CN216394011U

CN216394011U - Instrument tube and endoscope

Info

Publication number: CN216394011U
Application number: CN202122947874.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Hunan Vathin Medical Instrument Co Ltd
Current assignee: Hunan Vathin Medical Instrument Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-04-29
Anticipated expiration: 2031-11-29
Also published as: WO2023093366A1

Abstract

The utility model is suitable for the technical field of endoscopes, and provides an instrument tube and an endoscope; the instrument tube comprises a first tube body section, wherein the first tube body section comprises an inner protective layer, a supporting layer covering the inner protective layer and an outer protective layer covering the supporting layer; the hardness of the support layer is greater than the hardness of the inner sheath and the hardness of the outer sheath. According to the instrument tube, under the combined action of the outer protective layer and the inner protective layer, the supporting layer is wrapped in the tube body of the first tube body section of the instrument tube, and the tube body of the instrument tube section covered with the supporting layer has a supporting function; when the instrument tube section covered with the supporting layer is bent, the bent part of the instrument tube can be smoothly transited, so that the bent part of the instrument tube cannot collapse, the instrument can smoothly pass through the instrument channel tube, and biopsy sampling and the like are performed through a medical instrument.

Description

Instrument tube and endoscope

Technical Field

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

Background

An endoscope is a commonly used medical instrument, which can directly enter a natural duct of a human body to be inspected, and can provide sufficient diagnostic information for doctors to treat diseases. When in use, the inserting part of the endoscope enters the human body through the natural pore canal of the human body or a small incision made by operation, and a doctor can directly peep the change of the relevant part. An instrument passage tube is arranged in the insertion part of the endoscope, an instrument inlet is arranged on a handle of the endoscope, and medical instruments (biopsy forceps, graspers, scissors and the like) can enter the instrument passage tube of the endoscope through the instrument inlet and enter a visual field, and biopsy sampling and the like are carried out through the medical instruments.

The instrument channel tube of the existing endoscope is only made of a common Teflon tube and is of a single-layer structure. The end part of the endoscope guide pipe is provided with an active bending section and a passive bending section, the bending angles of the two parts are the largest when the endoscope guide pipe enters a human body, and when the instrument pipe is of a single-layer structure, the instrument channel pipe cannot be smoothly bent at the active bending section and the passive bending section, or the instrument channel pipe is easy to collapse when being bent, so that instruments cannot pass through. And the traditional instrument channel tube has higher manufacturing cost, and has higher cost compared with the disposable endoscope which is discarded once.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, it is an object of a first aspect of the present invention to provide an instrument tube, which comprises a first tube body segment including an inner sheath, a supporting layer covering the inner sheath, and an outer sheath covering the supporting 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 protection layer and/or the inner protection layer are made of plastic materials.

Further, the support layer is spiral or net-shaped.

Further, the supporting layer is made of metal.

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

Further, the length of the supporting layer is smaller than that of the inner protective layer and that of the outer protective layer.

Further, the inner sheath has a length less than the outer sheath, and the inner sheath and the support layer are located at a distal segment of the instrument tube.

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

Further, the near end of the inner sheath is provided with a connecting section, and the second pipe body section is integrally connected with the connecting section.

In a second aspect of the utility model, there is provided an endoscope comprising a handle portion and an insertion portion in which the aforementioned instrument tube is disposed.

Compared with the prior art, the utility model has the beneficial technical effects that:

1) according to the instrument tube, under the combined action of the outer protective layer and the inner protective layer, the supporting layer is wrapped in the tube body of the first tube body section of the instrument tube, and the tube body of the instrument tube section covered with the supporting layer has high strength and has a supporting effect on the tube body; when the instrument tube section covered with the supporting layer is bent, the bent part of the instrument tube can be smoothly transited, so that the bent part of the instrument tube cannot collapse, the instrument can smoothly pass through the instrument channel tube, and biopsy sampling and the like are performed through a medical instrument.

2) According to the utility model, the two ends of the inner protection layer and the outer protection layer are longer, and the inner protection layer and the outer protection layer with certain lengths are reserved at the two ends of the supporting layer, so that when the inner protection layer, the outer protection layer and the supporting layer are integrally formed, the outer protection layer can partially penetrate into a gap of the supporting layer, the inner protection layer and the outer protection layer at the two ends of the supporting layer are directly bonded together, and the supporting layer is completely wrapped between the inner protection layer and the outer protection layer.

3) According to the utility model, the inner protection layer and the supporting layer are positioned at the far end section of the instrument tube, so that the materials of the supporting layer and the inner protection layer can be reduced, the cost is saved, and meanwhile, the far end of the instrument tube has enough bending strength and cannot collapse when being bent.

4) According to the utility model, the second pipe body section and the connecting section are integrally connected by reserving the inner protection layer (namely the connecting section) at the near end of the first pipe body section, so that the firmness of connection of the first pipe body section and the second pipe body section is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of an instrument tube according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the inner sheath and the supporting layer at the distal section of the device tube according to another embodiment of the present invention;

FIG. 3 is a schematic view of a first tube segment according to another embodiment of the present invention;

FIG. 4 is a schematic view of a second tube segment in accordance with another embodiment of the present invention in cooperation with the first tube segment of FIG. 3;

FIG. 5 is a schematic illustration of the instrument tube configuration of FIG. 3 after the first and second tube segments are connected;

in the figure: 1-a first pipe body section, 11-an inner protection layer, 111-a connecting section, 12-a support layer, 13-an outer protection layer and 2-a second pipe body.

Detailed Description

The following description provides many different embodiments, or examples, for implementing different features of the utility model. The particular examples set forth below are illustrative only and are not intended to be limiting.

In the prior art, a conventional endoscope includes an operation portion (also referred to as a handle) and an insertion portion. The handle part is used for controlling the insertion part to enter a human body. The insertion part can be divided into an active bending section, a passive bending section and an insertion pipe section. The handle part drives the passive bending section to bend by controlling the bending of the active bending section, thereby realizing the direction control of the insertion part in the human body cavity.

Meanwhile, an instrument channel tube (instrument tube for short) is arranged in the insertion part of the endoscope, an instrument inlet is arranged on a handle of the endoscope, medical instruments (biopsy forceps, graspers, scissors and the like) can enter the instrument tube of the endoscope through the instrument inlet, a camera at the far end of the insertion part enters a visual field, and biopsy sampling and the like are carried out through the medical instruments.

An instrument channel tube of an existing endoscope is usually made of a single-layer teflon tube, wherein the teflon tube is a special tube made of polytetrafluoroethylene materials through processes of extrusion sintering, drying, high-temperature sintering, shaping and the like. However, during the process of the flexible insertion portion of the endoscope entering the body lumen.

When an insertion part of the endoscope enters a human body, the bending angles of the active bending section and the passive bending section are the largest, when the instrument channel tube is of 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 easy to collapse when being bent, so that an instrument cannot smoothly pass through. The disposable endoscope can be discarded integrally after being used once, and the traditional instrument channel tube has high manufacturing cost, so that the disposal cost of the disposable endoscope is high, and the disposable endoscope is not beneficial to environmental protection.

It should be noted that, in the present invention, the "distal end" and the "proximal end" are both relative to the handle portion of the endoscope, and the end closer to the handle portion of the endoscope is referred to as the "proximal end", and the end farther from the handle portion of the endoscope is referred to as the "distal end"

In view of this, one embodiment of the present invention, as shown in fig. 1, provides an instrument tube comprising a first tube segment 1, the first tube segment 1 comprising an inner sheath 11, a supporting layer 12 covering the inner sheath 11, an outer sheath 13 covering the supporting 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, a conventional instrument tube is of a single-layer structure, generally is a single-layer Teflon tube, and when the bending angle of an insertion part of an endoscope is large, the bending part of the instrument tube in the prior art is easy to collapse to block an instrument channel, so that a surgical instrument cannot smoothly pass through the instrument tube.

In the present embodiment, the inner sheath 11 constitutes an inner wall surface of at least a part of the pipe section of the first pipe section 1, and is integrally formed with the outer sheath 13 to enclose the support layer 12 therein; and the tightness of the first pipe section 1 can be increased. So that the apparatus tube can be used as a water inlet and outlet channel and the like.

Since the hardness of the supporting layer 12 is greater than that of the inner sheath 11, when the supporting layer 12 is covered on the outer peripheral surface of the inner sheath 11, the tube body of the instrument tube section covered with the supporting layer 12 has higher strength and has a supporting effect on the tube body; when the section of the instrument tube covered with the supporting layer 12 is bent, the bent part of the instrument tube can be smoothly transited, so that the bent part of the instrument tube cannot collapse, and the instrument can smoothly pass through the instrument channel tube and perform biopsy sampling and the like through a medical instrument.

The outer jacket 13 constitutes the outer wall surface of the first pipe section 1; the length of the outer jacket 13 is equal to the length of the first pipe segment 1. The outer protective layer 13 can protect the supporting layer 12 and the inner protective layer 11 which are positioned in the inner layer, and the outer protective layer 13 has the functions of softness, flame retardance, insulation and corrosion prevention, is soft enough and is convenient to stretch into corresponding parts of a human body along with an endoscope insertion tube.

In the above scheme, under the combined action of the outer sheath 13 and the inner sheath 11, the support layer 12 is wrapped in the pipe body of the first pipe body section 1, so that the technical effect of enhancing the strength of the pipe body of the first pipe body section 1 is achieved. So that the first pipe section 1 can be smoothly transitioned without collapse when the first pipe section 1 is bent.

In practical application, the first tube body section 1 can be used as the whole tube body of the instrument tube, so that the whole instrument tube has stronger collapse resistance; the first tube section 1 can also be used as a tube body of a tube section of the instrument tube, which can generate larger bending, and the tube body of the rest part of the instrument tube is a conventional single-layer tube body, so that the cost of the instrument tube can be reduced.

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

In the above embodiment, the inner sheath 11 and the outer sheath 13 may be made of the same material or different materials.

The outer sheath layer 13 and the inner sheath layer 11 may be made of any one of TPE, TPU, PU, PTFE, LDPE, HDPE, PEBAX, PE, EVA, PVC, PET, or other plastic materials that are nontoxic and harmless to the human body, and are not limited herein.

Preferably, the inner sheath 11 and the outer sheath 13 are bonded together by a heat shrinking 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 spiral or net-shaped.

When the support layer 12 is helical, the hardness of the support layer 12 can be controlled by controlling the size of the helical pitch to provide good support for the device tube. Such as by providing the pitch smaller, the stiffness of the support layer 12 is made 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 to provide good support for the device tube. Such as the mesh may be placed more densely so that the support layer 12 is stiffer. Wherein. Wherein the net-like supporting layer 12 is preferably a braided tube of round filaments or a braided tube of flat filaments.

Further, the support layer 12 is made of metal.

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

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

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

Specifically, when the inner protective layer 11 is made of PTFE, the support layer 12 is made of a metal flat mesh tube, and the outer protective layer 13 is made of PEBAX, a PTFE tube is sleeved on a mandrel bar during processing of the first pipe section 1, and then the PTFE tube is wound around the outer wall of the PTFE tube by a flat mesh tube winding machine after being mounted on a winding machine. And then covering a PEBAX pipe on the outer wall of the flat wire mesh layer, sleeving a heat-shrinkable pipe on the outer wall of the PTFE pipe, heating the heat-shrinkable pipe to ensure that the heat-shrinkable pipe is subjected to heat shrinkage, fusing the PEBAX into the gap of the metal flat wire mesh pipe under the action of the heat-shrinkable pipe to ensure that the PEBAX pipe of the outer protective layer 13 is subjected to heat melting and bonding with the PTFE pipe of the inner protective layer 11, and removing the heat-shrinkable pipe to wrap the supporting layer 12.

Therefore, the inner protection layer 11, the support layer 12 and the outer protection layer 13 form a whole, and the support layer 12 forms a good support for the pipe wall of the first pipe section 1, so that the first pipe section 1 of the instrument pipe is prevented from collapsing during bending, and the inner cavity of the pipe of the instrument pipe is ensured to have enough space for instruments to pass through.

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

When it is necessary to provide each part of the first pipe section 1 with anti-collapse capability, the supporting layer 12 needs to be provided on the entire pipe body of the first pipe section 1. Therefore, at this time, the length of the inner sheath 11, the length of the outer sheath 13, the length of the support layer 12, and the length of the first pipe section 1 are equal.

However, at this time, the end surface of the support layer 12 at the end of the first pipe section 1 may leak out. In order to completely wrap the supporting layer 12 between the inner protective layer 11 and the outer protective layer 13 and avoid the two end faces of the supporting layer 12 from leaking outside, the two ends of the inner protective layer 11 and the two ends of the outer protective layer 13 may be longer, that is, the inner protective layer 11 and the outer protective layer 13 with a certain length are left at the two ends of the supporting layer 12. Thus, when the inner protection layer 11, the outer protection layer 13 and the support layer 12 are integrally formed, the inner protection layer 11 and the outer protection layer 13 at two ends of the support layer 12 are directly bonded together, so that the support layer 12 is completely wrapped between the inner protection layer 11 and the outer protection layer 13.

In one embodiment of the utility model, as shown in FIG. 2, the length of the inner sheath 11 is less than the length of the outer sheath 13, with the inner sheath 11 and the support layer 12 being located on the distal segment of the device tube.

The object 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 large angle and is likely to collapse, the first tube section 1 having the aforementioned multilayer structure is required to be used as the distal end section of the instrument tube. In the proximal section of the instrument tube, because the bending angle is small, the collapse possibility is low, so that only the conventional single-layer structure, namely only the outer sheath 13, can be adopted in the proximal section of the instrument tube.

It will be appreciated that the outer sheath 13 in the above arrangement is of varying thickness in order to provide a uniform overall thickness of the body of the instrument tube. The outer sheath 13 has a smaller thickness at the distal end of the instrument tube and a larger thickness at the proximal end of the instrument tube.

By adopting the design, the material of the supporting layer 12 and the inner sheath layer 11 can be reduced, the cost is saved, and meanwhile, the distal end of the instrument tube has enough bending strength and cannot collapse when being bent.

In one embodiment of the present invention, as shown in fig. 3 to 5, the instrument tube further comprises a second tube section 2, the second tube section 2 is a single-layer tube, and the second tube section 2 is integrally connected to the proximal end of the first tube section 1.

In the above-described embodiment, the material of the second pipe section 2 may be the same as the material of the outer sheath 13 of the first pipe section 1. The second tube section 2 is integrally connected to the proximal end of the first tube section 1 to form a complete instrument tube. By adopting the design, the material of the supporting layer 12 and the inner sheath layer 11 can be reduced, the cost is saved, and meanwhile, the distal end of the instrument tube has enough bending strength and cannot collapse when being bent.

Further, as shown in fig. 3, the proximal end of the inner sheath 11 is provided with a connecting section 111, and the second pipe body section 2 is integrally connected to the connecting section 111.

In the above solution, in order to integrally connect the second pipe body segment 2 and the proximal end of the first pipe body segment 1, a segment of the inner sheath 11, i.e. the connecting segment 111, is reserved at the proximal end of the first pipe body segment 1, and the second pipe body segment 2 and the connecting segment 111 are integrally connected.

For example, the outer sheath 13 of the first tube segment 1 is a heat shrink tube or PEBAX, the inner sheath 11 is PTFE (teflon tube), the second tube segment 2 is made of a heat shrink tube, a section of teflon tube is reserved at the proximal end of the first tube segment 1, and the heat shrink tube of the second tube segment 2 and the reserved teflon tube are connected in a hot-melt manner.

In another embodiment of the present invention, there is provided an endoscope comprising a handle portion and an insertion portion having the aforementioned instrument tube disposed therein.

In the instrument tube in the endoscope in the above scheme, due to the supporting effect of the supporting layer 12 on the tube body of the instrument, when the section of the instrument tube covered with the supporting layer 12 is bent, the bent part of the instrument tube can be smoothly transited, so that the bent part of the instrument tube cannot collapse, the instrument can smoothly pass through the instrument channel tube, and biopsy sampling and the like are performed through a medical instrument.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An instrument tube, comprising a first tube section (1), the first tube section (1) comprising an inner sheath (11), a supporting layer (12) covering the inner sheath (11), an outer sheath (13) covering the supporting 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).

2. The device tube according to claim 1, characterized in that the outer sheath (13) and/or the inner sheath (11) are of plastic material.

3. The instrumentation tube of claim 2 wherein the support layer (12) is helical or mesh-like.

4. The instrument tube according to claim 3, characterized in that the support layer (12) is of metal.

5. The device tube according to claim 4, characterized in that the inner sheath (11), the supporting layer (12) and the outer sheath (13) are joined together by an integral molding process.

6. The device tube according to claim 2, characterized in that the length of the supporting layer (12) is smaller than the length of the inner sheath (11) and the length of the outer sheath (13).

7. The device tube according to claim 2, characterized in that the length of the inner sheath (11) is smaller than the length of the outer sheath (13), the inner sheath (11) and the supporting layer (12) being located at the distal section of the device tube.

8. An instrument tube according to claim 2, further comprising a second tube segment (2), the second tube segment (2) being a single-layer tube, the second tube segment (2) being integrally connected to the proximal end of the first tube segment (1).

9. Device tube according to claim 8, characterized in that the proximal end of the inner sheath (11) is provided with a connecting section (111), the second tube body section (2) being integrally connected with the connecting section (111).

10. An endoscope, comprising a handle portion and an insertion portion, the insertion portion having an instrument tube according to any one of claims 1 to 9 disposed therein.