CN113491817A

CN113491817A - Medical catheter and medical system

Info

Publication number: CN113491817A
Application number: CN202010270192.3A
Authority: CN
Inventors: 朱鑫建; 王雄伟; 黄基锐; 柳逸凡
Original assignee: Microport Urocare Shanghai Co Ltd
Current assignee: Microport Urocare Shanghai Co Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-10-12

Abstract

The invention relates to a medical catheter which comprises a catheter body in a hollow structure, wherein the catheter body comprises a first catheter body and a second catheter body, the first catheter body is provided with a first inner cavity which penetrates through the first catheter body along the axial direction of the first catheter body, the second catheter body is arranged in the first inner cavity, and the hardness of the second catheter body is greater than that of the first catheter body. When the catheter body is pushed to a preset position in a patient body, the second tube body supports the first tube body, so that the catheter body is prevented from being bent, and the pushing performance and controllability of the medical catheter are improved.

Description

Medical catheter and medical system

Technical Field

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

Background

Adhesive Intestinal Obstruction (Adhesive Intestinal Obstruction) refers to the failure of Intestinal contents to pass through the Intestinal tract smoothly due to intra-abdominal Intestinal adhesion caused by various reasons. When intestinal contents are obstructed, a series of symptoms such as abdominal distension, abdominal pain, nausea, vomiting and defecation disorder occur. The middle part of the adhesive ileus is small ileus, and the previous investigation and statistics show that the small ileus accounts for about 40 percent of the ileus.

At present, the non-operative treatment process for small intestinal obstruction is mainly characterized by that a catheter is inserted into the stomach of a patient from nasal cavity, the position of the patient is regulated, the catheter can be passed through the large bend of stomach, then fed into the small intestine indwelling position, and then the catheter can be carried to the obstruction position by means of peristalsis of small intestine. During the passage of the catheter from the indwelling site to the obstructive site, suction is applied with a suction device to expel the intestinal contents from the catheter. During this treatment, the catheter needs to be left in the patient for 3-14 days, which is longer for patients with weak peristalsis. The existing catheter for treating intestinal obstruction is soft in texture, and is easy to bend in the process of pushing the catheter to the obstruction part and when the catheter is kept in a patient body, so that the problems of poor controllability and pushing performance and inconvenient operation exist.

Disclosure of Invention

The invention aims to provide a medical catheter and a medical system, wherein the medical catheter is not easy to bend in the process of introducing the medical catheter into a patient body, and has good controllability and pushing performance.

In order to achieve the above object, the present invention provides a medical catheter, which includes a catheter body having a hollow structure, wherein the catheter body includes a first tube and a second tube, the first tube has a first inner cavity penetrating along an axial direction of the first tube, the second tube is disposed in the first inner cavity, and a hardness of the second tube is greater than a hardness of the first tube.

Optionally, the shore hardness of the first pipe body is 50A-98A, and the shore hardness of the second pipe body is 62D-83D. Optionally, the second tube is detachably disposed in the first inner cavity.

Optionally, the first tube has opposite first and first proximal ends and the second tube has opposite second and second distal ends, the second distal end being disposed in the first lumen, the second proximal end passing out of the first lumen from the first proximal end.

Optionally, the positioning structure is further included, and the positioning structure is configured to constrain a relative position between the second tube and the first tube, so as to prevent the second distal end of the second tube from passing through the first inner cavity from the first distal end of the first tube.

Optionally, a step formed by extending the cavity wall of the first inner cavity to the first inner cavity along the radial direction of the first tube body is formed on the cavity wall of the first inner cavity, and the step abuts against the second distal end of the second tube body to form the limiting structure.

Optionally, a protruding portion protruding outward in the radial direction of the second tube body is formed on the second proximal end of the second tube body, and the protruding portion abuts against the first proximal end of the first tube body to form the limiting structure.

Optionally, a portion of the lumen wall of the first lumen near the first distal end is formed as a tapered surface for limiting movement of the second tube in the first lumen toward the first distal end to form the stop structure.

Optionally, the second distal end of the second tube is formed into a tapered structure, and an outer diameter of the tapered structure matches an inner diameter of the first lumen at the stop structure.

Optionally, the second distal end of the second tube is formed into a tapered structure, and a maximum outer diameter of the tapered structure is greater than a minimum inner diameter of the first lumen at the stop structure, and a minimum outer diameter of the tapered structure is less than the inner diameter of the first lumen at the stop structure.

Optionally, the second distal end of the second tube is spaced from the first distal end of the first tube by a distance of 20% to 75% of the length of the catheter body.

Optionally, the material for manufacturing the first tube body includes any one of polyurethane, silicone rubber, silicon rubber, polyvinyl chloride, and polyamide; and/or the presence of a gas in the gas,

the material for manufacturing the second pipe body comprises any one of polyethylene, polypropylene or other polyolefin materials, polycarbonate, polyamide, polyformaldehyde and ABS resin.

Optionally, the first tube has a first proximal end and a first distal end opposite to each other, the medical catheter further includes a manifold and a balloon, the manifold is disposed on the first tube at a position close to the first proximal end, the balloon is sleeved on the first tube at a position close to the first distal end, and the balloon is communicated with the manifold.

Optionally, a suction hole is formed in the first tube, and the suction hole is located on one side of the balloon close to the first proximal end.

Optionally, the outer diameter of the first pipe body is 5mm to 6mm, and the outer diameter of the second pipe body is 3mm to 4mm

Optionally, the medical catheter is a digestive tract catheter.

In order to achieve the above object, the present invention further provides a medical system, including a guide wire and the medical catheter as claimed in any one of the preceding claims, wherein the second tube has a second inner cavity penetrating along an axial direction thereof, and the guide wire is inserted into the second inner cavity.

Compared with the prior art, the medical catheter and the treatment device have the following advantages:

first, aforementioned medical catheter is including being hollow structure's pipe body, the pipe body includes first body and second body, first body has along its axial first inner chamber that extends with running through, the second body sets up in the first inner chamber, and the hardness of second body is greater than the hardness of first body. Namely, the catheter body is set to be of a double-layer structure, and the hardness of the inner-layer structure is greater than that of the outer-layer structure, so that when the catheter body is guided into a patient, the first tube body is in contact with human tissue, damage to the human tissue is reduced, the second tube body supports the first tube body, bending of the catheter body is avoided, and controllability and pushing performance of the catheter body are improved. In addition, the medical catheter can reduce the time for the catheter body to be kept in the body of a patient with weakened peristalsis, and can still be smoothly conveyed into the body of the patient with lost peristalsis so as to treat intestinal obstruction.

The second tube body and the second tube body are detachably arranged in the first tube body, and after the catheter body is conveyed to a preset position in a patient body, the second tube body can be detached from the first tube body and withdrawn out of the patient body, so that only the first tube body is detained in the patient body, and discomfort of the patient is reduced.

Drawings

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

FIG. 2 is a radial cross-sectional view of a medical catheter provided in accordance with an embodiment of the present invention;

FIG. 3 is a partial axial cross-sectional view of a medical catheter in accordance with an embodiment of the present invention, showing a retention feature as a retention step disposed on a wall of a first lumen;

FIG. 4 is a schematic view of the first tube and the second tube of the medical catheter of the present invention, illustrating the stop structure as a protrusion disposed at the second distal end;

FIG. 5 is a schematic view of the first and second tubes of the medical catheter of the present invention, illustrating the limiting structure as a tapered surface formed on the wall of the first lumen, and the second proximal end being free of the tapered structure, according to one embodiment of the present invention;

FIG. 6 is a schematic view of the first and second tubes of the medical catheter in accordance with one embodiment of the present invention, showing the limiting structure as a tapered surface formed on the wall of the first lumen and the second proximal end as a tapered structure matching the tapered surface;

fig. 7 is a schematic view of the first tube and the second tube of the medical catheter of the present invention, illustrating the limiting structure as a tapered surface formed on the wall of the first lumen, and the second proximal end as a tapered structure not matching with the tapered surface.

[ reference numerals are described below ]:

100-a catheter body;

110-a first tube, 111-a second suction hole, 120-a second tube, 130-a limiting structure, 140-a manifold, 150-a balloon;

200-balloon valve.

Detailed Description

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

As used in this specification, the singular forms "a," "an," and "the" include plural 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, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The same or similar reference numbers in the drawings identify the same or similar elements.

Herein, the terms "proximal" and "distal" are relative orientations, relative positions, directions of elements or actions with respect to each other from the perspective of an operator using the medical device, although "proximal" and "distal" are not limiting, but "proximal" generally refers to the end of the medical device that is closer to the operator during normal operation, and "distal" generally refers to the end that is first introduced into the patient.

The present invention is directed to a medical catheter, which can be introduced into a predetermined position in a patient along a natural lumen of a human body, in this embodiment, the medical catheter can be a gastrointestinal catheter, and the predetermined position can be, for example, a position of ileus, so that the medical catheter can be used for treating ileus. Referring to fig. 1 and 2, the medical catheter includes a catheter body 100 having a hollow structure, the catheter body 100 includes a first tube 110 and a second tube 120, the first tube 110 has a first inner cavity penetrating along an axial direction thereof, the second tube 120 is disposed in the first inner cavity, and a hardness of the second tube 120 is greater than a hardness of the first tube 110. Alternatively, the first tube 110 may have a durometer between 50A-98A, such as 51A, 55A, 60A, 65A, 70A, 76A, 80A, 90A, 98A. The hardness of the second tube 120 may be between 62D-83D, such as 62D, 65D, 68D, 70D, 72D, 75D, 80D, 83D, etc.

That is, in the medical catheter according to the embodiment of the present invention, the first tube 110 disposed at the outer layer is soft, and when the catheter body 100 is introduced into the body of the patient, the first tube 110 contacts the body tissue, so that damage to the body tissue can be effectively reduced, and discomfort of the patient can be reduced. The second tube 120 with relatively hard texture is disposed in the inner layer, and can support the first tube 110, so that the catheter body 100 is not easily bent when passing through a human body, such as an intestinal tract, and has good controllability and pushability. Particularly, the medical catheter is used for treating intestinal obstruction, for a patient with reduced intestinal peristalsis, the indwelling time of the catheter body 100 of the medical catheter provided by the embodiment of the invention in the patient body is shorter than that of a traditional catheter, and for a patient with lost intestinal peristalsis, an operator can still send the catheter body 100 to the obstruction part by utilizing the support performance of the second tube 120 on the first tube 110 to treat intestinal obstruction.

Optionally, the outer diameter of the first tube 110 is 5mm to 6mm, and the outer diameter of the second tube 120 is 3mm to 4 mm. The material for manufacturing the first tube 110 includes, but is not limited to, any one of polyurethane, silicone, silicon rubber, polyvinyl chloride, and polyamide. The first tube 110 has opposite first proximal and distal ends, the first proximal end being an open end. The material for manufacturing the second tube 120 includes, but is not limited to, any one of polyethylene, polypropylene or other polyolefin group materials, polycarbonate, polyamide, polyoxymethylene, and ABS resin. Further, the second tube 120 has a second proximal end and a second distal end opposite to each other, and the second distal end is disposed in the first inner cavity. The second tube 120 has a second lumen extending therethrough in the axial direction thereof. When the second tube 120 is disposed in the first inner cavity, the first inner cavity is communicated with the second inner cavity, and the second inner cavity can be used for a guide wire to penetrate through. The guidewire is used to guide the catheter body 100 into a predetermined location within a patient.

Further, the second tube 120 is detachably disposed in the first inner cavity, and when the catheter body 100 reaches a predetermined position in the patient, the operator can withdraw the second tube 120 from the first proximal end, so that only the first tube 110 is left in the patient, and discomfort of the patient is further reduced. Thus, in this embodiment, the second proximal end of the second tube 120 extends out of the first lumen from the first proximal end of the first tube 110 to facilitate the withdrawal of the second tube 120, and generally the second proximal end only needs to slightly protrude from the first proximal end.

Generally, the medical catheter can be used as long as the second distal end of the second tube 120 remains in the first lumen. However, in this embodiment, it is preferable that the first distal end of the first tube 110 is spaced apart from the second distal end of the second tube 120 by a distance which may be 20% to 75% of the axial length of the catheter body 100, such as 20%, 35%, 40%, 45%, 55%, 60%, 70%, 75%, etc. That is, the catheter body 100 is divided into two portions, wherein the portion near the first distal end is a single-layer structure, and the portion near the first proximal end is a double-layer structure.

Further, the catheter body 100 further comprises a limiting structure 130, wherein the limiting structure 130 is configured to limit a relative position between the first tube 110 and the second tube 120, so as to prevent the second tube 120 from moving in the first lumen toward the first distal end of the first tube 110 and causing the second distal end to pass through the first lumen. The limiting structure 130 can have various forms according to practical situations.

Referring to fig. 3, in some embodiments, the position-limiting structure 130 is disposed on the second tube 120, for example, a protrusion extending outward along the radial direction of the second tube 120 is disposed on the second proximal end of the second tube 120, and the protrusion abuts against the first proximal end of the first tube 110, so that the second tube 120 cannot move further to the first distal end. In this embodiment, the protrusion may surround the second tube 120 in a circumferential direction, and may also include a plurality of sub-protrusions arranged at intervals.

In other embodiments, the limiting structure may be disposed on the wall of the first inner cavity, for example, referring to fig. 4, the limiting structure 130 is a step disposed on the wall of the first inner cavity and extending toward the first inner cavity along the radial direction of the first tube 110, and the step abuts against the second distal end of the second tube 120, so as to prevent the second tube 120 from moving toward the first distal end along the axial direction of the first inner cavity. Alternatively, in the embodiment shown in fig. 5, the position-limiting structure 130 is a tapered surface formed on the wall of the first inner cavity, and the tapered surface is configured to gradually decrease the cross-sectional area of the inner cavity in the direction from the first proximal end to the first distal end, so that the second distal end of the second tube 120 can abut against the tapered surface, so that the second tube 120 cannot move further to the first distal end. When the tapered surface is adopted as the limiting structure 130, the second distal end may also be set to be a tapered structure, please refer to fig. 6 and 7, in the embodiment shown in fig. 6, the second distal end is formed to be a tapered structure, and the outer diameter of the tapered structure matches with the inner diameter of the first inner cavity at the limiting structure 130, while in the embodiment shown in fig. 7, the maximum outer diameter of the tapered structure formed by the second distal end is larger than the minimum outer diameter of the first inner cavity at the limiting structure 130, and the minimum outer diameter of the tapered structure is smaller than the inner diameter of the first inner cavity at the limiting structure 130, that is, in the embodiment shown in fig. 7, the outer diameter of the tapered structure formed by the second distal end does not match with the inner diameter of the first inner cavity at the limiting structure 130. In addition, when the position-limiting structure 130 is disposed on the wall of the first inner cavity, the specific position of the position-limiting structure 130 can be set as required, for example, the position-limiting structure 130 can be disposed at the end of the first distal end, or the distance from the position-limiting structure 130 to the end of the second distal end is in the range of 20% -75% of the axial length of the catheter body 100.

Further, the medical catheter further comprises a manifold 140 and a balloon 150, wherein the manifold 140 is disposed at the first tube 110 near the first proximal end and is used for connecting a balloon valve. The balloon 150 is sleeved on the first tube 110 near the first distal end, and more specifically, the balloon 150 is disposed on a side of the interface area near the first distal end, and the diameter of the balloon 150 is between 30mm and 40mm, and the length of the balloon 150 is between 4cm and 5 cm. The balloon 150 is in communication with the manifold 140.

In addition, the first tube 110 is further provided with a suction hole on a side of the balloon 150 near the first distal end, the suction hole includes a first suction hole (not shown) and a second suction hole 111, the first suction hole is provided on an end surface of the first distal end, and the second suction hole 111 is provided on a side wall of the first tube 110.

The procedure for treating ileus using the medical catheter is described below.

The catheter body 100 is first threaded over a guidewire and the manifold 140 is connected to a balloon valve, such as a syringe, and the first proximal end is connected to a suction device, such as a medical air pump, negative pressure device.

The catheter body 100 is then advanced along the guide wire under the supervision of an X-ray device to a predetermined location within the patient, during which a balloon valve inflates the balloon 150, causing it to expand, which inflation of the balloon 150 may serve to open up the adhered intestine, allowing the catheter body 100 to travel to the predetermined location. At the same time, the suction device generates negative pressure to suck intestinal contents from the first and second suction holes 111 into the catheter body 100 and discharge them out of the body.

After the catheter body 100 is delivered to the site, the second tube 120 is withdrawn from the first proximal end, leaving only the first tube 110 in the patient.

During the remaining time of the first tube 110, the intestinal contents are suctioned out of the body using the suction device.

Further, as shown in fig. 1, the present invention also provides a medical system, wherein the treatment device comprises a guide wire (not shown) and a medical catheter as described above, and the guide wire is arranged in the second inner cavity in a penetrating mode.

The first tube 110 of the medical catheter has a first proximal end and a first distal end opposite to each other, the medical catheter further comprises a manifold 140 and a balloon 150, the manifold 140 is disposed at a position of the first tube 110 near the first proximal end, the balloon 150 is disposed at a position of the first tube 110 near the first distal end, and the balloon 150 is communicated with the manifold 140. The treatment device further includes a balloon valve 200 connected to the manifold 140 for inflating the balloon 150, and a suction device (not shown) connected to the first proximal end of the first tube 110 for creating a negative pressure to aspirate intestinal contents.

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

1. The medical catheter is characterized by comprising a catheter body which is of a hollow structure, wherein the catheter body comprises a first catheter body and a second catheter body, the first catheter body is provided with a first inner cavity which is axially communicated along the first catheter body, the second catheter body is arranged in the first inner cavity, and the hardness of the second catheter body is greater than that of the first catheter body.

2. The medical catheter of claim 1, wherein the first tube body has a shore hardness of 50A-98A and the second tube body has a shore hardness of 62D-83D.

3. The medical catheter of claim 1, wherein the second tube is removably disposed in the first lumen.

4. A medical catheter as in claim 3, wherein the first tube has opposite first and first proximal ends and the second tube has opposite second and second distal ends, the second distal end being disposed within the first lumen, the second proximal end exiting the first lumen from the first proximal end.

5. The medical catheter of claim 4, further comprising a stop structure for constraining the relative position between the second tube and the first tube to prevent the second distal end of the second tube from passing out of the first lumen from the first distal end of the first tube.

6. The medical catheter as claimed in claim 5, wherein a step extending from the wall of the first inner cavity to the first inner cavity along the radial direction of the first tube is formed on the wall of the first inner cavity, and the step abuts against the second distal end of the second tube to form the limiting structure.

7. The medical catheter as claimed in claim 5, wherein the second proximal end of the second tube has a protrusion formed thereon and protruding outward in a radial direction of the second tube, the protrusion abutting against the first proximal end of the first tube to form the stopper structure.

8. The medical catheter as claimed in claim 5, wherein a portion of the lumen wall of the first lumen adjacent the first distal end is formed as a tapered surface for limiting movement of the second tube within the first lumen toward the first distal end to form the stop structure.

9. The medical catheter of claim 8, wherein the second distal end of the second tube is formed as a tapered structure having an outer diameter matching an inner diameter of the first lumen at the stop.

10. The medical catheter of claim 8, wherein the second distal end of the second tube is formed as a tapered structure having a maximum outer diameter greater than a minimum inner diameter of the first lumen at the stop and a minimum outer diameter less than an inner diameter of the first lumen at the stop.

11. The medical catheter of any one of claims 4-9, wherein the distance from the second distal end of the second tube to the first distal end of the first tube is 20% -75% of the length of the catheter body.

12. The medical catheter as claimed in claim 1 or 2, wherein the first tube is made of a material including any one of polyurethane, silicone rubber, polyvinyl chloride, and polyamide; and/or the presence of a gas in the gas,

13. The medical catheter of claim 1, wherein the first tube has opposite first proximal and distal ends, the medical catheter further comprising a manifold disposed on the first tube proximate the first proximal end and a balloon disposed on the first tube proximate the first distal end, the balloon being in communication with the manifold.

14. The medical catheter of claim 13, wherein the first tube defines a suction aperture, the suction aperture being positioned on a side of the balloon adjacent the first proximal end.

15. The medical catheter of claim 1, wherein the first tube has an outer diameter of 5mm to 6mm and the second tube has an outer diameter of 3mm to 4 mm.

16. The medical catheter of claim 1, wherein the medical catheter is an alimentary tract catheter.

17. A medical system comprising a medical catheter according to any one of claims 1 to 11 and a guide wire, said second tube having a second lumen extending therethrough in an axial direction, said guide wire being disposed through said second lumen.