CN218106558U - Medical tube and balloon catheter - Google Patents

Abstract

The utility model provides a medical tube and a balloon catheter, wherein the balloon catheter comprises an inner tube, the inner tube is the medical tube, the medical tube comprises a first tube and a second tube, and the second tube is sleeved on the outer surface of the first tube; wherein the second tube is a metal hypotube, and the friction coefficient of the inner surface of the first tube is smaller than the friction coefficient of the inner surface of the second tube. The medical tube has good pushing performance, and when the medical tube is sleeved on the guide wire and advances along the guide wire, the friction force generated between the medical tube and the guide wire is small, so that the smoothness of the medical tube during advancing is improved, and the prolongation of the operation time caused by retardation is avoided.

Description

Medical tube and balloon catheter

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to medical tubular product and sacculus pipe.

Background

Peripheral arterial disease is ischemic disease of the body caused by local stenosis or occlusion of peripheral arteries. The local stenosis or occlusion of the lower limb artery can cause intermittent claudication, cold skin on the leg or under the foot, chronic pain, gangrene and other symptoms. The main current treatments for ischemic diseases include drug therapy, surgical treatment and interventional therapy.

The balloon catheter can be used for interventional therapy of peripheral artery diseases, and can be applied to dilation of stenosis or occlusive lesions caused by atherosclerosis of arteries below inguinal (particularly comprising iliac artery, femoral artery, superficial femoral artery, popliteal artery, subcapital artery and the like). At present, a balloon catheter for peripheral arterial diseases adopts a stainless steel hypotube as an inner tube, and has excellent pushing performance and tracking performance. However, the friction coefficient of the stainless steel hypotube is large, so that the balloon catheter has large friction force in the pushing or withdrawing process along the guide wire, the movement of the balloon catheter is sluggish, and the operation time is prolonged.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a medical tubular product and sacculus pipe, medical tubular product is when the cover form moves on the seal wire and along the seal wire, has less frictional force between the two, can not cause the retardation to the removal of medical tubular product.

In order to achieve the purpose, the utility model provides a medical tube, which comprises a first tube body and a second tube body, wherein the second tube body is sleeved on the outer surface of the first tube body; wherein the second tube is a metal hypotube, and the friction coefficient of the inner surface of the first tube is smaller than the friction coefficient of the inner surface of the second tube.

Optionally, the medical tubing further comprises a third tube, and the third tube is sleeved on the outer surface of the second tube.

Optionally, the material of the first tube is polytetrafluoroethylene.

Optionally, a weakening structure is arranged on the first pipe body.

Optionally, the weakening structure is a groove, and the groove is disposed on the outer surface of the first tube body, or the groove penetrates through the tube wall of the first tube body.

Optionally, the groove is spirally wound along the axis of the first pipe body to form a spiral structure.

Optionally, the cross section of the first pipe body is circular or regular polygon.

Optionally, the first tube body is in interference fit with the second tube body.

Optionally, the distal end of the first tube and the distal end of the third tube both protrude from the distal end of the second tube, and the distal end of the first tube is connected to the distal end of the third tube; and/or the presence of a gas in the gas,

the near end of the second pipe body and the near end of the first pipe body are both protruded out of the near end of the third pipe body, and the near end of the second pipe body is connected with the near end of the first pipe body.

In order to achieve the above object, the present invention further provides a balloon catheter, comprising a catheter body and a balloon, wherein the catheter body comprises an outer tube and an inner tube, the inner tube is the medical tube as described in any one of the above, the inner tube is partially inserted into the outer tube, a liquid flow passage is formed between the outer surface of the inner tube and the inner surface of the outer tube, and the distal end of the inner tube extends from the distal end of the outer tube; the sacculus suit is in on the distal end surface of inner tube, and the distal end of sacculus with the distal end of inner tube is connected, the near-end of sacculus with the distal end of outer tube is connected, and still with the liquid flow way intercommunication.

Compared with the prior art, the utility model discloses a medical tubular product and sacculus pipe have following advantage:

the medical tubing comprises a first tube and a second tube, wherein the second tube is sleeved on the outer surface of the first tube; wherein the second tube is a metal hypotube, and the friction coefficient of the inner surface of the first tube is smaller than the friction coefficient of the inner surface of the second tube. The medical tube has pushing performance and flexibility, the inner cavity of the first tube body of the medical tube can be used as a guide wire cavity to allow the medical tube to move along the guide wire, and the friction resistance between the medical tube and the guide wire can be reduced when the medical tube moves along the guide wire due to the fact that the friction coefficient of the inner surface of the first tube body is small.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

fig. 1 is a schematic structural diagram of a medical tube according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a medical tube according to an embodiment of the present invention, in which a third tube is not shown;

FIG. 3 is a cross-sectional schematic view of the medical tubing shown in FIG. 1;

fig. 4 is a schematic structural view of a first tube of a medical tube according to an embodiment of the present invention;

fig. 5 is a schematic structural view of the medical tube according to an embodiment of the present invention, in which two ends of the first tube, the second tube and the third tube are not flush;

fig. 6 is a schematic structural view of a balloon catheter provided in accordance with an embodiment of the present invention;

FIG. 7 is a Y-Y cross-sectional view of the balloon catheter shown in FIG. 6;

FIG. 8 is a P-P cross-sectional view of the balloon catheter shown in FIG. 6;

FIG. 9 is a Y-Y sectional view of the balloon catheter shown in FIG. 6, the first tube of FIG. 9 having a cross-section of a shape different than that of FIG. 7;

fig. 10 is a P-P sectional view of the balloon catheter shown in fig. 6, the first tube body of fig. 10 having a cross-sectional shape different from that of fig. 8.

[ reference numerals are described below ]:

1-heat shrinkable tube;

10-catheter body, 100-inner tube, 110-first tube, 120-second tube, 130-third tube, 11-fluid flow path, 200-outer tube;

20-a balloon;

30-connector, 31-first joint, 32-second joint;

40-stress diffusion tube;

50-developing element.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.

Furthermore, each embodiment described below has one or more technical features, which does not mean that all technical features of any embodiment need to be implemented simultaneously by a person using the present invention, or that all technical features of different embodiments can be implemented separately. In other words, in the implementation of the present invention, based on the disclosure of the present invention, and depending on design specifications or implementation requirements, a person skilled in the art can selectively implement some or all of the technical features of any embodiment, or selectively implement a combination of some or all of the technical features of a plurality of embodiments, thereby increasing the flexibility in implementing the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, either a fixed connection or a releasable connection or an integral connection. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

To make the objects, advantages and features of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements.

As used herein, the terms "proximal" and "distal" refer to the relative orientation, relative position, and orientation of elements or actions with respect to one another from the perspective of a clinician using the medical device, and although "proximal" and "distal" are not intended to be limiting, the term "proximal" generally refers to the end of the medical device that is closer to the clinician during normal operation, and the term "distal" generally refers to the end that is first introduced into a patient.

Fig. 1 and fig. 2 show a schematic structural view of a medical tube provided in an embodiment of the present invention, and fig. 3 is a schematic cross-sectional view of the medical tube shown in fig. 1.

Referring to fig. 1 to 3, the medical tube includes a first tube 110 and a second tube 120, and the second tube 120 is sleeved on an outer surface of the first tube 110. The second tube 120 is a metal hypotube, and the friction coefficient of the inner surface of the first tube 110 is smaller than the friction coefficient of the inner surface of the second tube 120. The medical tubing may be used in a medical device comprising a tube assembly, such as a balloon catheter, such that the medical tubing may serve as the inner tube 100 of the balloon catheter (as labeled in fig. 7), such that the inner lumen of the first tube 110 serves as a guidewire lumen for a guidewire to be threaded therethrough, and such that the medical tubing is pushed or retracted along the guidewire during actual operation. Because the second tube 120 is a metal hypotube, the medical tube has good pushability and flexibility, so that the medical tube can conveniently pass through a tortuous blood vessel along the guide wire, and the friction coefficient of the inner surface of the first tube 110 is small, so that the friction resistance generated by the guide wire and the inner surface of the first tube 110 is small in the advancing process of the medical tube, and the prolongation of the operation time caused by the blockage of the medical tube in the advancing process is avoided. In this embodiment, the first tube 110 is made of Polytetrafluoroethylene (PTFE) or other polymer materials with a small surface friction coefficient, good biocompatibility, and no degradation in vivo.

The embodiment of the present invention does not particularly limit the shape of the cross section of the first pipe 110, and the cross section may be circular (as shown in fig. 2, 7 and 8), rectangular or regular polygonal, such as regular octagon (as shown in fig. 9 and 10), regular hexagon, etc., or even irregular.

Preferably, a weakening structure may be further disposed on the first tube 110 to reduce the rigidity of the first tube 110, thereby improving the flexibility of the medical tubing. Alternatively, the weakening structure is a groove 111 (as shown in fig. 4), the groove 111 may be disposed on the outer surface of the first tube 110, or the groove 111 may penetrate through the wall of the first tube 110. The groove 111 is preferably spirally wound along the axis of the first pipe body 110 to form a spiral structure.

The second tube 120 is formed with a void 121 by cutting, so that the second tube 120 forms a hypotube, the void 121 may form a spiral structure along an axis of the second tube 120, and the flexibility and the pushability of the second tube 120 are adjusted by adjusting a pitch of the spiral structure, thereby adjusting the flexibility and the pushability of the medical tubing.

Further, the medical tubing further comprises a third tube 130, and the third tube 130 is sleeved on the outer surface of the second tube 120. The embodiment of the present invention is not particularly limited to the material of the third tube 130, which can be made of any suitable polymer material.

The process of making the medical tubing is described next.

First, the first tube 110, the second tube 120, and the third tube 130 are provided, and the outer diameter of the first tube 110 is slightly larger than the inner diameter of the second tube 120.

Then, the second tube 120 is sleeved on the outer surface of the first tube 110, and the first tube 110 and the second tube 120 are in interference fit. And, the third pipe 130 is fitted over the outer surface of the second pipe 120. Moreover, the distal end of the third tube 130 protrudes beyond the distal end of the second tube 120, the distal end of the first tube 110 protrudes beyond the distal end of the third tube 130, the proximal end of the second tube 120 protrudes beyond the proximal end of the third tube 130, and the proximal end of the first tube 110 protrudes beyond the proximal end of the second tube 120 (as shown in fig. 5).

Then, the distal end of the first tube 110 is connected to the distal end of the third tube 130 by laser welding, and the portion of the distal end of the first tube 110 protruding beyond the distal end of the third tube 130 is cut off, so that the distal end of the first tube 110 is flush with the distal end of the third tube 130. And, sleeving a heat shrinkable tube 1 on the outer surface of the proximal end of the second tube 120 (as shown in fig. 5), and heating the heat shrinkable tube 1 to connect the proximal end of the second tube 120 with the proximal end of the first tube 110. Then, the heat shrinkable tube 1 is removed, and a portion of the proximal end of the first tube 110 protruding out of the second tube 120 is cut off, so that the proximal end of the first tube 110 is flush with the proximal end of the second tube 120.

Further, as shown in fig. 6 to 10, the embodiment of the present invention also provides a balloon catheter, which includes a catheter body 10 and a balloon 20. The catheter body 10 includes an inner tube 100 and an outer tube 200, the inner tube 100 is the medical tube, and the inner tube 100 is partially inserted into the outer tube 200, so that the inner lumen of the first tube 110 of the inner tube 100 is used as a guide wire lumen. The outer diameter of the inner tube 100 is smaller than the inner diameter of the outer tube 200 so that a liquid flow passage 11 is formed between the outer surface of the inner tube 100 and the inner surface of the outer tube 200. The distal end of the inner tube 100 extends from the distal end of the outer tube 200. The balloon 20 is fitted over the outer surface of the distal end of the inner tube 100, the distal end of the balloon 20 is connected to the distal end of the inner tube 100, the proximal end of the balloon 20 is connected to the distal end of the outer tube 200, and the proximal end of the balloon 20 is also in communication with the liquid flow passage 11 to allow the inflating agent to flow from the liquid flow passage 11, such as the balloon 20, and to inflate the balloon 20.

During actual work, a guide wire is guided into a human body along a blood vessel in advance, and the balloon catheter is sleeved on the guide wire through the guide wire cavity, so that the balloon catheter can enter the human body along the guide wire and enable the balloon 20 to reach a target position, and the balloon catheter is withdrawn from the body along the guide wire after treatment is finished. Because the inner surface of the guide wire cavity is the inner surface of the first tube body 110, the friction coefficient of the inner surface is small, so that the friction resistance between the balloon catheter and the guide wire is small in the process of advancing along the guide wire, the traveling path of the balloon catheter is smoother, and the phenomenon of blocking is avoided to prolong the operation time.

As will be appreciated by those skilled in the art, the balloon catheter further comprises a connector 30, the connector 30 being attached to the proximal end of the catheter body 10. The connector 30 comprises a first connector 31 and a second connector 32, wherein the first connector 31 is communicated with the inner tube 100 (i.e. communicated with the first tube 110) for passing the guide wire. The second connector 32 is in communication with the fluid flow path 11 and is adapted to be connected to an external syringe for infusing an inflation agent into the balloon 20. In addition, the balloon catheter further comprises a stress diffusion tube 40, which is sleeved on the outer surface of the proximal end of the outer tube 120 and is also connected with the distal end of the connecting piece 30, and is used for diffusing the stress applied to the proximal end of the catheter body 10.

Further, the outer surface of the distal end of the inner tube 100 is further provided with two developing elements 50, and the two developing elements 50 may be respectively arranged corresponding to the proximal end and the distal end of the balloon 20 for determining the position of the balloon 20 in the body. And when the filling agent comprises contrast fluid, the visualization element 50 may also be used to observe the contrast effect.

In addition, a hydrophilic coating (not shown) is disposed on the outer surface of the distal end of the balloon 20 and the outer tube 200 to reduce friction between the balloon catheter and the vessel wall.

To sum up, the embodiment of the utility model provides a medical tubular product that technical scheme provided reduces through the inlayer at the metal hypotube increase the first body that coefficient of surface friction is little medical tubular product advances along the seal wire when advancing and the frictional force that produces between the seal wire, improves the patency that medical tubular product advanced avoids operating time's extension. When the medical tube is applied to a balloon catheter or other medical devices comprising catheter bodies, only the structure of the medical tube is changed, the design of other structures, the production process, the sterilization and packaging of products and the like are changed, and the production and processing processes of the medical devices cannot be increased.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A medical tube is characterized by comprising a first tube body and a second tube body, wherein the second tube body is sleeved on the outer surface of the first tube body; wherein the second tube is a metal hypotube, and the friction coefficient of the inner surface of the first tube is smaller than the friction coefficient of the inner surface of the second tube.

2. The medical tubing of claim 1, further comprising a third tube nested over an outer surface of the second tube.

3. The medical tubing of claim 1 or 2, wherein the material of the first tube is polytetrafluoroethylene.

4. The medical tubing of claim 1, wherein the first tube body is provided with a weakening structure.

5. The medical tubing of claim 4, wherein the weakening structure is a groove disposed on an outer surface of the first tube or the groove extends through a wall of the first tube.

6. The medical tubing of claim 5, wherein the groove spirals around the axis of the first tube to form a spiral.

7. The medical tubing of claim 1 or 2, wherein the cross-section of the first tube is circular or regular polygonal.

8. The medical tubing of claim 1 or 2, wherein the first tube has an interference fit with the second tube.

9. The medical tubing of claim 2, wherein the distal end of the first tube and the distal end of the third tube both project beyond the distal end of the second tube, and the distal end of the first tube is connected to the distal end of the third tube; and/or the presence of a gas in the gas,

the near end of the second pipe body and the near end of the first pipe body are both protruded out of the near end of the third pipe body, and the near end of the second pipe body is connected with the near end of the first pipe body.

10. A balloon catheter, comprising a catheter body and a balloon, wherein the catheter body comprises an outer tube and an inner tube, the inner tube is the medical tubing of any one of claims 1-9, the inner tube is partially arranged in the outer tube in a penetrating way, a liquid flow passage is formed between the outer surface of the inner tube and the inner surface of the outer tube, and the distal end of the inner tube extends out of the distal end of the outer tube; the sacculus suit be in on the distal end surface of inner tube, just the distal end of sacculus with the distal end of inner tube is connected, the near-end of sacculus with the distal end of outer tube is connected, and still with the liquid flow channel intercommunication.

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