An expandable stent and balloon stent system

Abstract

This invention provides an expandable stent and balloon stent system. The expandable stent is used in percutaneous vertebroplasty and includes a stent body with several supporting ribs and several connecting ribs. The supporting ribs are arranged side by side, and adjacent supporting ribs are connected by the connecting ribs. Each row of supporting ribs is connected end to end to form a ring, giving the stent body a hollow structure. The expandable stent provided by this invention has connecting ribs extending from between the supporting ribs, connecting adjacent rows of supporting ribs, and each row of supporting ribs is connected end to end, effectively solving the problem of balloon abrasion when the stent body is expanded. Furthermore, this design allows the supporting ribs to be interwoven, resulting in a more even pressure distribution when the stent body is expanded, reducing the pressure required for expansion. More importantly, the interwoven distribution of connecting ribs and supporting ribs creates a denser mesh structure in the stent body, effectively reducing the rebound of the stent body after expansion.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an expandable stent and balloon stent system. Background Technology

[0002] Percutaneous vertebroplasty (PVS) is a minimally invasive surgical procedure primarily used to treat vertebral compression fractures, especially those caused by osteoporosis or trauma. The procedure involves wrapping a metal stent around a balloon; pressure applied to the balloon causes the stent to expand, supporting the injured vertebra and preventing re-collapse after balloon removal. The stent restores vertebral height and stability, ultimately relieving pain and improving function.

[0003] However, the surface ribs of existing percutaneous vertebroplasty metal stents are not connected end-to-end to form a closed mesh structure, leaving gaps between the two sides. During expansion, the side walls can easily cut into the balloon, posing a risk of balloon rupture. Furthermore, the metal stent requires significant pressure to expand, making it difficult to open and prone to springback after expansion.

[0004] All of the above factors can adversely affect the final outcome and safety of the surgery. Therefore, there is a need for a stent that can effectively reduce the risk of balloon rupture during inflatation, lower the pressure required for inflatation, and reduce the problem of stent rebound after inflatation. Utility Model Content

[0005] The purpose of this invention is to provide an expandable stent and balloon stent system that prevents the balloon from being punctured when the main stent structure is expanded, thereby reducing the risk of surgery and improving safety.

[0006] To achieve the above objectives, in a first aspect, this utility model provides an expandable support for percutaneous vertebroplasty, comprising: The main body of the support has several supporting ribs and several connecting ribs. The supporting ribs are arranged side by side, and adjacent rows of supporting ribs are connected by the connecting ribs. Each row of supporting ribs is connected end to end to form a ring, so that the main body of the support has a hollow structure. In some embodiments, the support rib has a first connecting portion, a second connecting portion, a first extension portion, and a second extension portion; A plurality of first extension portions and a plurality of second extension portions are arranged alternately at intervals in sequence; A plurality of first connecting portions and second connecting portions are respectively located on both sides of the first extension portion and the second extension portion for connecting adjacent first extension portions and second extension portions; Wherein, the bottom end of the first connecting part is connected to the proximal end of the first extension part, the top end of the first connecting part is connected to the proximal end of the second extension part, the bottom end of the second connecting part is connected to the distal end of the second extension part, and the top end of the second connecting part is connected to the distal end of the first extension part.

[0007] In some embodiments, the first connecting portion corresponds to the second connecting portion and faces opposite directions.

[0008] In some embodiments, in two adjacent rows of support ribs, the support ribs closer to the proximal end of the support body are defined as first support ribs, and the support ribs closer to the distal end of the support body are defined as second support ribs. The first connecting portion of the first supporting rib corresponds to the first connecting portion of the second supporting rib and faces the same direction.

[0009] In some embodiments, the connecting rib includes a first connecting rib and a second connecting rib; The proximal end of the first connecting rib is connected to the inner wall of the second extension of the first supporting rib, and the distal end of the first connecting rib is connected to the first connecting portion of the second supporting rib; the proximal end of the second connecting rib is connected to the second connecting portion of the first supporting rib, and the distal end of the second connecting rib is connected to the outer wall of the first extension of the second supporting rib, so that the sidewall of the support body is a mesh structure.

[0010] In some embodiments, in two adjacent rows of support ribs, the support ribs closer to the proximal end of the support body are defined as first support ribs, and the support ribs closer to the distal end of the support body are defined as second support ribs. The first connecting portion of the first supporting rib corresponds to the second connecting portion of the second supporting rib and faces opposite directions. The proximal end of the connecting rib is connected to the second connecting portion of the first supporting rib, and the distal end is connected to the first connecting portion of the second supporting rib.

[0011] In some embodiments, both the first connecting portion and the second connecting portion are arc-shaped structures.

[0012] In some embodiments, the cross-sectional dimension of the connecting rib is smaller than that of the supporting rib.

[0013] Secondly, this utility model provides a balloon stent system, including a balloon, an extension tube, a three-way valve, and the expandable stent; The distal end of the extension tube is connected to the balloon; The main body of the stent is fitted onto the balloon; One end of the three-way valve is connected to the proximal end of the extension tube, and the other end is used to connect to the pressure filler. When the pressure inflator applies air pressure to the balloon, the balloon volume increases and expands the support body. When the balloon is depressurized, the shape of the support body remains unchanged.

[0014] In some embodiments, the number of balloons, extension tubes, and stent bodies are all two; The three-way valve has an input end, a first output end, and a second output end. The input end is used to connect to the pressure filler. The first output end is connected to the proximal end of one of the extension tubes, and the second output end is connected to the proximal end of the other extension tube.

[0015] The advantages of the expandable stent and balloon stent system provided by this utility model are as follows: 1. The main body of the support frame has supporting ribs and connecting ribs. The connecting ribs extend from between the supporting ribs, connecting adjacent rows of supporting ribs. Furthermore, the supporting ribs in each row are connected end-to-end, effectively solving the problem of the balloon being scratched when the support frame is expanded. This design also allows the supporting ribs to be interconnected in an interlaced manner, resulting in even pressure distribution when the support frame is expanded, reducing the pressure required for expansion. More importantly, the interlaced distribution of connecting ribs and supporting ribs creates a denser mesh structure in the support frame, effectively reducing the rebound of the support frame after expansion.

[0016] 2. The balloon stent system can simultaneously expand the two stent bodies by using a three-way valve and a pressure inflator, so that the pressure on the vertebral body is more balanced. Attached Figure Description

[0017] Figure 1 A front view of the support body provided in an embodiment of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 A front view of the main body of the bracket according to another embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the balloon stent system provided in the embodiment of the present invention; Figure 5 A schematic diagram of the structure of another embodiment of the balloon stent system provided by this utility model; Figure label: The bracket body 1, support rib 11, first connecting part 111, second connecting part 112, first extension part 113, second extension part 114, connecting rib 12, first connecting rib 121, second connecting rib 122, balloon 2, extension tube 3, three-way valve 4, input end 41, first output end 42, second output end 43. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects. Unless otherwise specified, the term "connection" as used herein can refer to a direct connection or an indirect connection, i.e., a connection through an intermediate object.

[0019] Furthermore, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first" and "second" used herein are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0020] Furthermore, the term "distal" in the text refers to the end that is far from the operator and close to the patient; the term "proximal" refers to the end that is close to the operator and far from the patient.

[0021] To address the problems existing in the prior art, embodiments of this utility model provide an expandable stent for percutaneous vertebroplasty, as described above. Figure 1 As shown, the expandable support includes a support body 1, which has a plurality of supporting ribs 11 and a plurality of connecting ribs 12. The plurality of supporting ribs 11 are arranged side by side in sequence, and each row of supporting ribs 11 is connected end to end to form a ring. Adjacent rows of supporting ribs 11 are connected by the connecting ribs 12, so that the support body 1 has a hollow cylindrical structure.

[0022] In this embodiment, the support body 1 is made of metal so that it can maintain its shape after being expanded. Furthermore, since each row of support ribs 11 is arranged in a ring shape with adjacent ends, the inner walls of the support body 1 are all curved surfaces. Therefore, when the support body 1 is expanded, there will be no scratches or ruptures to the balloon at the structural edges, thus ensuring the reliability of percutaneous vertebroplasty.

[0023] refer to Figure 1 and Figure 2 As shown, in some embodiments, the support rib 11 has a first connecting portion 111, a second connecting portion 112, a first extension portion 113, and a second extension portion 114. A plurality of first extension portions 113 and a plurality of second extension portions 114 are alternately spaced, and adjacent first extension portions 113 and second extension portions 114 are parallel. A plurality of first connecting portions 111 and second connecting portions 112 are located on both sides of the first extension portions 113 and the second extension portions 114, respectively, to connect adjacent first extension portions 113 and second extension portions 114, forming a "U"-shaped structure.

[0024] Specifically, the first connecting portion 111 is located to the left of the first extension portion 113 and the second extension portion 114, that is, on the side near the proximal end of the support body 1. The bottom end of the first connecting portion 111 is connected to the proximal end of the first extension portion 113, and the top end of the first connecting portion 111 is connected to the proximal end of the second extension portion 114. The second connecting portion 112 is located to the right of the first extension portion 113 and the second extension portion 114. The bottom end of the second connecting portion 112 is connected to the distal end of the second extension portion 114, and the top end of the second connecting portion 112 is connected to the distal end of the first extension portion 113 located above it.

[0025] In this embodiment, the support ribs 11 are designed in the manner described above, so that the support ribs 11 are interlocked and connected to each other. When the balloon is placed in the support body 1 and inflated, the pressure when the support body 1 is expanded is evenly distributed, reducing the pressure required for expansion and reducing rebound.

[0026] Furthermore, both the first connecting portion 111 and the second connecting portion 112 are arc-shaped structures, and the arc-shaped surfaces formed by the inner walls of the first connecting portion 111 and the second connecting portion 112 both face the center of the supporting rib 11. This design allows the support body 1 to be better expanded.

[0027] refer to Figure 1 and Figure 2As shown, in some embodiments, the connecting rib 12 includes a first connecting rib 121 and a second connecting rib 122. Furthermore, for ease of explanation, in two adjacent rows of supporting ribs 11, the supporting rib 11 near the proximal end of the support body 1 is defined as the first supporting rib, and the supporting rib 11 near the distal end of the support body 1 is defined as the second supporting rib. That is, the first supporting rib is located on the left side, and the second supporting rib is located on the right side, and the first connecting portion 111 of the first supporting rib corresponds to the first connecting portion 111 of the second supporting rib and faces the same direction.

[0028] For details, please refer to the following: Figure 2 As shown, the proximal end of the first connecting rib 121 is connected to the inner wall of the second extension 114 in the first supporting rib, and the distal end of the first connecting rib 121 is connected to the first connecting portion 111 in the second supporting rib. The proximal end of the second connecting rib 122 is connected to the second connecting portion 112 in the first supporting rib, and the distal end of the second connecting rib 122 is connected to the outer wall of the first extension 113 in the second supporting rib, so that the sidewall of the support body 1 is a mesh structure.

[0029] In this embodiment, the supporting ribs 11 are connected into a mesh structure by the connecting ribs 12, so that the overall structure of the support body 1 is more compact, effectively reducing the phenomenon of the support body 1 rebounding after being stretched, and improving the success rate of the operation.

[0030] refer to Figure 3 As shown, in another embodiment, for the same purpose of facilitating the description of the structure of the support body 1, in two adjacent rows of support ribs 11, the support rib 11 near the proximal end of the support body 1 is defined as the first support rib, and the support rib 11 near the distal end of the support body 1 is defined as the second support rib.

[0031] Wherein, the second connecting portion 112 of the first supporting rib corresponds to the first connecting portion 111 of the second supporting rib and faces opposite directions, the proximal end of the connecting rib 12 is connected to the second connecting portion 112 in the first supporting rib, and the distal end of the connecting rib 12 is connected to the first connecting portion 111 in the second supporting rib. The second connecting portion 112 and the first connecting portion 111 are positioned corresponding to each other and face opposite directions, so that the length of the connecting rib 12 is shorter.

[0032] In this embodiment, adjacent rows of support ribs 11 are connected by shorter connecting ribs 12. This design has a simple structure and is easy to process.

[0033] In some embodiments, the cross-sectional dimension of the connecting rib 12 is smaller than the cross-sectional dimension of the supporting rib 11.

[0034] In another embodiment of this utility model, a balloon stent system is provided, with reference to... Figure 4 As shown, the balloon stent system includes a balloon 2, an extension tube 3, a three-way valve 4, and an expandable stent provided in the above embodiment. The distal end of the extension tube 3 is connected to the balloon 2, the stent body 1 is fitted onto the balloon 2, one end of the three-way valve 4 is connected to the proximal end of the extension tube 3, and the other end is used to connect to a pressure inflator.

[0035] When the pressure inflator applies air pressure to the balloon 2, the balloon 2 increases in volume and expands the support body 1. When the balloon 2 is depressurized, the shape of the support body 1 remains unchanged.

[0036] In this embodiment, the stent body 1 is used in the balloon stent system, effectively solving the problem of the stent body 1 scratching the balloon 2 when it is expanded during surgery. It also avoids the phenomenon of the stent body 1 rebounding after the balloon 2 is depressurized.

[0037] refer to Figure 5 As shown, in some embodiments, there are two balloons 2, two extension tubes 3, and two stent bodies 1. The three-way valve 4 has an input end 41, a first output end 42, and a second output end 43. The input end 41 is connected to the pressure filler. The first output end 42 is connected to the proximal end of the first extension tube 3, and the second output end 43 is connected to the proximal end of the second extension tube 3. Each extension tube 3 has a balloon 2 connected to its distal end, and each balloon 2 is fitted with a stent body 1.

[0038] In this embodiment, the balloon stent system, through the three-way valve 4 and a pressure inflator, can simultaneously expand the two stent bodies 1, resulting in more even pressure on the vertebral body during surgery. This also avoids the possibility of vertebral collapse that can occur when using a single stent body 1 during surgery.

[0039] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. A radially expandable stent for use in percutaneous vertebroplasty, comprising: include: The main body of the support (1) has a number of supporting ribs (11) and a number of connecting ribs (12). The supporting ribs (11) are arranged side by side, and adjacent rows of supporting ribs (11) are connected by the connecting ribs (12). Each row of supporting ribs (11) is connected end to end to form a ring, so that the main body of the support (1) has a hollow structure.

2. The expandable stent of claim 1, wherein, The supporting rib has a first connecting part (111), a second connecting part (112), a first extension part (113), and a second extension part (114). A plurality of first extension portions (113) and a plurality of second extension portions (114) are arranged alternately at intervals in sequence; A plurality of first connecting portions (111) and second connecting portions (112) are located on both sides of the first extension portion (113) and the second extension portion (114) respectively for connecting adjacent first extension portions (113) and second extension portions (114).

3. The expandable support according to claim 2, characterized in that, In two adjacent rows of support ribs (11), the support ribs near the proximal end of the support body (1) are defined as the first support ribs, and the support ribs near the distal end of the support body are defined as the second support ribs. The first connecting portion (111) of the first supporting rib corresponds to the first connecting portion (111) of the second supporting rib and faces the same direction.

4. The expandable stent of claim 3, wherein, The connecting rib (12) includes a first connecting rib (121) and a second connecting rib (122); The proximal end of the first connecting rib (121) is connected to the inner wall of the second extension (114) in the first supporting rib, and the distal end of the first connecting rib (121) is connected to the first connecting part (111) in the second supporting rib; the proximal end of the second connecting rib (122) is connected to the second connecting part (112) in the first supporting rib, and the distal end of the second connecting rib (122) is connected to the outer wall of the first extension (113) in the second supporting rib, so that the sidewall of the support body is a mesh structure.

5. The expandable stent of claim 2, wherein, In two adjacent rows of support ribs (11), the support ribs near the proximal end of the support body (1) are defined as the first support ribs, and the support ribs near the distal end of the support body are defined as the second support ribs. The first connecting part (111) corresponds to the second connecting part (112) and faces opposite directions. The proximal end of the connecting rib (12) is connected to the second connecting part (112) in the first supporting rib, and the distal end of the connecting rib (12) is connected to the first connecting part (111) in the second supporting rib.

6. The expandable stent of claim 2, wherein, Both the first connecting part and the second connecting part are arc-shaped structures.

7. The expandable stent of claim 2, wherein, The bottom end of the first connecting portion (111) is connected to the proximal end of the first extension portion (113), the top end of the first connecting portion (111) is connected to the proximal end of the second extension portion (114), the bottom end of the second connecting portion (112) is connected to the distal end of the second extension portion (114), and the top end of the second connecting portion (112) is connected to the distal end of the first extension portion (113).

8. The expandable stent of any one of claims 1 to 7, wherein, The cross-sectional dimension of the connecting rib (12) is smaller than that of the supporting rib (11).

9. A balloon stent system, characterized in that, Includes a balloon (2), an extension tube (3), a three-way valve (4), and an expandable stent as described in any one of claims 1 to 8; The distal end of the extension tube (3) is connected to the balloon (2); The stent body (1) is fitted onto the balloon (2); One end of the three-way valve (4) is connected to the proximal end of the extension tube (3), and the other end is used to connect to the pressure filler. When the pressure inflator applies air pressure to the balloon, the balloon (2) increases in volume and expands the support body (1). When the balloon (2) is depressurized, the shape of the support body (1) remains unchanged.

10. The balloon stent system of claim 9, wherein, The number of balloons (2), extension tubes (3) and stent bodies (1) are all two; The three-way valve has an input end (41), a first output end (42) and a second output end (43). The input end (41) is used to connect to the pressure filler. The first output end (42) is connected to the proximal end of one of the extension tubes (3), and the second output end (43) is connected to the proximal end of the other extension tube (3).

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