Connecting piece, support positioning device and support conveying system

Abstract

The utility model relates to the technical field of medical instruments, and discloses a connecting piece, a support positioning device and a support conveying system. The locking part is arranged at the far end of the connecting piece body, and the locking part is connected with a fixing piece in a clamping mode; when the locking part and the fixing piece move synchronously, the locking part is connected with the fixing piece in a positioning mode. And when the locking part moves relative to the fixing piece, the locking part is separated from the fixing piece. According to the connecting piece, when the fixing piece and the connecting piece are connected, the locking part is directly clamped and positioned on the fixing piece, so that the operation step of connecting the connecting piece and the fixing piece is simplified, the assembling difficulty of the connecting piece and the fixing piece is reduced, the assembling efficiency of the connecting piece and the fixing piece is improved, and the requirement for the skill of an operator is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a connector, a stent positioning device, and a stent delivery system. Background Technology

[0002] Heart valve delivery and replacement devices are used to deliver prosthetic heart valves to a target location, replacing diseased heart valves and restoring heart function. Existing heart valve delivery and replacement devices mainly consist of a delivery device and a prosthetic heart valve. The accurate placement of the prosthetic heart valve in the target area depends on the connection and release mechanism between the delivery device and the prosthetic heart valve.

[0003] The current conveying device is mainly connected by connectors, sleeves and fasteners. The specific connection method is that the sleeve has a through hole on the far side wall, the fastener has a fastener protrusion with a through hole, the fastener protrusion is fitted into the far end of the fastener so that the through hole of the sleeve is aligned with the through hole of the fastener protrusion, and then the connector passes through the two through holes to realize the connection between the sleeve and the fastener.

[0004] During the release of the heart valve prosthesis, the cannula is fixed in place, the connector is pulled back, and then the connection between the cannula and the protruding part of the fixation is removed. Finally, the cannula is withdrawn to complete the detachment of the delivery cannula from the heart valve stent.

[0005] However, current delivery devices require the connectors to pass through the through holes on the sleeve and the through holes protruding on the fixing parts during use. The inner diameter of these through holes is very small, so only connectors with small diameters can be used for perforation. This results in extremely high requirements for the perforation operation of the connectors, making the perforation operation difficult and the installation operation complicated, which affects the assembly efficiency of the sleeve and valve stent fixing parts. Utility Model Content

[0006] In view of this, the present invention provides a connector, a stent positioning device, and a stent delivery system to solve the problem of low assembly efficiency of cannula and valve stent fixation components in current heart valve delivery and replacement devices.

[0007] In a first aspect, this utility model provides a connector, comprising:

[0008] Connector body;

[0009] A locking part is disposed at the distal end of the connector body and is snapped into connection with the fixing part; when the locking part and the fixing part move synchronously, the locking part and the fixing part are positioned and connected; when the locking part moves relative to the fixing part, the locking part and the fixing part are separated.

[0010] The beneficial effects of the above-mentioned connectors are as follows:

[0011] The aforementioned connector, when connecting the fastener and the connector, directly snaps the locking part onto the fastener, simplifying the connection steps, reducing the assembly difficulty, improving the assembly efficiency, and lowering the skill requirements for operators.

[0012] Because the connection and separation process between the connector and the fixation component is simpler, the operation time can be significantly shortened and the operation efficiency improved.

[0013] In one optional embodiment, the locking part is snapped into a positioning part on the fixing member, the positioning part being a positioning groove or a positioning hole. Setting the positioning part as a simple positioning groove or positioning hole simplifies the structure while allowing it to snap into the locking part.

[0014] In one alternative embodiment, when connecting the locking part to the fastener, the locking part extends from the proximal end of the fastener along its bottom to the distal end and then embeds into the positioning part on the fastener.

[0015] The above technical solution allows for a simple and quick connection between the locking part and the fixing part. Operators can quickly and accurately connect the connector and the fixing part, reducing the overall operation time and improving the efficiency of the operation.

[0016] In one optional embodiment, the distal surface of the locking part is configured as a first inclined surface, which is inclined upward from the distal end to the proximal end; when the locking part moves towards the distal end relative to the fixing member, the distal surface of the positioning part gradually slides relative to the first inclined surface until the two disengage from contact.

[0017] The above technical solution has three aspects: First, due to the design of the first inclined surface, as the locking part moves to the distal end, the distal surface of the positioning part gradually slides relative to the first inclined surface. This gradual sliding process allows the two to smoothly disengage, avoiding the impact and damage that may result from sudden separation. Second, the design of the first inclined surface reduces direct friction between the locking part and the fixing part, lowering the resistance during the separation process and making the separation operation smoother. Third, the design of the first inclined surface simplifies the separation operation of the connecting part and the fixing part; the operator only needs to push the locking part to the distal end to achieve separation, reducing the complexity of the operation.

[0018] In one alternative embodiment, the inclination angle of the first inclined plane is 10° to 80°.

[0019] In one optional embodiment, the proximal surface of the locking part is configured as a second inclined surface, which is inclined upward from the proximal end to the distal end; when the locking part moves towards the proximal end relative to the fixing member, the proximal surface of the positioning part and the second inclined surface gradually slide relative to each other until they disengage.

[0020] The above technical solution has three aspects: First, due to the design of the second inclined surface, as the locking part moves proximally, the proximal surface of the positioning part gradually slides relative to the second inclined surface. This gradual sliding process allows the two parts to smoothly disengage, avoiding the impact and damage that may result from sudden separation. Second, the design of the second inclined surface reduces direct friction between the locking part and the fixing part, lowering the resistance during the separation process and making the separation operation smoother. Third, the design of the second inclined surface simplifies the separation operation of the connecting part and the fixing part; the operator only needs to push the locking part proximally to achieve separation, reducing the complexity of the operation.

[0021] The aforementioned connector has two different ways of separating the fixing part. Both separation methods can ensure the smooth release of the fixing part and the locking part. When one separation method fails, the other separation method can be used, which improves the success rate of separating the fixing part and the locking part. It avoids the situation where the fixing part and the locking part cannot be separated smoothly due to the failure of a certain separation method, and the valve stent cannot be released smoothly, which may endanger the patient's life and health.

[0022] In one alternative embodiment, the inclination angle of the second inclined plane is 10° to 80°.

[0023] In one alternative embodiment, the connector body is provided with a recess having a proximal end face and a distal end face, the recess being located between the distal end of the connector body and the proximal end of the locking part, the recess being adapted to provide accommodating space for the proximal end of the fastener.

[0024] The above technical solution avoids interference between the proximal end of the fastener and the body 11 of the connector, ensuring that their relative positions are not affected. The recessed design allows the proximal end of the fastener to be more tightly embedded, increasing the contact area between the connector and the fastener, thereby enhancing the stability of the connection and preventing the fastener from falling off due to accidental operation.

[0025] In one optional embodiment, the distal end face of the recessed portion transitions seamlessly with the proximal end face of the locking portion, thereby avoiding an abrupt connection at the junction of the distal end face of the recessed portion and the second inclined surface of the locking portion. When the connector and the fixing member need to be separated and the connector is retracted proximally, there will be no significant resistance at the junction of the distal end face of the recessed portion and the second inclined surface of the locking portion, thus making the separation between the connector and the fixing member smoother.

[0026] In one alternative embodiment, the proximal face of the recess and the distal face of the locking portion are inclined in the same direction.

[0027] In the above technical solution, when the connector moves distally, its first inclined surface abuts against the distal surface of the positioning part. At the same time, the proximal surface of the fixing part abuts against the proximal surface of the recessed part, creating a shovel-like effect that facilitates the separation of the fixing part from the connector. This design allows the fixing part to separate from the connector quickly and effectively, improving separation efficiency. The shovel effect reduces resistance during the separation process, making the separation operation of the fixing part and the connector smoother and reducing the risk of damage to surrounding tissues.

[0028] In one optional embodiment, the width ratio of the locking part to the positioning part is 1:3 to 9:10;

[0029] And / or, the ratio of the maximum width of the locking part to the diameter of the connector body does not exceed 1:2.

[0030] Secondly, this utility model also provides a bracket positioning device, comprising:

[0031] casing;

[0032] A connector, wherein the connector is disposed within the sleeve;

[0033] A fastener, the fastener being adapted to be connected to a bracket;

[0034] During the transport of the bracket, the fixing member is connected to the connecting member, and the part of the fixing member connected to the connecting member is inserted into the sleeve and radially constrained by the sleeve. The sleeve and the connecting member move synchronously to transport the fixing member and the bracket together.

[0035] When the support is released, the sleeve retracts and disengages from the connection area between the connector and the fixing member. The fixing member and the connector lose the radial constraint of the sleeve. The locking part of the connector moves relative to the fixing member, and the locking part of the connector separates from the fixing member.

[0036] In the above technical solution, during support transport, the portion connecting the fixing component and the connector is inserted into the sleeve and radially constrained by the sleeve, which can prevent misoperation to a certain extent. During support release, the sleeve retracts and disengages from the connection area between the connector and the fixing component, ensuring smooth separation when the connector and the fixing component move relative to each other.

[0037] During the separation of the connector and the fixing part, the connector can be pushed to the far end or pulled back to the near end. The relative movement design between the locking part of the connector and the fixing part is reasonable, and the operation is simple and convenient, reducing the operation requirements of the operator.

[0038] In one alternative embodiment, the fastener includes:

[0039] A fastener body, the fastener body being adapted to be connected to a bracket;

[0040] At least one fastener protrusion is provided on the fastener body and inserted into the sleeve. The fastener protrusion is provided with a positioning part, and the locking part of the connector is engaged in the positioning part on the fastener.

[0041] In one alternative embodiment, the width of the protrusion of the fastener is greater than the inner diameter of the sleeve.

[0042] In one alternative embodiment, the maximum diameter of the connector does not exceed 7Fr;

[0043] And / or, the ratio of the inner diameter to the wall thickness of the sleeve is not less than 2:1;

[0044] And / or, the surface of the locking portion of the connector is smoothed.

[0045] Thirdly, this utility model also provides a support conveying system, comprising:

[0046] A delivery conduit adapted to radially constrain a stent;

[0047] A stent positioning device is disposed inside a delivery conduit and is adapted to deliver and release a stent.

[0048] The beneficial effects of the aforementioned support conveying system are the same as those of the aforementioned support positioning device, and will not be described in detail here. Attached Figure Description

[0049] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram of the current connection structure between connectors, sleeves, and fasteners.

[0051] Figure 2 A schematic diagram of the structure of a connector provided by this utility model;

[0052] Figure 3 A first-view plan view of a connector provided by this utility model;

[0053] Figure 4 A second-view plan view of a connector provided by this utility model;

[0054] Figure 5 A schematic diagram of the fixing component in the bracket positioning device provided by this utility model;

[0055] Figure 6 This utility model Figure 5 A magnified view of part A;

[0056] Figure 7 A schematic diagram of the connection between the connector and the fixing component in a bracket positioning device provided by this utility model;

[0057] Figure 8 This is a structural diagram of a bracket positioning device provided by this utility model when the sleeve is detached from the connection area between the connector and the fixing component.

[0058] Explanation of reference numerals in the attached figures:

[0059] 1. Connector; 11. Connector body; 12. Locking part; 121. First inclined surface; 122. Second inclined surface; 13. Recessed part; 131. Proximal end face of the recessed part; 132. Distal end face of the recessed part.

[0060] 2. Sleeve;

[0061] 3. Fixing component; 31. Fixing component body; 32. Fixing component protrusion; 33. Positioning part; 331. Positioning part distal end face; 332. Positioning part proximal end face. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0063] Heart valve delivery and replacement devices are used to deliver prosthetic heart valves to a target location, replacing diseased heart valves and restoring heart function. Existing heart valve delivery and replacement devices mainly consist of a delivery device and a prosthetic heart valve. The accurate placement of the prosthetic heart valve in the target area depends on the connection and release mechanism between the delivery device and the prosthetic heart valve.

[0064] Combination Figure 1 As shown, the current conveying device is mainly connected by connector 1, sleeve 2 and fastener 3. The specific connection method is that the sleeve 2 has a through hole on the far side wall, and the fastener 3 is provided with a fastener protrusion 32 with a through hole. The fastener protrusion 32 is fitted into the far end of the fastener so that the through hole of the sleeve 2 is aligned with the through hole of the fastener protrusion 32. Then the connector 1 is inserted through the two through holes to realize the connection between the sleeve 2 and the fastener 3.

[0065] During the release of the heart valve prosthesis, the cannula 2 is fixed in place, the connector 1 is pulled back, and the connection between the cannula 2 and the fixing protrusion 32 is removed. Finally, the cannula 2 is withdrawn to complete the detachment of the delivery cannula from the heart valve stent.

[0066] However, the current delivery device requires the connector 1 to pass through the through hole on the sleeve and the through hole of the fixing part when in use. The inner diameter of these through holes is very small, and only connectors with small diameters can be used for piercing. This makes the piercing operation of the connector extremely demanding, the piercing of the connector difficult, and the installation operation complicated, which affects the assembly efficiency of the sleeve and valve stent fixing parts.

[0067] Based on this, the present invention provides a connector that eliminates the traditional method of setting through holes in the cannula and fixing components. Instead, a locking part is directly provided at the distal end of the connector body, allowing for direct locking and positioning onto the fixing component. This is very simple and convenient, thereby improving the assembly efficiency of the cannula and valve stent fixing component. Furthermore, when the locking part moves relative to the fixing component, it can separate from the fixing component, satisfying the release requirements of the fixing component.

[0068] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "distal" generally refers to the end of the medical implant furthest from the operator; "proximal," the opposite of "distal," refers to the end of the medical implant closer to the operator; and the term "radial" refers to the direction perpendicular to the axis of the medical implant. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0069] The following is combined with Figures 2 to 8The specific embodiments of this utility model are described in detail with reference to the connector of the first aspect of this utility model, the bracket positioning device of the second aspect of this utility model, and the bracket conveying system of the third aspect of this utility model.

[0070] Example 1

[0071] According to an embodiment of the present invention, in a first aspect, a connector is provided, combined with... Figures 2 to 5 As shown, it includes a connector body 11 and a locking part 12. The locking part 12 is located at the distal end of the connector body 11 and is snap-fitted to the fastener 3.

[0072] In this embodiment, when connecting the fastener 3 and the connector, the locking part 12 is directly snapped onto the fastener 3, which simplifies the operation steps of connecting the connector and the fastener 3, reduces the assembly difficulty of the connector and the fastener 3, thereby improving the assembly efficiency of the connector and the fastener 3, and reducing the skill requirements of the operator.

[0073] When the locking part 12 and the fixing part 3 move synchronously, the locking part 12 and the fixing part 3 are positioned and connected to ensure the stability of the conveying of the fixing part 3 and the bracket, and ensure that the fixing part 3 and the bracket can be delivered to the target area smoothly and accurately.

[0074] When the locking part 12 moves relative to the fixing member 3, the locking part 12 separates from the fixing member 3, making the separation operation between the connecting member and the fixing member 3 simpler. The separation of the connecting member and the fixing member 3 can be achieved simply by operating the locking part 12. The movement of the locking part 12 relative to the fixing member 3 is not limited to the form of moving or rotating the locking part 12 relative to the fixing member 3.

[0075] Because the connection and separation process between the connector and the fixing part 3 is simpler, the operation time can be significantly shortened and the operation efficiency can be improved.

[0076] It should be noted that the above-mentioned connectors are not only suitable for heart valve delivery and replacement devices, but also for other medical devices requiring precise connection and separation, demonstrating broad applicability. When applied in the field of medical devices, the connectors can be guidewires or locking wires; when applied in other fields, the connectors can be adjusted in shape and structure according to the specific application scenario.

[0077] In some embodiments, the locking part 12 is snapped into the positioning part 33 on the fixing member 3. The positioning part 33 is a positioning groove or a positioning hole. The positioning part 33 has a proximal end face 332 and a distal end face 331. In this embodiment, when the positioning part 33 is a positioning groove, the positioning groove is a rectangular positioning groove, but it is not limited to a rectangular positioning groove; it can also be a positioning groove of other shapes. When the positioning part 33 is a positioning hole, the positioning hole is a rectangular positioning hole, but it is not limited to a rectangular positioning hole; it can also be a positioning hole of other shapes. In this embodiment, the positioning part 33 is set as a positioning groove or positioning hole with a simple structure, which simplifies the structure while allowing it to be snapped into the locking part 12.

[0078] In some embodiments, when connecting the locking part 12 to the fixing member 3, the locking part 12 extends from the proximal end of the fixing member 3 along its bottom to the distal end, and then is embedded in the positioning part 33 on the fixing member 3. The connection operation is simple and quick, and the operator can quickly and accurately connect the connector to the fixing member 3, reducing the overall operation time and improving the operation efficiency.

[0079] Current stent delivery systems present challenges in deploying valvular stents when they travel through tortuous blood vessels to reach the target area.

[0080] To ensure successful deployment of the valve stent, in some embodiments, combined with Figure 3 As shown, the distal surface of the locking part 12 is configured as a first inclined surface 121, which is inclined upward from the distal end to the proximal end. When the locking part 12 moves towards the distal end relative to the fixing member 3, the distal surface 331 of the positioning part and the first inclined surface 121 gradually slide relative to each other until they disengage.

[0081] In this embodiment, firstly, due to the design of the first inclined surface 121, when the locking part 12 moves to the distal end, the distal end surface 331 of the positioning part gradually slides relative to the first inclined surface 121. This gradual sliding process allows the two to smoothly disengage, avoiding the impact and damage that may result from sudden separation. Secondly, the design of the first inclined surface 121 reduces the direct friction between the locking part 12 and the fixing member 3, reducing the resistance during the separation process and making the separation operation smoother. Thirdly, the design of the first inclined surface 121 simplifies the separation operation of the connector and the fixing member 3. The operator only needs to push the locking part 12 to the distal end to achieve separation, reducing the complexity of the operation.

[0082] The inclination angle of the first inclined surface 121 is between 10° and 80°. Within this angle range, the first inclined surface 121 ensures both the reliability of the connection between the connector and the fixing member 3 when they move synchronously, and the smooth separation of the connector and the fixing member 3 when they move relative to each other. The angle and shape of the first inclined surface 121 can be adjusted according to different surgical needs to adapt to different clinical situations. That is, the first inclined surface 121 can be a straight inclined surface, an arc-shaped inclined surface, or a combination of a straight inclined surface and an arc-shaped inclined surface.

[0083] In some embodiments, combined with Figure 3 As shown, the proximal surface of the locking part 12 is configured as a second inclined surface 122, which is inclined upward from the proximal end to the distal end. When the locking part 12 moves towards the proximal end relative to the fixing member 3, the proximal surface 332 of the positioning part and the second inclined surface 122 gradually slide relative to each other until they disengage.

[0084] In this embodiment, firstly, due to the design of the second inclined surface 122, when the locking part 12 moves towards the proximal end, the proximal end surface 332 of the positioning part gradually slides relative to the second inclined surface 122. This gradual sliding process allows the two to smoothly disengage, avoiding the impact and damage that may result from sudden separation. Secondly, the design of the second inclined surface 122 reduces the direct friction between the locking part 12 and the fixing member 3, reducing the resistance during the separation process and making the separation operation smoother. Thirdly, the design of the second inclined surface 122 simplifies the separation operation of the connector and the fixing member 3. The operator only needs to push the locking part 12 towards the proximal end to achieve separation, reducing the complexity of the operation.

[0085] The inclination angle of the second inclined surface 122 is between 10° and 80°. Within this angle range, the second inclined surface 122 ensures both the reliability of the connection between the connector and the fixing element 3 when they move synchronously, and the smooth separation of the connector and the fixing element 3 when they move relative to each other. The angle and shape of the second inclined surface 122 can be adjusted according to different surgical needs and to adapt to different clinical situations. That is, the second inclined surface 122 can be a straight inclined surface, an arc-shaped inclined surface, or a combination of a straight inclined surface and an arc-shaped inclined surface.

[0086] The connector described above may have only the distal end face of the locking part 12 set as the first inclined surface 121, or only the proximal end face of the locking part 12 set as the second inclined surface 122, or both the distal end face of the locking part 12 set as the first inclined surface 121 and the proximal end face of the locking part 12 set as the second inclined surface 122.

[0087] When the distal end face of the locking part 12 is set as the first inclined surface 121 and the proximal end face of the locking part 12 is set as the second inclined surface 122, the locking part 12 of the above-mentioned connector forms a triangular wedge structure. The above-mentioned connector has two different ways of separating the fixing part 3. Both separation methods can ensure the smooth release of the fixing part 3 and the locking part 12. When one separation method fails, the other separation method can be used, which improves the success rate of separating the fixing part 3 and the locking part 12 and avoids the situation that the fixing part 3 and the locking part 12 cannot be separated smoothly due to the failure of a certain separation method, and the valve stent cannot be released smoothly, endangering the patient's life and health.

[0088] The following provides a detailed explanation of the two methods for separating the fastener 3 from the locking part 12.

[0089] The first method of separating the fastener 3 from the locking part 12 is as follows: (The text abruptly ends here, so the translation stops as well.) Figure 8 As shown, the sleeve 2 is retracted towards the proximal end, causing the sleeve 2 to disengage from the connection area between the connector 1 and the fixing member 3. The connector 1 is pushed towards the distal end, and the first inclined surface 121 of the locking part 12 at the distal end of the connector 1 slides towards the distal end along the positioning hole or positioning groove protruding in the fixing member until the first inclined surface 121 of the locking part 12 gradually separates from the distal end surface of the positioning hole or positioning groove, thus automatically achieving separation.

[0090] The second method of separating the fastener 3 from the locking part 12 is as follows: (The text abruptly ends here, so the translation stops as well.) Figure 8 As shown, the sleeve 2 is retracted towards the proximal end, causing the sleeve 2 to disengage from the connection area between the connector 1 and the fixing member 3. The connector 1 is retracted, causing it to move towards the proximal end. The second inclined surface 122 of the locking part 12 of the connector 1 will slide towards the proximal end along the positioning hole or positioning groove protruding from the fixing member until the second inclined surface 122 of the locking part 12 gradually separates from the proximal end face of the positioning hole or positioning groove, achieving automatic separation.

[0091] In some embodiments, the connector body 11 is provided with a recess 13, which has a proximal end face 131 and a distal end face 132. The recess 13 is located between the distal end of the connector body 11 and the proximal end of the locking part 12. The recess 13 is adapted to provide accommodating space for the proximal end of the fastener 3, avoiding interference between the proximal end of the fastener 3 and the connector body 11, and ensuring that their relative positions are not affected. The design of the recess 13 allows the proximal end of the fastener 3 to be more tightly embedded therein, increasing the contact area between the connector and the fastener 3, thereby enhancing the stability of the connection and preventing the fastener 3 from falling off due to accidental operation.

[0092] In some embodiments, the distal end face 132 of the recessed portion and the proximal end face of the locking portion 12 are seamlessly connected, thereby avoiding the problem of abrupt connection at the junction of the distal end face 132 of the recessed portion and the second inclined surface 122 of the locking portion 12. When the connector and the fixing member 3 need to be separated and the connector is retracted proximally, there will be no significant resistance at the junction of the distal end face 132 of the recessed portion and the second inclined surface 122 of the locking portion 12, thus making the separation between the connector and the fixing member 3 smoother.

[0093] In some embodiments, combined with Figure 3 As shown, the proximal end face 131 of the recess and the distal end face of the locking part 12 are inclined in the same direction, that is, the proximal end face 131 of the recess is set as a third inclined surface 131. In this embodiment, when the fixing member protrusion 32 separates from the locking part 12, the connecting member 1 is pushed distally. The inclined proximal end face 131 of the recess can reduce the obstruction effect on the fixing member protrusion 32 and produce a shovel-like effect, causing the fixing member 3 to separate from the connecting member.

[0094] It should be noted that, taking the fastener 3 being snapped onto the top of the locking part 12 as an example, "inclined in the same direction" in this embodiment means that the first inclined surface 121 of the locking part 12 is inclined upward from the far end to the near end, and the near end surface 131 of the recessed part is also inclined upward from the far end to the near end. Here, the inclination angles of the near end surface 131 of the recessed part and the far end surface of the locking part 12 can be the same or different.

[0095] The distance between the proximal end face 131 of the recess and the distal end face (i.e., the first inclined surface 121) of the locking part 12 is the same as the distance between the distal end face 331 of the positioning part and the proximal end face of the fixing member 3. Taking the fixing member 3 being snapped onto the top of the locking part 12 as an example, when the connector moves distally, the first inclined surface 121 of the connector abuts against the distal end face 331 of the positioning part. At this time, the proximal end face of the fixing member 3 abuts against the proximal end face 131 of the recess, creating a shovel-like effect that promotes the separation of the fixing member 3 from the connector. This design allows the fixing member 3 to separate from the connector quickly and effectively, improving separation efficiency. The shovel effect reduces resistance during the separation process, making the separation operation of the fixing member 3 from the connector smoother and reducing the risk of damage to surrounding tissues.

[0096] On the other hand, when the connector and the fixing member 3 move synchronously, that is, when the connector and the fixing member 3 do not need to be separated, the first inclined surface 121 of the connector abuts against the far end surface 331 of the positioning part, and at the same time, the near end surface of the fixing member 3 abuts against the near end surface 131 of the recessed part, forming a double abutment, which reduces the loosening of the fixing member 3 in the connected state and ensures the firmness and reliability of the connection.

[0097] In some embodiments, the width ratio of the locking part 12 to the positioning part 33 is 1:3 to 9:10. Within this ratio range, it is possible to ensure both the reliability of the connection between the connector and the fixing part 3 when they move synchronously, and the smooth separation of the connector and the fixing part 3 when they move relative to the fixing part 3.

[0098] In some embodiments, combined with Figure 4 As shown, the ratio of the maximum width of the locking part 12 to the diameter of the connecting body 11 does not exceed 1:2, so that the locking part 12 is neither too wide nor too narrow, and the width of the locking part 12 is moderate, so that the fastener protrusion 32 that is adapted to the locking part 12 is not too wide.

[0099] Example 2

[0100] According to an embodiment of the present invention, in a second aspect, a bracket positioning device is provided, combined with... Figures 2 to 8 As shown, the device includes a sleeve 2, a connector 1, and a fixing member 3. The fixing member 3 is adapted to connect with a bracket. The connector 1 is disposed inside the sleeve 2, and the connector 1 and the sleeve 2 are coupled or separated. Coupling means that the connector 1 and the sleeve 2 are connected together and can move synchronously. Separation means that the connector 1 and the sleeve 2 are separate. More specifically, the coupling or separation of the connector 1 and the sleeve 2 can be achieved by an operating handle located near the proximal end of the sleeve, or by setting magnetic blocks near the proximal ends of the connector 1 and the sleeve 2 respectively, and achieving coupling and separation through the magnetic blocks between them.

[0101] In this embodiment, the coupling and separation between the connector 1 and the sleeve 2 are achieved by operating the handle or magnetic block, ensuring precise control during the delivery and release of the support.

[0102] During the transport of the support, the fixing part 3 is connected to the connecting part 1, and the part of the fixing part 3 connected to the connecting part 1 is inserted into the sleeve 2 and radially constrained by the sleeve 2. At this time, when the sleeve 2 moves to the far end, it can push the fixing part 3 and the connecting part 1 to move to the far end synchronously. At this time, the sleeve 2 can also be coupled with the connecting part 1 (i.e., the two move synchronously) to jointly transport the fixing part 3 and the support, ensuring stable transport of the support.

[0103] When the stent is released, the sleeve 2 and the connector 1 separate (i.e., they can move independently). The sleeve 2 retracts and disengages from the connection area between the connector 1 and the fixing member 3. The part of the fixing member 3 connected to the connector 1 loses the radial constraint of the sleeve 2 (i.e., the part of the fixing member 3 connected to the connector 1 is no longer in close contact with the sleeve 2). The locking part 12 of the connector 1 moves relative to the fixing member 3. Since the outside of the locking part 12 of the connector 1 is no longer subject to constraint, the locking part 12 of the connector 1 and the fixing member 3 can be separated.

[0104] Conversely, if, during stent release, the sleeve 2 is not first retracted from the connection area between the connector 1 and the fixing member 3, and the connector 1 is moved relative to the fixing member 3 directly, the radial constraint of the sleeve 2 on the part connecting the fixing member 3 and the connector 1 will prevent the connector 1 and the fixing member 3 from separating smoothly. Therefore, during stent transport, the part connecting the fixing member 3 and the connector 1 is inserted into the sleeve 2, and the sleeve 2 provides radial constraint, which can prevent misoperation to a certain extent. During stent release, the sleeve 2 is retracted from the connection area between the connector 1 and the fixing member 3, ensuring that the connector 1 and the fixing member 3 can separate smoothly when moving relative to each other.

[0105] During the separation process of connector 1 and fixing part 3, connector 1 can be pushed to the far end or pulled back to the near end. The relative movement design between locking part 12 of connector 1 and fixing part 3 is reasonable, and the operation is simple and convenient, reducing the operation requirements of the operator.

[0106] In some embodiments, the fastener 3 includes a fastener body 31 and a fastener protrusion 32. The fastener body 31 is adapted to connect with the bracket. At least one fastener protrusion 32 is provided, which is disposed on the fastener body 31 and inserted into the sleeve 2. The fastener protrusion 32 is provided with a positioning part 33, and the locking part 12 of the connector 1 is engaged in the positioning part 33 on the fastener 3. In this embodiment, the entire bracket can be transported through the connection between the fastener protrusion 32 and the locking part 12 of the connector 1.

[0107] In some embodiments, the width of the fastener protrusion 32 is greater than the inner diameter of the sleeve 2, so that when the fastener protrusion 32 is inserted into the sleeve 2, the fastener protrusion 32 can be radially constrained by the sleeve 2, and the fastener protrusion 32 and the sleeve 2 are in close contact. More specifically, the fastener protrusion 32 is a square protrusion, but the fastener protrusion 32 may also be other shapes.

[0108] In some embodiments, combined with Figure 5 As shown, there are three fastener protrusions 32 with an included angle of 120° between them. The sleeve 2 and the connector 1 are also provided with three protrusions. This evenly distributed design ensures that each fastener protrusion 32 can provide a stable support point, thus ensuring the balance and stability of the fastener 3 during the conveying and releasing process.

[0109] In some embodiments, the connector 1 is made of a highly biocompatible material; more specifically, the connector is a cylindrical nickel-titanium wire. Nickel-titanium wire is a highly biocompatible material that can significantly reduce the body's immune response to the implant, lower the risk of inflammation and rejection, and reduce damage to human tissues.

[0110] In some embodiments, the maximum diameter of connector 1 does not exceed 7 Fr, enabling connector 1 to adapt to smaller blood vessels and be suitable for stent delivery in various types of blood vessels. The smaller diameter of connector 1 reduces friction and damage to the blood vessel wall.

[0111] In some embodiments, the cannula 2 is made of a biocompatible material. More specifically, the cannula 2 is a circular, porous polymer tube with good biocompatibility and high flexibility, which allows the cannula 2 to adapt to complex vascular pathways.

[0112] In some embodiments, the ratio of the inner diameter to the wall thickness of the sleeve 2 is not less than 2:1, which makes the inner cavity of the sleeve 2 larger and the wall of the sleeve 2 thinner, thereby enabling the sleeve 2 to accommodate a larger outer diameter of the connector and improving flexibility.

[0113] In some embodiments, the surface of the locking portion 12 of the connector 1 is smoothed to reduce damage to human tissues and blood vessels.

[0114] The aforementioned bracket positioning device has a triangular barb structure designed at the far end of the connector 1. The far end of the connector 1 is spindle-shaped. The triangular barb structure is embedded in the square positioning hole or square positioning groove of the fixing member protrusion 32 and is combined with the sleeve to complete the overall connection.

[0115] When connecting the valve stent to the stent positioning device, connector 1 is inside the cannula 2, with the distal end of connector 1 extending beyond the distal end of the cannula 2. The locking parts 12 (triangular inserts) at the distal ends of the three connectors are respectively embedded into the square positioning holes or positioning grooves of the fixing protrusions, ensuring a tight fit between the locking parts 12 of connector 1 and the positioning holes or positioning grooves of the fixing protrusions. Pulling connector 1 back proximally causes it to move the fixing protrusions proximally, pulling them into the distal end of the cannula 2 until the distal end of the cannula 2 is in contact with the bottom of the fixing protrusions. The constraint of the cannula 2's inner cavity ensures a tight connection between connector 1 and the fixing protrusions 32. The other two fixing parts 3 are connected in the same manner, completing the connection between the valve stent and the stent positioning device.

[0116] The first method for separating the fixator 3 and the valve stent from the connector: The stent delivery system loads the valve stent and travels through the tortuous blood vessels to the target area. After the fixator 3 is positioned (i.e., the fixator 3 is fixed to the position of the blood vessel), when releasing the valve stent, the cannula 2 is retracted proximally, causing the cannula 2 to detach from the connection area between the connector 1 and the fixator 3. The connector 1 is moved distally, and the first inclined surface 121 of the distal locking part 12 of the connector 1 slides distally along the positioning hole or positioning groove of the fixator until the first inclined surface 121 of the locking part 12 gradually separates from the distal end surface of the positioning hole or positioning groove, automatically achieving separation. At the same time, the third inclined surface 131 on the recessed part of the connector contacts the distal end surface of the protrusion of the fixator, acting like a shovel to promote the separation of the protrusion 32 of the fixator from the connector 1, completing the separation of the connector 1 from the protrusion 32 of the fixator. The connector 1 and the cannula 2 are retracted proximally, realizing the release of the fixator 3 and the valve stent.

[0117] A second method for separating the fixator 3 and the valve stent from the connector: When the first separation method fails, the second separation method can be used. The stent delivery system, loaded with the valve stent, travels through the tortuous blood vessels to the target area. After the fixator 3 completes its positioning (i.e., the fixator 3 is fixed to the position of the blood vessel), when releasing the valve stent, the cannula 2 is retracted proximally, causing the cannula 2 to detach from the connection area between the connector 1 and the fixator 3. The connector 1 is retracted, causing it to move proximally. The second inclined surface 122 of the locking part 12 (triangular insert) of the connector 1 slides proximally along the positioning hole or positioning groove of the fixator protrusion until the second inclined surface 122 of the locking part 12 gradually separates from the proximal surface of the positioning hole or positioning groove, achieving automatic separation and completing the separation of the connector 1 from the fixator protrusion 32. The connector 1 and cannula 2 are retracted proximally, releasing the fixator 3 and the valve stent.

[0118] Example 3

[0119] According to an embodiment of the present invention, in a third aspect, a stent delivery system is provided, including a delivery catheter and a stent positioning device. The stent positioning device is disposed within the delivery catheter and is adapted to deliver and release a valvular stent. The valvular stent is a self-expanding stent, and the delivery catheter is adapted to radially constrain the valvular stent. The delivery catheter is used to deliver the valvular stent and the stent positioning device. After the delivery catheter moves the stent and the stent positioning device to the vicinity of the target position, the stent is delivered through the stent positioning device, causing the stent to extend from the delivery catheter and move to the target area. Then, the delivery catheter is retracted proximally, moving it a certain distance so that the valvular stent is fully exposed, and the stent self-expands and is fixed at the target position. Then, the stent positioning device is operated to disengage from the fixing member 3 on the valvular stent, thereby releasing the valvular stent. Finally, the delivery catheter and the stent positioning device are retracted.

[0120] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A connection, characterized in that The connecting member body (11) comprises: a locking portion (12) arranged at the distal end of the connecting member body (11), the locking portion (12) being snap-connected with the fixing member (3); when the locking portion (12) moves synchronously with the fixing member (3), the locking portion (12) is positioned and connected with the fixing member (3); when the locking portion (12) moves relative to the fixing member (3), the locking portion (12) is separated from the fixing member (3). The locking portion (12) is snap-connected in a positioning portion (33) arranged on the fixing member (3), and the positioning portion (33) is a positioning groove or a positioning hole.

2. The connection of claim 1, wherein When the locking portion (12) is connected with the fixing member (3), the locking portion (12) extends from the proximal end of the fixing member (3) to the distal end along the bottom thereof, and then is embedded in the positioning portion (33) on the fixing member (3).

3. The connection of claim 2, wherein The distal end surface of the locking portion (12) is provided as a first inclined surface (121) which is arranged upwardly inclined from the distal end to the proximal end; when the locking portion (12) moves distally relative to the fixing member (3), the distal end surface of the positioning portion (33) gradually slides relative to the first inclined surface (121) until the two are out of contact.

4. The connection of claim 3, wherein The inclination angle of the first inclined surface (121) is 10°-80°.

5. The connection of claim 4, wherein The proximal end surface of the locking portion (12) is provided as a second inclined surface (122) which is arranged upwardly inclined from the proximal end to the distal end; when the locking portion (12) moves proximally relative to the fixing member (3), the proximal end surface of the positioning portion (33) gradually slides relative to the second inclined surface (122) until the two are out of contact.

6. The connection of claim 3, wherein The inclination angle of the second inclined surface (122) is 10°-80°.

7. The connection of claim 6, wherein The connecting member body (11) is provided with a recessed portion (13) having a recessed portion proximal end surface (131) and a recessed portion distal end surface (132), the recessed portion (13) being located between the distal end of the connecting member body (11) and the proximal end of the locking portion (12), and the recessed portion (13) is adapted to provide a containing space for the proximal end portion of the fixing member (3).

8. The connection of any one of claims 1-7, wherein, The recessed portion proximal end surface (131) and the distal end surface of the locking portion (12) are inclined in the same direction.

9. The connection of claim 8, wherein, The recessed portion distal end surface (132) and the proximal end surface of the locking portion (12) are in transition connection.

10. The connection of claim 8, wherein The width ratio of the locking portion (12) to the positioning portion (33) is 1:3-9:10; 11. The connection of any of claims 2-7, wherein, And / or, the maximum width of the locking portion (12) to the diameter of the connecting member body (11) is not more than 1:

2. The connecting member (1) of any one of claims 1-11 is arranged in the sleeve (2).

12. A stent positioning device, characterized by, The connecting member (1) of any one of claims 1-11 is arranged in the sleeve (2). The fixing member (3) is adapted to be connected with a stent. ​ ​ In the process of stent delivery, the fixing member (3) is connected with the connecting member (1), and the part of the fixing member (3) connected with the connecting member (1) is inserted into the sleeve (2) and is radially constrained by the sleeve (2), the sleeve (2) and the connecting member (1) move synchronously, and the fixing member (3) and the stent are delivered together; In the process of stent release, the sleeve (2) withdraws from the connecting area of the connecting member (1) and the fixing member (3), the part of the fixing member (3) connected with the connecting member (1) loses the radial constraint of the sleeve (2), the locking part (12) of the connecting member (1) moves relative to the fixing member (3), and the locking part (12) of the connecting member (1) is separated from the fixing member (3).

13. The stent positioning device of claim 12, wherein, The fixing member (3) comprises: A fixing member body (31) adapted to be connected with the stent; At least one fixing member protrusion (32) provided on the fixing member body (31) and inserted into the sleeve (2), wherein a positioning part (33) is provided on the fixing member protrusion (32), and the locking part (12) of the connecting member (1) is clamped and arranged in the positioning part (33) on the fixing member (3).

14. The stent positioning device of claim 13, wherein, The width of the fixing member protrusion (32) is greater than the inner diameter of the sleeve (2).

15. The stent positioning device of any of claims 12-14, wherein, The maximum diameter of the connecting member (1) is not more than 7Fr; And / or, the ratio of the inner diameter to the wall thickness of the sleeve (2) is not less than 2:1; And / or, the surface of the locking part (12) of the connecting member (1) is smooth.

16. A stent delivery system characterized by, Comprise: A delivery catheter adapted to radially constrain the stent; The stent positioning device according to any one of claims 12-15, which is arranged in the delivery catheter and is adapted to deliver and release the stent.

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