal end of the outer catheter, the distal end of the push-pull mandrel is located in the first channel of the outer catheter and fixedly connected to the proximal end of the guide wire lead-out piece, the proximal end of the push-pull mandrel passes through the front handle and is connected to the rear handle through the booster tube, and the rear handle is located behind the front handle.

[0019] Preferably, a fourth channel is provided at the proximal end of the guide wire lead-out member, and the distal end of the push-pull mandrel is inserted into the fourth channel of the guide wire lead-out member.

[0020] Preferably, the second channel of the inner tube and the third channel of the guide wire outlet are coaxially arranged.

[0021] Preferably, the self-expanding stent is a self-expanding metal stent.

[0022] Preferably, the outer conduit is an integrated hose.

[0023] Preferably, the outer catheter is composed of a distal hose, a switching outer tube, a fourth outer tube and a proximal outer tube in sequence from far to near, and the guide wire quick exchange port is opened on the side wall of the switching outer tube.

[0024] The utility model has the following beneficial effects due to the adoption of the above technical solution: in the utility model, a guide wire quick exchange port is provided at the outer catheter, a guide wire outlet is provided to connect the inner tube and the push-pull assembly, and the outlet of the guide wire is guided, so that a shorter guide wire can be used, and only one doctor is required to complete the stent implantation throughout the whole process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 is a schematic diagram of the structure of the outer catheter in Example 1;

[0027] Figure 3 This is a schematic diagram of the structure of the transfer outer tube in Example 1;

[0028] Figure 4 is a schematic diagram of the structure of the outer catheter in Example 2;

[0029] Figure 5 It is a structural schematic diagram of a guide wire lead-out member;

[0030] Figure 6 is a partial structural schematic diagram of the self-expanding stent in Example 1 when it is in a contracted state;

[0031] Figure 7It is a partial structural schematic diagram of the self-expanding stent in Example 1 when it is in a released state.

[0032] Reference numerals:

[0033] 100, first channel; 200, guidewire quick exchange port; 1, soft head; 2, distal hose; 3, inner tube; 301, second channel; 4, middle tube developing ring; 5, middle tube; 6, guidewire outlet; 601, inclined plane; 602, third channel; 603, fourth channel; 604, guidewire port; 7, adapter outer tube; 8, fourth outer tube; 9, push-pull mandrel; 10, proximal outer tube; 11, front handle; 12, booster tube; 13, rear handle; 14, self-expanding stent; 900, guidewire. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] For the purpose of clear description, in the present invention, during operation, the end away from the user is referred to as the distal end or the front end, and the end close to the user is referred to as the proximal end or the rear end.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Example 1

[0040] like Figures 1 to 7 The rapid exchange conveyor for a self-expanding stent shown in the figure comprises: an outer catheter, the outer catheter is provided with a first channel 100 along the length direction, and a guide wire rapid exchange port 200 is opened on the side wall of the outer catheter; an inner tube 3, the inner tube 3 is provided with a second channel 301 along the length direction, and the distal end of the inner tube 3 is equipped with a self-expanding stent 14; a push-pull assembly, which is fixedly connected to the proximal end of the inner tube 3 and drives the inner tube 3 to move back and forth in the first channel 100 of the outer catheter; and also comprises: a guide wire guide member 6, the distal end of the guide wire guide member 6 is provided with a second channel 301. Three channels 602, a guidewire port 604 is opened on the side wall of the guidewire outlet 6, the guidewire port 604 is connected to the third channel 602, and the guidewire port 604 is provided with a slope 601 extending to the side wall of the third channel 602; the inner tube 3 is fixedly inserted in the third channel 602 of the guidewire outlet 6, and the proximal end of the guidewire outlet 6 is fixedly connected to the push-pull assembly, and the guidewire 900 passes through the distal end of the inner tube 3 into the second channel 301, and passes through the guidewire port 604 and the guidewire quick exchange port 200.

[0041] In the present invention, a guidewire quick exchange port 200 is provided at the outer catheter, and a guidewire outlet 6 is provided to connect the inner tube 3 and the push-pull assembly, and guide the outlet of the guidewire 900. When in use, the guidewire 900 pre-placed in the target position enters the distal end of the inner tube 3, and then passes through the guidewire port 604 and the guidewire quick exchange port 200, and the guidewire 900 is fixed using a guidewire lock. The doctor can push the self-expanding stent to the target position along the guidewire 900 using a quick exchange conveyor, fix the push-pull assembly and the self-expanding stent 14, withdraw the outer catheter backwards, thereby exposing and releasing the self-expanding stent 14, and finally pull back the quick exchange conveyor and the guidewire 900. The quick exchange conveyor can use a shorter guidewire 900, and the above process can achieve the purpose of completing the stent implantation by only one doctor.

[0042] In order to perform X-ray development marking on the distal working area, a middle tube 5 and a middle tube development ring 4 are generally included. The middle tube 5 is sleeved on the inner tube 3 and located at the rear side of the self-expanding stent 14. The middle tube development ring 4 is sleeved on the inner tube 3 and located between the self-expanding stent 14 and the middle tube 5. The middle tube development ring 4 is a stainless steel development ring.

[0043] like Figure 1 , Figure 6 and Figure 7 As shown, the rapid exchange conveyor for the self-expanding stent further comprises a soft head 1, which is fixedly arranged at the distal end of the inner tube 3, and is located in front of the self-expanding stent 14. The soft head 1 is provided with a guide wire insertion hole, which is connected to the second channel 301 of the inner tube 3, and the outer diameter of the soft head 1 is greater than the inner diameter of the first channel 100. In this way, Figure 6 As shown, when the self-expanding stent 14 is retracted in the first channel 100 of the outer catheter, the soft head 1 blocks the distal end of the first channel 100 to prevent the self-expanding stent 14 from being triggered by mistake. At this time, the guide wire lead-out member 6 is located at the guide wire rapid exchange port 200. When the expandable stent is pushed to the target position along the guide wire 900 using a rapid exchange conveyor, the soft head 1 can also play a guiding role. In order to make the pushing smoother, a guide portion is provided at the distal end of the soft head 1. The cross-section of the guide portion can be an elliptical shape or a trapezoidal shape that is convenient for guiding. This can also reduce the stimulation caused by the contact between the soft head 1 and the intestinal wall during pushing, and relieve the patient's discomfort.

[0044] In the present utility model, if Figure 1 As shown, the push-pull assembly includes, from far to near, a push-pull mandrel 9, a front handle 11, an auxiliary tube 12 and a rear handle 13. The front handle 11 is fixedly connected to the proximal end of the outer catheter. The distal end of the push-pull mandrel 9 is located in the first channel 100 of the outer catheter and is fixedly connected to the proximal end of the guidewire outlet 6. The proximal end of the push-pull mandrel 9 passes through the front handle 11 and is connected to the rear handle 13 through the auxiliary tube 12. The rear handle 13 is located behind the front handle 11. In this way, when in use, first grasp the front handle 11 to push the rapid exchange conveyor as a whole along the guidewire 900 to the target position, and then fix the rear handle 13 to fix the auxiliary tube 12, the push-pull mandrel 9, the guidewire outlet 6, the self-expanding stent 14 and the soft head 1, as shown in FIG. Figure 7 As shown, the front handle 11 is withdrawn rearwardly to withdraw the outer catheter, exposing and releasing the self-expanding stent 14 .

[0045] like Figure 1 and Figure 5 As shown, the proximal end of the guide wire outlet 6 is provided with a fourth channel 603 , and the distal end of the push-pull mandrel 9 is inserted into the fourth channel 603 of the guide wire outlet 6 .

[0046] In the utility model, the second channel 301 of the inner tube 3 and the third channel 602 of the guide wire outlet 6 are coaxially arranged, and the second channel 301 of the inner tube 3 and the guide wire insertion hole of the soft head 1 are coaxially arranged, so that the guide wire 900 can be prevented from getting stuck during the process of inserting the guide wire 900.

[0047] In the present invention, the self-expanding stent 14 is a self-expanding metal stent.

[0048] Because the outer catheter is long, Figure 2 and Figure 3 As shown, the outer catheter is composed of a distal hose 2, a switching outer tube 7, a fourth outer tube 8 and a proximal outer tube 10, which are spliced ​​in sequence from far to near. The guidewire quick exchange port 200 is opened on the side wall of the switching outer tube 7, dividing the outer catheter into multiple sections. The outer diameter of the distal hose of the outer catheter is larger, so that it can accommodate the self-expanding stent 14; the outer diameter of the proximal outer tube 10 of the outer catheter is smaller, so that the proximal outer tube 10 can be parallel to the guidewire 900 in the working channel of the endoscope. Example 2

[0049] The difference between this embodiment and embodiment 1 is the outer conduit, which is an integrated hose in this embodiment. The integrated hose has good sealing performance and is easy to shape, but because the outer conduit is long, the outer conduit may sag or bend during the pushing process.

[0050] All features described in the specification, the attached claims and the drawings, whether alone or in any combination thereof, are important features of the present utility model.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "an implementation", "specific implementation", "other implementations", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment, implementation or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described above may also be combined in a suitable manner in any one or more embodiments, implementations or examples. The technical solution recorded in the present utility model also includes a technical solution formed by any one or more of the specific features, structures, materials or characteristics described above in a separate or combined manner.

[0052] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model. Ordinary technicians in the field can change, modify, replace, modify, delete some features, add features or re-combine features to form a technical solution in the above embodiments without departing from the principles and purpose of the utility model within the scope of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the innovative principles of the utility model are still within the scope of the technical solution of the utility model.

Claims

1. A rapid exchange conveyor for a self-expanding stent, comprising: An outer catheter, wherein the outer catheter is provided with a first channel (100) along the length direction, and a guidewire quick exchange port (200) is opened on the side wall of the outer catheter; An inner tube (3), wherein the inner tube (3) is provided with a second passage (301) along the length direction, and a self-expanding stent (14) is installed at the distal end of the inner tube (3); A push-pull assembly fixedly connected to the proximal end of the inner tube (3) and driving the inner tube (3) to move forward and backward in the first channel (100) of the outer catheter; It is characterized by further comprising: A guidewire outlet member (6), wherein a third channel (602) is provided at the distal end of the guidewire outlet member (6), a guidewire port (604) is provided on the side wall of the guidewire outlet member (6), the guidewire port (604) is communicated with the third channel (602), and an inclined surface (601) extending to the side wall of the third channel (602) is provided at the guidewire port (604); The inner tube (3) is fixedly inserted into the third channel (602) of the guide wire outlet (6), the proximal end of the guide wire outlet (6) is fixedly connected to the push-pull assembly, the guide wire (900) passes through the distal end of the inner tube (3) into the second channel (301), and passes out through the guide wire port (604) and the guide wire quick exchange port (200).

2. A rapid exchange conveyor for a self-expanding stent according to claim 1, characterized in that: It also comprises a middle tube (5) and a middle tube developing ring (4), wherein the middle tube (5) is sleeved on the inner tube (3) and is located at the rear side of the self-expanding stent (14), and the middle tube developing ring (4) is sleeved on the inner tube (3) and is located between the self-expanding stent (14) and the middle tube (5).

3. A rapid exchange conveyor for a self-expanding stent according to claim 1, characterized in that: The invention also comprises a soft head (1), wherein the soft head (1) is fixedly arranged at the distal end of the inner tube (3), the soft head (1) is located in front of the self-expanding stent (14), and a guide wire insertion hole is provided on the soft head (1), the guide wire insertion hole on the soft head (1) is connected to the second channel (301) of the inner tube (3), and the outer diameter of the soft head (1) is greater than the inner diameter of the first channel (100).

4. A rapid exchange conveyor for a self-expanding stent according to claim 3, characterized in that: A guide portion is provided at the distal end of the soft head (1).

5. A rapid exchange conveyor for a self-expanding stent according to claim 1, characterized in that: The push-pull assembly comprises, from far to near, a push-pull core shaft (9), a front handle (11), an auxiliary tube (12) and a rear handle (13), wherein the front handle (11) is fixedly connected to the proximal end of the outer catheter, the distal end of the push-pull core shaft (9) is located in the first channel (100) of the outer catheter and is fixedly connected to the proximal end of the guide wire outlet (6), the proximal end of the push-pull core shaft (9) passes through the front handle (11) and is connected to the rear handle (13) through the auxiliary tube (12), and the rear handle (13) is located behind the front handle (11).

6. A rapid exchange conveyor for a self-expanding stent according to claim 5, characterized in that: The proximal end of the guide wire lead-out member (6) is provided with a fourth channel (603), and the distal end of the push-pull mandrel (9) is inserted into the fourth channel (603) of the guide wire lead-out member (6).

7. A rapid exchange conveyor for a self-expanding stent according to claim 1, characterized in that: The second channel (301) of the inner tube (3) and the third channel (602) of the guide wire outlet (6) are coaxially arranged.

8. A rapid exchange conveyor for a self-expanding stent according to claim 1, characterized in that: The self-expanding stent (14) is a self-expanding metal stent.

9. A rapid exchange conveyor for a self-expanding stent according to any one of claims 1 to 8, characterized in that: The outer conduit is an integrated hose.

10. A rapid exchange conveyor for a self-expanding stent according to any one of claims 1 to 8, characterized in that: The outer catheter is composed of a distal hose (2), a switching outer tube (7), a fourth outer tube (8) and a proximal outer tube (10) in sequence from far to near, and the guide wire quick exchange port (200) is opened on the side wall of the switching outer tube (7).

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