CN217285930U

CN217285930U - Medical implant

Info

Publication number: CN217285930U
Application number: CN202220627770.9U
Authority: CN
Inventors: 余画; 蔡亮
Original assignee: Microport Neurotech Shanghai Co Ltd
Current assignee: Microport Neurotech Shanghai Co Ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-08-26
Anticipated expiration: 2032-03-21

Abstract

The utility model provides a medical implant, including embolism spring coil and at least one strand polymer fibre, the fibrous length of polymer is greater than the length of embolism spring coil, polymer fibre arranges the outside of embolism spring coil, and follow the one end of embolism spring coil is to other end axial extension. After the medical implant is implanted into a tumor cavity of hemangioma, the contact area of the medical implant and blood can be increased, embolus can be accelerated, and the curative effect can be improved.

Description

Medical implant

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to medical implant.

Background

Intracranial aneurysms are cerebrovascular diseases with high morbidity and mortality, and are the leading cause of subarachnoid hemorrhage. With the advancement of medical technology, the development of device materials and the experience accumulation of neuro-interventionalists, intravascular treatment has become the first choice for reducing the reoccurrence rate and mortality rate of ruptured intracranial aneurysms. Among many intravascular treatment schemes, aneurysm coil embolization therapy is widely used due to its advantages of convenience in operation, stability in implantation, safety, effectiveness, and the like.

However, when the coil is used for embolizing an aneurysm, due to the structural characteristics of the coil, even if the coil sufficiently fills the aneurysm cavity of the aneurysm, a large area of gap still exists in the aneurysm cavity, and blood can still slowly flow in the gap, so that the embolization time is long, and even the embolization of the aneurysm is caused by serious patients.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a medical implant, it has great area of contact with blood after the tumour chamber of implanting hemangioma, can accelerate hemangioma's thrombosis, improves the curative effect.

To achieve the above objects, the present invention provides a medical implant comprising an embolic coil and at least one strand of polymeric fiber, the length of the polymeric fiber being greater than the length of the embolic coil, the polymeric fiber being disposed outside of the embolic coil and extending along one end of the embolic coil towards the other end.

Optionally, the length of the polymer fiber is 1.5-2.0 times the length of the embolic coil.

Optionally, the medical implant further comprises a restraining member disposed on the outer circumferential surface of the embolic coil and configured to radially restrain the polymer fibers at intervals in the axial direction of the embolic coil so that the distance between the polymer fibers and the outer circumferential surface of the embolic coil is within a predetermined range at the position of the restraining member.

Optionally, the binding piece is a three-dimensional spiral structure sleeved on the outer circumferential surface of the embolic coil, and a gap is formed between the binding piece and the outer circumferential surface of the embolic coil; the polymer fibers pass through the gap.

Optionally, the gap has a dimension 2-3 times the filament diameter of the polymer fiber in a radial direction of the embolic coil.

Optionally, the pitch of the tie is greater than the pitch of the embolic coil, and/or the pitch of the tie is 10-20 times the wire diameter of the wire forming the tie.

Optionally, both ends of the polymer fiber and both ends of the tether are connected to both ends of the embolic coil, respectively.

Optionally, the medical implant further comprises a first connector and a second connector, the proximal end of the embolic coil, the proximal end of the polymer fiber and the proximal end of the tether are connected by the first connector, and the distal end of the embolic coil, the distal end of the polymer fiber and the distal end of the tether are connected by the second connector.

Optionally, the first connector and the second connector are both of a hemispherical structure, and a hemispherical surface of the second connector are disposed away from each other.

Optionally, the medical implant comprises a plurality of strands of the polymer fibers spaced circumferentially along the embolic coil.

Compared with the prior art, the medical implant of the utility model has the advantages that:

the foregoing medical implant comprises an embolic coil and at least one strand of polymeric fiber having a length greater than the length of the embolic coil, the polymeric fiber being disposed outside of the embolic coil and extending along one end of the embolic coil to the other end. When the medical implant is implanted into a tumor cavity of hemangioma, the polymer fiber can be fully stretched, so that the medical implant has a larger contact area with blood, the formation of thrombus is accelerated, and the curative effect is improved.

Further, the medical implant also comprises a restraining piece which is arranged on the embolic coil and used for radially limiting the polymer fibers at intervals in the axial direction of the embolic coil, so that the distance between the polymer fibers and the outer peripheral surface of the embolic coil is within a preset range at the position of the restraining piece, and the polymer fibers are prevented from being intertwined and knotted.

Drawings

The accompanying drawings are included to provide a better understanding of the present invention and are not intended to constitute an undue limitation on the invention. Wherein:

FIG. 1 is a schematic view of a medical implant according to one embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of a medical implant according to one embodiment of the present invention;

fig. 3 is a schematic view of a partial structure of a medical implant according to an embodiment of the present invention.

[ reference numerals are described below ]:

110-embolic coil, 120-polymer fiber, 130-tether, 101-gap, 141-first connector, 142-second connector.

Detailed Description

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

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

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

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

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

Referring to fig. 1-3, the medical implant includes an embolic coil 110 and at least one strand of polymer fibers 120. The length of the polymer fibers 120 is greater than the length of the embolic coil 110, and the polymer fibers 120 are disposed outside of the embolic coil 110 and extend along one end of the embolic coil 110 to the other. Here, the length of the embolic coil 110 refers to the axial dimension of the embolic coil 110, and the length of the polymer fibers 120 refers to the dimension of the polymer fibers 120 when stretched into a linear state.

When the medical implant is implanted in the tumor cavity of the hemangioma, since the length of the polymer fibers 120 is greater than the length of the embolic coil 110, the middle portion of the polymer fibers 120 can stretch away from the outer circumferential surface of the embolic coil 110 and in the blood to increase the contact area of the medical implant with the blood and accelerate the thrombolysis of the hemangioma. The vascular aneurysm includes, but is not limited to, an aneurysm, and the length of the polymer fiber 120 may be 1.5-2.0 times the length of the embolic coil 110.

In an embodiment of the present invention, embolic coil 110 is wound from a single strand of wire, which may be any of the materials including, but not limited to, platinum-tungsten alloy, palladium, and tantalum. The wire diameter of the wire is 0.001 to 0.003 inches. The embolic coil 110 has an outer diameter of 0.008-0.012 inches, and the embolic coil 110 can have a uniform or non-uniform pitch that is 1.2-1.5 times the wire diameter of the wire.

The material of the polymer fiber 120 includes, but is not limited to, relatively soft polymer materials such as polypropylene (PP), polylactic acid (PLA), nylon, and poly (lactide-co-glycolide) (PLGA), and the filament diameter of the polymer fiber 120 is 0.0001 inch to 0.0005 inch. When the medical implant comprises a plurality of strands of the polymer fiber 120, the plurality of strands of the polymer fiber 120 are spaced circumferentially along the embolic coil 110.

Preferably, the ends of the polymer fibers 120 are attached to the ends of the embolic coil 110, respectively, i.e., the distal end of the polymer fibers 120 is attached to the distal end of the embolic coil 110 and the proximal end of the polymer fibers 120 is attached to the proximal end of the embolic coil 110, to prevent the polymer fibers 120 from separating from the embolic coil 110. Here, the polymer fibers 120 may be directly or indirectly attached to the embolic coil 110.

Further, with continued reference to fig. 1-3, the medical implant further comprises a restraining member 130, wherein the restraining member 130 is disposed on the outer circumferential surface of the embolic coil 110 and is used for radially restraining the polymer fibers 120 at intervals in the axial direction of the embolic coil 110, so that the distance between the polymer fibers 120 and the outer circumferential surface of the embolic coil 110 is within a predetermined range at the position of the restraining member 130.

In detail, the binding member 130 is a three-dimensional spiral structure sleeved on the outer circumferential surface of the embolic coil 110, and a gap 101 is formed between the binding member 130 and the outer circumferential surface of the embolic coil 110. The polymer fibers 120 pass through the gap 101. That is, at the tether 130, the polymer fibers 120 are constrained between the outer circumference of the embolic coil 110 and the tether 130, and the maximum value of the predetermined range is the dimension of the gap 101 in the radial direction of the embolic coil 110. This has the advantage of preventing the polymer fibers 120 from tangling and kinking. Optionally, in the radial direction of the embolic coil 110, the size of the gap 101 is 2-3 times the wire diameter of the polymer fiber 120, so that the polymer fiber 120 can freely move at the tether 130 in the axial and circumferential directions of the embolic coil 110, thereby allowing the polymer fiber 120 to stretch between two adjacent coils of the tether 130.

The tether 130 may be formed from a wire or polymer wire that is helically wrapped around the axis of the embolic coil 110, and the tether 130 may also be biocompatible, and alternative materials include, but are not limited to, platinum, tungsten, platinum-tungsten alloy, or poly (glycolide). The wire used to form the tether 130 may have a wire diameter of 0.0005 inch to 0.0015 inch, the outer diameter of the tether 130 may be 0.008 inch to 0.012 inch, and the pitch of the tether 130 may be greater than the pitch of the embolic coil 110, and particularly may be 10 to 20 times the wire diameter of the wire used to form the tether 130, so that the polymer fibers 120 are sufficiently spread and infiltrated in blood to enhance the embolization effect.

In addition, the two ends of the tether 130 are connected to the two ends of the embolic coil 110 (either directly or indirectly), i.e., the proximal end of the tether 130 is connected to the proximal end of the embolic coil 110 and the distal end of the tether 130 is connected to the distal end of the embolic coil 110.

Specifically, with continued reference to fig. 1 to 3, the medical implant further includes a first connector 141 and a second connector 142. The proximal end of the embolic coil 110, the proximal end of the polymer fiber 120, and the proximal end of the tether 130 are indirectly connected by the first connector 141, and the distal end of the embolic coil 110, the distal end of the polymer fiber 120, and the distal end of the tether 130 are indirectly connected by the second connector 142.

Preferably, the first connector 141 and the second connector 142 are both of a hemispherical structure, and the hemispherical surfaces of the first connector 141 and the second connector 142 are arranged away from each other, that is, the hemispherical surface of the first connector 141 is arranged towards the proximal end, and the hemispherical surface of the second connector 142 is arranged towards the distal end, so that the medical implant can be prevented from damaging the tumor wall of the hemangioma. In the embodiment of the present invention, the first connecting body 141 and the second connecting body 142 may be formed by curing an adhesive, such as an ultraviolet light curing adhesive.

The utility model provides a technical scheme, through set up polymer fiber on the embolism spring ring after the tumor chamber of hemangioma is implanted to medical implant, can increase the area of contact of medical implant and blood promotes hemangioma thrombosis, improves treatment.

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 and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A medical implant comprising an embolic coil and at least one strand of polymeric fibers, the polymeric fibers having a length greater than the length of the embolic coil, the polymeric fibers being disposed outside of the embolic coil and extending along one end of the embolic coil to the other end.

2. The medical implant of claim 1, wherein the length of the polymer fiber is 1.5 to 2.0 times the length of the embolic coil.

3. The medical implant of claim 1, further comprising a tether disposed on the outer peripheral surface of the embolic coil and configured to radially position the polymer fiber at intervals in the axial direction of the embolic coil such that the distance between the polymer fiber and the outer peripheral surface of the embolic coil is within a predetermined range at the location of the tether.

4. The medical implant of claim 3, wherein the tether is a three-dimensional helical structure that fits over the outer peripheral surface of the embolic coil with a gap therebetween; the polymer fibers pass through the gap.

5. The medical implant of claim 4, wherein the gap has a dimension 2-3 times the filament diameter of the polymer fiber in a radial direction of the embolic coil.

6. The medical implant of claim 4, wherein a pitch of said tether is greater than a pitch of said embolic coil, and/or wherein a pitch of said tether is 10-20 times a wire diameter of a wire forming said tether.

7. The medical implant of claim 3, wherein both ends of said polymer fiber and both ends of said tether are connected to both ends of said embolic coil, respectively.

8. The medical implant of claim 7, further comprising a first connector and a second connector, wherein the proximal end of the embolic coil, the proximal end of the polymer fiber, and the proximal end of the tether are connected by the first connector, and wherein the distal end of the embolic coil, the distal end of the polymer fiber, and the distal end of the tether are connected by the second connector.

9. The medical implant of claim 8, wherein the first connector and the second connector are each a hemispherical structure, and the hemispherical surface of the second connector are disposed away from each other.

10. The medical implant of claim 1, comprising a plurality of strands of the polymer fibers spaced circumferentially along the embolic coil.