CN220125321U

CN220125321U - Guiding tube for injecting contrast medium into skin fistula

Info

Publication number: CN220125321U
Application number: CN202320799169.2U
Authority: CN
Inventors: 李晓丹; 李艳珍; 倪鑫; 王生才; 张�杰; 张雪溪; 刘悄吟; 孙念; 刘志勇; 刘雨薇
Original assignee: Beijing Childrens Hospital
Current assignee: Beijing Childrens Hospital
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2023-12-05
Anticipated expiration: 2033-04-12

Abstract

The utility model belongs to the technical field of medical equipment, and relates to a guide tube for injecting contrast medium into a skin fistula, which comprises a soft catheter and a guide wire inserted into the catheter, wherein one end of the catheter is provided with a connecting part, a connecting cavity communicated with the catheter is arranged in the connecting part, the end part of the guide wire is provided with a holding part, an inserting convex block is integrally formed on the holding part, and the inserting convex block is in inserting fit with the connecting cavity. According to the utility model, through the cooperation of the catheter and the guide wire, the fistula can be deeply tracked, and the contrast agent is injected through the lumen, so that the injection of the contrast agent is simpler, more convenient and more accurate, the injection amount of the contrast agent is convenient to control, and after stopping, the contrast agent cannot be continuously injected, thereby avoiding the situation that the contrast agent is diffused in the fistula inner opening.

Description

Guiding tube for injecting contrast medium into skin fistula

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a guide tube for injecting contrast medium into a skin fistula.

Background

Skin fistula refers to a pathological canal connecting a body surface with hollow viscera or subcutaneous soft tissues, and generally comprises an inner opening and an outer opening, wherein the outer opening is a skin fistula, the inner opening is an opening for connecting the canal with deep tissues, and the inner opening of some diseases clinically is sealed into a blind end, such as ear fistula, gill split fistula and the like. The common treatment for the above-mentioned diseases is surgical treatment. However, prior to surgical treatment, it is necessary to place a guide tube through the skin stoma to probe the length of the canal and accurately locate the site of the stoma, while precisely tracking the fistula running intraoperatively in a contrast manner, and therefore, it is necessary to place the guide tube through the skin stoma and to withdraw the guide tube while injecting a contrast medium into the fistula. However, the existing method is to perform fistula exploration and contrast agent injection by using a clinical vascular indwelling needle catheter or a puncture catheter, which has the following defects that 1, for a tortuous or narrow fistula, the currently used vascular indwelling needle guiding tube has unsuitable hardness and length or does not contain a guiding wire, and the fistula cannot be completely placed into the catheter for guiding. 2. For fistulae with too small diameters, when the guide tube cannot be fully placed, the whole fistula contrast agent cannot be injected, so that the tracking in the operation is affected. 3. For fistula with an inner port, contrast agent is injected from one end, the contrast agent can flow out from the other end, so that the contrast agent at the inner port is blurred, the position of the inner port at the inner port cannot be accurately positioned, and the purpose of complete excision of an operation cannot be achieved.

Disclosure of Invention

The utility model aims to solve the technical problems that: how to more conveniently and quickly put the percutaneous fistula into the fistula guiding tube in the whole course, and more stably and efficiently inject contrast medium into the skin fistula, and the condition that the fistula internal orifice cannot be determined is avoided.

The utility model provides a guiding tube for injecting contrast medium into a skin fistula, which comprises a soft catheter and a guide wire inserted into the catheter, wherein one end of the catheter is provided with a connecting part, a connecting cavity communicated with the catheter is arranged in the connecting part, the end part of the guide wire is provided with a holding part, an inserting convex block is integrally formed on the holding part, and the inserting convex block is in inserting fit with the connecting cavity.

Further, the side wall of the connecting part is provided with a hollow connector communicated with the connecting cavity.

Further, the side of connecting portion is equipped with the elastic bag that is used for holding contrast medium, the exit of elastic bag is equipped with the control valve, the play liquid end of control valve is equipped with the installation head, pass through threaded connection between installation head and the connector.

Further, be equipped with the division board in the connection chamber, the division board separates into intercommunication chamber and sealed chamber with the connection chamber, sealed chamber and grafting lug grafting cooperation, intercommunication chamber and connector intercommunication, be equipped with the through-hole that is used for intercommunication sealed chamber and intercommunication chamber on the division board, and the aperture of through-hole equals the diameter of seal wire.

Further, a plurality of sealing valves are arranged inside one end of the conduit away from the connecting part.

Further, the sealing valve is spaced more than 3 millimeters from the free end of the catheter.

Further, an end of the guide wire remote from the grip portion is received within the interior of the catheter.

Further, the guide tube is provided with scale values which gradually increase from the free end of the guide tube to the connecting part.

The utility model has the beneficial effects that:

1. according to the utility model, through the cooperation of the catheter and the guide wire, the fistula catheter can be penetrated into the fistula, the fistula part attached to the inner wall is propped up, and the fistula catheter is placed through the percutaneous fistula in the whole course, so that the length of a pipeline is probed and the position of the inner opening is accurately positioned.

2. The contrast agent is injected into the fistula in the whole process more stably and smoothly, which is helpful for tracking the fistula in the operation.

3. When the utility model is used for injecting contrast agent into the fistula with the blind end, after the guide tube passes through the fistula, the guide wire is slowly pulled out, the control valve is opened, the redundant space generated in the catheter when the guide wire is pulled out can be filled with the contrast agent under the contraction of the elastic bag, the pressure generated by the contraction of the elastic bag on the contrast agent can not cause the sealing valve to be opened, when the guide wire is pulled out to the position of the end part of the guide wire at the through hole, the guide wire is sheared, the trend of the fistula can be judged by the contrast agent in the catheter, the elastic bag can be pinched, the pressure is increased to cause the sealing valve to be opened, the contrast agent can be selected according to the situation, the situation that the contrast agent is greatly diffused in the inner opening of the fistula can not be caused, the trend of the fistula can be more clearly explored, and the use is simpler and more convenient.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a cross-sectional view of a connection portion of the present utility model;

FIG. 3 is a cross-sectional view of the free end of the catheter of the present utility model;

fig. 4 is a partially exploded view of the present utility model.

Reference numerals: 1. a conduit; 2. a guide wire; 3. a connection part; 4. a grip portion; 5. inserting a convex block; 6. a connector; 7. an elastic bag; 8. a control valve; 9. a mounting head; 10. a partition plate; 11. a communication chamber; 12. sealing the cavity; 13. a through hole; 14. sealing the valve.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown.

In this embodiment, as shown in fig. 1 to 4, a guiding tube for injecting contrast agent into a fistula of skin includes a flexible catheter 1 and a guide wire 2 inserted into the catheter 1, the material of the catheter 1 may be made of a hose material with a retention needle located in a blood vessel in the prior art, and the catheter 1 is soft, so that the guide wire 2 is disposed inside the catheter 1 to provide a certain supporting strength, so that the catheter 1 can pass through a narrow or inner wall-attached position in the fistula, one end of the catheter 1 is provided with a connecting portion 3, a connecting cavity communicated with the catheter 1 is disposed in the connecting portion 3, a holding portion 4 is disposed at an end of the guide wire 2, an insertion protrusion 5 is integrally formed on the holding portion 4, and the insertion protrusion 5 is in insertion fit with the connecting cavity. The guide wire 2 has the function of providing a certain stiffness to the catheter 1 and avoiding the catheter 1 from coiling in the fistula after encountering resistance in the fistula. In specific use, the insertion projection 5 is inserted into the connection cavity, and then the free end of the catheter 1 is inserted into the fistula and the catheter 1 is continuously inserted into the fistula. The following treatments were further performed depending on the fistula conditions: 1. in the case of a fistula without an internal port, i.e., only the external port through which catheter 1 is inserted, after the catheter 1 is inserted into the innermost part of the fistula, the guidewire 2 is withdrawn while the lumen 11 is closed, and then a contrast medium is injected into the fistula through catheter 1, after which a passage of the fistula is formed by contrast. (if the fistula tract is small, contrast may not be allowed to enter the fistula due to the air pressure inside the fistula, or may be injected while the catheter is withdrawn. 2. If the fistula is a fistula with a skin fistula opening and an inner opening, the catheter 1 is extended out of the inner opening, the position of the inner opening can be precisely positioned through a cavity (such as an oral cavity and a nasal cavity) of the inner opening, and the contrast agent is injected into the catheter 1 until the contrast agent stops when the contrast agent is about to be discharged from the other end of the catheter 1, then the contrast is carried out, and the whole process of the fistula is tracked through the contrast agent in the catheter 1. According to the utility model, through the cooperation of the catheter 1 and the guide wire 2, the fistula can be penetrated into the blind end in the fistula or reach the inner opening, the fistula part attached to the inner wall is propped up, and the contrast agent is better injected into the fistula, so that the trend of the fistula can be explored before operation.

In order to improve the injection efficiency of the contrast agent, the side wall of the connecting part 3 is provided with a hollow connector 6 communicated with the connecting cavity, after the catheter 1 is inserted in place during operation, the contrast agent can be synchronously injected into the catheter 1 while the guide wire 2 is pulled out, so that the working efficiency can be improved, but the attention is paid to the fact that the connecting cavity is opened when the guide wire 2 is pulled out, so that the contrast agent flows out from the connecting cavity, and therefore, medical staff needs to seal the connecting cavity by fingers or other equipment in the working process, and only one small hole is reserved for the guide wire 2 to be pulled out.

Specifically, the side of connecting portion 3 is equipped with the elastic bag 7 that is used for holding the contrast medium, the exit of elastic bag 7 is equipped with control valve 8, the play liquid end of control valve 8 is equipped with installation head 9, pass through threaded connection between installation head 9 and the connector 6, before the work, inject the contrast medium in the elastic bag 7 earlier for elastic bag 7 inflation, afterwards close control valve 8, with installation head 9 and connector 6 threaded connection, after catheter 1 inserts in place, when taking out seal wire 2, open control valve 8, the contrast medium in the elastic bag 7 can be in automatic injection catheter 1 under the shrinkage force of elastic bag 7, thereby can improve the injection efficiency of contrast medium.

In order to avoid contrast agent leakage caused by the connection cavity and the external communication of the guide wire 2 when the guide wire 2 is pulled out, a partition plate 10 is arranged in the connection cavity, the connection cavity is divided into a communication cavity 11 and a sealing cavity 12 by the partition plate 10, the sealing cavity 12 is in plug connection with the plug-in protruding block 5, the communication cavity 11 is communicated with the connector 6, a through hole 13 used for communicating the sealing cavity 12 and the communication cavity 11 is arranged on the partition plate 10, the aperture of the through hole 13 is equal to the diameter of the guide wire 2, and the guide wire 2 still blocks the through hole 13 when the guide wire 2 is pulled out, so that the inside of the communication cavity 11 is always kept in a sealing state, and when the guide wire 2 is pulled out to the last part to be left in the through hole 13, the guide wire 2 can be cut off, so that the part of the guide wire 2 is continuously left in the through hole 13 to play a role of blocking. In order to ensure the blocking effect of the guide wire 2 and the through hole 13, the aperture of the through hole 13 can be smaller than the diameter of the guide wire 2, the partition plate 10 is made of elastic materials, the through hole 13 can be expanded, and the guide wire 2 cannot pass through the through hole 13.

Since a lot of space is left in the catheter 1 when the guide wire 2 is drawn out, if the free end of the catheter 1 is open, in the process, air may enter the catheter 1 and cause contrast agent in the catheter 1 to leak out, and for fistulae with both outer and inner openings, the amount of contrast agent in the inner opening is uncontrolled, which affects the operation, therefore, a plurality of sealing valves 14 are arranged inside the end of the catheter 1 far away from the connecting part 3, which can play a certain sealing effect on the free end of the catheter 1, and in addition, when the contrast agent is introduced into the catheter 1, after the pressure in the catheter 1 is increased, the sealing valves 14 can be extruded to open, so that the injection of the contrast agent is not affected.

In particular, the sealing valve 14 is more than 3 mm from the free end of the catheter 1, and if the sealing valve 14 is too close to the end of the catheter 1, it may interfere with the patient's body, resulting in the sealing valve 14 subsequently failing to open under the effect of contrast pressure.

Specifically, the end of the guidewire 2 remote from the grip 4 is received inside the catheter 1.

Specifically, the catheter 1 is provided with a scale value gradually increasing from the free end of the catheter 1 to the connecting part 3, and the depth of the fistula can be primarily judged through the scale value.

The working principle of the utility model is as follows: firstly, contrast agent is injected into the elastic bag 7, the elastic bag 7 is inflated, the control valve 8 is closed, the connector 6 and the mounting head 9 are connected together, other structures are assembled during production, the guide wire 2 is inserted into the catheter 1, the control valve 8 is opened firstly, part of contrast agent flows into the communicating cavity 11 and the catheter 1 under the shrinkage of the elastic bag 7 or manually pinching the elastic bag 7, the inside of the communicating cavity is filled with the contrast agent, and the catheter 1 is inserted into the fistula until the penetrating depth is reached. Then dividing into two working conditions, namely 1, a fistula with an external orifice, after the catheter 1 is inserted into the deepest part, drawing out the guide wire 2, simultaneously pinching the elastic bag 7, injecting contrast agent into the fistula through the catheter 1 until a sufficient amount is injected, and then carrying out contrast judgment on the shape of the fistula. 2. Through the fistula, after the catheter 1 passes through the fistula, the guide wire 2 is slowly pulled out, the control valve 8 is opened, the redundant space generated in the catheter 1 when the guide wire 2 is pulled out can be filled with contrast agent under the contraction of the elastic bag 7, the sealing valve 14 can not be opened due to the pressure generated by the contraction of the elastic bag 7 on the contrast agent, when the guide wire 2 is pulled out to the position of the end part at the through hole 13, the guide wire 2 is sheared, the trend of the fistula can be judged through the contrast agent in the catheter 1, the elastic bag 7 can be pinched, the pressure is increased to open the sealing valve 14, the contrast agent flows into the fistula, and the fistula can be selected according to the situation.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. A guide tube for injecting contrast agent into a fistula of skin, characterized in that: including soft pipe (1) and guide wire (2) of interlude in pipe (1), the one end of pipe (1) is equipped with connecting portion (3), be equipped with in connecting portion (3) with the connecting chamber of pipe (1) intercommunication, the tip of guide wire (2) is equipped with grips portion (4), integrated into one piece has grafting lug (5) on grips portion (4), grafting lug (5) are pegged graft with the connecting chamber and are cooperated.

2. A guide tube for injecting contrast agent into a fistula of skin of claim 1, wherein the guide tube comprises: the side wall of the connecting part (3) is provided with a hollow connector (6) communicated with the connecting cavity.

3. A guide tube for injecting contrast agent into a fistula of skin according to claim 2, wherein the guide tube comprises: the side of connecting portion (3) is equipped with elastic bag (7) that are used for holding contrast medium, the exit of elastic bag (7) is equipped with control valve (8), the play liquid end of control valve (8) is equipped with installation head (9), pass through threaded connection between installation head (9) and connector (6).

4. A guide tube for injecting contrast agent into a fistula of skin of claim 1, wherein the guide tube comprises: the utility model discloses a wire guide wire, including connecting cavity, sealing lug (5), connecting cavity, division board (10) are equipped with in the connecting cavity, division board (10) separates into intercommunication chamber (11) and sealed chamber (12) with the connecting cavity, sealed chamber (12) are pegged graft the cooperation with grafting lug (5), intercommunication chamber (11) and connector (6) intercommunication, be equipped with through-hole (13) that are used for communicating sealed chamber (12) and intercommunication chamber (11) on division board (10), and the aperture of through-hole (13) equals the diameter of seal wire (2).

5. A guide tube for injecting contrast agent into a fistula of skin of claim 1, wherein the guide tube comprises: the inside of one end of the catheter (1) far away from the connecting part (3) is provided with a plurality of sealing valves (14).

6. A guide tube for injecting contrast agent into a fistula of skin of claim 5, wherein the guide tube comprises: the sealing valve (14) is located at a distance of more than 3 mm from the free end of the catheter (1).

7. A guide tube for injecting contrast agent into a fistula of skin of claim 5, wherein the guide tube comprises: one end of the guide wire (2) far away from the holding part (4) is accommodated in the catheter (1).

8. A guide tube for injecting contrast agent into a fistula of skin of claim 1, wherein the guide tube comprises: the guide tube (1) is provided with scale values which gradually increase from the free end of the guide tube (1) to the connecting part (3).