CN215309536U

CN215309536U - Developing ring and conduit

Info

Publication number: CN215309536U
Application number: CN202121423526.2U
Authority: CN
Inventors: 王吉成; 孔令涛; 宋东辉; 张新波
Original assignee: Hemu China Biological Engineering Co ltd
Current assignee: Hemu China Biological Engineering Co ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2021-12-28
Anticipated expiration: 2031-06-25

Abstract

The utility model relates to the technical field of medical instruments, in particular to a developing ring and a catheter, the developing ring comprises a developing ring body, the developing ring body comprises a first connecting section and a second connecting section, the second connecting section is provided with a notch, the notch is inclined from the end surface of the near end of the second connecting section to the axis and extends to the end surface of the far end of the second connecting section along the axial direction, the end surface of the far end of the second connecting section is perpendicular to the axial line, the first connecting section and the second connecting section are provided with matched openings, the catheter comprises a catheter body, the far end of the catheter body is provided with the developing ring, the developing ring is fixedly connected with the catheter body, the catheter body is provided with an inner layer, a coil layer, a braided layer and an outer layer from inside to outside, the coil layer at least covers the far end and the middle section of the inner layer, and at least covers the near end and the middle section of the inner layer The blood vessel passing device has the advantages of fast blood vessel passing, good pushing performance, good torsion performance and good bending performance.

Description

Developing ring and conduit

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a developing ring and a catheter.

Background

Almost every placement or treatment of neurovascular devices occurs at or above the neck, and therefore catheters used in neurovascular systems must be able to traverse tortuous vessels, and in designing catheters for neurovascular applications, engineers must balance between functionality and structure and basically target trackability, flexibility, pushability and torque of catheters, ideally neurovascular catheters should have a minimum outer diameter to transport medical devices/implants through small vessels and a maximum inner diameter to transport the medical devices/implants, usually to locate the catheter, to place a visualization ring on the catheter, conventional visualization rings have annular closed ring structures, annular open ring structures, etc., generally in such a way that an integral annular visualization ring is placed around the outside of the catheter, distributed at the most distal end of the catheter near the orifice, and upon retrieval chinese patent CN210784317U discloses an intravascular pressure measurement catheter with visualization ring in order to facilitate the placement and treatment of the device, it is characterized by comprising: a distal cannula having a guidewire lumen slidably receiving a separate medical guidewire; a pressure sensor disposed at the front end of the distal cannula for measuring blood pressure within the blood vessel and generating a blood pressure signal; a developing ring disposed at a side close to the pressure sensor, and at least one end of the developing ring is formed by obliquely cutting an annular tube body in a direction forming an included angle with a length direction of the annular tube body; and a proximal portion coupled with the distal sleeve and including a signal path for transmitting the blood pressure signal from the pressure sensor, and a connecting conduit for supporting the signal path and moving the distal sleeve, wherein the pattern of the visualization ring is capable of indicating a radial position of the pressure sensor disposed on an outer circumference of the distal sleeve under X-rays, a deficiency of the above patent: firstly, the end face of the distal end of the developing ring in the patent is an inclined face, which causes that the distal end of the developing ring is in point contact with the blood vessel when passing through the blood vessel, the distal end of the developing ring easily stabs the blood vessel, and the blood vessel is thinner and rounder when the intracranial blood vessel of a human body is farther, which causes that the catheter in the patent easily stabs the inner wall of the blood vessel when passing through the intracranial blood vessel and even cannot pass through the intracranial blood vessel; secondly, the catheter in the prior art is usually composed of an outer polymer layer, a single metal braided or coiled spiral coil, an inner lining and the like, when the catheter passes through a complex tortuous blood vessel, the pushing property, the twisting property and the bending property of the catheter cannot be expected, so that the catheter cannot be conveyed to an expected target lesion part, and the application of the catheter is greatly limited.

Disclosure of Invention

The utility model aims to solve the defects of the prior art and provides the developing ring and the catheter which have the advantages of ingenious structure, no damage to blood vessels, quick blood vessel passing, good pushing property, good torsion property and good bending property.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

a development ring, includes development ring body, its characterized in that: the developing ring body comprises a first connecting section and a second connecting section, the first connecting section is annular, the near end of the second connecting section is fixedly connected with the first connecting section, an incision is formed in the second connecting section, the near end face of the second connecting section inclines to the axis center and extends to the far end face of the second connecting section along the axial direction, the far end face of the second connecting section is perpendicular to the axis, the far end face of the second connecting section is an arc-shaped face, and therefore when the developing ring penetrates through the inner wall of a blood vessel, the developing ring can not damage the blood vessel if contacting with the inner wall of the blood vessel, and meanwhile the developing ring can pass through the blood vessel fast and well.

According to the utility model, the first connecting section is provided with the first opening, the near end of the second connecting section is provided with the second opening, and the first opening and the second opening are matched to form the opening, so that the developing ring is convenient to mount and dismount.

A catheter, comprising a catheter body, characterized by: the distal end of pipe body is equipped with the aforesaid develop the ring, develop ring and pipe body fixed connection, the pipe body is equipped with inlayer, coil layer, weaving layer and skin from inside to outside, coil layer and inlayer fixed connection, weaving layer and coil layer and inlayer fixed connection, skin and weaving layer, coil layer and inlayer fixed connection to do benefit to and make the pipe body have good propelling movement nature, torsional properties and bending property.

The coil layer covers at least the distal end and the middle section of the inner layer, so that the pushing performance and the bending performance of the catheter body are improved, and the distal end of the catheter body can reach a treatment area more easily.

The braided layer at least covers the near end and the middle section of the inner layer, so that the twisting performance of the catheter body is improved, and the twisting of the near end can be well transmitted to the far end.

The utility model has the advantages of ingenious structure, no damage to blood vessels, quick blood vessel penetration, good pushing property, good torsion property, good bending property and the like due to the adoption of the structure.

Drawings

FIG. 1 is a schematic view of the structure of a development ring in the present invention.

FIG. 2 is a schematic representation of the outer diameter of a visualization ring through a blood vessel in the present invention versus the outer diameter of a visualization ring through a blood vessel in the prior art.

Fig. 3 is a schematic view of a catheter according to the present invention.

Fig. 4 is a schematic view of another catheter according to the present invention.

Fig. 5 is a schematic view of a structure of still another catheter in accordance with the present invention.

Fig. 6 is a schematic view of a structure of still another catheter in accordance with the present invention.

Reference numerals: development ring body 1, first linkage segment 2, second linkage segment 3, opening 4, pipe body 5, development ring 6, inlayer 7, coil layer 8, weaving layer 9, skin 10, incision 11, development ring 100 among the prior art.

Detailed Description

The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.

For purposes of more clearly describing the present invention, the terms "distal" and "proximal" are defined herein as terms commonly used in the art of interventional medical devices, and specifically, "distal" refers to the end of the surgical procedure distal from the operator and "proximal" refers to the end of the surgical procedure proximal to the operator.

A developing ring, comprising a developing ring body 1, characterized in that: development ring body 1 includes first linkage segment 2 and second linkage segment 3, first linkage segment 2 is cyclic annularly, the near-end and the 2 fixed connection of first linkage segment of second linkage segment 3, be equipped with incision 11 on the second linkage segment 3, incision 11 is by 3 near-end terminal surfaces of second linkage segment to the axle center slope and extend to 3 distal end terminal surfaces of second linkage segment along the axial, 3 distal end terminal surfaces perpendicular to axis of second linkage segment, and the distal end terminal surface of second linkage segment is the arcwall face, so when development ring passes the vascular inner wall, if development ring is the face contact with the contact of vascular inner wall, development ring can not hinder the blood vessel, can make the development ring pass through the blood vessel fast good again simultaneously.

According to the utility model, the first connecting section 2 is provided with a first opening, the near end of the second connecting section 3 is provided with a second opening, and the first opening and the second opening are matched to form the opening 4, so that the developing ring is convenient to mount and dismount.

As shown in the attached

drawings

1 and 2, the shortest ring edge of the developing ring 6 in the utility model is provided with an opening 4, the developing ring 6 is conveniently fixed on a catheter and is also conveniently taken down under the condition of not influencing the strength of the developing ring 6, the installation is convenient and quick, the second connecting section 3 is provided with a notch 11, the far end surface of the second connecting section 3 is an arc surface, so that the developing ring is in surface contact with the inner wall of a blood vessel, and the blood vessel is not punctured by the developing ring 6, as shown in the attached drawing 2, the outer diameter of the developing ring 6 passing through the blood vessel in the utility model is schematically illustrated with the outer diameter of the developing ring 100 passing through the blood vessel in the prior art, the longitudinal section of the developing ring 6 in the utility model is five-edge shape, the longitudinal section of the developing ring 100 in the prior art is in a ladder shape, the same inner diameter of the blood vessel can be seen, the utility model can pass through, the far end of the developing ring 100 in the prior art pokes the inner wall of the blood vessel, therefore, the utility model can not only not hurt the blood vessel, the developing ring 6 can pass through the blood vessel with smaller diameter, and has better in-place performance, convenient operation and safe use.

A catheter comprising a catheter body 5, characterized in that: the distal end of pipe body 5 is equipped with the aforesaid develop ring 6, develop

ring

6 and 5 fixed connection of pipe body, pipe body 5 is equipped with inlayer 7, coil layer 8, weaving layer 9 and skin 10 from inside to outside, coil layer 8 and inlayer 7 fixed connection, weaving layer 9 and coil layer 8 and inlayer 7 fixed connection, skin 10 and weaving layer 9, coil layer 8 and inlayer 7 fixed connection to do benefit to and make the pipe body have good propelling movement nature, torsional property and bending property.

The coil layer 8 of the present invention covers at least the distal and middle sections of the inner layer 7 to facilitate enhanced pushability and bendability of the catheter body, making it easier for the distal end of the catheter body to reach the treatment area.

The braided layer 9 at least covers the near end and the middle section of the inner layer 7, so that the twisting performance of the catheter body is improved, and the twisting of the near end can be well transmitted to the far end.

As shown in the attached drawings 3-6, four catheters with different structures are provided, in the utility model, a coil layer is wound on an inner layer and is fixedly connected with the inner layer, a braid layer is wound on the inner layer and/or the coil layer, the braid layer is fixedly connected with the inner layer and the coil layer, an outer layer is fixed on the inner layer, the coil layer and the braid layer and is fixedly connected with the inner layer, the coil layer is wound on the inner layer, a gap is reserved between adjacent coils, if the braid layer is attached on the coil layer, the braid layer can be fixedly connected with the inner layer in the gap between the adjacent coils, a gap is reserved on the corresponding braid layer, thus the outer layer can be fixedly connected with the coil layer or the inner layer in the gap between the braid layers, the connection mode is the same as that of the prior art and is not repeated, the inner layer can be a polytetrafluoroethylene thin-wall tube in the utility model, the materials of the coil layer and the braid layer can be stainless steel, cobalt-chromium alloy or nickel-titanium alloy, the outer layer can be a thermoplastic polyurethane elastomer rubber tube or a polyether block polyamide tube or a nylon tube,

FIG. 3 is a first catheter type numbered 1 in which the coil layer covers the distal end and the intermediate section of the inner layer, the braid layer covers the proximal end and the intermediate section of the inner layer, and the intermediate section of the braid layer partially overlaps the intermediate section of the coil layer;

FIG. 4 is a second catheter type, generally designated 2, having a coil layer overlying the distal, intermediate and proximal ends of the inner layer, a braid overlying the proximal and intermediate ends of the inner layer, and proximal and intermediate ends of the braid overlying the proximal and intermediate ends of the coil layer;

FIG. 5 is a third catheter numbered 3 having a coil layer covering the distal and intermediate sections of the inner layer, a braid covering the distal, intermediate and proximal ends of the inner layer, and a distal and intermediate section of the braid covering the distal and intermediate sections of the coil layer;

FIG. 6 is a fourth catheter numbered 4 with the coil layer covering the distal, intermediate and proximal ends of the inner layer and the braid layer covering the distal, intermediate and proximal ends of the coil layer; the performance tests were performed on the four catheters for their distal flexibility, pushability, torqueability and bendability, and the results were as follows:

the distal flexibility refers to the position of the catheter which needs to reach a target blood vessel through a tortuous blood vessel, and the distal end of the catheter is soft and can reach a far treatment area through the curved blood vessel; the pushing performance means that when the catheter is conveyed to the position of a target blood vessel in the operation process of a doctor, the catheter is easy to push in place and does not damage the blood vessel; the torsionality is that in order to enable the catheter to pass through tortuous vessels in the operation process of a doctor, the catheter needs to be twisted to a certain degree sometimes, and when the catheter is twisted at the proximal end, the proximal end needs to be transmitted to the distal end; the flexibility means that when the catheter is conveyed to a target blood vessel, the intracranial blood vessel is tortuous and meets the blood vessels with different curvatures, the catheter can smoothly pass through the blood vessels with different curvatures, and the catheter does not collapse when passing through the tortuous blood vessels; in the tests, the flexibility, the torsion property and the bending property of the far end are obtained by adopting the existing equipment for testing, the pushing property is obtained by judging after the doctor uses the catheter for multiple times, and the four catheters are easy to push without damaging blood vessels; with respect to distal compliance, the stiffness of the catheter decreases from the proximal end to the distal end, the compliance increases, and the compliance of the distal ends of the third catheter of fig. 5 and the fourth catheter of fig. 6 is superior to the compliance of the distal ends of the first catheter of fig. 3 and the second catheter of fig. 4; with respect to the torsion, the first catheter shown in fig. 3 and the second catheter shown in fig. 4 allow a doctor to observe that the distal end of the catheter starts to rotate when rotating the proximal end of the catheter by 180 degrees, and the third catheter shown in fig. 5 and the fourth catheter shown in fig. 6 allow the doctor to observe that the distal end of the catheter starts to rotate when rotating the proximal end of the catheter by 120 degrees, so that the catheter in the utility model has sensitive response and high response speed compared with the prior art that the proximal end of the catheter rotates by one or two circles and the distal end of the catheter starts to rotate; regarding the flexibility, the minimum bending radius of the distal ends of the first catheter shown in fig. 3 and the second catheter shown in fig. 4 is smaller than the minimum bending radius of the distal ends of the third catheter shown in fig. 5 and the fourth catheter shown in fig. 6, and the flexibility of the first catheter shown in fig. 3 and the second catheter shown in fig. 4 is more excellent, and the catheters can smoothly pass through blood vessels with different curvatures and do not collapse when passing through tortuous blood vessels.

Claims

1. A development ring, includes development ring body, its characterized in that: the developing ring body comprises a first connecting section and a second connecting section, the first connecting section is annular, the near end of the second connecting section is fixedly connected with the first connecting section, a notch is formed in the second connecting section, the notch is formed by inclining the near end face of the second connecting section to the axis center and extending to the far end face of the second connecting section along the axial direction, and the far end face of the second connecting section is perpendicular to the axis.

2. The developer ring of claim 1, wherein: the first connecting section is provided with a first opening, the near end of the second connecting section is provided with a second opening, and the first opening and the second opening are matched to form an opening.

3. A catheter, comprising a catheter body, characterized by: the distal end of the catheter body is provided with the developing ring as claimed in claim 1 or 2, the developing ring is fixedly connected with the catheter body, the catheter body is provided with an inner layer, a coil layer, a woven layer and an outer layer from inside to outside, the coil layer is fixedly connected with the inner layer, the woven layer is fixedly connected with the coil layer and the inner layer, and the outer layer is fixedly connected with the woven layer, the coil layer and the inner layer.

4. A catheter as claimed in claim 3, wherein: the coil layer covers at least the distal and intermediate sections of the inner layer.

5. A catheter as claimed in claim 3, wherein: the braided layer covers at least the proximal and intermediate sections of the inner layer.

6. A catheter as claimed in claim 4, wherein: the braided layer covers at least the proximal and intermediate sections of the inner layer.