CN219022991U

CN219022991U - Support catheter for ventricular assist device and cardiac assist device

Info

Publication number: CN219022991U
Application number: CN202222294015.6U
Authority: CN
Inventors: 叶文雄; 杨云骢; 刘曦; 杨夏燕; 虞奇峰
Original assignee: Shanghai Huanqing Medical Technology Co ltd
Current assignee: Shanghai Huanqing Medical Technology Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2023-05-16
Anticipated expiration: 2032-08-30

Abstract

The utility model discloses a support catheter for a ventricular assist device and a heart assist device, wherein the support catheter for the ventricular assist device comprises a catheter body, and the catheter body is a hollow catheter; the catheter body comprises a straight tube section at the proximal end and a spiral section at the distal end; the spiral section of the catheter body is spiral in a natural state and can be straightened under the action of external force. The bending part of the catheter body is arranged in a spiral shape, and the spiral section has a good mechanical energy storage function when in deformation, so that the support property of the distal end of the catheter body is enhanced, and the influence of flow channel blockage caused by the adhesion of ventricular auxiliary equipment to the ventricular wall after intervention is prevented; after the axial direction of the spiral section deforms under the action of external force, the spiral section at the far end is deformed preferentially, and the spiral section can rebound to the original state rapidly after the external force is removed; the spiral section part can be formed by one-step extrusion molding without any secondary splicing process, so that the production efficiency is improved.

Description

Support catheter for ventricular assist device and cardiac assist device

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a support catheter for a ventricular assist device and a heart assist device.

Background

The percutaneous ventricular assist device is an updated medical instrument for the traditional ventricular assist device or the heart blood pump, and has the main advantages that the percutaneous ventricular assist device is implanted without an open chest operation, and the percutaneous ventricular assist device can be implanted into the heart in a minimally invasive mode such as femoral artery puncture or incision, so that the operation risk is greatly reduced. This advantage makes it possible to use it for maintaining vital signs of patients with severe heart failure or for assisting in surgery in high risk PCI (percutaneous coronary intervention ) procedures, reducing the risk of the procedure. However, during operation of the percutaneous ventricular assist device, the distal end is disposed in the left ventricle after transvalvular, the proximal end is disposed in the aorta, and the proximal end is gradually shifted in position with time after operation, so as to avoid damage to the ventricular wall during operation and implantation, and a pigtail is used as the distal end of the device. In order to prevent the inflow chamber from being attached to the ventricular wall during the operation of the apparatus and affecting the product performance, the pigtail is required to have good support; after implantation and withdrawal of the guide wire, the pigtail should rebound rapidly to avoid scratching the ventricular wall, so good resilience of the pigtail is required. As shown in fig. 1, the conventional pigtail 10' is generally made of thermoplastic polyurethane, so that it is difficult to achieve both support and rebound resilience; if the pigtail is formed by mixing a plurality of materials or splicing two materials, the processing time and the labor cost can be greatly improved although the supportability and the rebound resilience are considered.

In view of this, there is an urgent need for improvements to the pigtail of the existing ventricular assist device that provide good support and good rebound resilience.

Disclosure of Invention

The utility model discloses a support catheter for a ventricular assist device and a heart assist device, which are used for solving the problem that a pigtail of the ventricular assist device cannot have both support and rebound resilience in the prior art.

In order to solve the problems, the utility model adopts the following technical scheme:

there is provided a support catheter for a ventricular assist device, comprising:

the catheter body is a hollow catheter; the catheter body comprises a straight tube section at the proximal end and a spiral section at the distal end; the spiral section of the catheter body is spiral in a natural state and can be straightened under the action of external force.

In the above scheme, the catheter further comprises a ball head connected to the distal end of the spiral section of the catheter body.

In the above scheme, the inner diameter dimension of the catheter body is consistent, and the outer diameter dimension is consistent.

In the above scheme, the sizes of the respective spirals of the spiral segment are the same.

In the above scheme, the ball head is located in the spiral line direction of the distal end of the spiral section.

In the above scheme, the pitches of the spiral sections are the same.

In the above scheme, the spiral size of at least part of the sections of each spiral from the proximal end to the distal end is decreased by 4% -30%.

In the above scheme, the ball head is located in the axial direction of the straight pipe section.

In the above scheme, the pitch of the spiral section gradually decreases from the proximal end to the distal end.

In the above aspect, the distal end of the spiral section is a substantially closed plane, and the diameter of the bulb is greater than the outer diameter of the catheter body.

In the scheme, the outer diameter of the catheter body is 2-3 mm, and the inner diameter of the catheter body is 1-1.5 mm.

In the above aspect, the hardness of the catheter body is 55D to 65D.

In the above scheme, the catheter body is composed of two spiral structures.

The utility model also provides a heart assist device comprising the support catheter according to any one of the above schemes and a blood pump assembly arranged at the proximal end of the catheter body.

The technical scheme adopted by the utility model can achieve the following beneficial effects:

the bending part of the catheter body is spirally arranged, and the radial rigidity of the spiral section is high due to the good mechanical energy storage function when the spiral section is deformed, so that the support property of the distal end of the catheter body is enhanced, the catheter body is not easy to deform, and the ventricular assist device is prevented from being stuck to the ventricular wall after intervention, so that the performance is influenced by the blockage of a flow channel; after the axial direction of the spiral section deforms under the action of external force, the spiral section at the far end is deformed preferentially, and the spiral section can rebound to the original state rapidly after the external force is removed; the spiral section part can be formed by one-step extrusion molding without any secondary splicing process, so that the spiral section part is easier to have better surface quality and lower cost, and the production efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments are briefly described below to form a part of the present utility model, and the exemplary embodiments of the present utility model and the description thereof illustrate the present utility model and do not constitute undue limitations of the present utility model. In the drawings:

FIG. 1 is a schematic diagram of the overall structure of a prior art ventricular assist device;

fig. 2 is a schematic overall structure of a pigtail of the ventricular assist device according to embodiment 1 of the present utility model;

fig. 3 is a schematic overall structure of a pigtail of the ventricular assist device according to embodiment 2 of the present utility model;

fig. 4 is a schematic overall structure of a ventricular assist device according to embodiment 3 of the present utility model.

The method specifically comprises the following reference numerals:

pigtail-10' in the prior art; a catheter body-10; ball head-11; straight pipe section-12; spiral segment-13; a blood pump assembly-20.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to specific embodiments of the present utility model and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

As shown in fig. 2, the support catheter for a ventricular assist device provided by the present utility model includes:

the catheter body 10, the catheter body 10 is a hollow catheter; the catheter body 10 comprises a proximal straight tube section 12 and a distal spiral section 13; the spiral section 13 of the catheter body 10 is spiral in a natural state and can straighten under the action of external force.

The bending part of the catheter body 10 is arranged in a spiral shape, and the spiral section 13 has a good mechanical energy storage function in deformation, so that the whole radial rigidity is high, the support property of the distal end of the catheter body 10 is enhanced, the catheter body is not easy to deform, and the ventricular assist device is prevented from being stuck to the ventricular wall after intervention, so that the performance is influenced by the blockage of a flow channel; after the axial direction of the spiral section 13 is deformed under the action of external force, the spiral section at the far end is deformed preferentially, and the spiral section can rebound to the original state rapidly after the external force is removed; the spiral section 13 can be formed by one-step extrusion molding without any secondary splicing process, is easier to have better surface quality and lower cost, and improves production efficiency.

The present utility model provides a support catheter for a ventricular assist device, further comprising: a bulb 11 is connected to the distal end of a helical section 13 of the catheter body 10.

In this embodiment, the catheter body 10 preferably has uniform inner diameter dimensions and uniform outer diameter dimensions.

In this embodiment, the individual spirals of the spiral section 13 are preferably of the same size. The outer diameter of each helix is the same, so that the resilience and support of each helix on the helix 13 is the same, facilitating sizing of the helix 13 according to the required resilience and support.

The ball head 11 is located in the spiral direction at the distal end of the spiral section 13. The surface of the bulb 11 is sufficiently rounded for the distal end of the catheter body 10. In clinical surgery, instruments are required to be introduced into the human body through a guide wire in order to prevent the blood vessel from being scratched during the intervention or withdrawal, or the ventricular wall from being damaged during the intervention phase, or the valve from being damaged during the transvalvular process, and thus the bulb 11 is used as the distal end.

The pitch of the helical segments 13 is preferably the same in this embodiment. The rebound resilience and the support property of the spiral section 13 are ensured to be the same.

The catheter body 10 is preferably made of thermoplastic polyurethane, can be molded by one-shot extrusion molding, does not require any secondary splicing process, is easier to have better surface quality and lower cost, and improves production efficiency.

In this embodiment, the outer diameter of the spiral section 13 and the straight pipe section 12 is preferably 2 to 3mm, and the inner diameter is preferably 1 to 1.5mm.

In this embodiment, the hardness of the catheter body 10 is preferably 55D to 65D.

In this embodiment, the spiral section 13 is preferably formed by a two-turn spiral structure, and since one turn of the spiral section 13 does not play a role of radial rigidity, more than three turns of the spiral section 13 will make the catheter body 10 too long to be convenient for transportation, and thus the spiral section 13 is provided with two turns.

The using method of the heart auxiliary device provided by the utility model comprises the following steps:

when the heart auxiliary device is implanted into a human body, the spiral section 13 is changed into a straight pipe under the support of the guide wire and enters the human body along with the guide wire until the heart auxiliary device integrally enters a designated position; when the heart assist device is withdrawn from the body, the helical segment 13 springs back to the helical state after the guide wire is withdrawn.

Example 2

As shown in fig. 3, in the present embodiment, the respective spirals of the spiral segment 13 are tapered by 4% to 30% in size from the proximal end to the distal end at least in a partial section, unlike embodiment 1. The distal end of the helical segment 13 is thus more resilient than the proximal end and the proximal end of the helical segment 13 is more supportive than the distal end. Because the axial of screw section 13 warp the back under the exogenic action, take precedence and warp at the distal end screw section, withdraw external force and rebound to original state rapidly, consequently make the distal end of screw section 13 get into the human body more unobstructed to the supportability of proximal end is good, has avoided the inflow port to paste the wall, consequently can not influence axial-flow pump performance, has avoided the risk of runner jam.

In this embodiment, the ball 11 is preferably located on the extension of the axis of the straight tube section 12. The pitch of the helical segment 13 gradually decreases from the proximal end to the distal end, forming as close to a closed plane as possible at the distal end. Although the helical section 13 has a lower stiffness, it will change from a straight tube to a helical tube as the guide wire is withdrawn, with the possibility of being entangled in chordae. Therefore, the bulb 11 is arranged on the central axis, is far away from the maximum outer diameter of the spiral section 13, and the diameter of the bulb 11 is larger than the outer diameter of the catheter body 10, so that the tendon is difficult to wind in from the bulb 11, and the possibility of winding the tendon is greatly reduced.

Example 3

As shown in fig. 4, the present utility model also provides a heart assist device including the support catheter of embodiment 1 or embodiment 2 and a blood pump assembly 20 disposed at the proximal end of the catheter body 10. Blood flows into the inflow housing along the proximal end of the catheter body 10 and continues to flow along the proximal end of the heart assist device. Since the curved portion of the catheter body 10 is spiral, the spiral section 13 has a good mechanical energy storage function during deformation, and has high radial rigidity, so that the support property of the distal end of the catheter body 10 is enhanced, the catheter body is not easy to deform, and the ventricular assist device is prevented from being stuck to the ventricular wall after being inserted into a human body, thereby affecting the performance due to the blockage of a flow passage.

The bending part of the catheter body is arranged in a spiral shape, and the radial rigidity of the spiral section is high due to the good mechanical energy storage function when the spiral section is deformed, so that the support property of the distal end of the catheter body is enhanced, the catheter body is not easy to deform, and the influence of flow channel blockage caused by the adhesion of ventricular auxiliary equipment to the ventricular wall after intervention is prevented; after the axial direction of the spiral section deforms under the action of external force, the spiral section at the far end is deformed preferentially, and the spiral section can rebound to the original state rapidly after the external force is removed; the spiral section part can be formed by one-step extrusion molding without any secondary splicing process, so that the spiral section part is easier to have better surface quality and lower cost, and the production efficiency is improved.

The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.

Claims

1. A support catheter for a ventricular assist device, comprising:

2. The support catheter of claim 1, further comprising a bulb attached to a distal end of the catheter body spiral section.

3. The support catheter of claim 1, wherein the catheter body has a uniform inner diameter dimension and a uniform outer diameter dimension.

4. The support catheter of claim 2, wherein the dimensions of each spiral of the spiral segments are the same.

5. The support catheter of claim 4, wherein the bulb is positioned in a helical direction distal to the helical segment.

6. The support catheter of claim 4, wherein the pitch of the helical segments is the same.

7. The support catheter of claim 2, wherein each helix of the helical segment decreases in size from 4% to 30% from the proximal end to the distal end at least in part of the segment.

8. The support conduit of claim 7 wherein the bulb is located in the axial direction of the straight tube segment.

9. The support catheter of claim 7, wherein the pitch of the helical segment gradually decreases from the proximal end to the distal end.

10. The support catheter of claim 7, wherein the distal end of the helical segment is substantially a closed plane, and the diameter of the bulb is greater than the outer diameter of the catheter body.

11. The support catheter of any one of claims 1-10, wherein the catheter body has an outer diameter of 2-3 mm and an inner diameter of 1-1.5 mm.

12. The support catheter of any one of claims 1-10, wherein the catheter body has a hardness of 55 d-65 d.

13. The support catheter of any one of claims 1-10, wherein the catheter body is comprised of a two turn helical structure.

14. A heart assist device comprising the support catheter of any one of claims 1-13 and a blood pump assembly disposed at a proximal end of the catheter body.