WO2021203766A1

WO2021203766A1 - Medical catheter and medical system

Info

Publication number: WO2021203766A1
Application number: PCT/CN2021/000065
Authority: WO
Inventors: 崔玉佳; 汪振; 王雄伟; 朱鑫建; 黄基锐
Original assignee: 微创优通医疗科技(嘉兴)有限公司
Priority date: 2020-04-08
Filing date: 2021-04-08
Publication date: 2021-10-14
Also published as: CN113491818A

Abstract

A medical catheter and a medical system. A treatment device comprises a medical catheter (100). The medical catheter (100) comprises a main catheter (110) having a hollow structure, the main catheter (110) comprises a catheter body (111), the catheter body (111) has an inner cavity penetrating along an axial direction of the catheter body, at least one inner liner layer (112) is provided on a cavity wall of the inner cavity, and the hardness of the inner liner layer (112) is greater than the hardness of the main catheter (110). The inner liner layer (112) is used for providing a supporting force for the catheter body (111), so that the main catheter (110) does not bend when traveling in the natural lumen of a human body or indwelling in the natural lumen of the human body, thereby improving the controllability and pushability of the main catheter (110), and improving the treatment effect.

Description

Medical catheter and medical system

Technical field

The invention relates to the technical field of medical devices, in particular to a medical catheter and a medical system.

Background technique

Adhesive Intestinal Obstruction (Adhesive Intestinal Obstruction) refers to the intestinal adhesions in the abdominal cavity caused by various reasons that cause the intestinal contents to not pass smoothly in the intestine. When the passage of intestinal contents is blocked, a series of symptoms such as abdominal distension, abdominal pain, nausea and vomiting, and bowel disorders will occur. Part of adhesive intestinal obstruction is small intestinal obstruction. Past survey statistics show that small intestinal obstruction accounts for about 40% of intestinal obstruction.

The current non-surgical treatment process for small bowel obstruction is mainly to insert a catheter into the patient’s stomach from the nasal cavity, adjust the patient’s position, make the catheter pass through the greater curvature of the stomach, and then enter the indwelling part of the small intestine, and then rely on the peristalsis of the small intestine to carry the catheter to the patient’s stomach. Obstruction site. When the catheter reaches the obstruction site from the indwelling site, a suction device is used to perform negative pressure suction to discharge the intestinal contents from the catheter. During this treatment, the catheter needs to be indwelled in the patient's body for 3-14 days. For patients with weak peristalsis, the indwelling time will be longer. The existing catheter used to treat intestinal obstruction is a long silicone tube with a soft texture. It has poor pushability and controllability during the process of pushing it to the obstructed site, and the small intestine bends during the indwelling period in the patient. Sections of the catheter are also prone to bends, which will cause the catheter to be blocked, affect the curative effect, and even need to reset the catheter.

Summary of the invention

The purpose of the present invention is to provide a medical catheter and a treatment device. The catheter is not easy to bend during the process of introducing the medical catheter into the patient's body, and has good controllability and pushability.

In order to achieve the above objective, the present invention provides a medical catheter, including a main catheter, the main catheter includes a tube body, the tube body has an inner cavity penetrating along its axial direction, and the cavity wall is provided with At least one inner lining layer, the hardness of the inner lining layer is greater than the hardness of the pipe body.

Optionally, the inner lining layer extends along the axial direction of the tube body, and the distal end of the inner lining layer is flush with the distal end of the tube body, and the proximal end of the inner lining layer is flush with the distal end of the tube body. The proximal end of the tube body is flush.

Optionally, the shore hardness of the pipe body is 86A-96A, and the shore hardness of the inner lining layer is 60D-80D.

Optionally, the inner liner layer has a mesh structure.

Optionally, the inner lining layer is a pipe network structure, and the pipe network structure is attached to the cavity wall of the inner cavity of the pipe body.

Optionally, the inner lining layer includes at least one spring structure, the spring structure is arranged coaxially with the tube body, and the outer surface of the spring structure is connected with the cavity wall of the inner cavity of the tube body.

Optionally, the inner lining layer and the pipe body are connected by heat shrinkage.

Optionally, the inner liner layer is a metal layer.

Optionally, the material of the metal layer includes one of stainless steel, nickel-titanium alloy, nickel alloy, and titanium alloy.

Optionally, the main catheter has a relatively proximal end and a distal end, the medical catheter further includes a manifold and a balloon, the manifold is arranged on the main catheter near the proximal end, and the The balloon is sleeved on the main catheter near the distal end, and the balloon is in communication with the manifold.

Optionally, a suction hole is opened on the main catheter, and the suction hole is provided at the distal end of the main catheter.

Optionally, the medical catheter is a digestive tract catheter.

In order to achieve the above objective, the present invention also provides a medical system, which includes a guide wire and the medical catheter as described in any one of the preceding items, and the guide wire is used to pass through the inner cavity of the tube body.

Optionally, the main catheter has opposite proximal and distal ends, a manifold is provided at a location close to the proximal end of the main catheter, and a balloon is sleeved at a location close to the distal end of the main catheter , The balloon is in communication with the manifold; the medical system further includes a balloon valve and a suction device, the balloon valve is used to connect with the manifold, and the suction device is used to connect with the The proximal end of the main catheter is connected.

Optionally, the proximal end of the tube body is provided with an air hole penetrating in the axial direction thereof, and the air hole is used to communicate the balloon and the manifold

Compared with the prior art, the medical catheter and medical system of the present invention have the following advantages:

The aforementioned medical catheter includes a main catheter with an inner cavity penetrating along its axial direction, and an inner lining layer is provided on the cavity wall of the inner cavity. In the process of pushing the medical catheter into the patient's body along the natural cavity of the human body, the inner lining layer supports the main catheter, avoids bending of the medical catheter, and improves the pushing of the medical catheter Sexuality and controllability, while reducing patient discomfort.

Description of the drawings

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

Figure 2 is an axial cross-sectional view of a medical catheter provided according to an embodiment of the present invention, in which the inner lining layer is a mesh structure;

3 is an axial cross-sectional view of a medical catheter provided according to an embodiment of the present invention, in which the inner lining layer includes a spring structure;

Fig. 4 is an A-A cross-sectional view of the medical catheter shown in Fig. 1.

[Description of reference signs is as follows]:

100-Medical catheter;

110-Main duct;

111-tube body, 112-inner lining, 113-second suction hole, 114-air hole;

120-manifold;

130-Balloon;

200-balloon valve.

Detailed ways

In order to make the purpose, advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings all adopt a very simplified form and all use imprecise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural items unless the content clearly indicates otherwise. As used in this specification, the term "or" is usually used to include the meaning of "and/or", unless the content clearly indicates otherwise, and the terms "installed", "connected", and "connected" shall be used. In a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, and it can be a communication between two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations. The same or similar reference signs in the drawings represent the same or similar components.

In this context, the terms "proximal" and "distal" refer to the relative orientation, relative position, and direction of elements or actions relative to each other from the perspective of the operator using the medical device, although the "proximal" and "distal" "End" is not restrictive, but "proximal" usually refers to the end of the medical device that is close to the operator during normal operation, and "distal" usually refers to the end that first enters the patient's body.

The object of the present invention is to provide a medical catheter, which can be introduced into a predetermined position in the patient's body along the natural cavity of the human body, so as to treat diseases. The medical catheter may be a digestive tract catheter, and the predetermined position may be, for example, a position of intestinal obstruction, so that the medical catheter can be used to treat intestinal obstruction, that is, the medical catheter may be an intestinal obstruction catheter. For ease of description, the following is an example of the medical catheter being an intestinal obstruction catheter.

1 and 2, the medical catheter 100 includes a main catheter 110, the main catheter 110 includes a tube body 111, the tube body 111 has an inner cavity penetrating along its axial direction, and the cavity wall of the inner cavity An inner lining layer 112 is provided thereon, and the hardness of the inner lining layer 112 is greater than the hardness of the pipe body 111. Optionally, the Shore hardness of the tube body 111 may be between 86A-96A, such as 86A, 87A, 89A, 90A, 91A, 93A, 94A, 95A, 96A. The Shore hardness of the inner liner 112 may be between 60D and 80D, such as 60D, 63D, 68D, 70D, 75D, 77D, 80D, and so on.

When the medical catheter is introduced into the patient's body, the tube body 111 is in contact with human tissues, and the inner liner 112 provides a supporting force to the tube body 111, so that the main catheter 110 is in the human body, such as the intestinal tract. It is not easy to bend when walking, thereby improving the pushability and controllability of the main catheter 110, shortening the catheterization time, and reducing the discomfort of the patient. During the indwelling of the catheter in the patient's body, the inner lining layer 112 continuously supports the tube body 111, so the main catheter 110 of the curved section of the small intestine will not bend and cause blockage, ensuring the therapeutic effect. The inner liner 112 extends along the axial direction of the tube body 111, and preferably the proximal end of the inner liner 112 is flush with the proximal end of the tube body 111, and the distal end of the inner liner 112 is flush with the proximal end of the tube body 111. The distal end of the tube body 111 is flush.

In this embodiment, the lining layer 112 is attached to the cavity wall of the inner cavity of the tube body 111. The number of layers of the inner liner layer 112 can be set as required, for example, one layer, two layers, or even more layers. Generally, the outer diameter of the main duct 110 is 5 mm-6 mm, and after the lining layer 112 is provided, the inner diameter of the main duct 110 is 3 mm-4 mm.

As shown in FIG. 2, in an exemplary embodiment, the inner lining layer 112 has a mesh structure, and further, for example, a pipe mesh structure. The pipe network structure may be formed by braiding of braided wire or cut and formed by a metal tube, and then the pipe network structure can be attached to the cavity wall of the inner cavity of the pipe body 111. In another exemplary embodiment, the inner liner 112 includes at least one spring structure (for example, as shown in FIG. 3), the spring structure is coaxially arranged with the tube body 111, and the spring structure The outer surface of is connected with the cavity wall of the inner cavity of the tube body 111. According to the length of each spring structure, the inner liner 112 may be formed by splicing a plurality of spring structures arranged along the axial direction of the tube body 111.

In this embodiment, the inner seed layer 112 and the tube body 111 may be connected by heat shrinking. Specifically, the pipe body 111 and the inner lining layer 112 are formed separately, and then the inner lining layer 112 is sleeved on a metal pipe, and then the pipe body 111 is sleeved on the inner lining layer 112. On the outer surface of the lining layer 112, a heat-shrinkable tube is then sheathed on the outer surface of the tube body 111, and then the heat-shrinkable tube is heated, so that the tube body 111 and the inner lining layer 112 are in the heat Connect under the action, and finally remove the heat shrinkable tube and the metal tube. Connecting the inner lining layer 112 and the pipe body 111 in a heat-shrinking manner can enhance the bending resistance of the main duct 110.

In this embodiment, the tube body 111 is composed of a hydrophilic polymer material. Specifically, the materials used to manufacture the tube body 111 include polyurethane, silica gel, silicone rubber, rubber, polyvinyl chloride, and polyamide. Any kind. Other hydrophilic polymer materials that meet the aforementioned hardness requirements can also be used. The lining layer 112 may be a metal lining layer or a non-metal lining layer. The inner liner layer 112 can be made of metal materials including but not limited to any one of stainless steel, nickel-titanium alloy, nickel alloy, and titanium alloy. The non-metallic materials that can be used to manufacture the inner liner layer 112 include, but are not limited to, any one of polyethylene, polypropylene or other polyolefin materials, polycarbonate, polyamide, polyoxymethylene, and ABS resin. In addition, the material used to manufacture the inner lining layer 112 should have good smoothness, so as to facilitate the introduction of the main catheter 110 into the patient's body using a guide wire.

Please continue to refer to FIG. 1, the medical catheter 100 further includes a manifold 120 and a balloon 130. The manifold 120 is disposed at a position close to the proximal end of the main catheter 110 and is used to connect a balloon valve. The balloon 130 is sleeved at a position close to the distal end of the main catheter 110, and the diameter of the balloon 130 is between 30 mm and 40 mm, and the length is between 4 cm and 5 cm. The balloon 130 communicates with the manifold 120.

In addition, the distal end of the main catheter 110 is also provided with a suction hole, the suction hole includes a first suction hole (not shown in the figure) and a second suction hole 113, the first suction hole is provided On the end surface of the distal end, the second suction hole 113 is provided on the side wall of the main duct 110. It can be understood that the inner liner 112 should not block the second suction hole 113.

The following describes the process of using the medical catheter to treat intestinal obstruction.

First, the operator puts the main catheter 110 on the guide wire, and connects the manifold 120 to the balloon valve 200 such as a syringe, and connects the proximal end of the main catheter 110 to a suction device ( (Not shown in the figure), for example, a medical air pump and a negative pressure device are connected, as shown in Figure 1.

After that, the operator pushes the main catheter 110 to a predetermined position in the patient's body along the guide wire under the supervision of the X-ray device. In this process, the balloon valve 200 is used to inflate the balloon 130 to inflate the balloon 130. The inflation of the balloon 130 can be used to open the adhered intestinal tract, thereby making the main catheter 110 can go to the predetermined position. At the same time, the suction device generates negative pressure to suck the intestinal contents from the first suction hole and the second suction hole 113 to the main duct 110, and then from the main duct. The proximal end of 110 is excreted from the body.

After the main catheter 110 is delivered to the predetermined position in the patient's body, the main catheter 110 is left in the patient's body for a period of time according to the actual situation of the patient. During the indwelling period of the main catheter 110, the operator uses the suction device to suck the intestinal contents to expel the body.

Further, an embodiment of the present invention also provides a medical system, the treatment device includes a guide wire (not shown in the figure) and the aforementioned medical catheter 100, the guide wire is threaded through the tube body 111 in the cavity.

The main catheter 110 of the medical catheter 100 has opposite proximal and distal ends. The medical catheter 100 further includes a manifold 120 and a balloon 130. The manifold 120 is disposed on the main catheter 110 near the proximal end. The balloon 130 is arranged at a position near the distal end of the main catheter 110, and the balloon 130 is in communication with the manifold 120. The treatment device also includes a balloon valve 200 and a suction device (not shown in the figure). The balloon valve 200 is connected to the manifold 120 for inflating the balloon 130. The suction device is connected to the proximal end of the main duct 110 and is used to generate negative pressure to suck intestinal contents.

Optionally, the proximal end of the tube body 111 is provided with an air hole 114 (as shown in FIG. 4) penetrating in the axial direction of the tube body 111, and the air hole 114 is used to communicate the balloon 130 and the Manifold 120. In this embodiment, the tube body 111 is provided with one air hole 114. In fact, the number of the air holes 114 can be set as required, for example, two, three or more.

The medical catheter provided by the embodiment of the present invention can be introduced into the patient's body along the natural cavity of the human body, because the main catheter of the medical catheter shown includes a tube body and an inner lining layer arranged on the cavity wall of the inner cavity of the shown tube body, and The hardness of the inner lining layer is greater than the hardness of the tube body, so the inner lining layer can provide supporting force to the tube body, so that the main catheter will not bend when traveling in the natural cavity of the human body. It is difficult to push, and when the main catheter reaches a predetermined position in the patient's body and stays in the body, the main catheter will not bend and cause the main catheter to be blocked. That is, the medical catheter has good pushability and controllability, and at the same time has a better treatment effect than the existing catheter.

Although the present invention is disclosed as above, it is not limited to this. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

A medical catheter, which is characterized by comprising a main catheter, the main catheter including a tube body, the tube body has an inner cavity penetrating along its axial direction, and at least one layer of lining is arranged on the cavity wall of the inner cavity The hardness of the inner lining layer is greater than the hardness of the pipe body.
The medical catheter according to claim 1, wherein the inner liner extends along the axial direction of the tube body, and the distal end of the inner liner is flush with the distal end of the tube body, so The proximal end of the inner lining layer is flush with the proximal end of the tube body.
The medical catheter according to claim 1, wherein the Shore hardness of the tube body is 86A-96A, and the Shore hardness of the inner lining layer is 60D-80D.
The medical catheter according to claim 1, wherein the inner lining layer has a mesh structure.
The medical catheter according to claim 4, wherein the inner lining layer is a pipe network structure, and the pipe network structure is attached to the lumen wall of the inner cavity of the pipe body.
The medical catheter according to claim 1, wherein the inner lining layer comprises at least one spring structure, the spring structure is arranged coaxially with the tube body, and the outer surface of the spring structure is connected to the tube body. The cavity wall of the inner cavity of the body is connected.
The medical catheter according to claim 3 or 4, wherein the inner lining layer and the tube body are connected by heat shrinkage.
The medical catheter according to claim 1, wherein the inner lining layer is a metal layer.
The medical catheter according to claim 8, wherein the material of the metal layer includes one of stainless steel, nickel titanium alloy, nickel alloy, and titanium alloy.
The medical catheter according to claim 1, wherein the main catheter has opposite proximal and distal ends, the medical catheter further comprises a manifold and a balloon, and the manifold is arranged near the main catheter. In the position of the proximal end, the balloon is sleeved on a position of the main catheter close to the distal end, and the balloon is in communication with the manifold.
The medical catheter according to claim 10, wherein the main catheter is provided with a suction hole, and the suction hole is provided at the distal end of the main catheter.
The medical catheter according to claim 1, wherein the medical catheter is a digestive duct catheter.
A medical system, which is characterized by comprising a guide wire and the medical catheter according to any one of claims 1-12, and the guide wire is used to pass through the inner cavity of the tube body.
The medical system according to claim 13, wherein the main catheter has opposite proximal and distal ends, a manifold is provided at a position close to the proximal end of the main catheter, and the main catheter is close to the A balloon is sleeved on the distal position, and the balloon is in communication with the manifold; the medical system further includes a balloon valve and a suction device, and the balloon valve is used to connect with the manifold, The suction device is used to connect with the proximal end of the main catheter.
The medical system according to claim 14, wherein the proximal end of the tube body is provided with an air hole penetrating in the axial direction thereof, and the air hole is used to communicate the balloon and the manifold.