Unlocking assembly

Abstract

The unlocking assembly comprises a control pipe and an unlocking structure, the unlocking structure comprises an unlocking pipe and a traction strip which are connected with each other, the unlocking pipe comprises a spring pipe, a limiting pipe and a connecting strip, the spring pipe and the limiting pipe are coaxially arranged, and an adjusting space is reserved between the spring pipe and the limiting pipe; the far end of the connecting strip is connected with the far end of the spring tube, the near end of the connecting strip is connected with the limiting tube, the far end of the traction strip is connected with the near end of the spring tube, and the near end of the traction strip is connected with the far end of the control tube. When the valve support is released, it can be ensured that the whole unlocking pipe moves towards the near end side, the connecting position of the hanging lug and the hanging head can be exposed, and it is ensured that the valve support can be successfully released.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to an unlocking component. Background Art

[0002] The prior art CN113855330A discloses a structure for quickly connecting and releasing a heart valve stent, which discloses a spring-type unlocking sleeve. The unlocking sleeve can be telescoped in its axial direction. When connecting the lugs to the hanging heads on the valve stent, the unlocking sleeve can be compressed in the proximal direction so that the lugs are exposed from the distal end of the unlocking sleeve, thus facilitating the connection between the hanging heads and the lugs. After the connection is completed, the unlocking sleeve is released, and the length of the unlocking sleeve becomes longer. The distal end of the unlocking sleeve moves towards the side of the hanging head, so that the head end of the lug and the hanging head enter the unlocking sleeve, thereby preventing the lugs from detaching from the hanging heads. When the valve stent needs to be released, at this time, the unlocking sleeve is pulled towards the proximal side. Due to the existence of resistance, the proximal end of the unlocking sleeve moves towards the proximal side, while the position of the distal end of the unlocking sleeve remains basically unchanged, so that the length of the unlocking sleeve is stretched, and the connection position between the lugs and the hanging heads is located inside the distal end portion of the unlocking sleeve, so that this connection position cannot be exposed, resulting in the failure of releasing the heart valve and affecting the progress of the interventional operation. Summary of the Utility Model

[0003] In view of this, the utility model provides an unlocking component, which is applied to a heart valve delivery system. When releasing the valve stent, it can ensure that the whole unlocking tube moves towards the proximal side, so that the connection position between the lugs and the hanging heads can be exposed, ensuring the successful release of the valve stent.

[0004] The technical solution adopted by the utility model is as follows:

[0005] An unlocking component is applied to a heart valve delivery system and includes a control tube and an unlocking structure. The unlocking structure includes an unlocking tube and a traction strip connected to each other. The unlocking tube includes a spring tube, a limiting tube and a connecting strip. The spring tube and the limiting tube are coaxially arranged, and there is an adjustment space between them. The distal end of the connecting strip is connected to the distal end portion of the spring tube, the proximal end of the connecting strip is connected to the limiting tube, the distal end of the traction strip is connected to the proximal end of the spring tube, and the proximal end of the traction strip is connected to the distal end of the control tube.

[0006] Preferably, the spring tube includes an auxiliary portion and a spring portion connected to each other. The auxiliary portion is located at the distal end of the spring portion. The auxiliary portion is a tubular structure, and the distal end of the connecting strip is connected to the auxiliary portion.

[0007] Preferably, the spring portion includes a first tube section, a spring section and a second tube section connected in sequence. The first tube section is connected to the auxiliary portion, and the distal end of the traction strip is connected to the second tube section.

[0008] Preferably, in the natural state of the unlocking tube, the ratio of the length of the spring section to the length of the adjustment space is greater than 3, and the length of the adjustment space is not greater than 5 mm.

[0009] Preferably, the inner diameters of the auxiliary part, the first pipe section, the second pipe section, and the limiting pipe are equal, and the outer diameters of the auxiliary part, the first pipe section, the second pipe section, and the limiting pipe are equal;

[0010] In the natural state, the inner diameter of the spring section is equal to the inner diameter of the first pipe section, and the outer diameter of the spring section is equal to the outer diameter of the first pipe section.

[0011] Preferably, a first connection point is provided at one end of the auxiliary part close to the limiting pipe, and the first connection point is located on the outer peripheral surface of the auxiliary part; a second connection point is provided at one end of the limiting pipe close to the auxiliary part, and the second connection point is located on the outer peripheral surface of the limiting pipe; in the circumferential direction of the auxiliary part, the first connection point and the second connection point are located at the same position, one end of the connecting strip is connected to the first connection point, and the other end of the connecting pipe is connected to the second connection point;

[0012] The connecting strip includes a first inclined section, a straight section, and a second inclined section connected in sequence, and the straight section is parallel to the axis of the auxiliary part;

[0013] In the direction from the auxiliary part towards the limiting pipe, the first inclined section inclines towards the radially outer side of the auxiliary part, and the second inclined section inclines towards the radially inner side of the auxiliary part.

[0014] Preferably, the number of the unlocking structures is multiple, and in the circumferential direction of the control pipe, the multiple unlocking structures are arranged at equal intervals.

[0015] The beneficial effects of the present utility model:

[0016] In the present utility model, the unlocking sleeve in the prior art is replaced with an unlocking tube. The traction strip has a certain rigidity and is connected to the proximal end of the spring tube. When applied to a heart valve delivery system, the hanging ear is inserted into the spring tube, and in the natural state, the distal end of the hanging ear is located inside the distal end portion of the spring tube. When assembling the heart valve delivery system, it is necessary to connect the hanging ear to the hanging head on the valve stent. At this time, manually compress the distal end portion of the spring tube, causing the distal end of the spring tube to move towards the proximal side. Since the traction strip has a certain rigidity, the traction strip presses against the proximal end of the spring tube, preventing the proximal end of the spring tube from moving towards the proximal side. This compresses the spring tube and causes the distal end of the hanging ear to expose from the distal end portion of the spring tube, facilitating the connection between the hanging ear and the hanging head. After the connection between the hanging ear and the hanging head is completed, release the spring tube. The spring tube is no longer compressed and extends under the action of its own elastic force, causing the distal ends of the hanging head and the hanging ear to enter the distal end portion of the spring tube, thereby preventing the hanging head from detaching from the hanging ear.

[0017] When it is necessary to release the valve stent, pull the traction strip towards the proximal side. The traction strip pulls the proximal end of the spring tube, causing the proximal end of the spring tube to move towards the proximal side. Even when the distal end portion of the spring tube cannot move towards the proximal side due to the existence of resistance, this causes the spring tube to be stretched until the proximal end of the spring tube contacts the limiting tube. Since the limiting tube and the distal end portion of the spring tube are connected by a rigid connecting strip, continuously pulling the spring tube towards the proximal side will cause the spring tube to push the limiting tube towards the proximal side, and further cause the distal end portion of the spring tube to also move towards the proximal side, so that the connection position between the hanging ear and the hanging head can be exposed, enabling the valves to be successfully released and ensuring the smooth progress of the interventional operation. Brief Description of the Drawings

[0018] Through the following description of the embodiments of the present utility model with reference to the accompanying drawings, the above and other objects, features, and advantages of the present utility model will become clearer. In the drawings:

[0019] Figure 1 is a schematic structural diagram of the unlocking assembly;

[0020] Figure 2 is a schematic structural diagram of the unlocking structure;

[0021] Figure 3 is a schematic structural diagram of the heart valve delivery system;

[0022] Figure 4 is a schematic structural diagram of the inner tube device;

[0023] Figure 5 is a schematic diagram of the cooperation of the unlocking structure, the hanging ear, and the hanging head Figure 1 ;

[0024] Figure 6 is a schematic diagram of the cooperation of the unlocking structure, the hanging ear, and the hanging headFigure 2 ;

[0025] Figure 7 It is a schematic diagram of the cooperation among the unlocking structure, the hanging ear, and the hanging head Figure 3 ;

[0026] Figure 8 It is a schematic diagram of the cooperation among the unlocking structure, the hanging ear, and the hanging head Figure 4 ;

[0027] Figure 9 It is a schematic diagram of the cooperation among the unlocking structure, the hanging ear, and the hanging head Figure 5 ;

[0028] Figure 10 It is a schematic diagram of the cooperation among the unlocking structure, the hanging ear, and the hanging head Figure 6 .

[0029] In the figure: 1. Unlocking component; 2. Outer sheath tube; 3. Inner tube device; 4. Valve stent;

[0030] 11. Control tube; 12. Traction strip; 13. Unlocking tube; 14. Spring tube; 15. Spring part; 16. Fiber tube; 17. Connection strip; 18. Adjustment space;

[0031] 31. Inner tube; 32. Hanging ear;

[0032] 41. Hanging head;

[0033] 141. Auxiliary part;

[0034] 151. First pipe section; 152. Second pipe section; 153. Spring section. Detailed implementation mode

[0035] The following describes the present utility model based on embodiments, but the present utility model is not limited to these embodiments. In the following detailed description of the present utility model, some specific details are described in detail. In order to avoid obscuring the essence of the present utility model, well-known methods, processes, procedures, and components are not described in detail.

[0036] In addition, those of ordinary skill in the art should understand that the drawings provided herein are for illustrative purposes only, and the drawings are not necessarily drawn to scale.

[0037] Unless the context clearly requires otherwise, the words "including", "comprising", and similar words throughout the specification and claims should be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".

[0038] In the description of the present utility model, it should be understood that terms such as "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the present utility model, during an interventional operation, "proximal" refers to the side closer to the operator, and "distal" refers to the side closer to the ventricle.

[0040] See Figures 1 - 10 , the present utility model provides an unlocking assembly, which is applied to a heart valve delivery system and includes a control tube 11 and an unlocking structure. The unlocking structure includes an unlocking tube 13 and a traction strip 12 that are connected to each other. The unlocking tube 13 includes a spring tube 14, a limiting tube 16, and a connecting strip 17. The spring tube 14 and the limiting tube 16 are coaxially arranged, and there is an adjustment space 18 between them. The distal end of the connecting strip 17 is connected to the distal end portion of the spring tube 14, the proximal end of the connecting strip 17 is connected to the limiting tube 16, the distal end of the traction strip 12 is connected to the proximal end of the spring tube 14, and the proximal end of the traction strip 12 is connected to the distal end of the control tube 11.

[0041] For ease of understanding, the present utility model is described by taking its application to a heart valve delivery system as an example.

[0042] The heart valve delivery system includes an outer sheath tube 2, an unlocking assembly 1, an inner tube device 33, and a valve stent 44.

[0043] The inner tube device 3 includes an inner tube 31 and a plurality of lugs 32. The number of lugs 32 is equal to and corresponds one by one to the number of unlocking structures. The plurality of lugs 32 are connected to the distal end of the inner tube 31. In the circumferential direction of the inner tube 31, the plurality of lugs 32 are arranged at equal angles. The inner tube 31 is located inside the control tube 11, and the lugs 32 pass through the limiting tube 16 and the spring tube 14 of the corresponding unlocking structure.

[0044] The valve stent 4 includes a stent and a valve. The valve is laid on the stent. One end of the stent is provided with a plurality of hanging heads 41. The number of hanging heads 41 is equal to and corresponds one by one to the number of lugs 32. The corresponding lugs 32 and hanging heads 41 are connected.

[0045] The control tube 11 is sleeved inside the outer sheath tube 2.

[0046] See Figure 2, the connecting strip 17 has a certain rigidity. The distal end of the spring tube 14 is connected to the limiting tube 16 through the connecting strip 17, and the connecting strip 17 is strip-shaped, so that the relative positions of the distal end of the spring tube 14 and the limiting tube 16 are basically kept unchanged; in the natural state, the proximal end of the spring tube 14 is suspended, so that an adjustment space 18 is formed between the proximal end of the spring tube 14 and the limiting tube 16; the spring tube 14 has elastic ability (similar to a spring), and in the axial direction of the spring tube 14, the spring tube 14 can be compressed or elongated, so as to change the length of the spring tube 14.

[0047] Both the spring tube 14 and the limiting tube 16 are tubular structures, so that the hanging ear 32 can pass through the unlocking tube 13.

[0048] The purpose of the present utility model is to solve how the hanging ear 32 and the hanging head 41 can be normally separated when the valve stent 4 is released.

[0049] In the present utility model, the control tube 11 is a metal tube, and a plurality of unlocking structures are connected to the distal end of the control tube 11. For the convenience of understanding, one of the unlocking structures is taken as an example for description. The unlocking structure includes an unlocking tube 13 and a traction strip 12. The distal end of the traction strip 12 is connected to the proximal end of the spring tube 14, and the proximal end of the traction strip 12 is connected to the distal end of the control tube 11. The traction strip 12 is a metal strip and has a certain rigidity. That is to say, in the normal use scenario, the traction strip 12 basically does not bend (or the bending degree is small), so that the relative positions of the distal end of the control tube 11 and the proximal end of the spring tube 14 are basically kept unchanged.

[0050] The inner tube 31 is sleeved in the control tube 11. The proximal end of the hanging ear 32 is connected to the distal end of the inner tube 31. The hanging ear 32 is strip-shaped as a whole, and the hanging ear 32 can pass through the limiting tube 16 and the spring tube 14, so that the distal end of the hanging ear 32 is located inside the distal end of the spring tube 14 (when the spring tube 14 is in the natural state).

[0051] In the natural state, the distal end of the hanging ear 32 is located inside the distal end of the spring tube 14 (the auxiliary part 141 described below). When it is necessary to connect the hanging ear 32 with the hanging head 41 on the valve stent 4, the distal end of the hanging ear 32 needs to be exposed. At this time, manually press the auxiliary part 141 towards the proximal side, as Figure 5In the illustrated embodiment, the auxiliary part 141 is pushed to the right, causing the auxiliary part 141 to move to the right. Since the limiting tube 16 is connected to the auxiliary part 141 by the connecting bar 17, the position of the limiting tube 16 relative to the auxiliary part 141 remains unchanged. Thus, the limiting tube 16 also moves to the right synchronously. The right end (proximal end) of the spring tube 14 is connected to the traction bar 12. The traction bar 12 has a certain rigidity, that is, the traction bar 12 will hinder the rightward movement of the right end of the spring tube 14. This causes the spring tube 14 to be compressed, increasing the length of the adjustment space 18. Since the auxiliary part 141 moves to the right while the position of the hanging ear 32 remains unchanged, the distal end (left end) of the hanging ear 32 is exposed from the auxiliary part 141( Figure 6 shown), facilitating the connection of the distal end of the hanging ear 32 to the hanging head 41.

[0052] After the hanging ear 32 is connected to the hanging head 41( Figure 7 shown), the auxiliary part 141 (spring tube 14) is released. Since the spring tube 14 is compressed and the position of the right end (proximal end) of the spring tube 14 is limited by the traction bar 12, the left end (distal end) of the spring tube 14 moves to the left, causing the auxiliary part 141 and the limiting tube 16 to move to the left simultaneously. As a result, the distal end of the hanging ear 32 re-enters the auxiliary part 141. Since the hanging ear 32 is connected to the hanging head 41, the connection position of the two is located within the auxiliary part 141( Figure 8 shown). Due to the limitation of the auxiliary part 141, the hanging head 41 and the hanging ear 32 will not become loose.

[0053] During an interventional operation, when the valve stent 4 is delivered to the aortic valve, the valve stent 4 needs to be released to replace the failed native valve. When releasing the aortic valve, the control tube 11 is pulled to the proximal side (to the right), and the inner tube 31 remains stationary. Since the control tube 11 moves to the right, it drives the traction bar 12 to move to the right. The distal end of the traction bar 12 is connected to the proximal end of the spring tube 14, causing the proximal end of the spring tube 14 to move to the right. In most cases, the entire spring tube 14 moves to the right, further causing the auxiliary part 141 to move to the right (i.e., the entire unlocking tube 13 moves to the right). As a result, the connection position between the hanging ear 32 and the hanging head 41 is exposed from the auxiliary part 141, enabling the hanging ear 32 and the hanging head 41 to become loose, thus achieving the purpose of releasing the valve stent 4.

[0054] In some cases, the bourdon tube 14 is subject to a certain external resistance, such that when pulling the right end of the bourdon tube 14 to the right, the bourdon tube 14 does not move as a whole to the right; instead, the bourdon tube 14 will be stretched. At this time, the position of the left end of the bourdon tube 14 remains unchanged, so that the connection position between the hanging ear 32 and the hanging head 41 cannot expose the auxiliary part 141; in this case, when pulling the traction strip 12 to the right, the traction strip 12 pulls the right end of the bourdon tube 14 to move to the right, the bourdon tube 14 is stretched, and at the same time the right end of the bourdon tube 14 moves towards the limiting tube 16, making the length of the adjustment space 18 shorter until the right end of the bourdon tube 14 contacts the limiting tube 16( Figure 9 as shown), when continuing to pull the traction strip 12 to the right, the bourdon tube 14 will push against the limiting tube 16 and move to the right, and the limiting tube 16 is connected to the auxiliary part 141 through the connecting strip 17, so that the auxiliary part 141 also moves to the right, ensuring that the connection position between the hanging ear 32 and the hanging head 41 can be normally exposed( Figure 10 as shown), ensuring that the valve stent 4 can be successfully released and ensuring the normal progress of the interventional operation.

[0055] The bourdon tube 14 includes an auxiliary part 141 and a spring part 15 connected to each other (for example, by welding). The auxiliary part 141 is located at the distal end of the spring part 15. The auxiliary part 141 is a tubular structure, and the distal end of the connecting strip 17 is connected to the auxiliary part 141.

[0056] The function of the auxiliary part 141 has been described above and will not be elaborated here.

[0057] The spring part 15 includes a first pipe section 151, a spring section 153, and a second pipe section 152 connected in sequence. The first pipe section 151 is connected to the auxiliary part 141, and the distal end of the traction strip 12 is connected to the second pipe section 152.

[0058] Among them, the first pipe section 151 cannot be compressed and deformed, so that the first pipe section 151 can be conveniently connected to the auxiliary part 141 (welding can be used), so that the auxiliary part 141 can be connected to the spring part 15; the setting of the second pipe section 152 facilitates the connection with the traction strip 12, so that the traction strip 12 can be connected to the bourdon tube 14. The setting of the spring section 153 enables the bourdon tube 14 to expand and contract and provides corresponding elastic force.

[0059] When the unlocking tube 13 is in the natural state, the ratio of the length of the spring section 153 to the length of the adjustment space 18 is greater than, and the length of the adjustment space 18 is not greater than 5 mm. When pulling the unlocking tube 13 to the right, the proximal end (the second pipe section 152) of the bourdon tube 14 can easily contact the limiting tube 16, ensuring that the valve stent 4 can be successfully released.

[0060] Preferably, in the natural state, the length of the adjustment space 18 is adjusted to 0 mm, that is, the bellows tube abuts against the limiting tube. Therefore, when releasing the valve stent 4, by pulling the traction strip 12 to the right, the bellows tube 14 will directly push against the limiting tube 16 and move to the right, and the limiting tube 16 is connected to the auxiliary part 141 through the connecting strip 17, so that the auxiliary part 141 also moves to the right, ensuring that the connection position between the hanging ear 32 and the hanging head 41 can be exposed immediately, ensuring that the valve stent 4 can be successfully released, and ensuring the normal progress of the interventional operation.

[0061] The inner diameter of the auxiliary part 141, the inner diameter of the first pipe section 151, the inner diameter of the second pipe section 152, and the inner diameter of the limiting tube 16 are equal, and the outer diameter of the auxiliary part 141, the outer diameter of the first pipe section 151, the outer diameter of the second pipe section 152, and the outer diameter of the limiting tube 16 are equal.

[0062] In the natural state, the inner diameter of the spring section 153 is equal to the inner diameter of the first pipe section 151, and the outer diameter of the spring section 153 is equal to the outer diameter of the first pipe section 151.

[0063] Make the inner diameter and outer diameter of each part of the unlocking tube 13 (except the connecting strip 17) basically the same, which is convenient for the hanging ear 32 to be inserted into the unlocking tube 13.

[0064] One end of the auxiliary part 141 close to the limiting tube 16 is provided with a first connection point, and the first connection point is located on the outer peripheral surface of the auxiliary part 141; one end of the limiting tube 16 close to the auxiliary part 141 is provided with a second connection point, and the second connection point is located on the outer peripheral surface of the limiting tube 16; in the circumferential direction of the auxiliary part 141, the first connection point and the second connection point are located at the same position, one end of the connecting strip 17 is connected to the first connection point, and the other end of the connecting tube is connected to the second connection point;

[0065] The connecting strip 17 includes a first inclined section, a straight section, and a second inclined section connected in sequence, and the straight section is parallel to the axis of the auxiliary part 141;

[0066] In the direction from the auxiliary part 141 towards the limiting tube 16, the first inclined section inclines towards the radially outer side of the auxiliary part 141, and the second inclined section inclines towards the radially inner side of the auxiliary part 141.

[0067] The length of the first inclined section is equal to that of the second inclined section, and the length of the straight section is much greater than that of the first inclined section. The inclined directions of the first inclined section and the second inclined section are such that the straight section is away from the bourdon tube 14, so that during the expansion and contraction of the bourdon tube 14, the connecting strip 17 will not be caught in the bourdon tube 14, ensuring that the bourdon tube 14 can expand and contract normally and ensuring the smooth progress of the interventional operation.

[0068] It should be understood that the above embodiments are merely exemplary and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that those skilled in the art can make to the above details will be included within the scope of the claims of the present invention.

Claims

1. An unlocking assembly, applied to a heart valve delivery system, characterized in that: It includes a control tube and an unlocking structure, wherein the unlocking structure includes an unlocking tube and a traction strip connected to each other, wherein the unlocking tube includes a spring tube, a limiting tube and a connecting strip, wherein the spring tube and the limiting tube are coaxially arranged with an adjustment space left therebetween, wherein the distal end of the connecting strip is connected to the distal end of the spring tube, the proximal end of the connecting strip is connected to the limiting tube, the distal end of the traction strip is connected to the proximal end of the spring tube, and the proximal end of the traction strip is connected to the distal end of the control tube.

2. The unlocking assembly according to claim 1, characterized in that: The spring tube comprises an auxiliary part and a spring part which are connected to each other. The auxiliary part is located at the distal end of the spring part. The auxiliary part is a tubular structure. The distal end of the connecting strip is connected to the auxiliary part.

3. The unlocking assembly according to claim 2, characterized in that: The spring portion comprises a first pipe segment, a spring segment and a second pipe segment which are connected in sequence, the first pipe segment is connected to the auxiliary portion, and the distal end of the traction strip is connected to the second pipe segment.

4. The unlocking assembly according to claim 3, characterized in that: When the unlocking tube is in a natural state, the ratio of the length of the spring segment to the length of the adjustment space is greater than 3, and the length of the adjustment space is no greater than 5 mm.

5. The unlocking assembly according to claim 3, characterized in that: The inner diameter of the auxiliary part, the inner diameter of the first pipe section, the inner diameter of the second pipe section and the inner diameter of the stop tube are equal, and the outer diameter of the auxiliary part, the outer diameter of the first pipe section, the outer diameter of the second pipe section and the outer diameter of the stop tube are equal; In a natural state, the inner diameter of the spring segment is equal to the inner diameter of the first pipe segment, and the outer diameter of the spring segment is equal to the outer diameter of the first pipe segment.

6. The unlocking assembly according to claim 2, characterized in that: The auxiliary part has an end close to the position limiting tube and a first connection point, and the first connection point is located on the outer circumferential surface of the auxiliary part; the position limiting tube has an end close to the auxiliary part and a second connection point, and the second connection point is located on the outer circumferential surface of the position limiting tube; in the circumferential direction of the auxiliary part, the first connection point and the second connection point are located at the same position, one end of the connection strip is connected to the first connection point, and the other end of the connection strip is connected to the second connection point; The connecting strip comprises a first inclined section, a straight section and a second inclined section connected in sequence, wherein the straight section is parallel to the axis of the auxiliary portion; In a direction from the auxiliary portion toward the limiting tube, the first inclined section is inclined toward the radial outer side of the auxiliary portion, and the second inclined section is inclined toward the radial inner side of the auxiliary portion.

7. The unlocking assembly according to any one of claims 1 to 6, characterized in that: There are multiple unlocking structures, and the multiple unlocking structures are arranged at equal intervals in the circumferential direction of the control tube.

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