Auxiliary catheter for biliopancreatic duct biopsy

Abstract

The utility model relates to an auxiliary catheter for biliopancreatic duct biopsy, which belongs to the technical field of medical instruments and solves the problems of difficulty in insertion, few biopsy tissues, low positive rate and the like when biliopancreatic ducts are subjected to biopsy sampling. The auxiliary catheter for biliopancreatic duct biopsy comprises a conical head tube, a metal indicating piece, an elastic deformation assembly, a catheter main body and a traction wire, the metal indicating piece is arranged on the outer surface of the conical head pipe; the elastic deformation assembly is connected between the conical head pipe and the catheter main body; two guide wire holes are formed in the catheter main body, and the upper end of the traction wire is fixedly connected with the conical head tube; bending deformation of the elastic deformation assembly can be realized by pulling the traction wire; the elastic deformation assembly comprises an elastic deformation framework and an elastic deformation hoop; and a plurality of groups of elastic deformation hoops are distributed in the axial direction of the elastic deformation framework in an array manner. According to the auxiliary catheter, biopsy forceps can be rapidly and safely inserted, multi-position and multi-angle targeted biopsy can be achieved, and biopsy safety and sampling accuracy are improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an auxiliary catheter for bile and pancreatic duct biopsy. Background Technology

[0002] Benign and malignant lesions of the biliary tract can easily lead to biliary stricture. Clarifying the nature of the stricture is crucial for the diagnosis and treatment strategy of patients.

[0003] Currently, histopathological examination of biliary strictures generally involves using biopsy forceps to sample the bile and pancreatic ducts for pathological examination. However, on the one hand, inserting biopsy forceps into the bile and pancreatic ducts is relatively difficult, requiring a high level of skill and experience from the operator, and carries risks such as bleeding and perforation; on the other hand, once the biopsy forceps are inserted into the bile and pancreatic ducts, their direction and angle are difficult to adjust, requiring "blind sampling" under X-ray guidance based on the estimated location, resulting in small sample sizes and low biopsy accuracy.

[0004] Therefore, for patients with unexplained biliary and pancreatic duct stenosis, the conventional biopsy forceps sampling method has the aforementioned limitations. There is an urgent need to provide a biopsy auxiliary device to assist in the biopsy forceps sampling process, thereby achieving "safe and simple operation, multi-site and multi-angle targeted biopsy", and thus improving the safety and accuracy of biopsy. Utility Model Content

[0005] Based on the above analysis, the present invention aims to provide an auxiliary catheter for bile and pancreatic duct biopsy to solve the problems of difficult insertion and low sample accuracy of existing biopsy forceps.

[0006] The objective of this utility model is mainly achieved through the following technical solutions:

[0007] A catheter for assisting in bile and pancreatic duct biopsy includes: a conical tube, a metal indicator, an elastic deformation component, a catheter body, and a traction wire;

[0008] The metal indicator is disposed on the outer surface of the cone tube and is used to display the position of the cone tube under X-ray fluoroscopy.

[0009] The elastic deformation component is connected between the conical tube and the catheter body; the conical tube, the elastic deformation component and the catheter body are all cylindrical structures, and the internal channel of the biliary and pancreatic duct biopsy auxiliary catheter can insert a guide wire or biopsy forceps, and the guide wire guidance facilitates rapid catheter insertion.

[0010] The catheter body has a guide wire hole inside, and the upper end of the traction wire passes through the guide wire hole and is fixedly connected to the conical tube; pulling the traction wire can realize the bending deformation of the elastic deformation component;

[0011] The elastic deformation component includes: an elastic deformation skeleton and an elastic deformation hoop.

[0012] Furthermore, the elastic deformation skeleton includes: an annular upper support, a longitudinal stiffening beam, and an annular lower support; the annular upper support is fixedly connected to the lower end face of the conical tube; the annular lower support is fixedly connected to the upper end face of the conduit body; and the longitudinal stiffening beam is connected between the annular upper support and the annular lower support.

[0013] Furthermore, two longitudinal stiffening beams are provided, and the two longitudinal stiffening beams are spaced 180° apart along the circumferential direction of the annular upper support.

[0014] Furthermore, the elastically deformable hoop is a semi-circular hoop.

[0015] Furthermore, two sets of the elastic deformation hoop are symmetrically arranged on both sides of the longitudinal reinforcing beam; the two ends of the elastic deformation hoop are respectively fixedly connected to the sides of the two longitudinal reinforcing beams.

[0016] Furthermore, the traction wire is positioned between the two longitudinal reinforcing beams and is located outside the elastic deformation hoop.

[0017] Furthermore, the two traction wires are arranged at 180° intervals along the circumference of the catheter body.

[0018] Furthermore, the distance between two adjacent elastic deformation rings is less than 1 mm.

[0019] Furthermore, multiple sets of the elastic deformation hoop rings are arrayed along the axial direction of the elastic deformation skeleton.

[0020] Furthermore, a traction ring is provided at the end of the traction wire.

[0021] The technical solution of this utility model can achieve at least one of the following effects:

[0022] 1. The auxiliary catheter for bile and pancreatic duct biopsy of this utility model can be used as a guide tube for biopsy forceps. In use, under the guidance of a guidewire, the auxiliary catheter can be quickly inserted into the interior of the bile and pancreatic duct through the forceps channel of a duodenoscope; further, the biopsy forceps are inserted from the end of the main body of the auxiliary catheter and exited from the front end of the conical tube; by pulling the traction wire, the elastic deformation component of the auxiliary catheter is bent to the side (left or right). The auxiliary catheter of this utility model can guide the biopsy forceps inside, so that the end of the conical tube is aligned with the side wall tissue surface of the bile and pancreatic duct, thereby enabling sampling of the superficial tissue of the bile and pancreatic duct through the biopsy forceps.

[0023] 2. The bile duct and pancreatic duct biopsy auxiliary catheter of this invention has a metal indicator on the outer surface of the conical tube. This metal indicator is not transparent to X-rays. Therefore, it can assist in the accurate positioning of the catheter inside the bile duct and pancreatic duct, accurately indicating the location of the catheter tip and the stenotic lesion.

[0024] 3. The bile and pancreatic duct biopsy auxiliary catheter of this utility model, by setting an elastic deformable skeleton and two rows of elastic deformable collars on both sides of the elastic deformable skeleton, forms an elastic deformable component similar to a "fishbone". When the traction wire on one side is pulled, it can promote the reduction of the spacing of multiple elastic deformable collars on one side (one row) and the increase of the spacing of multiple elastic deformable collars on the other side (another row). At the same time, the longitudinal ribs of the elastic deformable skeleton bend laterally, realizing the bending deformation of the elastic deformable component, thereby realizing the bending of the auxiliary catheter head, realizing the flexible adjustment of the sampling direction of the internal biopsy forceps, so that the port of the conical tube tilts to the side, and the biopsy forceps can be aligned with the side wall of the bile and pancreatic duct for sampling, realizing multi-angle and multi-site biopsy, and improving the sample volume and accuracy.

[0025] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the description and accompanying drawings, which are particularly pointed out. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0027] Figure 1 This is a schematic diagram of the structure of the auxiliary catheter for bile and pancreatic duct biopsy of this utility model;

[0028] Figure 2 This is a cross-sectional view of the auxiliary catheter for bile and pancreatic duct biopsy of this utility model.

[0029] Figure 3 This is a partially enlarged view of the upper end of the auxiliary catheter for bile and pancreatic duct biopsy of this utility model;

[0030] Figure 4 This is a cross-sectional view of the upper end of the auxiliary catheter for bile and pancreatic duct biopsy of this utility model.

[0031] Figure 5 This is a schematic diagram of the elastic deformation component of the bile and pancreatic duct biopsy auxiliary catheter of this utility model.

[0032] Figure 6This is a schematic diagram showing the usage status of the bile and pancreatic duct biopsy auxiliary catheter of this utility model.

[0033] Figure label:

[0034] 1-Conical tube; 2-Metal indicator; 3-Elastic deformable skeleton; 4-Elastic deformable hoop; 5-Conduit body; 6-Traction wire; 7-Traction ring;

[0035] 301 - Circular upper support; 302 - Longitudinal stiffening beam; 303 - Circular lower support. Detailed Implementation

[0036] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0037] Example 1

[0038] A specific embodiment of this utility model discloses an auxiliary catheter for bile and pancreatic duct biopsy, such as... Figure 1 , Figure 2 As shown, the device includes: a conical tube 1, a metal indicator 2, an elastic deformation assembly, a catheter body 5, and a traction wire 6; the metal indicator 2 is disposed on the outer surface of the conical tube 1; the elastic deformation assembly is connected between the conical tube 1 and the catheter body 5; the conical tube 1, the elastic deformation assembly, and the catheter body 5 are all cylindrical structures, wherein the conical tube 1 facilitates easy access to the bile and pancreatic ducts under endoscopy, and the internal channel of the bile and pancreatic duct biopsy auxiliary catheter can accommodate guide wires or biopsy forceps; the catheter body 5 has two guide wire holes inside, and the traction wire 6 has two wires; the upper end of the traction wire 6 passes through the guide wire holes and is fixedly connected to the conical tube 1; pulling the traction wire 6 can achieve bending deformation of the elastic deformation assembly.

[0039] Specifically, such as Figure 2 As shown, two guide wire holes are symmetrically arranged inside the catheter body 5 and extend along the axial direction of the catheter body 5; this allows the traction wire 6 to pass through from the lower end of the catheter body 5 and out from the upper end of the catheter body 5, thereby connecting the upper end of the traction wire 6 to the conical tube 1, which can cause the conical tube 1 to deflect at an angle relative to the catheter body 5.

[0040] In this embodiment, considering that the forceps channel diameter of the duodenoscope is 4.2 mm; preferably, the outer diameter of the auxiliary catheter of this invention is set to 4 mm, so that it can pass through the internal forceps channel of the duodenoscope; the inner diameter of the auxiliary catheter of this invention can allow guide wires or biopsy forceps to pass through.

[0041] In this embodiment, the traction wire 6 can also be led out from the internal channel of the catheter body 5; this belongs to the same technical concept and falls within the protection scope of this utility model.

[0042] In this embodiment, as Figure 3 , Figure 4 As shown, the conical tube 1 includes a circular annular section and a conical annular section; the outer side of the circular annular section is provided with a metal indicator 2.

[0043] Preferably, the metal indicator 2 is a metal ring that is pasted or nested on the outer surface of the conical tube 1, such as... Figure 1 As shown.

[0044] Alternatively, the metal indicator 2 may be one or more metal pieces adhered to or nested on the outer surface of the annular segment of the conical tube 1. Preferably, when multiple metal pieces are provided, they are evenly distributed along the circumference of the conical tube 1.

[0045] During implementation, the biopsy forceps sampling process is carried out under the monitoring of X-ray contrast equipment. In this embodiment, the design of the conical tube 1 and the catheter channel through which the guide wire can be inserted facilitates the rapid and easy insertion of the auxiliary catheter into the pancreatic and biliary ducts. By setting a metal indicator 2 on the outer surface of the conical tube 1 of the auxiliary catheter, which appears as an opaque shadow under X-rays, it can be used to locate the insertion position of the conical tube 1 of the auxiliary catheter inside the pancreatic and biliary ducts and the stenotic lesion, thereby determining whether the biopsy forceps have accurately reached the location of the stenotic lesion.

[0046] In this embodiment, as Figure 3 , Figure 4 , Figure 5 As shown, the elastic deformation component includes: an elastic deformation skeleton 3 and elastic deformation hoop rings 4; multiple sets of elastic deformation hoop rings 4 are arrayed along the axial direction of the elastic deformation skeleton 3. That is, two sets of elastic deformation hoop rings 4 are symmetrically arranged on the elastic deformation skeleton 3, with multiple rings arranged in each set, such as... Figure 3 , Figure 4 , Figure 5 As shown.

[0047] Specifically, such as Figure 5 As shown, the elastic deformation skeleton 3 includes: an annular upper support 301, a longitudinal stiffening beam 302, and an annular lower support 303; the annular upper support 301 is fixedly connected to the lower end face of the conical tube 1; the annular lower support 303 is fixedly connected to the upper end face of the conduit body 5; the longitudinal stiffening beam 302 is connected between the annular upper support 301 and the annular lower support 303.

[0048] Specifically, two longitudinal stiffening beams 302 are provided, and the two longitudinal stiffening beams 302 are spaced 180° apart along the circumferential direction of the annular upper support 301.

[0049] Specifically, the elastic deformation hoop 4 is a semi-circular hoop.

[0050] Preferably, such as Figure 3 , Figure 4 As shown, the longitudinal section of the elastic deformation hoop 4 is circular, elliptical, or crescent-shaped.

[0051] Specifically, two sets of the elastic deformation hoop 4 are symmetrically arranged on both sides of the longitudinal stiffening beam 302; the two ends of the elastic deformation hoop 4 are respectively fixedly connected to the sides of the two longitudinal stiffening beams 302.

[0052] Specifically, the traction wire 6 is positioned between the two longitudinal reinforcing beams 302 and is located outside the elastic deformation hoop 4. For example... Figure 1 , Figure 3 , Figure 4 As shown, the traction wire 6 and the longitudinal stiffener 302 are arranged in a cross shape, or in other words, the traction wire 6 and the longitudinal stiffener 302 are arranged at 90° intervals along the circumference of the conduit body 5.

[0053] Specifically, two traction wires 6 are arranged at 180° intervals along the circumference of the catheter body 5. For example... Figure 1 , Figure 2 , Figure 4 As shown, two traction wires 6 are fixedly connected to the lower surface of the conical tube 1 respectively; by pulling the two traction wires 6, the elastic deformation skeleton 3 is bent and deformed, thereby enabling the conical tube 1 to bend to the left or right relative to the main body of the conduit 5.

[0054] Preferably, in this embodiment, the traction wire 6 is made of fine metal wire, or a thin thread that is not easily broken.

[0055] Specifically, the distance between two adjacent elastic deformation hoop rings 4 is less than 1 mm.

[0056] Specifically, the elastic deformation hoop 4 is made of metal.

[0057] Specifically, a traction ring 7 is provided at the end of the traction wire 6. In this embodiment, the traction ring 7 stretches the traction wire 6, thereby shortening the length of the traction wire 6 between the conical tube 1 and the catheter body 5. This allows multiple elastic deformation rings 4 on one side to come closer together and compress, causing the elastic deformation assembly to bend and deform towards that side as a whole. Ultimately, this changes the orientation of the port of the conical tube 1, such as... Figure 6 As shown.

[0058] It is worth noting that the bile and pancreatic duct biopsy auxiliary catheters provided in the accompanying drawings of this utility model are only used to illustrate the structural composition of the bile and pancreatic duct biopsy auxiliary catheters and do not represent their actual size / proportional relationship. Designs with the same structural composition as the bile and pancreatic duct biopsy auxiliary catheters of this utility model fall within the protection scope of this utility model.

[0059] During the procedure, firstly, the bile and pancreatic duct biopsy auxiliary catheter is inserted into the forceps channel of the duodenoscope. Guided by the guidewire of the duodenoscope (an endoscope with guiding and observation functions of the internal environment), the auxiliary catheter is inserted into the bile and pancreatic duct (which communicates with the duodenum). Then, a biopsy forceps is inserted into the auxiliary catheter, with the forceps head positioned at the port of the conical tube 1 at the front end of the auxiliary catheter, placing the forceps in a sample-ready state. Further, the unilateral traction wire 6 is pulled, causing the elastic deformation component to bend. Figure 6 As shown, the elastic deformable skeleton 3 and the elastic deformable hoop 4 deform, with multiple elastic deformable hoop 4 on one side pressing against each other and increasing the distance between them on the other side. This causes the cone-shaped tube 1 of the auxiliary catheter to form a certain angle with the catheter body 5, so that the end of the cone-shaped tube 1 faces the inner wall of the bile duct and pancreatic duct. Finally, the biopsy forceps are extended from the opening of the cone-shaped tube 1, and the inner wall tissue of the bile duct and pancreatic duct is sampled through the biopsy forceps. Using the bile duct and pancreatic duct biopsy auxiliary catheter of this invention to guide the sampling operation of the biopsy forceps ensures rapid and safe insertion of the biopsy forceps, allows the forceps head to be adjusted in direction and aligned with the inner wall of the bile duct and pancreatic duct, thereby ensuring the accuracy of sampling and the sufficiency of the sample volume. This achieves the beneficial effects of "precise operation, large biopsy tissue volume, and convenient and safe operation".

[0060] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A catheter for assisting in bile and pancreatic duct biopsy, characterized in that, include: Conical tube (1), metal indicator (2), elastic deformation assembly, conduit body (5), and traction wire (6); The metal indicator (2) is disposed on the outer surface of the cone tube (1) and is used to display the position of the cone tube (1) during X-ray imaging; The elastic deformation component is connected between the conical tube (1) and the catheter body (5); the conical tube (1), the elastic deformation component and the catheter body (5) are all cylindrical structures, and the internal channel of the biliary and pancreatic duct biopsy auxiliary catheter can insert a guide wire or biopsy forceps; The catheter body (5) is provided with a guide wire hole inside, and the upper end of the traction wire (6) passes through the guide wire hole and is fixedly connected to the cone tube (1); pulling the traction wire (6) can realize the bending deformation of the elastic deformation component; The elastic deformation component includes: an elastic deformation skeleton (3) and an elastic deformation hoop (4).

2. The auxiliary catheter for bile and pancreatic duct biopsy according to claim 1, characterized in that, The elastic deformable skeleton (3) includes: an annular upper support (301), a longitudinal stiffener (302), and an annular lower support (303); the annular upper support (301) is fixedly connected to the lower end face of the conical tube (1); the annular lower support (303) is fixedly connected to the upper end face of the conduit body (5); the longitudinal stiffener (302) is connected between the annular upper support (301) and the annular lower support (303).

3. The auxiliary catheter for bile and pancreatic duct biopsy according to claim 2, characterized in that, Two longitudinal stiffening beams (302) are provided, and the two longitudinal stiffening beams (302) are spaced 180° apart along the circumferential direction of the annular upper support (301).

4. The auxiliary catheter for bile and pancreatic duct biopsy according to claim 3, characterized in that, The elastic deformation hoop (4) is a semi-circular hoop.

5. The auxiliary catheter for bile and pancreatic duct biopsy according to claim 4, characterized in that, Two sets of the elastic deformation hoop (4) are symmetrically arranged on both sides of the longitudinal stiffening beam (302); the two ends of the elastic deformation hoop (4) are fixedly connected to the sides of the two longitudinal stiffening beams (302) respectively.

6. The auxiliary catheter for bile and pancreatic duct biopsy according to claim 5, characterized in that, The traction wire (6) is positioned between the two longitudinal reinforcing beams (302) and is located outside the elastic deformation hoop (4).

7. The auxiliary catheter for bile and pancreatic duct biopsy according to any one of claims 1-6, characterized in that, Two traction wires (6) are arranged at 180° intervals along the circumferential direction of the catheter body (5).

8. The auxiliary catheter for bile and pancreatic duct biopsy according to any one of claims 1-6, characterized in that, The distance between two adjacent elastic deformation hoop rings (4) is less than 1 mm.

9. The auxiliary catheter for bile and pancreatic duct biopsy according to any one of claims 1-6, characterized in that, Multiple sets of the elastic deformation hoop (4) are arranged in an array along the axial direction of the elastic deformation skeleton (3).

10. The auxiliary catheter for bile and pancreatic duct biopsy according to claim 1, characterized in that, The end of the traction wire (6) is provided with a traction ring (7).

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