CN218009845U

CN218009845U - Current limiting device

Info

Publication number: CN218009845U
Application number: CN202221869293.3U
Authority: CN
Inventors: 谈睿; 沈子阳; 戴会新; 李菲; 孙云
Original assignee: Wuhan Topology Transformation Medical Research Center Co ltd
Current assignee: Wuhan Topology Transformation Medical Research Center Co ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2022-12-13
Anticipated expiration: 2032-07-19

Abstract

The utility model relates to a current limiting device, it is including being the heliciform and having elastic first flaring portion, and first flaring portion encloses to establish and forms first cavity, and along first direction, the diameter of first cavity reduces gradually, and first flaring portion can support by elasticity in the blood vessel inner wall along at least partial region on the first direction, and wherein, the first direction is on a parallel with the axial of first flaring portion. Above-mentioned current limiting device, first flaring portion enclose to establish and form first cavity, and along first direction, the diameter of first cavity reduces gradually, and first cavity is the toper promptly to the flow that makes the blood through first cavity reduces, thereby reaches the effect of current-limiting. First flaring portion can support in the blood vessel inner wall along the at least part region elasticity of first direction to install first flaring portion in the blood vessel, first flaring portion is the heliciform and has elasticity moreover, then first flaring portion can be compressed or can automatic re-setting after the compression, is convenient for transport first flaring portion in the blood vessel.

Description

Current limiting device

Technical Field

The utility model relates to the technical field of medical machinery, especially, relate to a current limiting device.

Background

Stable angina pectoris is a clinical syndrome with paroxysmal chest pain or chest discomfort caused by insufficient blood supply to coronary arteries, acute transient ischemia and hypoxia of cardiac muscle. Aiming at the diseases such as angina pectoris, the vascular flow can be reduced by tightening blood vessels, and the symptoms of angina pectoris can be relieved. However, the existing current limiting device has a complex structure.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is necessary to provide a current limiting device in order to solve the problem of the conventional current limiting device that the structure is complicated.

A current limiting device comprising:

be the heliciform and have elastic first flaring portion, first flaring portion encloses to establish and forms first cavity, along first direction, the diameter of first cavity reduces gradually, just first flaring portion is followed at least some region can support in the blood vessel inner wall in the first direction by elasticity, wherein, first direction is on a parallel with the axial of first flaring portion.

In one embodiment, the flow limiting device further includes a second flared portion which is spiral and has elasticity, the second flared portion surrounds to form a second cavity, the second cavity is connected to the first flared portion, the second flared portion is communicated with the first cavity, the diameter of the second cavity is gradually increased along the first direction, and at least a partial region of the second flared portion along the first direction can elastically abut against the inner wall of the blood vessel.

In one embodiment, the flow limiting device further includes a transition portion which is spiral and elastic, the transition portion is located between the first flared portion and the second flared portion, the first flared portion is connected to the second flared portion through the transition portion, the transition portion is surrounded to form a third cavity, the third cavity is communicated with the first cavity and the second cavity, and the diameter of the third cavity is unchanged along the first direction.

In one embodiment, the first flared portion and the second flared portion are symmetrically distributed on both sides of the transition portion.

In one embodiment, the flow restriction device is configured to be helically wound around by a nickel titanium wire to form the first flared portion, the second flared portion, and the transition portion as a single piece.

In one embodiment, the ends of the nitinol wire are bent and the two ends are respectively in the first cavity and the second cavity.

In one embodiment, the pitch of the current limiting device is equal to the diameter of the nickel titanium wire.

In one embodiment, the nickel-titanium wire is provided with a plurality of protrusions and/or grooves arranged along the self axial direction on the outer peripheral surface. In one embodiment, the first flared portion is configured to be formed by spirally winding a nickel-titanium wire, the diameter of the nickel-titanium wire is gradually increased along the first direction, and the whole area of the first flared portion along the first direction is used for elastically resisting against the inner wall of the blood vessel

In one embodiment, the flow limiting device further includes a second flared portion which is spiral and has elasticity, the second flared portion is cylindrical, the second flared portion is connected to the first flared portion, a second cylindrical cavity is defined by the second flared portion, the second cavity is communicated with the first cavity, and all areas of the second flared portion along the first direction are used for elastically supporting the inner wall of the blood vessel.

The utility model has the advantages that:

above-mentioned current limiting device, first flaring portion enclose to establish and form first cavity, and along first direction, the diameter of first cavity reduces gradually, and first cavity is the toper promptly to the messenger reduces through the flow of first cavity, thereby reaches the effect of current-limiting, and wherein, first direction is on a parallel with the axial of first flaring portion. First flaring portion can support in the blood vessel inner wall along the at least part region elasticity of first direction to install first flaring portion in the blood vessel, first flaring portion is the heliciform and has elasticity moreover, then first flaring portion can be compressed or can automatic re-setting after the compression, is convenient for transport first flaring portion in the blood vessel. The utility model provides a current limiting device only needs to be the heliciform and have elastic first flaring portion and transport to the blood vessel in, first flaring portion can support in the blood vessel inner wall along the at least part region in the first direction by elasticity, can realize the installation of first flaring portion, and the blood flow reaches the effect of current-limiting through first cavity flow.

Drawings

Fig. 1 is a schematic view of a first view angle structure of a current limiting device according to an embodiment of the present invention;

fig. 2 is a schematic view of a second view angle structure of a current limiting device according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a compressed current limiting device according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a mold provided in an embodiment of the present invention;

fig. 5 is a schematic structural view of a flow limiting device compressed in a conveying assembly according to an embodiment of the present invention.

In the figure:

100. a first flared portion;

200. a second flared portion;

300. a transition section;

400. a nickel titanium wire;

500. a mold;

600. a delivery assembly; 610. an outer tube; 620. an inner tube; 630. and a limiting boss.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

An embodiment of the utility model provides a current limiting device, as shown in fig. 1 and fig. 2, it is including being the heliciform and having elastic first flaring portion 100, and first flaring portion 100 encloses to establish and forms first cavity, and along first direction, the diameter of first cavity reduces gradually, and first flaring portion 100 can support in the blood vessel inner wall by elasticity along the at least part region of first direction, and wherein, the first direction is on a parallel with the axial of first flaring portion 100.

In the flow limiting device, the first flared portion 100 encloses to form a first cavity, and the diameter of the first cavity gradually decreases along a first direction, that is, the first cavity is tapered, so that the flow of blood passing through the first cavity decreases, thereby achieving the effect of flow limiting, wherein the first direction is parallel to the axial direction of the first flared portion 100. The first flared portion 100 can elastically abut against the inner wall of the blood vessel along at least a partial region in the first direction, so that the first flared portion 100 is installed in the blood vessel, and the first flared portion 100 is spiral and has elasticity, so that the first flared portion 100 can be compressed or can be automatically reset after being compressed, and the first flared portion 100 can be conveniently transported in the blood vessel. The utility model provides a current limiting device only needs to be the heliciform and has elastic first flaring portion 100 and transports to the blood vessel in, and first flaring portion 100 can support in the blood vessel inner wall by elasticity along at least part region on the first direction, can realize the installation of first flaring portion 100, and the blood flow reaches the effect of current-limiting through first cavity flow.

It should be noted that the diameter of the first cavity is gradually reduced, that is, the first cavity is tapered, and when the flow direction of blood in the blood vessel is the same as the first direction, the blood first passes through the large end of the first cavity and then passes through the small end of the first cavity, so as to play a role in limiting the flow; because at least part of the area of the first flaring portion 100 along the first direction can elastically support the inner wall of the blood vessel, the blood is limited from flowing out of the first cavity, when the flow direction of the blood in the blood vessel is opposite to the first direction, the blood firstly passes through the small end of the first cavity and then passes through the large end of the first cavity, and the blood can only flow into the small end and then passes through the large end, and the flow limiting effect can also be achieved.

As shown in fig. 1 and fig. 2, in some embodiments, the flow limiting device further includes a second flared portion 200 having elasticity and being spiral-shaped, the second flared portion 200 is connected to the first flared portion 100, the second flared portion 200 encloses to form a second cavity, the second cavity is communicated with the first cavity, a diameter of the second cavity is gradually reduced along the first direction, and at least a partial region of the second flared portion 200 along the first direction can elastically abut against an inner wall of the blood vessel. The second flaring portion 200 connected with the first flaring portion 100 is arranged, the second flaring portion 200 encloses to form a cavity, the second cavity is communicated with the first cavity, the diameter of the second cavity is gradually increased along the first direction, namely the second cavity is conical, blood can sequentially flow through the first cavity and the second cavity, or firstly flow through the second cavity and then flow through the first cavity, at least partial region of the second flaring portion 200 along the first direction can elastically abut against the inner wall of a blood vessel, and therefore the second flaring portion 200 is installed in the blood vessel.

As shown in fig. 1 and 2, in some embodiments, the flow-limiting device further includes a transition portion 300 having a spiral shape and elasticity, the transition portion 300 is located between the first flared portion 100 and the second flared portion 200, the first flared portion 100 is connected to the second flared portion 200 through the transition portion 300, the transition portion 300 encloses to form a third cavity, the third cavity is communicated with the first cavity and the second cavity, and a diameter of the third cavity is constant along the first direction. The first flared part 100 and the second flared part 200 are connected through the transition part 300, the transition part 300 encloses to form a third cavity, the diameter of the third cavity is unchanged along the first direction, namely, the third cavity is cylindrical, the small end of the first cavity is communicated with one end of the transition part 300, and the small end of the second cavity is communicated with the other end of the transition part 300. When passing through the flow limiting device along the first direction, blood flows through the large end of the first cavity, the small end of the first cavity, the third cavity, the small end of the second cavity and the large end of the second cavity in sequence. When passing through the flow limiting device along a direction deviating from the first direction, blood flows through the large end of the second cavity, the small end of the second cavity, the third cavity, the small end of the first cavity and the large end of the first cavity in sequence.

Specifically, in some embodiments, the first and

second flares

100, 200 are symmetrically disposed on either side of the transition portion 300. That is, the first flared portion 100 and the second flared portion 200 are respectively located at two sides of the transition portion 300, the first flared portion 100 and the second flared portion 200 have the same structural dimension, and the first flared portion 100 and the second flared portion 200 are symmetrically arranged along a second direction, wherein the second direction is a direction perpendicular to the axis of the transition portion 300 where the middle point of the axis of the transition portion 300 is located. The first flared portion 100 and the second flared portion 200 have the same structural size, so that the processing is convenient, and the size of the second flared portion 200 does not need to be calculated additionally.

In some embodiments, the flow restriction device is configured to be helically encircled by a nitinol wire 400 to form the first flared portion 100, the second flared portion 200, and the transition portion 300 integrally connected. Using a die 500 shown in fig. 4, a ni — ti wire 400 is spirally wound around the die 500 to form a first flared portion 100, a second flared portion 200, and a transition portion 300 which are connected as a single body, wherein the first flared portion 100 and the second flared portion 200 are formed in a truncated cone shape, and the transition portion 300 is formed in a cylindrical shape. The current limiting device integrated into one piece that this embodiment provided only needs to set up specific size's mould 500, can the shaping through nickel titanium wire 400 spiral winding, the processing of being convenient for. And the nickel-titanium wire 400 has elasticity and shape memory function, and the nickel-titanium alloy realizes memory shaping by heating, and the die 500 is taken down after shaping to finish the shaping of the current limiting device. Because the nitinol wire 400 has elastic and shape memory properties, the current limiting device provided by this embodiment may be compressed to form a cylindrical structure as shown in fig. 3, or directly drawn into a filament shape for delivery to a blood vessel.

Specifically, in some embodiments, the ends of the nitinol wire 400 are bent and the two ends are within the first cavity and the second cavity, respectively. In this embodiment, a nickel-titanium wire 400 is spirally wound on a mold 500 to form a first flared portion 100, a second flared portion 200 and a transition portion 300 which are connected into a whole, so that the end of the nickel-titanium wire 400 is bent and positioned in the first cavity and the second cavity, thereby preventing the end of the nickel-titanium wire 400 from scratching the vessel wall.

Specifically, in some embodiments, the pitch of the current limiting device is equal to the diameter of the nitinol wire 400. The flow limiting device is formed by spirally winding the nickel-titanium wire 400, the thread pitch of the flow limiting device is equal to the diameter of the nickel-titanium wire 400, namely, the adjacent two circles of nickel-titanium wires 400 are tightly attached to each other, so that blood flows through the first cavity, the third cavity and the second cavity. It should be noted that the pitch of the flow restriction device is equal to the diameter of the ni-ti wire 400, that is, the pitch of the first flared portion 100, the pitch of the second flared portion 200, and the pitch of the transition portion 300 are equal to the diameter of the ni-ti wire 400.

In some embodiments, the ni-ti wire 400 has a plurality of protrusions and/or grooves arranged along its axial direction on its outer circumferential surface. The outer wall of the nickel-titanium wire 400 is provided with a plurality of bulges and/or a plurality of grooves, and when the nickel-titanium wire 400 is spirally wound to form the flow limiting device, the friction between the flow limiting device and the blood vessel wall is increased, and the blood flow flowing through the first cavity, the second cavity and the third cavity is reduced.

In some embodiments, the first flared portion 100 is configured to be formed by helically winding a nickel titanium wire 400 having a diameter that gradually increases along a first direction, and the entire area of the first flared portion 100 along the first direction is configured to elastically abut against the inner wall of the blood vessel. Along first direction, the diameter of first cavity reduces gradually, and first cavity is the toper, but nickel titanium wire diameter crescent, through the nickel titanium wire 400 that adopts the different diameters, makes the outer wall homoenergetic butt of the first flaring portion 100 of spiral winding formation in the vascular wall, improves the installation stability of first flaring portion 100 in the blood vessel, and at this moment, first flaring portion 100 is the cylinder.

In some embodiments, the flow limiting device further includes a second flared portion 200 having a spiral shape and elasticity, the second flared portion 200 is connected to the first flared portion 100, the second flared portion 200 is cylindrical, the second flared portion 200 encloses a second cylindrical cavity, the second cylindrical cavity is communicated with the first cylindrical cavity, and all regions of the second flared portion 200 along the first direction are used for elastically abutting against the inner wall of the blood vessel. The second flared portion 200 is disposed in a cylindrical shape, and the second flared portion 200 encloses a second cylindrical cavity, so that blood can flow out through the first flared portion 100 and the second flared portion 200, and a flow limiting effect can be achieved. It should be noted that, when blood sequentially passes through the first flared portion 100 and the second flared portion 200 in the first direction, the blood firstly passes through the first flared portion 100 to achieve a flow limiting effect, and then flows out through the second flared portion 200; blood follows and deviates from first direction second flaring portion 200 and first flaring portion 100 in proper order, and blood flows to the tip of first cavity through the second cavity earlier, and the main aspects of rethread first cavity, blood can only flow into tip rethread main aspects earlier, also can play the current-limiting effect equally.

The utility model also provides a delivery assembly 600 is convenient for transport the current limiting device to the blood vessel. The conveying assembly 600 comprises an outer pipe 610 and an inner pipe 620 sleeved in the outer pipe 610, the outer pipe 610 and the inner pipe 620 can move relatively, the flow limiting device is compressed and arranged between the inner pipe 620 and the outer pipe 610, and the inner pipe 620 plays a certain supporting role for the flow limiting device. The delivery assembly 600 transports the flow restriction device in a compressed state to the site to be treated, the outer tube 610 is drawn out in a direction away from the blood flow (i.e., away from the first direction), the flow restriction device is repositioned, at least partial regions of the first and second flared

portions

100 and 200 in the first direction abut against the inner wall of the blood vessel, and finally the inner tube 620 is drawn out, thereby installing the flow restriction device at the site to be treated. It should be noted that the flow limiting device in the compressed state may be cylindrically sleeved on the inner tube 620, or may be linearly disposed between the inner tube 620 and the outer tube 610.

Specifically, the conveying assembly 600 further comprises a limiting boss 630 arranged on the outer wall of the inner tube 620 or the inner wall of the outer tube 610, and the limiting boss 630 can abut against the end face of the flow limiting device to limit the flow limiting device from moving along the axial direction of the outer tube 610.

Specifically, the delivery assembly 600 further includes visualization rings disposed on the inner wall of the outer tube 610 and/or the outer wall of the inner tube 620, between which the flow restriction device can be positioned when the flow restriction device is in a compressed state, the visualization rings being disposed to facilitate determining a specific location of the flow restriction device when in a blood vessel.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A current limiting device, comprising:

be the heliciform and have elastic first flaring portion (100), first flaring portion (100) enclose to establish and form first cavity, along first direction, the diameter of first cavity reduces gradually, just first flaring portion (100) are followed at least some region can support in the blood vessel inner wall in first direction, wherein, first direction is on a parallel with the axial of first flaring portion (100).

2. The flow limiting device according to claim 1, wherein the flow limiting device further comprises a second flared portion (200) having a spiral shape and elasticity, the second flared portion (200) is connected to the first flared portion (100), the second flared portion (200) encloses to form a second cavity, the second cavity is communicated with the first cavity, the diameter of the second cavity is gradually increased along the first direction, and at least a partial region of the second flared portion (200) along the first direction can elastically abut against the inner wall of the blood vessel.

3. Flow-limiting device according to claim 2, characterized in that it further comprises a transition portion (300) having a spiral shape and elasticity, said transition portion (300) being located between said first flared portion (100) and said second flared portion (200), said first flared portion (100) being connected to said second flared portion (200) through said transition portion (300), said transition portion (300) being enclosed to form a third cavity, said third cavity being in communication with said first cavity and said second cavity, said third cavity having a constant diameter along said first direction.

4. Flow-limiting device according to claim 3, wherein the first flared portion (100) and the second flared portion (200) are symmetrically distributed on both sides of the transition portion (300).

5. Flow-limiting device according to claim 3, characterized in that it is configured to be helically wound by a nickel titanium wire (400) to form the first flared portion (100), the second flared portion (200) and the transition portion (300) in one piece.

6. The flow-limiting device of claim 5, wherein an end of the nitinol wire (400) is bent and both ends are located in the first cavity and the second cavity, respectively.

7. Flow-limiting device according to claim 5, characterized in that the pitch of the flow-limiting device is equal to the diameter of the NiTi wire (400).

8. The flow-limiting device according to claim 5, characterized in that the nickel titanium wire (400) is provided with a plurality of protrusions and/or grooves arranged along its own axial direction on its outer circumferential surface.

9. The flow limiting device according to claim 1, characterized in that the first flared portion (100) is configured to be formed by a nickel titanium wire (400) spirally wound, the diameter of the nickel titanium wire (400) gradually increasing along the first direction, and the entire area of the first flared portion (100) along the first direction is used for elastically abutting against the inner wall of the blood vessel.

10. The flow limiting device according to claim 1, wherein the flow limiting device further comprises a second flared portion (200) having a spiral shape and elasticity, the second flared portion (200) is connected to the first flared portion (100), the second flared portion (200) has a cylindrical shape, the second flared portion (200) encloses a second cylindrical cavity, the second cylindrical cavity is communicated with the first cylindrical cavity, and all areas of the second flared portion (200) along the first direction are used for elastically abutting against the inner wall of the blood vessel.