Surgical instrument

Abstract

The utility model provides a surgical instrument, which relates to the technical field of medical instruments and comprises a medical catheter, a working part, a transmission part and a handle. The medical catheter comprises an outer catheter body and a supporting tube installed in the outer catheter body. The supporting pipe extends along the inner wall of the outer pipe body. The working part is slidably inserted into the outer tube body, the transmission part penetrates through the medical catheter, the far end of the transmission part is connected with the working part, and the near end of the transmission part is connected with the handle. By means of the technical scheme, the medical catheter can be bent and can easily pass through a bent channel, good structural strength and supporting performance can be maintained under the conditions that the diameter of the outer catheter body is small and the wall thickness is small, and the medical catheter is particularly suitable for surgical instruments placed through thin and narrow forceps channels.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a surgical instrument. Background Technology

[0002] Surgical instruments such as snares typically use medical catheters to deliver the working part to a specific location inside the patient's body under endoscopic guidance. However, for endoscopes with narrower channels, such as cholangioscopy, common medical catheters cannot be inserted through these channels. To accommodate the need for smaller channels, the diameter and wall thickness of the medical catheter usually need to be reduced. This reduces the catheter's support, increasing the risk of deformation or damage, which can easily affect the success of the surgery. Utility Model Content

[0003] The purpose of this invention is to provide a surgical instrument to alleviate the technical problem of weak support in thin-diameter medical catheters.

[0004] In the first aspect, the surgical instrument provided by this utility model includes: a medical catheter, a working part, a transmission part, and a handle;

[0005] The medical catheter includes: an outer tube body and a support tube installed inside the outer tube body;

[0006] The support tube extends along the inner wall of the outer tube body;

[0007] The working part is slidably inserted into the outer tube body, the transmission part passes through the medical catheter, and the distal end of the transmission part is connected to the working part and the proximal end is connected to the handle.

[0008] In conjunction with the first aspect, this utility model provides a first possible implementation of the first aspect, wherein the support tube includes a mesh structure or a spiral structure that conforms to the inner wall of the outer tube body.

[0009] In conjunction with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the support tube has a fixed part fixed relative to the outer tube body and a movable part movable relative to the support tube;

[0010] The movable part moves relative to the fixed part to change the mesh size or pitch of the support tube.

[0011] In conjunction with the first possible implementation of the first aspect, the present invention provides a third possible implementation of the first aspect, wherein the mesh density of the support tube gradually increases from the proximal end to the distal end, or the pitch of the support tube gradually decreases from the proximal end to the distal end.

[0012] In conjunction with the first possible implementation of the first aspect, this utility model provides a fourth possible implementation of the first aspect, wherein the mesh density at the distal end of the support tube is greater than the mesh density at the proximal end, or the pitch at the distal end of the support tube is less than the pitch at the proximal end.

[0013] In conjunction with the first aspect, this utility model provides a fifth possible implementation of the first aspect, wherein the support tube is formed by winding metal wire, or the support tube is formed by carving metal tube.

[0014] In conjunction with the first aspect, this utility model provides a sixth possible implementation of the first aspect, wherein the hardness of the distal end of the support tube is less than the hardness of the proximal end.

[0015] In conjunction with the first aspect, this utility model provides a seventh possible implementation of the first aspect, wherein the wall thickness at the distal end of the support tube is less than the wall thickness at the proximal end.

[0016] In conjunction with the first aspect, this utility model provides an eighth possible implementation of the first aspect, wherein the distal end of the support tube and the distal end of the outer tube body are spaced apart in a direction from the proximal end to the distal end, so that the support tube avoids the instrument receiving area at the distal end of the outer tube body.

[0017] In conjunction with the first aspect, this utility model provides a ninth possible implementation of the first aspect, wherein the handle includes: a core rod and a slider that slidably engages with the core rod;

[0018] The proximal end of the outer tube body is connected to the core rod, and the proximal end of the transmission part is connected to the slider.

[0019] In conjunction with the ninth possible implementation of the first aspect, this utility model provides a tenth possible implementation of the first aspect, wherein the transmission part includes: a connecting pipe and a cable;

[0020] The connecting pipe is slidably fitted into the outer tube body, and the connecting pipe is connected to the working part;

[0021] The distal end of the cable is connected to the connecting tube, and the proximal end of the cable is connected to the slider.

[0022] In conjunction with the tenth possible implementation of the first aspect, the present invention provides an eleventh possible implementation of the first aspect, wherein the surface of the cable is coated with a lubricating coating.

[0023] In conjunction with the first aspect, the present invention provides a twelfth possible implementation of the first aspect, wherein the working part includes a collar having a radially expanding elastic tendency.

[0024] In conjunction with the twelfth possible implementation of the first aspect, this utility model provides a thirteenth possible implementation of the first aspect, wherein the collar in the unfolded state can be configured as a rhomboid structure, an elliptical structure, or a hexagonal structure.

[0025] The present invention provides the following beneficial effects: by installing a support tube inside the outer tube body and having the support tube have a mesh or spiral structure extending along the inner wall of the outer tube body, the medical catheter can be bent and easily pass through curved channels. It can also maintain better support when the outer tube body has a small diameter and thin wall thickness, and is especially suitable for surgical instruments inserted through narrow forceps channels.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the surgical instrument provided in an embodiment of the present invention in the state of having its working part released;

[0029] Figure 2 A schematic diagram of the surgical instrument provided in an embodiment of the present invention in the retracted state of its working part;

[0030] Figure 3 A schematic diagram of a first type of support tube for a surgical instrument provided in an embodiment of this utility model;

[0031] Figure 4 A schematic diagram of a second type of support tube for a surgical instrument provided in an embodiment of this utility model;

[0032] Figure 5 A schematic diagram of a third type of support tube for a surgical instrument provided in an embodiment of this utility model;

[0033] Figure 6 A schematic diagram of the fourth type of support tube for a medical catheter provided in an embodiment of this utility model;

[0034] Figure 7 A schematic diagram of the fifth type of support tube for a medical catheter provided in an embodiment of this utility model;

[0035] Figure 8 A schematic diagram of the sixth type of support tube for a medical catheter provided in an embodiment of this utility model;

[0036] Figure 9 A schematic diagram of the seventh type of support tube for a medical catheter provided in this embodiment of the present utility model;

[0037] Figure 10 A schematic diagram of an eighth type of support tube for a medical catheter provided in this embodiment of the present utility model;

[0038] Figure 11 A schematic diagram of another state of the eighth type of support tube for the medical catheter provided in this embodiment of the utility model;

[0039] Figure 12 A schematic diagram of a ninth type of support tube for a medical catheter provided in an embodiment of this utility model;

[0040] Figure 13 This is a schematic diagram of another state of the ninth type of support tube for the medical catheter provided in this embodiment of the utility model.

[0041] Icons: 100 - Outer tube body; 101 - Instrument receiving area; 200 - Support tube; 201 - Fixed part; 202 - Moving part; 300 - Working part; 400 - Transmission part; 410 - Connecting tube; 420 - Cable; 500 - Handle; 510 - Core rod; 520 - Slider. Detailed Implementation

[0042] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0043] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, "near end" and "far end" are used with the operator or operating handle as a reference to obtain the corresponding orientation reference. "First," "second," and "third" are only used to describe the differences in names and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities of the International System of Units (SI) base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the surgical instrument provided in this embodiment of the present invention includes: a medical catheter, a working part 300, a transmission part 400, and a handle 500; the medical catheter includes: an outer tube body 100 and a support tube 200 installed inside the outer tube body 100; the support tube 200 extends along the inner wall of the outer tube body 100; the working part 300 is slidably inserted into the outer tube body 100, the transmission part 400 passes through the medical catheter, and the distal end of the transmission part 400 is connected to the working part 300 and the proximal end is connected to the handle 500.

[0046] The handle 500 transmits pushing and pulling forces through the transmission part 400, thereby pushing the working part 300 to release from the far end of the outer tube body 100, or pulling the working part 300 to retract from the far end of the outer tube body 100 into the interior of the outer tube body 100.

[0047] The outer tube body 100 is made of materials such as polytetrafluoroethylene (PTFE) or perfluoroethylene propylene (FEP), which have temperature and pressure resistance properties. While reducing the outer diameter and wall thickness of the outer tube body 100, a support tube 200 is installed inside the outer tube body 100 to achieve structural reinforcement. The support tube 200 can be made of stainless steel, nickel-titanium alloy, or other equivalent high-hardness materials, which can significantly improve the strength and support of the medical catheter.

[0048] Furthermore, the support tube 200 includes a mesh structure or a spiral structure that fits into the inner wall of the outer tube body 100.

[0049] In an optional embodiment, the support tube 200 can be processed into a mesh structure with a specific mesh density, or the support tube 200 can be processed into a spiral structure with a specific pitch.

[0050] It should be noted that the mesh density of the support tube 200 mainly refers to the number of mesh openings within a certain size range along the axial direction of the support tube 200. As the mesh density increases, the number of mesh openings within a certain size range along the axial direction of the support tube 200 increases.

[0051] like Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown, in this embodiment of the invention, the support tube 200 has a fixed part 201 fixed relative to the outer tube body 100 and a movable part 202 movable relative to the support tube 200. The movable part 202 moves relative to the fixed part 201 to change the pitch of the support tube 200 or the mesh size in the axial direction of the support tube 200. By changing the mesh size of the mesh structure or the pitch of the spiral structure, the flexibility and support of the support tube 200 can be adjusted. In other words, by increasing the mesh size or pitch in the axial direction of the support tube 200, the support tube 200 can be made more flexible, thereby making the medical catheter more suitable for insertion through curved endoscopic channels. See also Figure 10 and Figure 12 In the initial state, the spiral structure of the support tube 200 maintains a certain pitch density. When the movable part 202 moves away from the fixed part 201, thereby pulling the support tube 200 to elongate, see... Figure 11 and Figure 13 As the gap and pitch of the spiral structure increase, the support tube 200 becomes more easily bent.

[0052] like Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, in an optional embodiment, the mesh density of the support tube 200 gradually increases from the proximal end to the distal end, or the pitch of the support tube 200 gradually decreases from the proximal end to the distal end. The distal end of the support tube 200 has a denser mesh, or the distal end of the support tube 200 has a smaller pitch and a tighter spiral perforation, thereby making the distal end of the support tube 200 easier to bend and pass through bends.

[0053] In optional embodiments, the mesh density at the distal end of the support tube 200 is greater than that at the proximal end, or the pitch at the distal end of the support tube 200 is smaller than that at the proximal end. The mesh size or pitch at the distal end of the support tube 200 along its own axial direction is greater than or equal to 0.03 mm, and the mesh size or pitch at the proximal end of the support tube 200 along its own axial direction is greater than or equal to 0.3 mm. Specifically, a smaller pitch or mesh structure is used within a range of 1 mm to 100 mm, or 1 mm to 500 mm, at the distal end of the support tube 200. A smaller pitch or larger mesh density at the distal end results in a denser pore distribution, making it easier to bend and pass through the endoscope's bend; a larger pitch or smaller mesh density at the proximal end results in a sparser pore distribution, providing better support performance and facilitating pushing.

[0054] like Figure 9 As shown, in an optional embodiment, the hardness of the distal end of the support tube 200 can be made less than that of the proximal end, which can also improve the bending performance of the distal end of the support tube 200.

[0055] like Figure 8 As shown, in an optional embodiment, the wall thickness at the distal end of the support tube 200 is less than that at the proximal end, and the wall thickness at the distal end of the support tube 200 is thinner, making it easier to bend; the wall thickness at the proximal end of the support tube 200 is larger, providing better support.

[0056] See Figure 3 In one alternative embodiment, the support tube 200 may be formed by winding metal wire.

[0057] See Figure 4 and Figure 5 In another alternative embodiment, the support tube 200 can be made of metal tube and can be spirally carved or have mesh engraved along the side wall of the metal tube to form a spiral structure or a mesh structure.

[0058] like Figure 1 and Figure 2 As shown, the distal end of the support tube 200 and the distal end of the outer tube body 100 are spaced apart in the direction from the proximal end to the distal end, thereby preventing the support tube 200 from extending to the distal end of the outer tube body 100. The support tube 200 avoids the instrument receiving area 101 at the distal end of the outer tube body 100. On the one hand, it reserves enough space for the instrument receiving area 101, and on the other hand, it reduces the resistance of the working part 300 to release to the distal end, and makes it easier for the working part 300 to retract into the instrument receiving area 101.

[0059] In an optional embodiment, the handle 500 includes a core rod 510 and a slider 520 that slides on the core rod 510; the proximal end of the outer tube body 100 is connected to the core rod 510, and the proximal end of the transmission part 400 is connected to the slider 520. The proximal end of the outer tube body 100 is supported by the core rod 510. By operating the slider 520 to slide relative to the core rod 510, the transmission part 400 can be pushed or pulled, thereby enabling the release and retraction of the working part 300.

[0060] In an optional embodiment, the transmission unit 400 includes a connecting pipe 410 and a cable 420. The connecting pipe 410 is slidably fitted within the outer tube body 100 and is connected to the working part 300. The distal end of the cable 420 is connected to the connecting pipe 410, and the proximal end of the cable 420 is connected to the slider 520. The connection between the connecting pipe 410 and the working part 300, as well as the connection between the connecting pipe 410 and the cable 420, can be achieved by welding or riveting. The cable 420 is loosely fitted inside the medical catheter. By pushing or pulling the cable 420 through the slider 520, a pushing or pulling force can be transmitted, thereby realizing the release and retrieval of the working part 300.

[0061] Furthermore, the cable 420 is made of materials such as stainless steel and nickel-titanium, and can be configured as a monofilament structure or a cable structure, providing flexibility. The surface of the cable 420 is coated with a lubricating coating, which reduces the frictional resistance of the cable 420 within the medical catheter, thereby making the release and retrieval of the working part 300 easier.

[0062] Furthermore, the working part 300 includes a collar with an elastic tendency to expand radially. The collar can be made of stainless steel, nickel-titanium, or a combination of materials, and can be configured as a rhomboid, elliptical, or hexagonal structure in the expanded state.

[0063] The medical catheter fabrication method includes the following steps:

[0064] A support tube 200 is installed inside the outer tube body 100;

[0065] The support tube 200 has a mesh structure or a spiral structure extending along the inner wall of the outer tube body 100.

[0066] The medical catheter obtained by this processing method has improved structural strength and support through the support tube 200, while reducing the outer diameter and wall thickness of the outer tube body 100. It can be bent and inserted along the curved endoscope channel, making it especially suitable for use in narrow endoscope channels.

[0067] In an optional embodiment, the support tube 200 may have a fixed part 201 fixed relative to the outer tube body 100 and a movable part 202 movable relative to the support tube 200. The medical catheter processing method further includes: adjusting the movable part 202 to move relative to the fixed part 201 to change the mesh size or pitch of the support tube 200. By moving the movable part 202 relative to the fixed part 201 along the axial direction of the support tube 200, the mesh size or pitch in the axial direction of the support tube 200 is changed accordingly, thereby changing the bending resistance and support performance of the support tube 200. The flexibility and support of the support tube 200 can be adjusted as needed. When the bending degree of the endoscopic forceps channel is large, the mesh size or pitch in the axial direction of the support tube 200 can be increased to make the medical catheter easier to bend, thereby making the insertion of surgical instruments smoother.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A surgical instrument, characterized in that, include: Medical catheter, working part (300), transmission part (400) and handle (500); The medical catheter includes: an outer tube body (100) and a support tube (200) installed inside the outer tube body (100); The support tube (200) extends along the inner wall of the outer tube body (100); The working part (300) is slidably inserted into the outer tube body (100), the transmission part (400) passes through the medical catheter, and the distal end of the transmission part (400) is connected to the working part (300), and the proximal end is connected to the handle (500).

2. The surgical instrument according to claim 1, characterized in that, The support tube (200) includes a mesh structure or a spiral structure that fits into the inner wall of the outer tube body (100).

3. The surgical instrument according to claim 2, characterized in that, The support tube (200) has a fixing part (201) that is fixed relative to the outer tube body (100) and a movable part (202) that is movable relative to the outer tube body (100); The movable part (202) moves relative to the fixed part (201) to change the mesh size or pitch of the support tube (200).

4. The surgical instrument according to claim 2, characterized in that, The mesh density of the support tube (200) gradually increases from the proximal end to the distal end, or the pitch of the support tube (200) gradually decreases from the proximal end to the distal end.

5. The surgical instrument according to claim 2, characterized in that, The mesh density at the distal end of the support tube (200) is greater than that at the proximal end, or the pitch at the distal end of the support tube (200) is less than that at the proximal end.

6. The surgical instrument according to claim 1, characterized in that, The support tube (200) is formed by winding metal wire, or the support tube (200) is formed by carving metal tube.

7. The surgical instrument according to claim 1, characterized in that, The hardness of the distal end of the support tube (200) is less than that of the proximal end.

8. The surgical instrument according to claim 1, characterized in that, The wall thickness at the distal end of the support tube (200) is less than that at the proximal end.

9. The surgical instrument according to claim 1, characterized in that, The distal end of the support tube (200) and the distal end of the outer tube body (100) are spaced apart in a direction from the proximal end to the distal end, so that the support tube (200) avoids the instrument receiving area (101) at the distal end of the outer tube body (100).

10. The surgical instrument according to claim 1, characterized in that, The handle (500) includes: a core rod (510) and a slider (520) that slidably engages with the core rod (510); The proximal end of the outer tube body (100) is connected to the core rod (510), and the proximal end of the transmission part (400) is connected to the slider (520).

11. The surgical instrument according to claim 10, characterized in that, The transmission unit (400) includes: a connecting pipe (410) and a cable (420); The connecting pipe (410) is slidably fitted inside the outer pipe body (100), and the connecting pipe (410) is connected to the working part (300); The distal end of the cable (420) is connected to the connecting tube (410), and the proximal end of the cable (420) is connected to the slider (520).

12. The surgical instrument according to claim 11, characterized in that, The surface of the cable (420) is coated with a lubricating coating.

13. The surgical instrument according to claim 1, characterized in that, The working part (300) includes a collar having an elastic tendency to expand radially.

14. The surgical instrument according to claim 13, characterized in that, The ring can be configured as a rhomboid, elliptical, or hexagonal structure when unfolded.

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