CN110811763A - Fetching catheter and method for endoscope - Google Patents

Abstract

The invention discloses an object taking catheter for an endoscope, which comprises a handle assembly, an outer sheath tube and an inner core assembly, wherein a pipeline is arranged in the handle assembly, one end of the handle assembly is connected and communicated with the outer sheath tube, the other end of the handle assembly is provided with an inner core interface and an attraction interface, and the inner core interface and the attraction interface are respectively communicated with the pipeline in the handle assembly; the inner core assembly can be arranged in the outer sheath tube in a penetrating way through the inner core interface; the handle component can be externally connected with a negative pressure source through the suction interface to form negative pressure adsorption force at the front end of the outer sheath tube. When the fetching catheter is applied, the fetching catheter extends out of an endoscopic forceps channel to reach an operation area; in the fetching operation process, the fetching catheter is externally connected with a negative pressure source, and the front end of the outer sheath tube in the fetching catheter forms negative pressure adsorption force. The fetching catheter scheme provided by the invention integrates fetching, attracting and other functions, and provides a brand-new solution for realizing the fetching operation of tiny stones or muddy substances.

Description

Fetching catheter and method for endoscope

Technical Field

The invention relates to an endoscope technology, in particular to an endoscope-based fetching technology.

Background

With the popularization and improvement of endoscopic diagnosis and treatment technologies, the application of ERCP (endoscopic retrograde cholangiopancreatography) is increasing. In the current bile duct calculus removing operation, common calculus removing instruments comprise an endoscope calculus removing basket, an endoscope calculus removing balloon and the like.

The endoscope calculus-taking basket mainly has the advantages that the endoscope forceps channel is used for entering a calculus part, the handle is used for controlling the opening and closing of the head of the basket, the head of the basket is made to capture calculus, and the calculus is taken out.

The endoscope calculus removing balloon has the main functions that the endoscope forceps channel is used for entering a calculus part, the balloon is opened by injecting gas or water into the balloon, and the calculus is taken out by moving the balloon.

In the operation process, a plurality of tiny stones or mud-shaped substances cannot be taken out through the endoscope calculus-taking basket and the endoscope calculus-taking saccule, so that the operation is not thorough, and the risk of disease recurrence is left.

Therefore, the scheme for fetching substances such as tiny stones or mud and the like based on an endoscope is a problem which needs to be solved in the field.

Disclosure of Invention

Aiming at the problem that substances such as tiny calculus or mud and the like cannot be effectively taken out in the existing operation process by the existing endoscope scheme, the invention aims to provide an object taking catheter for an endoscope, which integrates the functions of object taking, attraction and the like; and provides an endoscope-based fetching method based on the fetching catheter.

In order to achieve the purpose, the fetching catheter for the endoscope comprises a handle assembly, an outer sheath tube and an inner core assembly, wherein a pipeline is arranged in the handle assembly, one end of the handle assembly is connected and communicated with the outer sheath tube, the other end of the handle assembly is provided with an inner core interface and an attraction interface, and the inner core interface and the attraction interface are respectively communicated with the pipeline in the handle assembly; the inner core assembly can be arranged in the outer sheath tube in a penetrating way through the inner core interface; the handle component can be externally connected with a negative pressure source through the suction interface to form negative pressure adsorption force at the front end of the outer sheath tube.

Further, the inner core subassembly is including getting the thing seal wire, it includes front end seal wire section, spiral section, hose section, hard tube section and operation section in proper order to get the thing seal wire.

Further, the spiral section is of a spring structure.

Further, the inner core assembly includes a guide wire disposable within the outer sheath via the inner core interface.

Further, the inner core subassembly includes spacing subassembly, spacing subassembly sets up with getting the cooperation of thing seal wire.

Further, the handle assembly comprises a handle body and a sleeve; the handle is characterized in that a pipeline is arranged in the handle body, a sleeve is arranged at one end of the handle body, and an inner core interface and a suction interface which are communicated with the pipeline are arranged at the other end of the handle body.

Further, a sealing structure is arranged at the interface of the inner core.

Furthermore, a tip necking structure is arranged at the front end of the outer sheath tube.

In order to achieve the above object, the present invention provides an endoscope-based fetching method, comprising:

extending the fetching catheter to an operation area through an endoscopic forceps channel;

in the operation process of fetching an object based on the inner core assembly in the fetching catheter, the fetching catheter is externally connected with a negative pressure source, and the front end of the outer sheath tube in the fetching catheter forms negative pressure adsorption force.

Further, in the fetching method, the object to be fetched is moved to the front end of the outer sheath tube through the back-and-forth movement or the rotation of the inner core assembly in the fetching catheter.

The fetching catheter scheme provided by the invention integrates fetching, attracting and other functions, and provides a brand-new solution for realizing the fetching operation of tiny stones or muddy substances.

Moreover, when the fetching catheter scheme provided by the invention is used together with an endoscope, the operation procedures and application scenes of the related endoscope can be enriched, and when the fetching catheter scheme is used for actual treatment, the probability of relapse or complication of a patient can be reduced, so that the fetching catheter scheme has higher clinical value.

Drawings

The invention is further described below in conjunction with the appended drawings and the detailed description.

FIG. 1 is a schematic view showing the construction of an extraction tube for an endoscope in this example;

FIG. 2 is a schematic cross-sectional view of the whole of an extraction catheter for an endoscope in this example;

FIG. 3 is a schematic view of the handle assembly of the retrieval guidewire of the present example;

FIG. 4 is a schematic view of an extraction guide wire in the extraction catheter for endoscope in this example;

fig. 5 is a schematic view of the tip of the fetching guide wire in this example.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

Aiming at the problem that the existing endoscope is not easy to take out small stones or muddy substances in the using process, the negative pressure adsorption is innovatively matched with the conventional endoscope fetching operation, so that the small stones or muddy substances are efficiently extracted through the endoscope.

Therefore, the embodiment provides an extraction catheter which can be matched with a conventional endoscope, and can simultaneously generate negative pressure adsorption force to extract small stones or mud-like substances and the like when the conventional endoscopic extraction operation is carried out in a narrow and operable space (such as an endoscopic forceps channel).

Referring to fig. 1 and 2, there is shown an example of the composition of the extraction duct 100 given in this example.

As shown in the figure, the fetching conduit 100 mainly comprises three main components, namely a handle component 110, an outer sheath 120 and an inner core component 130.

The handle assembly 110 is used as the main body of the whole fetching conduit 100, and a cavity is arranged in the handle assembly as a pipeline, and is used as a mounting conduction channel and a later fetching channel of the inner core assembly 130.

By way of example, the duct in the handle assembly 110 is disposed along the extending direction of the handle assembly 110, one end of the duct extends directly to the top end of the handle assembly 110 and is conducted, the other end of the duct extends to the tail end of the handle assembly 110, and is provided with an inner core interface 111 and a suction interface 112 which are conducted to the outside, where the inner core interface 111 is used for being installed in the handle assembly 110 in cooperation with the inner core assembly 130, and the suction interface 112 is used for being externally connected with a negative pressure source to form negative pressure in the duct in the handle assembly 110.

On this basis, the outer sheath 120 is connected to the top end of the handle assembly 110 and is in communication with the conduit inside the handle assembly 110 to serve as an extension end.

The inner core assembly 130 can be inserted into the outer sheath tube 120 through the inner core interface 111 of the handle assembly 110 for performing a conventional endoscopic procedure. Further, the handle assembly may be externally connected to a negative pressure source through the suction port 112 to form a negative pressure suction force at the front end of the sheath tube 120, thereby forming a suction force at the front end of the sheath tube 120.

The following description will exemplify a specific configuration of the extraction duct 100 with reference to the accompanying drawings.

Referring to fig. 2 and 3, the handle assembly 110 of the present extraction catheter 100 is mainly formed by the handle body 113 and the sleeve 114.

The handle body 113 has a specific structure according to actual requirements, and a pipe is arranged in the handle along the extending direction of the handle body. The handle body 113 is provided at a front end thereof with a sleeve 114 for connecting with the outer sheath tube 120, so as to connect the outer sheath tube 120 with the handle body 113 and communicate with the inner duct of the handle body 113.

The sleeve 114 is preferably of a hose construction in order to facilitate connection of the sheath 120 to the stem 113 and to ensure reliable connection. The connection and matching manner between the sleeve 114 and the handle 113 and the sheath 120 can be determined according to actual requirements, and is not limited herein.

The handle body 113 is provided at the rear end thereof with a core interface 111 and a suction interface 112. The suction port 112 is located at the rear end of the stem 113 and communicates with a duct in the stem 113. The suction port 112 is used for externally connecting a negative pressure source (e.g., a suction pump) to achieve negative pressure suction at the front end of the sheath tube 120. When fetching the object, the suction pump is connected to the handle suction interface, the suction pump is started, and the negative pressure suction is realized at the front end of the sheath tube 120.

The inner core interface 111 on the handle body 113 is positioned at the rear end of the handle body, is opposite to the suction interface 112, and is communicated with the pipeline in the handle body 113. The inner core interface 111 is used for matching with the inner core assembly 130, and the inner core containing assembly 130 enters the channel in the handle body 113 and the outer sheath 120 through the inner core interface 111, and then extends out from the front end of the outer sheath 120 to the area needing to be operated.

In order to avoid influencing the operation of negative pressure suction based on the suction interface 112, the sealing assembly is arranged at the inner core interface 111 to realize the dynamic sealing fit with the inner core assembly 130, so that the negative pressure state in the handle body 113 is not influenced when the inner core assembly 130 is operated, and the stability of the negative pressure at the front end of the outer sheath tube 120 is further ensured.

The core interface 111 of the handle 113 may be formed by a luer or a tower fitting, for example.

The outer sheath 120 of the present extraction catheter 100 is attached at its rear end to the sleeve 114 and to the channel in the shaft 113.

The specific structure of the outer sheath 120 may be determined according to actual requirements. The outer sheath in this example is preferably made of a polymeric material for the particular application environment of the outer sheath 120.

Further, the front end of the sheath tube 120 in this example has a tip-end necking structure, thereby providing a guiding function, and the delay slope of the necking structure can prevent the end edge of the sheath tube from damaging the instrument.

The inner core assembly 130 of the fetching catheter 100 mainly comprises a fetching guide wire 131, a guiding guide wire (not shown in the figure), a limit stop (not shown in the figure), a guiding guide wire and a limit block, which are parts.

Referring to fig. 4 and 5, an example of a composition of the retrieval guidewire 131 in this example is shown.

As can be seen from the figure, the retrieval guide wire 131 includes a distal end guide wire segment 131a, a spiral segment 131b, a flexible tube segment 131c, a rigid tube segment 131d, and an operation portion 131e in this order from front to back.

The distal guide wire segment 131a is a distal end of the fetching guide wire 131, and is preferably made of a hard wire for guiding. In practical application, the device can be used for guiding an extraction guide wire to pass through a focus.

The helical section 131b is disposed behind the leading wire section 131 a. The preferred helical section 131b is preferably a soft wire spring structure to facilitate the removal operation. Therefore, when the device is actually used, after the front end of the fetching guide wire is guided to pass through a focus, foreign matters at the focus are easy to attach to the soft wire spring, and fetching operation is convenient.

The hose section 131c is arranged behind the spiral section 131 b. The flexible guide wire is preferably designed by a soft wire or a spring, and the bending performance can be realized, so that the whole fetching guide wire is more flexible to operate.

After the hard tube segments 131d are distributed on the flexible tube segments 131c, the hard tube segments form a main structure of the whole fetching guide wire, and preferably are designed to be hard wires, so that force transmission is realized, and in the practical application process, if a blocked situation is met, the fetching guide wire is easy to be stressed and pass.

The operation portion 131e is distributed behind the hard tube segment 131d, and constitutes the tail end of the entire fetching guide wire. The operation portion 131e is located outside the inner core interface 111 when the fetching guide wire is inserted into the handle assembly 110 through the inner core interface 111, so that the user can operate the fetching guide wire to move or rotate. For example, the operating portion 131e may have a ring structure as shown in the figure.

In addition, get the thing seal wire operation and can connect a plurality of limit stop according to actual operation needs, the restriction is got the thing seal wire and is got into the internal length of patient, avoids the injury. The limit stop is arranged at the inner core interface, and different limit stops can be added by an operator according to actual conditions. The specific arrangement scheme can be determined according to actual requirements, and is not limited herein.

Here, the arrangement and proportion of the front end guide wire segment 131a, the spiral segment 131b, the flexible tube segment 131c, the hard tube segment 131d and the operation portion 131e in the fetching guide wire 131 may be determined according to actual requirements, and is not limited herein.

In addition, in practical application, the rear end of the outer sheath tube is connected with the head end of the inner core interface.

On the basis of the scheme, the embodiment can be further added with a guide wire, when the guide wire is used as an accessory removable catheter, the guide wire is arranged in the outer sheath through the inner core interface to guide the action of the removable catheter, so that the main body part of the removable catheter can smoothly reach the preset position. For example, the handle assembly and the outer sheath tube in the fetching catheter reach a predetermined position along the guide wire, the guide wire is withdrawn, and the operation part 131e is held by hand, so that the fetching guide wire enters from the inner core joint to reach the predetermined position.

When the fetching catheter formed by the method is applied, the fetching catheter stretches out to the position near the focus of a patient through an endoscope channel, the fetching guide wire is inserted into the outer sheath tube through the handle inner core interface under the endoscope direct-view lens and reaches the focus position, so that the moving of the fetching guide wire at the focus is realized through operating the operation part at the rear end of the fetching guide wire, and the purpose of fetching objects is achieved. In addition, when the object taking operation is carried out, the suction pump can be connected to the suction port on the object taking catheter, the suction pump is started, and negative pressure suction is realized at the front end of the outer sheath tube.

On the basis, the fetching guide wire can move back and forth or rotate by operating the operation part, so that the small calculus or the muddy substance is moved to the front end of the outer sheath tube and is taken out of the body by suction.

The following illustrates the application of the extraction catheter.

Taking the cholangioplasty as an example, the fetching catheter reaches the vicinity of papillary muscles of duodenum through a duodenoscope and extends out through an endoscopic forceps channel.

Firstly, the guide wire enters the bile duct through the duodenal papilla, after reaching a designated position, the outer sheath tube enters the bile duct along the guide wire, and the necking design enables the entering process to be smoother.

After the outer sheath tube enters the designated position, withdrawing the guide wire from the interface of the handle inner core; inserting the fetching guide wire into the outer sheath tube through the handle inner core interface and to the focus part; and connecting the suction pump to a handle suction interface, starting the suction pump, and realizing negative pressure suction at the front end of the sheath tube.

The fetching guide wire moves in the bile duct by operating the fetching guide wire operating part, and the tiny calculus or muddy substances are moved to the front end of the outer sheath tube by moving back and forth or rotating, and are taken out of the body by attraction.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The fetching catheter for the endoscope is characterized by comprising a handle assembly, an outer sheath pipe and an inner core assembly, wherein a pipeline is arranged in the handle assembly, one end of the handle assembly is connected and communicated with the outer sheath pipe, the other end of the handle assembly is provided with an inner core interface and an attraction interface, and the inner core interface and the attraction interface are respectively communicated with the pipeline in the handle assembly; the inner core assembly can be arranged in the outer sheath tube in a penetrating way through the inner core interface; the handle component can be externally connected with a negative pressure source through the suction interface to form negative pressure adsorption force at the front end of the outer sheath tube.

2. The catheter for endoscopic extraction as defined in claim 1, wherein the inner core assembly comprises an extraction guide wire, which comprises a front end guide wire section, a spiral section, a flexible tube section, a hard tube section and an operation section in sequence.

3. The extraction catheter for an endoscope, according to claim 2, wherein said helical segment is of a spring structure.

4. The access catheter for an endoscope of claim 2, wherein the inner core assembly comprises a guide wire disposable within an outer sheath via an inner core interface.

5. The fetching catheter for an endoscope according to claim 2, wherein the inner core assembly comprises a limiting assembly, and the limiting assembly is disposed in cooperation with the fetching guide wire.

6. The access catheter for an endoscope of claim 1, wherein said handle assembly comprises a handle body and a cannula; the handle is characterized in that a pipeline is arranged in the handle body, a sleeve is arranged at one end of the handle body, and an inner core interface and a suction interface which are communicated with the pipeline are arranged at the other end of the handle body.

7. The extraction catheter for an endoscope, according to claim 6 or 7, wherein a sealing structure is provided at said inner core interface.

8. The taking catheter for an endoscope, according to claim 1, wherein a tip end necking structure is provided at a front end of the outer sheath.

9. An endoscope-based fetching method, comprising:

extending the access catheter of any one of claims 1-8 through the endoscopic forceps channel to an operative field;

in the operation process of fetching an object based on the inner core assembly in the fetching catheter, the fetching catheter is externally connected with a negative pressure source, and the front end of the outer sheath tube in the fetching catheter forms negative pressure adsorption force.

10. The endoscope-based retrieval method of claim 9, wherein the retrieval method is to move the object to be retrieved to the front end of the outer sheath by back and forth movement or rotation of the inner core assembly in the retrieval catheter.

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