Medical catheter, surgical instrument and medical catheter processing method

Abstract

The invention provides a medical catheter, a surgical instrument and a medical catheter processing method, and relates to the technical field of medical instruments.According to the medical catheter, a supporting tube is installed in an outer tube body, the supporting tube extends along the inner wall of the outer tube body, the medical catheter can be bent and can easily pass through a bent channel, and therefore the medical catheter can be bent easily; in addition, the better structural strength and supporting performance can be maintained under the conditions that the diameter of the outer tube body is small and the wall thickness is small, and the outer tube is particularly suitable for surgical instruments placed through a thin and narrow forceps channel.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a medical catheter, a surgical instrument and a medical catheter processing method. Background Art

[0002] Surgical instruments such as snares usually use medical catheters to deliver the working part to a specific location in the patient's body under endoscopy. However, for endoscopes with thinner clamp channels, such as choledochoscopes, common medical catheters cannot be inserted through the clamp channels. In order to meet the needs of insertion into small clamp channels, it is usually necessary to reduce the diameter and wall thickness of the medical catheter, which will lead to a decrease in the support of the medical catheter, thereby increasing the risk of deformation or damage of the medical catheter, which can easily affect the smooth progress of the operation. Summary of the invention

[0003] The object of the present invention is to provide a medical catheter, a surgical instrument and a medical catheter processing method to alleviate the technical problem of weak support of thin-diameter medical catheters.

[0004] In a first aspect, the present invention provides a medical catheter, comprising: an outer tube body and a support tube installed inside the outer tube body;

[0005] The support tube extends along the inner wall of the outer tube body.

[0006] In combination with the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the support tube includes a mesh structure or a spiral structure that is attached to the inner wall of the outer tube body.

[0007] In combination 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 portion fixed relative to the outer tube body, and a movable portion movable relative to the outer tube body;

[0008] The movable part moves relative to the fixed part to change the mesh size or pitch of the support tube.

[0009] In combination 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.

[0010] In combination with the first possible implementation of the first aspect, the present invention 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 smaller than the pitch at the proximal end.

[0011] In combination with the first aspect, the present invention provides a fifth possible implementation of the first aspect, wherein the support tube is formed by winding a metal wire, or the support tube is formed by carving a metal tube.

[0012] In combination with the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the hardness of the distal end of the support tube is less than the hardness of the proximal end.

[0013] In combination with the first aspect, the present invention provides a seventh possible implementation manner of the first aspect, wherein the wall thickness of the distal end of the support tube is smaller than the wall thickness of the proximal end.

[0014] In combination with the first aspect, the present invention 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 accommodating area at the distal end of the outer tube body.

[0015] In a second aspect, the present invention provides a surgical instrument comprising: a working part, a transmission part, a handle and the medical catheter described in the first aspect;

[0016] The working part is slidably inserted in 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.

[0017] In combination with the second aspect, the present invention provides a first possible implementation of the second aspect, wherein the handle comprises: a core rod and a slider slidably matched 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 combination with the first possible implementation of the second aspect, the present invention provides a second possible implementation of the second aspect, wherein the transmission part includes: a connecting pipe and a cable;

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

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

[0022] In combination with the second possible implementation manner of the second aspect, the present invention provides a third possible implementation manner of the second aspect, wherein the surface of the cable is coated with a lubricating coating.

[0023] In combination with the second aspect, the present invention provides a fourth possible implementation of the second aspect, wherein the working portion comprises a ring having an elastic tendency to expand radially.

[0024] In a third aspect, the present invention provides a method for processing a medical catheter, comprising the following steps:

[0025] Installing a support tube inside the outer tube body;

[0026] Wherein, the support tube has a mesh structure or a spiral structure extending along the inner wall of the outer tube body.

[0027] In combination with the third aspect, the support tube has a fixed portion fixed relative to the outer tube body, and a movable portion movable relative to the support tube;

[0028] The medical catheter processing method further includes: adjusting the movable part to move relative to the fixed part to change the mesh size or pitch of the support tube.

[0029] The embodiments of the present invention bring the following beneficial effects: the support tube is installed inside the outer tube body and extends along the inner wall of the outer tube body, which not only enables the medical catheter to bend and pass through the curved channel easily, but also maintains better support when the outer tube body has a smaller diameter and a thinner wall thickness, and is particularly suitable for surgical instruments inserted through narrow forceps channels.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of a surgical instrument provided by an embodiment of the present invention in a state where the working part is released;

[0033] Figure 2 A schematic diagram of a surgical instrument provided by an embodiment of the present invention with the working portion in a retracted state;

[0034] Figure 3 A schematic diagram of a first support tube for a medical catheter provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of a second support tube for a medical catheter provided by an embodiment of the present invention;

[0036] Figure 5A schematic diagram of a third support tube for a medical catheter provided by an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of a fourth support tube for a medical catheter provided by an embodiment of the present invention;

[0038] Figure 7 A schematic diagram of a fifth support tube for a medical catheter provided in an embodiment of the present invention;

[0039] Figure 8 A schematic diagram of a sixth support tube for a medical catheter provided by an embodiment of the present invention;

[0040] Fig. 9 A schematic diagram of a seventh support tube for a medical catheter provided in an embodiment of the present invention;

[0041] Fig.10 A schematic diagram of a state of an eighth support tube of a medical catheter provided by an embodiment of the present invention;

[0042] Fig.11 A schematic diagram of another state of the eighth supporting tube of the medical catheter provided by an embodiment of the present invention;

[0043] Fig.12 A schematic diagram of a state of a ninth support tube of a medical catheter provided by an embodiment of the present invention;

[0044] Fig.13 A schematic diagram of another state of the ninth supporting tube of the medical catheter provided by an embodiment of the present invention.

[0045] Icons: 100 - outer tube body; 101 - instrument accommodating area; 200 - support tube; 201 - fixed part; 202 - movable part; 300 - working part; 400 - transmission part; 410 - connecting tube; 420 - cable; 500 - handle; 510 - core rod; 520 - slider. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, "proximal" and "distal" are referenced to the operator or the operating handle to obtain the corresponding orientation reference. "First", "second" and "third" are only used to describe the difference in names, and cannot be understood as indicating or implying relative importance. The physical quantities in the formula, if not separately marked, should be understood as basic quantities of the basic units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected 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.

[0049] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the medical catheter provided by the embodiment of the present invention 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.

[0050] Specifically, the outer tube body 100 is made of polytetrafluoroethylene (PTFE) or polyperfluoroethylene propylene (FEP) and has heat and pressure resistance. When the outer diameter and wall thickness of the outer tube body 100 are reduced, 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.

[0051] Furthermore, the support tube 200 includes a mesh structure or a spiral structure that is attached to the inner wall of the outer tube body 100 .

[0052] In an optional embodiment, the support tube 200 may be processed into a mesh structure with a specific mesh density, or the support tube 200 may be processed into a spiral structure with a specific pitch.

[0053] It should be noted that the mesh density of the support tube 200 mainly refers to the number of meshes within a certain size range in the axial direction of the support tube 200. As the mesh density increases, the number of meshes within a certain size in the axial direction of the support tube 200 increases.

[0054] like Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown, in the embodiment of the present invention, the support tube 200 has a fixed portion 201 fixed relative to the outer tube body 100, and a movable portion 202 movable relative to the outer tube body 100; the movable portion 202 moves relative to the fixed portion 201 to change the pitch of the support tube 200 or the mesh size of the support tube 200 in the axial direction. 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 of the support tube 200 in the axial direction, the hollow structure of the support tube 200 increases within a certain length range, making the support tube 200 easier to bend, so that the medical catheter can be more suitable for insertion through a curved endoscopic forceps channel. See Fig.10 and Fig.12 In the initial state, the spiral structure of the support tube 200 maintains a certain pitch density. When the movable portion 202 moves away from the fixed portion 201, thereby pulling the support tube 200 to extend, Fig.11 and Fig.13 , the gap of the spiral structure increases and the pitch increases, and the support tube 200 is easier to bend.

[0055] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As 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 dense mesh, or the pitch of the distal end of the support tube 200 is smaller and the spiral hollow part is more compact, so that the distal end of the support tube 200 is easy to bend and turn.

[0056] In an optional embodiment, the mesh density at the distal end of the support tube 200 is greater than the mesh density at the proximal end, or the pitch at the distal end of the support tube 200 is less than the pitch at the proximal end. The mesh size or pitch of the distal end of the support tube 200 along its own axial direction is greater than or equal to 0.03mm, and the mesh size or pitch of the proximal end of the support tube 200 along its own axial direction is greater than or equal to 0.3mm. Among them, a smaller pitch or grid structure is used in the range of 1mm to 100mm at the distal end of the support tube 200, or in the range of 1mm to 500mm, the distal end has a smaller pitch or a larger mesh density, and the pores are densely distributed, which is easier to bend and easier to pass through the endoscope curve; the proximal end has a larger pitch or a smaller mesh density, and the pores are sparsely distributed, so the support performance is better and it is easier to push.

[0057] like Fig. 9 As shown, in an optional embodiment, the hardness of the distal end of the support tube 200 can be made smaller than the hardness of the proximal end, which can also improve the bending performance of the distal end of the support tube 200.

[0058] like Figure 8 As shown, in an optional embodiment, the wall thickness of the distal end of the support tube 200 is smaller than that of the proximal end. The distal end of the support tube 200 has a thinner wall thickness, which is easier to bend; the proximal end of the support tube 200 has a thicker wall thickness, which provides better support.

[0059] See also Figure 3 In an optional embodiment, the support tube 200 may be formed by winding a metal wire.

[0060] See also Figure 4 and Figure 5 In another optional embodiment, the support tube 200 may be formed by carving a metal tube, and a spiral carving or mesh carving may be performed along the side wall of the metal tube to form a spiral structure or a mesh structure.

[0061] 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 a direction pointing 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 accommodating area 101 at the distal end of the outer tube body 100. On the one hand, sufficient space is reserved for the instrument accommodating area 101, and on the other hand, the resistance of the working part 300 to be released toward the distal end is reduced, and the working part 300 can be more easily retracted into the instrument accommodating area 101.

[0062] like Figure 1 and Figure 2As shown, the surgical instrument provided by the embodiment of the present invention includes: a working part 300, a transmission part 400, a handle 500 and the medical catheter recorded in the above-mentioned embodiment; the working part 300 is slidably inserted in 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.

[0063] The handle 500 transmits thrust and pull through the transmission part 400 , thereby pushing the working part 300 to be released from the distal end of the outer tube body 100 , and also pulling the working part 300 to be retracted from the distal end of the outer tube body 100 into the inner part of the outer tube body 100 .

[0064] In an optional embodiment, the handle 500 includes: a core rod 510 and a slider 520 that slidably matches 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 on the core rod 510, and the slider 520 is operated to slide relative to the core rod 510, so that the transmission part 400 can be pushed and pulled, thereby realizing the release and recovery of the working part 300.

[0065] In an optional embodiment, the transmission part 400 includes: a connecting tube 410 and a cable 420; the connecting tube 410 is slidably fitted in the outer tube body 100, and the connecting tube 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. The connection between the connecting tube 410 and the working part 300, and the connection between the connecting tube 410 and the cable 420 can be welded or riveted, etc. The cable 420 is loosely fitted in the medical catheter, and the cable 420 is pushed or pulled by the slider 520 to transmit thrust or pull, thereby achieving the release and recovery of the working part 300.

[0066] Furthermore, the cable 420 is made of stainless steel, nickel titanium or other materials, and can be configured as a monofilament structure or a cable structure, and is flexible. The surface of the cable 420 is coated with a lubricating coating, which can reduce the friction resistance of the cable 420 in the medical catheter, thereby making the release and recovery operations of the working part 300 easier.

[0067] Furthermore, the working part 300 includes a ferrule, which has an elastic tendency to expand radially. The ferrule can be made of materials such as stainless steel, nickel titanium, etc., or a mixed structure of multiple materials, and can be configured as a diamond structure, an elliptical structure, or a hexagonal structure in the expanded state.

[0068] The medical catheter processing method provided by the embodiment of the present invention comprises the following steps:

[0069] A support tube 200 is installed inside the outer tube body 100;

[0070] The support tube 200 has a mesh structure or a spiral structure extending along the inner wall of the outer tube body 100 .

[0071] The medical catheter obtained by the processing method has improved structural strength and support through the support tube 200 when the outer diameter of the outer tube body 100 is reduced and the wall thickness is thinned, and can be inserted along the curved endoscope channel, which is particularly suitable for use in narrow endoscope channels.

[0072] In an optional embodiment, the support tube 200 may have a fixed portion 201 fixed relative to the outer tube body 100, and a movable portion 202 movable relative to the support tube 200; the medical catheter processing method also includes: adjusting the movable portion 202 to move relative to the fixed portion 201 to change the mesh size or pitch of the support tube 200, and by moving the movable portion 202 relative to the fixed portion 201 along the axial direction of the support tube 200, the mesh size or pitch in the axial direction of the support tube 200 changes accordingly, thereby changing the bending resistance and support performance of the support tube 200, and then the flexibility and support of the support tube 200 can be adjusted as needed. When the bending degree of the endoscope 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 easy to bend, thereby making the insertion of surgical instruments smoother.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A medical catheter, characterized in that: include: 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).

2. The medical catheter according to claim 1, characterized in that: The support tube (200) comprises a mesh structure or a spiral structure that is attached to the inner wall of the outer tube body (100).

3. The medical catheter according to claim 2, characterized in that: The support tube (200) comprises a fixed portion (201) fixed relative to the outer tube body (100), and a movable portion (202) movable relative to the outer tube body (100); The movable part moves relative to the fixed part to change the mesh size or pitch of the support tube (200).

4. The medical catheter 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 medical catheter according to claim 2, characterized in that: The mesh density at the distal end of the support tube (200) is greater than the mesh density at the proximal end, or the pitch at the distal end of the support tube (200) is smaller than the pitch at the proximal end.

6. The medical catheter according to claim 1 or 2, characterized in that: The support tube (200) is formed by winding a metal wire, or the support tube (200) is formed by carving a metal tube.

7. The medical catheter according to claim 1, characterized in that: The hardness of the distal end of the support tube (200) is smaller than the hardness of the proximal end.

8. The medical catheter according to claim 1, characterized in that: The wall thickness of the distal end of the support tube (200) is smaller than the wall thickness of the proximal end.

9. The medical catheter 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 accommodating area (101) at the distal end of the outer tube body (100).

10. A surgical instrument, characterized in that: include: A working part (300), a transmission part (400), a handle (500), and a medical catheter as claimed in any one of claims 1 to 9; 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).

11. The surgical instrument according to claim 10, characterized in that: The handle (500) comprises: a core rod (510) and a slider (520) slidably matched 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).

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

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

14. The surgical instrument according to claim 10, characterized in that: The working part (300) comprises a collar having an elastic tendency to expand radially.

15. A method for processing a medical catheter, characterized in that: The following steps are involved: A support tube (200) is installed inside the outer tube body (100); Wherein, the support tube (200) extends along the inner wall of the outer tube body (100).

16. The medical catheter processing method according to claim 15, characterized in that: The support tube (200) comprises a fixed portion fixed relative to the outer tube body (100), and a movable portion movable relative to the support tube (200); The medical catheter processing method further comprises: adjusting the movable part to move relative to the fixed part to change the mesh size or pitch of the support tube (200).

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