WO2023093366A1

WO2023093366A1 - Instrument tube and endoscope

Info

Publication number: WO2023093366A1
Application number: PCT/CN2022/125751
Authority: WO
Inventors: 周冠华; 莫文军; 唐鹏
Original assignee: 湖南省华芯医疗器械有限公司
Priority date: 2021-11-29
Filing date: 2022-10-17
Publication date: 2023-06-01
Also published as: CN216394011U

Abstract

An instrument tube and an endoscope. The instrument tube comprises a first tube body section (1). The first tube body section (1) comprises an inner protective layer (11), a support layer (12) covering the inner protective layer (11), and an outer protective layer (13) covering the support layer (12), wherein the hardness of the support layer (12) is greater than the hardness of the inner protective layer (11) and the hardness of the outer protective layer (13). Under the joint action of the outer protective layer (13) and the inner protective layer (11), the support layer (12) is wrapped in the tube body of the first tube body section (1) of the instrument tube, so that the tube body of the instrument tube section covered with the support layer (12) has a support function; and when the instrument tube is bent, the bent position of the instrument tube can achieve smooth transition, and the bent position of the instrument tube would not collapse, so that an instrument can smoothly pass through an instrument channel tube.

Description

Instrument tube and endoscope

technical field

The utility model relates to an endoscope, in particular to an instrument tube and the endoscope.

Background technique

Endoscope is a commonly used medical device, which can directly enter the natural pipeline of the human body, and can provide doctors with sufficient diagnostic information to treat diseases. When in use, the insertion part of the endoscope enters the human body through the natural orifice of the human body or through a small incision made by surgery, and the doctor can directly observe the changes of the relevant parts. There is an instrument channel tube in the insertion part of the endoscope, and an instrument inlet is provided on the handle of the endoscope, and medical instruments (biopsy forceps, grasping forceps, scissors, etc.) can enter the instrument channel of the endoscope through the instrument inlet into the tube and into the field of view, through the medical instrument for biopsy sampling, etc.

The instrument passage tube of the existing endoscope is only made of common Teflon tube, which is a single-layer structure. The end of the endoscopic catheter is equipped with an active bending section and a passive bending section. When entering the human body, the bending angle of these two parts is the largest. When the instrument tube is a single-layer structure, the instrument channel tube cannot be smoothly bent at the active bending section and the passive bending section. , or the instrument channel tube is prone to collapse when bent, resulting in the inability of the instrument to pass through. Moreover, the cost of traditional instrument channel tubes is relatively high, and the cost of discarding disposable endoscopes after one use is higher.

Utility model content

In order to solve the above problems, the purpose of the first aspect of the utility model is to provide an instrument tube, the instrument tube includes a first tube body section, the first tube body section includes an inner sheath, and covers the inner sheath The support layer of the layer, the outer sheath covering the support layer; the hardness of the support layer is greater than the hardness of the inner sheath and the hardness of the outer sheath.

Further, the outer sheath and/or the inner sheath are made of plastic.

Further, the support layer is helical or mesh-shaped.

Further, the support layer is made of metal.

Further, the inner sheath, the supporting layer and the outer sheath are connected together through an integral molding process.

Further, the lengths of the support layers are both shorter than the lengths of the inner sheath and the outer sheath.

Further, the length of the inner sheath is shorter than the length of the outer sheath, and the inner sheath and the support layer are located at the distal section of the instrument tube.

Further, the instrument tube further includes a second tube body section, the second tube body section is a single-layer tube, and the second tube body section is integrally connected to the proximal end of the first tube body section.

Further, a connection section is provided at the proximal end of the inner sheath, and the second tube body section is integrally connected with the connection section.

The second aspect of the present invention provides an endoscope, which includes a handle part and an insertion part, and the aforementioned instrument tube is arranged in the insertion part.

Compared with the prior art, the beneficial technical effect of the utility model is:

1) In the instrument tube of the present invention, under the joint action of the outer sheath and the inner sheath, the support layer is wrapped in the body of the first body section of the instrument tube, and the body of the instrument tube section covered with the support layer has Higher strength has a supporting effect on the tube body; when the instrument tube section covered with the support layer is bent, the bend of the instrument tube can be smoothly transitioned, so that the bend of the instrument tube will not collapse, and the instrument can Pass through the instrument channel tube smoothly, and perform biopsy sampling through medical instruments.

2) The utility model is set longer by both ends of the inner sheath and the outer sheath, and an inner sheath and an outer sheath of a certain length are left at both ends of the support layer, so that the inner sheath, the outer sheath When the outer sheath and the support layer are integrally formed, the outer sheath will partially infiltrate into the gap of the support layer, and the inner sheath and the outer sheath at both ends of the support layer are directly bonded together, so that the support layer can be completely wrapped in the inner sheath. layer and outer sheath.

3) The utility model can not only reduce the material of the support layer and the inner protective layer by positioning the inner sheath and the support layer at the distal end section of the instrument tube, but also save costs, and at the same time have enough Excellent bending strength, will not collapse when bent.

4) The utility model connects the second pipe body section with the connection section integrally by reserving a section of inner sheath (that is, the connecting section) at the proximal end of the first pipe body section, so as to ensure that the first pipe body section and the connecting section The firmness of the connection of the second pipe body segment.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the utility model or the description of the prior art. Obviously, the accompanying drawings described below are only the present invention. For some embodiments of the utility model, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of an instrument tube in an embodiment of the present invention;

Fig. 2 is another embodiment of the utility model, a structural schematic view of the inner sheath and the support layer located at the distal end of the instrument tube;

Fig. 3 is another embodiment of the utility model, a schematic structural view of the first pipe body section;

Fig. 4 is another embodiment of the utility model, a schematic structural view of the second pipe body section matched with the first pipe body section shown in Fig. 3;

Fig. 5 is a schematic view of the device tube structure after connecting the first body section in Fig. 3 and the second body section in Fig. 4;

In the figure: 1-first pipe body section, 11-inner sheath, 111-connecting section, 12-support layer, 13-outer sheath, 2-second pipe body.

Detailed ways

The following description provides many different embodiments, or examples, for implementing different features of the present invention. The elements and arrangements described in the following specific examples are only used to express the utility model in a concise manner, which are only examples and not intended to limit the utility model.

In the prior art, a conventional endoscope includes an operating part (also referred to as a handle) and an insertion part. The handle part is used for manipulating the insertion part to enter the human body. Wherein, the insertion part can be divided into an active bending section, a passive bending section, and an insertion pipe section. By controlling the bending of the active bending section, the handle part drives the bending of the passive bending section, so as to realize the direction control of the insertion part in the cavity of the human body.

At the same time, an instrument passage tube (instrument tube for short) is provided in the insertion part of the endoscope, and an instrument entrance is provided on the handle of the endoscope, and medical instruments (biopsy forceps, grasping forceps, scissors, etc.) can enter through the instrument entrance. Into the instrument tube of the endoscope, the camera at the far end of the insertion part enters the field of view, and biopsy sampling is performed through medical instruments.

The instrument channel tube of the existing endoscope is usually made of a single-layer Teflon tube, wherein the Teflon tube is made of Teflon material extruded and sintered, then dried, high-temperature sintered, and shaped. Specialty pipes. However, during the process of the flexible insertion part of the endoscope entering the human cavity.

When the insertion part of the endoscope enters the human body, the bending angle of the active bending section and the passive bending section is the largest. When the instrument channel tube has a single-layer structure, the instrument channel tube cannot be smoothly bent at the active bending section and the passive bending section. , or the instrument channel tube is prone to collapse when it is bent, making it impossible for the instrument to pass through smoothly. Disposable endoscopes will be discarded as a whole after being used once, and the cost of traditional instrument channel tubes is high, which will lead to high disposal costs of disposable endoscopes, which is not conducive to environmental protection.

It needs to be explained in advance that the "distal end" and "near end" in the present invention are relative to the handle part of the endoscope, and the end closer to the handle part of the endoscope is called the "near end". ", the end farther from the handle of the endoscope is called the "distal end"

In view of this, an embodiment of the present invention, as shown in FIG. 1 , provides an instrument tube, the instrument tube includes a first tube body segment 1, and the first tube body segment 1 includes an inner sheath 11, The support layer 12 covering the inner sheath 11 and the outer sheath 13 covering the support layer 12 ; the hardness of the support layer 12 is greater than the hardness of the inner sheath 11 and the hardness of the outer sheath 13 .

In the prior art, the conventional instrument tube has a single-layer structure, usually a single-layer Teflon tube. When the bending angle of the insertion part of the endoscope is large, the bending angle of the instrument tube in the prior art The place is prone to collapse, blocking the instrument channel, making it impossible for surgical instruments to pass through the instrument tube smoothly.

In this embodiment, the inner sheath 11 constitutes at least part of the inner wall surface of the first pipe body section 1, and it is integrated with the outer sheath 13 to wrap the support layer 12 therein; and the first pipe body section can be added 1 tightness. The instrument tube can be used as a water inlet and outlet channel at the same time.

Since the hardness of the support layer 12 is greater than that of the inner sheath 11, when the support layer 12 covers the outer peripheral surface of the inner sheath 11, the tube body of the instrument tube section covered with the support layer 12 has a higher strength, It has a supporting effect on the tube body; when the instrument tube section covered with the support layer 12 is bent, the bend of the instrument tube can be smoothly transitioned, so that the bend of the instrument tube will not collapse, and the instrument can smoothly pass through the instrument channel. Tubes are threaded, biopsy samples are passed through medical instruments, etc.

The outer sheath 13 constitutes the outer wall of the first pipe body section 1 ; therefore, the length of the outer sheath 13 is equal to the length of the first pipe body section 1 . The outer sheath 13 can not only protect the supporting layer 12 and the inner sheath 11 located in the inner layer, but also has the functions of soft flame retardant, insulation and anticorrosion, and it is soft enough to be easily inserted into the tube with the endoscope. into the corresponding parts of the human body.

In the above solution, under the joint action of the outer sheath 13 and the inner sheath 11, the supporting layer 12 is wrapped in the first pipe body section 1, so as to achieve the technical effect of enhancing the strength of the first pipe body section 1. In this way, when the first pipe body section 1 is bent, the first pipe body section 1 can transition smoothly without collapsing.

In practical applications, the first tube body section 1 can be used as the entire tube body of the instrument tube, so that the entire instrument tube has a strong ability to resist collapse; the first tube body section 1 can also be used as an instrument tube that will produce a large bend The tube body of the tube section and the tube body of the rest of the instrument tube are conventional single-layer tube bodies, which can reduce the cost of the instrument tube.

Further, the outer sheath 13 and/or the inner sheath 11 are made of plastic.

In the above solution, the materials of the inner sheath 11 and the outer sheath 13 can be the same or different.

The materials of the outer sheath 13 and the inner sheath 11 can be any one of materials such as TPE, TPU, PU, PTFE, LDPE, HDPE, PEBAX, PE, EVA, PVC, PET, etc. Plastic materials that are non-toxic and harmless to the human body are not limited here.

Preferably, the inner sheath 11 and the outer sheath 13 can be bonded together under the action of heat shrinkage process.

Preferably, the material of the inner sheath 11 is PTFE (Teflon), and the material of the outer sheath 13 is PEBAX.

Further, the support layer 12 is helical or mesh-shaped.

When the support layer 12 is helical, the hardness of the support layer 12 can be controlled by controlling the size of the pitch, so as to form a good support for the instrument tube. For example, by setting the pitch to be smaller, the hardness of the support layer 12 is higher.

When the support layer 12 is a mesh, the hardness of the support layer 12 can be controlled by controlling the density of the mesh, so as to form a good support for the instrument tube. For example, the grid can be set denser, so that the hardness of the support layer 12 is higher. in. Wherein the mesh support layer 12 is preferably a round wire braided tube or a flat wire braided tube.

Further, the support layer 12 is made of metal.

Preferably, if the support layer 12 is a braided mesh tube made of metal, the material of the braided mesh tube can be one of stainless steel, nickel titanium, copper, and aluminum.

Preferably, the support layer 12 is a metal threaded pipe, and the material of the threaded pipe can be one of stainless steel, nickel titanium, copper, and aluminum.

Further, in order to enhance the integrity of the instrument tube body, the inner sheath 11 , the support layer 12 and the outer sheath 13 are connected together through an integral molding process.

Specifically, taking the material of the inner sheath 11 as PTFE as an example, the material of the support layer 12 as a metal flat wire mesh pipe, and the material of the outer sheath 13 as PEBAX as an example, when processing the first pipe body section 1, a core Put the PTFE tube on the rod, and then install it on the winding machine, and wind the flat wire mesh tube on the outer wall of the PTFE tube. Then cover the PEBAX tube on the outer wall of the flat wire mesh layer, and then cover the outer wall of the PTFE tube with a heat-shrinkable tube to heat the heat-shrinkable tube so that the heat-shrinkable tube shrinks. Under the action of the heat-shrinkable tube, the PEBAX melts into the into the gap of the metal flat wire mesh tube, so that the PEBAX tube of the outer sheath 13 and the PTFE tube of the inner sheath 11 are melted and bonded, and the heat shrinkable tube is removed to wrap the support layer 12.

In this way, the inner sheath 11, the support layer 12 and the outer sheath 13 form a whole, and the support layer 12 forms a good support for the tube wall of the first tube body section 1, ensuring that the first tube body section 1 of the instrument tube It will not collapse when bent, ensuring that the lumen of the instrument tube channel has enough space for the instrument to pass through.

In one embodiment of the present invention, as shown in FIG. 1 and FIG. 2 , the length of the support layer 12 is both shorter than the length of the inner sheath 11 and the length of the outer sheath 13 .

When it is necessary to make each part of the first pipe body section 1 have anti-collapse ability, it is necessary to arrange the supporting layer 12 on the entire pipe body of the first pipe body section 1 . Therefore, at this time, the length of the inner sheath 11 , the length of the outer sheath 13 , the length of the supporting layer 12 and the length of the first pipe body section 1 are all equal.

But at this time, at the end of the first pipe body section 1 , the end surface of the supporting layer 12 will leak out. In order to realize that the support layer 12 is completely wrapped between the inner sheath 11 and the outer sheath 13, so as to avoid leakage from both ends of the support layer 12, both ends of the inner sheath 11 and the outer sheath 13 can be The setting is longer, that is, an inner sheath 11 and an outer sheath 13 of a certain length are left at both ends of the support layer 12 . Therefore, when the inner sheath 11, the outer sheath 13 and the support layer 12 are integrally formed, the inner sheath 11 and the outer sheath 13 at both ends of the support layer 12 are directly bonded together, so that the support layer 12 is completely wrapped in the inner sheath Between layer 11 and outer sheath 13.

In one embodiment of the present invention, as shown in FIG. 2, the length of the inner sheath 11 is shorter than the length of the outer sheath 13, and the inner sheath 11 and the support layer 12 are positioned at the the distal end of the tube.

The purpose of this embodiment is to reduce the cost of the instrument tube. Since the distal end section of the instrument tube is bent at a relatively large angle, the possibility of collapse is high. Therefore, it is necessary to use the aforementioned first tube body section 1 with a multi-layer structure at the distal end section of the instrument tube. In the proximal section of the instrument tube, since the bending angle is small, the possibility of collapse is low, so only a conventional single-layer structure can be used in the proximal section of the instrument tube, that is, only the outer sheath 13 .

It can be understood that, in order to make the overall thickness of the instrument tube body consistent, the thickness of the outer sheath 13 in the above solution is changed. At the distal end of the instrument tube, the thickness of the outer sheath 13 is smaller, and at the proximal end of the instrument tube, the thickness of the outer sheath 13 is greater.

This design can not only reduce the materials of the support layer 12 and the inner sheath 11 and save costs, but also has sufficient bending strength at the distal end of the instrument tube, so that it will not collapse when bent.

In one embodiment of the present utility model, as shown in Fig. 3 to Fig. 5, the instrument tube further includes a second tube body segment 2, the second tube body segment 2 is a single-layer tube, and the second tube body The body segment 2 is integrally connected with the proximal end of the first tubular body segment 1 .

In the above solution, the material of the second pipe body section 2 can be set to be the same as that of the outer sheath 13 of the first pipe body section 1 . The second tube body segment 2 is integrally connected to the proximal end of the first tube body segment 1 to form a complete instrument tube. This design can not only reduce the materials of the support layer 12 and the inner sheath 11 and save costs, but also has sufficient bending strength at the distal end of the instrument tube, so that it will not collapse when bent.

Further, as shown in Figure 3, the proximal end of the inner sheath 11 is provided with a connection section 111, and the second tube body section 2 is integrally connected with the connection section 111.

In the above scheme, in order to realize the integrated connection between the second tube body segment 2 and the proximal end of the first tube body segment 1, a section of inner sheath 11, that is, the connecting segment 111, is reserved at the proximal end of the first tube body segment 1. The second pipe body section 2 is integrally connected with the connection section 111 .

For example, the outer sheath 13 of the first pipe body section 1 is a heat-shrinkable tube or PEBAX, and the inner sheath 11 is a PTFE (Teflon tube), then the material of the second pipe body section 2 is a heat-shrinkable tube. A Teflon tube is reserved at the proximal end of the tube body section 1, and the heat-shrinkable tube of the second tube body section 2 can be thermally connected to the reserved Teflon tube. Of course, for the outer sheath 13 and the inner The material of the sheath 11 can also be other materials, which are not limited here.

Another embodiment of the present utility model provides an endoscope, the endoscope includes a handle part and an insertion part, and the aforementioned instrument tube is arranged in the insertion part.

For the instrument tube in the endoscope in the above solution, due to the supporting effect of the support layer 12 on the instrument tube body, when the instrument tube section covered with the support layer 12 is bent, the bend of the instrument tube can be smoothly transitioned, so that the instrument tube The bending part of the tube will not collapse, so the instrument can smoothly pass through the instrument channel tube, and biopsy sampling can be performed through the medical instrument.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the Within the protection scope of the present utility model.

Claims

An instrument tube, characterized in that it comprises a first tube body segment (1), and the first tube body segment (1) includes an inner sheath (11), a support layer covering the inner sheath (11) ( 12), covering the outer sheath (13) of the support layer (12); the hardness of the support layer (12) is greater than the hardness of the inner sheath (11) and the hardness of the outer sheath (13) .
The instrument tube according to claim 1, characterized in that, the outer sheath (13) and/or the inner sheath (11) is made of plastic material.
The instrument tube according to claim 2, characterized in that, the support layer (12) is helical or mesh-shaped.
The instrument tube according to claim 3, characterized in that, the support layer (12) is made of metal.
The instrument tube according to claim 4, characterized in that, the inner sheath (11), the support layer (12) and the outer sheath (13) are connected together through an integral molding process.
The instrument tube according to claim 2, characterized in that, the length of the support layer (12) is both shorter than the length of the inner sheath (11) and the length of the outer sheath (13).
The apparatus tube according to claim 2, characterized in that, the length of the inner sheath (11) is less than the length of the outer sheath (13), and the inner sheath (11) and the support layer ( 12) Located at the distal section of the instrument tube.
The instrument tube according to claim 2, characterized in that, the instrument tube also includes a second tube body segment (2), the second tube body segment (2) is a single-layer tube, and the second tube body The section (2) is integrally connected with the proximal end of the first tube body section (1).
The instrument tube according to claim 8, characterized in that, the proximal end of the inner sheath (11) is provided with a connecting section (111), and the second tube body section (2) is connected to the connecting section (111). ) connected in one piece.
An endoscope, characterized in that it comprises a handle part and an insertion part, and the instrument tube according to any one of claims 1-9 is arranged inside the insertion part.