CN213047043U - Biliary tract biopsy external member - Google Patents

Abstract

The utility model provides a biliary tract biopsy external member, relate to medical instrument technical field, including the outer tube, interior sleeve pipe and seal wire, the outer tube cover is located outside the inner tube cover, outside the seal wire was located to interior sleeve pipe cover, the seal wire is used for guiding interior sleeve pipe and outer tube to extend biliary tract narrow section, interior sheathed tube one side is provided with the blade, the cutting edge of blade sets up along the length direction of blade, the blade is convoluteed in interior sheathed tube outer wall along interior sheathed tube axial, the blade can stretch out or withdraw for the outer tube, the blade includes that the holding stretches out to the outer sampling state of outer tube in the closed condition of outer tube. The biliary tract biopsy external member has the advantages of reasonable structural design, safe and convenient operation, stable biting and cutting sampling and higher accuracy.

Description

Biliary tract biopsy external member

Technical Field

The utility model relates to the technical field of medical equipment, particularly, relate to a biliary tract biopsy external member.

Background

Biliary stricture is one of the common diseases in clinic, and the judgment of benign and malignant properties of biliary stricture is very important for the selection of a treatment mode of a patient and the prognosis of the disease, but clinical differential diagnosis is very difficult, particularly malignant biliary stricture, and because early symptoms are atypical, the patient has middle and late stages when the patient has obvious clinical expression, the radical surgical resection rate and survival rate are low, and the prognosis is very poor.

Currently, the histopathological examination method related to the biliary tract mainly includes Percutaneous Transhepatic Cholestenosing Drainage (PTCD), which is a series of techniques that a bile duct is punctured percutaneously through the liver and placed in a drainage tube under the guidance of an imaging device (usually X-ray fluoroscopy or B-ultrasound under digital subtraction technique) to make the bile flow to the outside of the body or the duodenum. However, the positive rate is low, the accuracy is poor, and the clinical application is limited.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a biliary tract biopsy external member has that structural design is reasonable, the operation is safe convenient, sting and cut the advantage that the appearance is stable, the accuracy is higher.

The embodiment of the utility model is realized like this:

the embodiment of the utility model provides a biliary tract biopsy external member, including outer tube, interior sleeve pipe and seal wire, the outer tube sleeve is located outside the inner tube sleeve, the inner tube sleeve is located outside the seal wire, the seal wire is used for the guide interior sleeve pipe with the outer tube extends biliary tract narrow section, interior sheathed tube one side is provided with the blade, the cutting edge of blade is followed the length direction of blade sets up, the blade is followed interior sheathed tube axial is convoluteed in interior sheathed tube outer wall, the blade can for the outer tube stretches out or withdraws, the blade include the holding in closed state and part in the outer tube stretch out to the sampling state outside the outer tube. The biliary tract biopsy external member has the advantages of reasonable structural design, safe and convenient operation, stable biting and cutting sampling and higher accuracy.

Optionally, in a preferred embodiment of the present invention, a guiding head communicated with the inner sleeve is disposed at a distal end of the inner sleeve, the guiding head is sleeved outside the guide wire and exposed outside the outer sleeve, the guiding head is of a conical structure, and an outer diameter of the conical structure is gradually reduced from one end close to the blade to one end far away from the blade.

Optionally, in a preferred embodiment of the present invention, one end of the outer sleeve close to the guide head is provided with a first metal coil, and one end of the guide head close to the blade is provided with a second metal coil.

Optionally, in a preferred embodiment of the present invention, the proximal end of the inner sleeve is provided with a knob communicated with the inner sleeve, the knob is used for driving the inner sleeve to move relative to the outer sleeve.

Optionally, in a preferred embodiment of the present invention, the knob includes a knob body and a connecting portion, the outer diameter of the knob body is greater than the outer diameter of the connecting portion, and the knob body is connected to the outer sleeve by a thread through the connecting portion.

Optionally, in a preferred embodiment of the present invention, a side of the outer sleeve away from the blade is provided with a contrast port, and the contrast port is located at the top of the outer sleeve.

Optionally, in a preferred embodiment of the present invention, an angle between the axis of the contrast opening and the outer sleeve ranges from 30 ° to 60 °.

Optionally, in a preferred embodiment of the present invention, the outer sleeve has a diameter ranging from 7.5mm to 8.5 mm.

Optionally, in a preferred embodiment of the present invention, the outer sleeve has a diameter of 8 mm.

Optionally, in a preferred embodiment of the present invention, the blade is made of pure titanium, titanium alloy, stainless steel or carbon steel.

The utility model discloses beneficial effect includes:

this biliary tract biopsy external member includes the outer tube, interior sleeve pipe and seal wire, the outer tube cover is located outside the inner tube cover, outside the seal wire was located to interior sleeve pipe cover, the seal wire is used for guiding interior sleeve pipe and outer tube to extend biliary tract stenosis section, interior sheathed tube one side is provided with the blade, the cutting edge of blade sets up along the length direction of blade, the blade is convoluteed in interior sheathed tube outer wall along interior sheathed tube axial, the blade can stretch out or withdraw for the outer tube, the blade includes the closed state of holding in the outer tube and the sampling state that the part stretches out to the outer tube outside. When the biliary tract biopsy kit is applied to percutaneous transhepatic biliary tract drainage, firstly, under the guidance of an imaging device (usually X-ray fluoroscopy or B-ultrasound under a digital subtraction technology), percutaneously transhepatic bile duct is punctured and the bile flows into a drainage tube, then a guide wire extends into the drainage tube, continuously extends into the far end of the guide wire along the extension direction of the drainage tube to pass through a biliary tract narrow section, then an assembled outer sleeve and an assembled inner sleeve (at the moment, a blade is in a closed state) extend into the drainage tube together, continuously extend into the far end of the outer sleeve and the far end of the inner sleeve along the extension direction of the drainage tube under the guidance of the guide wire to be in the biliary tract narrow section, then the inner sleeve is screwed so that the inner sleeve continuously extends into a part of the blade along the extension direction of the drainage tube to extend out of the outer sleeve (namely, the blade is in a sampling state), and the part of the blade loses the constraint effect of the outer sleeve, the inner sleeve moves relative to the outer sleeve, so that focal tissues can be cut through the cutting edges of the partial blades extending out of the outer sleeve, then the inner sleeve moves in the reverse direction relative to the outer sleeve, so that the partial blades close to the far end of the inner sleeve are retracted into the outer sleeve, at the moment, the inner wall surface of the outer sleeve binds the blades again, the blades are located between the outer wall surface of the inner sleeve and the inner wall surface of the outer sleeve, the focal tissues are clamped between the inner wall surface of the blades and the outer wall surface of the inner sleeve, the blades are in a closed state again, and finally the outer sleeve, the inner sleeve and the guide wire are taken out of the drainage tube to detect and analyze the acquired focal tissues. Compared with related medical instruments in the prior art, the biliary tract biopsy external member has the advantages of reasonable structural design, safe and convenient operation, stable biting and cutting sampling and higher accuracy.

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 will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to these drawings without inventive efforts.

Fig. 1 is a schematic structural view of a biliary biopsy kit according to an embodiment of the present invention, in which a blade is in a closed state;

fig. 2 is a schematic structural view of a biliary biopsy kit according to an embodiment of the present invention, in which a blade is in a sampling state;

fig. 3 is a schematic structural view of an outer sleeve in a biliary tract biopsy kit according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an inner cannula in a biliary tract biopsy kit according to an embodiment of the present invention.

Icon: 100-biliary biopsy kit; 10-outer sleeve; 11-a first metal coil; 12-a contrast port; 20-inner sleeve; 21-a blade; 22-a guide head; 221-a second metal coil; 23-a knob; 231-knob body; 232-a connecting part; 30-a guide wire; 200-drainage tube.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters indicate like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Referring to fig. 1 to 4, the present embodiment provides a biliary biopsy kit 100, including an outer cannula 10, an inner cannula 20, and a guide wire 30, wherein the outer cannula 10 is sleeved outside the inner cannula 20, the inner cannula 20 is sleeved outside the guide wire 30, the guide wire 30 is used to guide the inner cannula 20 and the outer cannula 10 to a biliary stricture, one side of the inner cannula 20 is provided with a blade 21, a cutting edge of the blade 21 is disposed along a length direction of the blade 21, the blade 21 is wound on an outer wall surface of the inner cannula 20 along an axial direction of the inner cannula 20, the blade 21 is capable of extending or retracting relative to the outer cannula 10, and the blade 21 includes a closed state accommodated in the outer cannula 10 and a sampling state partially extending out of the. The biliary tract biopsy kit 100 has the advantages of reasonable structural design, safe and convenient operation, stable bite-cutting sampling and higher accuracy.

First, since the biliary biopsy kit 100 needs to extend into the biliary tract of the patient along the drainage tube 200, for the convenience of distinguishing the description, in the present application, one end of each component extending into the biliary tract of the patient or the end farther from the doctor position is referred to as a distal end, and one end of each component used for holding operation of the doctor or the end closer to the doctor position is referred to as a proximal end, for example: the distal end of the outer sleeve 10, the proximal end of the outer sleeve 10, the distal end of the inner sleeve 20, the proximal end of the inner sleeve 20, the distal end of the guide wire 30, the proximal end of the guide wire 30, the distal end of the blade 21, the proximal end of the blade 21, and the like.

Secondly, as shown in fig. 1 and 2, the outer cannula 10 is sleeved outside the inner cannula 20, the inner cannula 20 is sleeved outside the guide wire 30, and the relative position relationship among the outer cannula 10, the inner cannula 20 and the guide wire 30 in the use process of the biliary biopsy kit 100 is described, which is not used for limiting the sequence of the outer cannula 10, the inner cannula 20 and the guide wire 30 extending into the biliary tract of the patient.

Generally, the function of the guide wire 30 mainly includes the following three aspects: to reach the target vessel, to deliver surgical instruments, and to cross the lesion. Compared with the outer sleeve 10 and the inner sleeve 20, the guide wire 30 has sufficient strength to pass through the biliary stenosis of the patient, so that, in practical use, the guide wire 30 extends into the drainage tube 200 before the outer sleeve 10 and the inner sleeve 20 and continuously extends into the distal end of the guide wire 30 along the extension direction of the drainage tube 200 to pass through the biliary stenosis. The outer cannula 10 is sleeved outside the inner cannula 20, the inner cannula 20 is provided with a through hole along the axial direction, so that the outer cannula 10 and the inner cannula 20 can extend into the drainage tube 200 together, and continuously extend into the far end of the outer cannula 10 and the far end of the inner cannula 20 at the biliary tract narrow section of the patient along the extension direction of the drainage tube 200 under the guidance of the guide wire 30.

It should be noted that, regarding the type, diameter and length of the guide wire 30, those skilled in the art should be able to make reasonable selection and design according to the actual situation, as long as the guide wire 30 can pass through the biliary tract stenosis, and at the same time, the outer cannula 10 and the inner cannula 20 can be guided to extend to the biliary tract stenosis, which is not limited herein.

Thirdly, as shown in fig. 1, 2 and 4, one side of the inner sleeve 20 is provided with a blade 21, the cutting edge of the blade 21 is arranged along the length direction of the blade 21, the blade 21 is wound on the outer wall surface of the inner sleeve 20 along the axial direction of the inner sleeve 20, and when the relative position of the outer sleeve 10 and the inner sleeve 20 is changed, the blade 21 can be extended or retracted relative to the outer sleeve 10.

As shown in fig. 1, in the process that the outer cannula 10 and the inner cannula 20 extend to the narrow part of the biliary tract under the guidance of the guide wire 30, in order to avoid the blade 21 from damaging the drainage tube 200 and affecting the treatment, the relative positions of the outer cannula 10 and the inner cannula 20 should be determined such that the blade 21 can be completely accommodated in the outer cannula 10, and at this time, the blade 21 is located between the outer wall surface of the inner cannula 20 and the inner wall surface of the outer cannula 10 and is in a closed state under the constraint of the inner wall surface of the outer cannula 10.

As shown in fig. 2, when the outer cannula 10 and the inner cannula 20 have been extended to the narrow segment of the biliary tract and the patient needs to be sampled by the blades 21, the inner cannula 20 moves relative to the outer cannula 10 so that the portion of the blades 21 near the distal end of the inner cannula 20 is extended out of the outer cannula 10, the portion of the blades 21 moves toward the side away from the outer wall surface of the inner cannula 20 due to the loss of the binding effect of the outer cannula 10, and a certain gap is formed between the portion of the blades 21 and the outer wall surface of the inner cannula 20, and the inner cannula 20 continues to move relative to the outer cannula 10, so that the focal tissue can be cut off by the blade edge of the portion of the.

As shown in fig. 1, after the portion of the blade 21 extending out of the outer cannula 10 obtains the lesion tissue by the blade edge, the lesion tissue can be accommodated in the gap between the portion of the blade 21 and the outer wall surface of the inner cannula 20, and in order to take out the sampled lesion tissue from the patient body smoothly, the inner cannula 20 needs to move in the reverse direction relative to the outer cannula 10, so that the portion of the blade 21 close to the distal end of the inner cannula 20 is retracted into the outer cannula 10, at this time, the inner wall surface of the outer cannula 10 binds the blade 21 again, the blade 21 is located between the outer wall surface of the inner cannula 20 and the inner wall surface of the outer cannula 10, the lesion tissue is clamped between the inner wall surface of the blade 21 and the outer wall surface of the inner.

It should be noted that, as shown in fig. 2, since a part of the blade 21 is accommodated in the outer sleeve 10 and a part of the blade 21 extends out of the outer sleeve 10 when the blade 21 is in the sampling state, the inner wall of the outer sleeve 10 still has a binding effect on the part of the blade 21 accommodated in the outer sleeve 10, and the part of the blade 21 extending out of the outer sleeve 10 can be retracted into the outer sleeve 10 along the original winding tendency of the blade 21 just under the binding effect of the outer sleeve 10 on the part of the blade 21.

Fourthly, when the biliary biopsy kit 100 is applied to percutaneous transhepatic biliary drainage, it is required to firstly puncture a bile duct percutaneously and put into the drainage tube 200 under guidance of an imaging device (usually, X-ray fluoroscopy or B-ultrasound under digital subtraction technology), so that bile flows to the outside of the body, then extend the guide wire 30 into the drainage tube 200, and continuously extend into the distal end of the guide wire 30 along the extension direction of the drainage tube 200 to pass through the biliary tract narrow section, then extend the assembled outer cannula 10 and inner cannula 20 (at this time, the blade 21 is in a closed state) into the drainage tube 200, and continuously extend into the distal end of the outer cannula 10 and the distal end of the inner cannula 20 along the extension direction of the drainage tube 200 under guidance of the guide wire 30 to be in the biliary tract narrow section, then screw the inner cannula 20 so that the inner cannula 20 continuously extends into the outer cannula 10 along the extension direction of the drainage tube 200 until a part of the blade 21 extends out of the outer cannula 10 (i.e., the blade 21 is, the partial blades 21, which are not bound by the outer sleeve 10, move toward the side away from the outer wall surface of the inner sleeve 20, and a certain gap is formed between the inner sleeve 20 and the outer wall surface of the inner sleeve 10, the inner sleeve 20 continues to move relative to the outer sleeve 10, so that lesion tissues can be incised by the cutting edges of the partial blades 21 extended out of the outer sleeve 10, and then the inner sleeve 20 is moved in the reverse direction with respect to the outer sleeve 10, so that the portion of the blades 21 near the distal end of the inner cannula 20 are retracted into the outer cannula 10, at which point, the inner wall surface of the outer sleeve 10 binds the blade 21 again, the blade 21 is positioned between the outer wall surface of the inner sleeve 20 and the inner wall surface of the outer sleeve 10, the focal tissue is clamped between the inner wall surface of the blade 21 and the outer wall surface of the inner sleeve 20, the blade 21 is in a closed state again, and finally the outer sleeve 10, the inner sleeve 20 and the guide wire 30 are taken out from the drainage tube 200 to detect and analyze the acquired focal tissue.

As described above, the biliary biopsy kit 100 includes the outer cannula 10, the inner cannula 20 and the guide wire 30, the outer cannula 10 is sleeved outside the inner cannula 20, the inner cannula 20 is sleeved outside the guide wire 30, the guide wire 30 is used for guiding the inner cannula 20 and the outer cannula 10 to extend to the biliary stenosis section, one side of the inner cannula 20 is provided with the blade 21, a cutting edge of the blade 21 is disposed along a length direction of the blade 21, the blade 21 is wound on an outer wall surface of the inner cannula 20 along an axial direction of the inner cannula 20, the blade 21 can extend or retract relative to the outer cannula 10, and the blade 21 includes a closed state accommodated in the outer cannula 10 and a sampling state partially extending out of the outer cannula 10. When the biliary biopsy kit 100 is applied to percutaneous transhepatic biliary drainage, it is required to firstly puncture a bile duct percutaneously and put into the drainage tube 200 under guidance of an imaging device (usually, X-ray fluoroscopy or B-ultrasound under digital subtraction technology), so that bile flows to the outside of the body, then extend the guide wire 30 into the drainage tube 200, and continuously extend into the distal end of the guide wire 30 along the extending direction of the drainage tube 200 to pass through the biliary tract narrow section, then extend the assembled outer cannula 10 and inner cannula 20 (at this time, the blade 21 is in a closed state) into the drainage tube 200, and continuously extend into the distal end of the drainage tube 10 and the distal end of the inner cannula 20 along the extending direction of the drainage tube 200 under guidance of the guide wire 30 to be in the biliary tract narrow section, then screw the inner cannula 20 so that the inner cannula 20 continuously extends into the outer cannula 10 along the extending direction of the drainage tube 200 until a part of the blade 21 extends out of the outer cannula 10 (i.e., the blade 21, the partial blades 21, which are not bound by the outer sleeve 10, move toward the side away from the outer wall surface of the inner sleeve 20, and a certain gap is formed between the inner sleeve 20 and the outer wall surface of the inner sleeve 10, the inner sleeve 20 continues to move relative to the outer sleeve 10, so that lesion tissues can be incised by the cutting edges of the partial blades 21 extended out of the outer sleeve 10, and then the inner sleeve 20 is moved in the reverse direction with respect to the outer sleeve 10, so that the portion of the blades 21 near the distal end of the inner cannula 20 are retracted into the outer cannula 10, at which point, the inner wall surface of the outer sleeve 10 binds the blade 21 again, the blade 21 is positioned between the outer wall surface of the inner sleeve 20 and the inner wall surface of the outer sleeve 10, the focal tissue is clamped between the inner wall surface of the blade 21 and the outer wall surface of the inner sleeve 20, the blade 21 is in a closed state again, and finally the outer sleeve 10, the inner sleeve 20 and the guide wire 30 are taken out from the drainage tube 200 to detect and analyze the acquired focal tissue. Compared with the related medical apparatus in the prior art, the biliary tract biopsy kit 100 has the advantages of reasonable structural design, safe and convenient operation, stable bite-cut sampling and higher accuracy.

As shown in fig. 1, 2 and 4, in order to make it easier for the inner cannula 20 to extend into the narrow segment of the biliary tract, in the present embodiment, the distal end of the inner cannula 20 is provided with a guiding head 22 communicated with the inner cannula 20, the guiding head 22 is sleeved outside the guide wire 30 and exposed outside the outer cannula 10, the guiding head 22 is in a conical structure, and the outer diameter of the conical structure is gradually reduced from one end close to the blade 21 to one end far away from the blade 21.

As shown in fig. 1 to 4, in the present embodiment, one end of the outer tube 10 close to the guide head 22 is provided with a first metal coil 11, and one end of the guide head 22 close to the blade 21 is provided with a second metal coil 221. Since the first metal coil 11 and the second metal coil 221 are only recognized as black lines in the imaging device, the first metal coil 11 is disposed at the distal end of the outer cannula 10 and the second metal coil 221 is disposed at the proximal end of the guide head 22, so that the doctor can visually judge the positions of the outer cannula 10 and the inner cannula 20 in the biliary tract of the patient by observing the black lines displayed by the first metal coil 11 and the black lines displayed by the second metal coil 221 in the imaging device, so as to accurately extend the distal end of the outer cannula 10 and the distal end of the inner cannula 20 to the narrow segment of the biliary tract, and also visually judge the movement distance of the inner cannula 20 relative to the outer cannula 10, i.e. the length of the portion of the blade 21 extending out of the outer cannula 10, so as to avoid that the blade 21 extends too much and the portion of the blade 21 accommodated in the outer cannula 10 is too little, resulting in difficulty in withdrawing the portion of the blade 21 that extends outside the outer sleeve 10.

As shown in fig. 1, 2 and 4, in order to facilitate the physician to hold and operate the proximal end of the inner cannula 20 to move the inner cannula 20 relative to the outer cannula 10, in the present embodiment, the proximal end of the inner cannula 20 is provided with a knob 23 communicating with the inner cannula 20, and the knob 23 is used for driving the inner cannula 20 to move relative to the outer cannula 10. Preferably, the knob 23 may also be provided with anti-slip lines to avoid the inconvenience and easy slipping of the doctor wearing the glove.

Further, as shown in fig. 1 and 2, in the present embodiment, the knob 23 includes a fixedly connected knob body 231 and a connecting portion 232, an outer diameter of the knob body 231 is larger than an outer diameter of the connecting portion 232, and the knob body 231 is screwed with the outer sleeve 10 through the connecting portion 232, so that a distance by which the inner sleeve 20 protrudes with respect to the outer sleeve 10 is limited by a step surface (also an end surface of the knob body 231) formed between the knob body 231 and the connecting portion 232. When the inner sleeve 20 moves relative to the outer sleeve 10 until the proximal end of the outer sleeve 10 abuts against the step surface, the blade 21 cannot extend outward any further, i.e. the length of the connecting portion 232 is equal to the length of the blade 21 partially extending out of the outer sleeve 10. Therefore, the length of the connecting portion 232 can be preset in advance so that the length of the blade 21 partially protruding out of the outer sleeve 10 can be easily controlled.

Preferably, as shown in fig. 1 to 3, a side of the outer cannula 10 away from the blade 21 is provided with a contrast port 12, and the contrast port 12 is located at the top of the outer cannula 10, so as to more intuitively and accurately identify the position of the distal end of the outer cannula 10 by injecting contrast medium into the outer cannula 10.

Optionally, the angle between the axis of the contrast port 12 and the outer sleeve 10 ranges from 30 ° to 60 °. Illustratively, the angle between the axis of the contrast port 12 and the outer cannula 10 is 30 °, 45 °, 60 °, etc., to facilitate injection of contrast agent into the outer cannula 10 through the contrast port 12.

In order to enable the distal end of the outer cannula 10 and the distal end of the inner cannula 20 to smoothly extend to the biliary tract stenosis, the diameter of the outer cannula 10 may optionally range from 7.5mm to 8.5mm in consideration of the width range of the biliary tract stenosis of a general patient. In this embodiment, the outer sleeve 10 has a diameter of 8 mm.

Regarding the choice of the material of the blade 21, on one hand, it is necessary to ensure a certain strength of the blade 21 for facilitating the cutting and sampling, and on the other hand, it is necessary to ensure a certain elasticity of the blade 21, which can be extended or retracted by the outer sleeve 10. Optionally, the material of the blade 21 is pure titanium, titanium alloy, stainless steel or carbon steel.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The biliary biopsy kit is characterized by comprising an outer sleeve, an inner sleeve and a guide wire, wherein the outer sleeve is sleeved outside the inner sleeve, the inner sleeve is sleeved outside the guide wire, the guide wire is used for guiding the inner sleeve and the outer sleeve to extend to a biliary stenosis section, a blade is arranged on one side of the inner sleeve, a cutting edge of the blade is arranged along the length direction of the blade, the blade is wound on the outer wall surface of the inner sleeve along the axial direction of the inner sleeve, the blade can extend out of or retract from the outer sleeve, and the blade comprises a closed state accommodated in the outer sleeve and a sampling state partially extending out of the outer sleeve.

2. The biliary biopsy kit according to claim 1, wherein a guide head is disposed at a distal end of the inner cannula and is in communication with the inner cannula, the guide head is sleeved outside the guide wire and exposed outside the outer cannula, the guide head has a conical structure, and an outer diameter of the conical structure gradually decreases from an end close to the blade to an end away from the blade.

3. The biliary biopsy kit of claim 2, wherein an end of the outer cannula proximate the guide head is provided with a first metal coil, and an end of the guide head proximate the blade is provided with a second metal coil.

4. The biliary biopsy kit of claim 3, wherein the proximal end of the inner cannula is provided with a knob in communication with the inner cannula, the knob configured to move the inner cannula relative to the outer cannula.

5. The biliary biopsy kit of claim 4, wherein the knob comprises a knob body and a connecting portion, the knob body having an outer diameter larger than an outer diameter of the connecting portion, the knob body being threadably connected to the outer cannula via the connecting portion.

6. The biliary biopsy kit of claim 1, wherein a side of the outer cannula distal to the blade is provided with a visualization port, the visualization port being located at a top of the outer cannula.

7. The biliary biopsy kit of claim 6, wherein an angle between the axis of the contrast port and the outer cannula is in a range of 30 ° to 60 °.

8. The biliary biopsy kit of any one of claims 1-7, wherein the outer cannula has a diameter in a range from 7.5mm to 8.5 mm.

9. The biliary biopsy kit of claim 8, wherein the outer cannula has a diameter of 8 mm.

10. The biliary biopsy kit of claim 1, wherein the blade is made of pure titanium, titanium alloy, stainless steel, or carbon steel.

Images