WO2018214407A1

WO2018214407A1 - Planar deflectable catheter

Info

Publication number: WO2018214407A1
Application number: PCT/CN2017/109265
Authority: WO
Inventors: 苏晞; 胡清; 蒋彬; 刘继勇; 秦泗海; 刘刚
Original assignee: 科塞尔医疗科技苏州有限公司
Priority date: 2017-05-22
Filing date: 2017-11-03
Publication date: 2018-11-29
Also published as: CN107174332A; CN107174332B

Abstract

A planar deflectable catheter (100), comprising: a catheter main body (10) and an adjusting structure (20). The catheter main body (10) has a long and thin tubular shape and is flexible. The adjusting structure (20) comprises a handle (22), a plunger (21), a sleeve (23), and a pull wire (24). The plunger (21) is connected to the catheter main body (10). The sleeve (23) is received inside the catheter main body (10). The handle (22) and the sleeve (23) are connected to the respective two ends of the pull wire (24). The sleeve (23) is fixed to the plunger (21). The sleeve (23) extends through the catheter main body (10). The plunger (21) is movably attached to the handle (22). The plunger (21) moves relative to the handle (22) to bend the sleeve (23) so as to bend the catheter main body (10). Relative displacement between the handle (22) and the plunger (21) is controlled, so that planar deflection of the catheter main body (10) can be controlled, achieving controllable deflection of a distal plane of the catheter main body (10), enhancing precision in position-locating operations performed by doctors, and improving surgical success rates and therapeutic efficacy.

Description

Catheter with planar deflection characteristics

Technical field

The present invention relates to the field of medicine, and more particularly to a catheter having planar deflection characteristics.

Background technique

At present, in medical interventional catheterization, it is often necessary to use a catheter with planar deflection characteristics in order to adapt to the bending of the blood vessel during surgery and to successfully complete the operation.

However, existing catheters with planar deflection characteristics have the following drawbacks:

(1) The plane deflection characteristics of the catheter are poor, and the curved section of the catheter will be tilted relative to the plane of the catheter during bending, which is not conducive to the operation of the operator, and the accurate positioning of the tip of the catheter cannot be achieved, which seriously affects the use effect of the catheter. .

(2) The fixed part may be broken due to poor welding.

(3) The lead electrode is a one-time use consumable, and the existing product electrode lead and the curved control component have an integral design structure, and the manufacturing cost thereof is relatively high, and the price of foreign imported products is up to 10,000 yuan, which greatly increases the treatment of the patient. cost.

Summary of the invention

In order to overcome the deficiencies of the prior art, it is an object of the present invention to provide a catheter having planar deflection characteristics that solves the problem of accurate positioning of the catheter tip.

One of the objects of the present invention is achieved by the following technical solutions:

A catheter having planar deflection characteristics, comprising: a catheter body and an adjustment structure, the catheter body being elongated and tubular and flexible, the adjustment structure comprising a handle, a push rod, a sleeve and a pull wire, the push rod and the The catheter body is connected, the sleeve is received in the catheter body, and the two ends of the wire are respectively fixed with the handle and the sleeve, and the sleeve is fixed Positioned on the push rod, the sleeve extends through the catheter body, the push rod is movably mounted to the handle, and the push rod moves relative to the handle to bend the sleeve to drive the catheter The body is bent.

Further, the duct body comprises a main body segment and a curved section, the curved section is more flexible than the main body section, the handle is provided with a guiding slot, the push rod is received in the guiding slot, and the push rod is provided a connecting hole communicating with the guiding groove, the sleeve comprising a first sleeve and a second sleeve, the first sleeve being matched with the main body section, the second sleeve being The curved segments are matched; the pull wire includes a first pull wire and a second pull wire, the first pull wire is matched with the main body segment, and the second pull wire is matched with the curved segment.

Further, the push rod further includes an elastic damping ring and a guiding portion, wherein the guiding portion is provided with a sealing groove, and the elastic damping ring is received in the sealing groove.

Further, the sleeve is more flexible than the pull wire, and the second sleeve is more flexible than the first sleeve, and the second pull wire is more flexible than the first pull wire.

Further, the catheter body further includes a terminal electrode for tissue ablation and a first wire, the first wire and the terminal electrode are received in the body segment and the curved segment, and the first wire ends with the The terminal electrodes are connected and the other end passes through the curved section.

Further, the catheter body further includes at least one ring electrode adapted to be mapped and a second wire, the second wire being connected to the ring electrode at one end and passing through the curved segment at the other end.

Further, the catheter body further includes a terminal electrode and a temperature measuring line for temperature measurement, and one end of the temperature measuring line is connected to the terminal electrode, and the other end passes through the curved section.

Further, the catheter body further includes a buckle portion, and the push rod is provided with a snap groove. The buckle portion is buckled in the snap groove.

Further, the sleeve is tubular, and the cable is received in the sleeve and fixed to the sleeve by glue or welding.

Further, the sleeve and the wire are made of one of alloy, ceramic, carbon fiber, plastic, or a combination thereof.

Compared with the prior art, the beneficial effects of the present invention are:

By controlling the relative displacement of the handle and the push rod, the plane deflection of the catheter body can be controlled, and the distal plane of the catheter body can be controlled to deflect, which is convenient for the doctor to accurately locate and improve the success rate and treatment effect.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a preferred embodiment of a catheter having planar deflection characteristics.

Fig. 2 is a view showing the state of use of the catheter having the planar deflection characteristic shown in Fig. 1.

Figure 3 is a cross-sectional view of the catheter A-A having the planar deflection characteristics shown in Figure 1.

Figure 4 is a cross-sectional view of the catheter B-B having the planar deflection characteristics shown in Figure 1.

Figure 5 is a schematic illustration of the catheter body of the catheter of Figure 1 having planar deflection characteristics.

Fig. 6 is a schematic view showing the adjustment structure of the catheter having the plane deflection characteristic shown in Fig. 1.

In the figure: 100, a catheter with planar deflection characteristics; 10, a catheter body; 11, a body segment; 12, a curved segment; 13, a terminal electrode; 14, a ring electrode; 15, a first wire; a second wire; 17, a temperature measuring line; 18, a buckle portion; 20, an adjustment structure; 21, a push rod; 211, a guiding portion; 212, a snap groove; 213, a connecting hole; 214, an elastic damping ring; Handle; 221, guiding groove; 23, sleeve; 231, first sleeve; 232, second sleeve; 24, pull wire; 241, first pull wire; 242, second pull wire.

detailed description

The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments described below may be arbitrarily combined to form a new embodiment. .

It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or the component can be present. When a component is considered to "connect" another component, it can be directly connected to another component or possibly a central component. When a component is considered to be "set to" another component, it can be placed directly on another component or possibly with a centered component. The terms "vertical," "horizontal," "left," "right," and the like, as used herein, are for illustrative purposes only.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Referring to FIGS. 1-6, a preferred embodiment of the catheter 100 having planar deflection characteristics includes a catheter body 10 and an adjustment structure 20. Now set close to the end of the catheter body 10 For the distal end, the side closer to the adjustment structure 20 is the proximal end, which is better illustrated by the convenient embodiment.

The catheter body 10 has an elongated and flexible tubular shape, and includes a main body segment 11, a curved portion 12, a terminal electrode 13, a ring electrode 14, a first wire 15, a second wire 16, a temperature measuring wire 17, and a buckle portion 18. The curved section 12 is softer than the main body section 11, and the end electrode 13 and the first wire 15 for tissue ablation are accommodated in the main body segment 11 and the curved section 12, one end of the first wire 15 and the end The electrodes 13 are connected and the other end is passed through the curved section 12; the second wire 16 is connected at one end to the ring electrode 14 suitable for mapping, and the other end is passed through the curved section 12; One end of the temperature measuring line 17 is connected to the end electrode 13, and the other end passes through the curved section 12. Preferably, the catheter body 10 is a tube made of PEBAX or nylon to increase the torsional rigidity of the catheter body 10. The outer wall includes an embedded woven mesh made of stainless steel or similar material for enhanced strength. In this embodiment, the tubular body of the main body segment 11 is constructed by PEBAX and an embedded steel mesh, and the curved section 12 is made of PEBAX without a steel mesh. The outer diameter of the conduit body 10 is not critical, but preferably is not more than about 8F. (French), in other embodiments, the catheter body 10 may have an outer diameter of 7F and an inner diameter of 6F.

The adjustment structure 20 includes a push rod 21, a handle 22, a sleeve 23, and a pull wire 24. The push rod 21 includes a guiding portion 211 and an elastic damping ring 214 and is provided with a locking groove 212 and a connecting hole 213. The guiding portion 211 is provided with a sealing groove, and the elastic damping ring 214 is received in the sealing groove. The handle 22 is provided with a guiding slot 221, the sleeve 23 includes a first sleeve 231 and a second sleeve 232, the pull wire includes a first pull wire 241 and a second pull wire 242, and the guide portion 211 is received in the handle a guiding slot 221, the connecting hole 213 is in communication with the guiding slot 221, and one end of the pulling wire 24 is fixed to the handle 22 through the connecting hole 213, and One end is fixed to the sleeve 23, and the sleeve 23 is fixed to the push rod 21, and the sleeve is tubular. The elastic damping ring 214 is made of a highly elastic rubber material.

It should be noted that the first sleeve 231 is matched with the main body segment 11, the second sleeve 232 is matched with the curved section 12, and the first pull wire 241 is opposite to the main body segment 11. Matching, the second pull wire 242 matches the curved segment 12. The sleeve 23 is softer than the pull wire 24, and the second sleeve 232 is more flexible than the first sleeve 231, and the second pull wire 242 is more flexible than the first pull wire 241. The sleeve 23 and the wire 24 are made of one of alloy, ceramic, carbon fiber, plastic, or a combination thereof. The alloy may be a memory alloy or a non-memory alloy, preferably a wire mesh. The wire 24 is received in the sleeve 23 and fixed to the distal end of the sleeve 23 by glue or welding.

When the catheter 100 having the planar deflection characteristic is assembled, the fastening portion 18 is fastened to the locking groove 212 to fix the catheter body 10 to the adjustment structure 20. Preferably, the catheter body 10 and the adjustment structure 20 are The detachable connection, the catheter body 10 is a disposable consumable, and the adjustment structure 20 is reusable, which never reduces the cost of use of the patient; preferably, the handle 22 and the push rod 21 are further provided with a first pull wire 241 for docking, The first sleeve 231 and the wire connector of the temperature measuring line 17 (not shown), the wire connector can be connected to an external instrument such as a radio frequency generator or the like. The wire 24 of the present invention is not fixedly coupled to the end of the catheter body 10, and the end of the catheter body 10 is not subjected to the axial pulling force of the wire 24, thereby protecting the distal end of the catheter body 10, reducing the distal end of the catheter body 10 The risk of breaking off, greatly improving the safety of the product.

When using the catheter 100 with planar deflection characteristics, hold the handle 22 in one hand, and thumb up Referring to the push rod 21, the thumb moves the push rod 21 forward (distal) or backward (proximal), because the pull wire 24 is fixed in the handle 22, which is equivalent to tightening or loosening the pull wire 24, thereby driving the sleeve The bending or straightening of the portion 23, since the curved portion 12, the second sleeve 232, and the second pulling wire 242 are more flexible than the main body portion 11, the first sleeve 231, and the first wire 241, the body portion 11 does not have a curved curvature. The curved section 12 produces a plane deflection. By controlling the relative displacement of the handle 22 and the push rod 21, the plane deflection of the curved section 12 can be controlled, and the distal plane controllable deflection of the catheter body 10 can be achieved, which is advantageous for accurate positioning of the doctor, improving the success rate of the operation and the therapeutic effect.

It should be noted that, by pulling the wire 24, the sleeve 23 is bent, thereby driving the plane deflection of the curved section 12 of the catheter body 10. In other embodiments, the catheter body 10 is directly subjected to the pulling force of the wire 24, and the catheter body 10 is far. The end portion drives the bending of the curved portion 12, and the operation can also be completed. However, in the embodiment, the sleeve 23 integrally drives the bending portion 12 to deflect, and the bending portion 12 receives a more uniform bending force and better stability.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention belong to the present invention. The scope of the claim.

Claims

A catheter having planar deflection characteristics, comprising: a catheter body and an adjustment structure, the catheter body being elongated and tubular and having flexibility, the adjustment structure comprising a handle, a push rod, a sleeve and a pull wire, a push rod is coupled to the catheter body, the sleeve is received in the catheter body, and two ends of the wire are respectively fixed to the handle and the sleeve, and the sleeve is fixed to the push rod, A cannula extends through the catheter body, the pusher is movably mounted to the handle, and the pusher moves relative to the handle to bend the sleeve to cause the catheter body to flex.
A catheter having planar deflection characteristics according to claim 1, wherein said catheter body comprises a body portion and a curved section, said curved section being flexible than said body section, said handle being provided with a guiding groove, said handle The push rod is received in the guiding slot, the push rod is provided with a connecting hole, the connecting hole is in communication with the guiding slot, the sleeve comprises a first sleeve and a second sleeve, the first sleeve Matching with the main body segment, the second sleeve is matched with the curved section; the pull wire includes a first pull wire and a second pull wire, and the first pull wire matches the main body segment, the first The two pull wires match the curved segments.
The catheter with planar deflection characteristics according to claim 2, wherein the push rod further comprises an elastic damping ring and a guiding portion, the guiding portion is provided with a sealing groove, and the elastic damping ring is received in the sealing groove.
A catheter having planar deflection characteristics according to claim 2, wherein:

The sleeve is more flexible than the pull wire, and the second sleeve is more flexible than the first sleeve, and the second pull wire is more flexible than the first pull wire.
A catheter having planar deflection characteristics according to claim 2, wherein said catheter body further comprises a terminal electrode for tissue ablation and a first lead, said first lead The wire and the terminal electrode are received in the body segment and the curved segment, and one end of the first wire is connected to the terminal electrode and the other end is passed through the curved segment.
A catheter having planar deflection characteristics according to claim 2, wherein said catheter body further comprises at least one ring electrode adapted to be mapped and a second wire, one end of said second wire being connected to said ring electrode The other end passes through the curved section.
The catheter with planar deflection characteristics according to claim 2, wherein the catheter body further comprises a terminal electrode and a temperature measuring line for temperature measurement, and one end of the temperature measuring wire is connected to the terminal electrode, and One end passes through the curved section.
The catheter with planar deflection characteristics according to claim 5, wherein the catheter body further comprises a buckle portion, the push rod is provided with a snap groove, and the buckle portion is buckled to the buckle groove.
A catheter having planar deflection characteristics according to claim 1, wherein said sleeve is tubular, said wire is received in said sleeve and secured to said sleeve by glue or welding.
The catheter with planar deflection characteristics according to claim 1, wherein the sleeve and the wire are made of one of alloy, ceramic, carbon fiber, plastic, or a combination thereof.