Retraction state switching structure, handle assembly, and delivery for medical device delivery

Abstract

The utility model discloses a kind of rearward state switching structure for medical instrument conveyor, handle assembly and conveyor, comprising: outer sheath connecting piece, the first end of outer sheath connecting piece is used to fixedly connect outer sheath;Fixer, fixer is connected with outer sheath connecting piece and can rotate around the axis of outer sheath connecting piece;First state limiting structure, first state limiting structure is located on fixer, with the rotation of fixer, first state limiting structure can be in first state and second state;Second state limiting structure, in first state, first state limiting structure and second state limiting structure are in the rearward direction of outer sheath connecting piece and abut, in second state, first state limiting structure and second state limiting structure are completely staggered in circumferential direction.The utility model realizes the axial position of limiting outer sheath connecting piece, avoids the technical effect that instrument function failure caused by outer sheath rearward caused by transportation vibration and artificial misoperation possibly.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to a retraction state switching structure, a handle assembly, and a conveyor for a medical device delivery system. Background Technology

[0002] Interventional therapy is a new technology that has been applied in clinical practice in recent years. It involves pre-loading an implantable medical device into a delivery system, then introducing it into the human body, and releasing the medical device to the lesion site under the monitoring of a fluoroscopic device to achieve the therapeutic purpose. For example, in the treatment of cardiovascular diseases, a stent is delivered to the lesion through a delivery system, and then the stent is released to expand and support the blood vessel wall.

[0003] During release, the outer sheath connector needs to be retracted via the handle to expose the stent. The retraction process typically involves applying a backward pushing or pulling force to the outer sheath connector. During the procedure, it is crucial to prevent misoperation of the outer sheath connector before the stent reaches the lesion, which could lead to instrument malfunction. Similarly, it is essential to avoid potential instrument malfunction due to vibrations during transport that could cause the outer sheath to retract. Utility Model Content

[0004] The main objective of this invention is to provide a retraction state switching structure, handle assembly, and delivery device for a medical device delivery system, in order to solve the problem in related technologies where the outer sheath connector is easily retracted due to misoperation during transportation or surgery, leading to device malfunction.

[0005] To achieve the above objectives, this utility model provides a retraction state switching structure for a medical device delivery device. The retraction state switching structure is adapted to be installed within the handle body of an implantable medical device delivery device, and includes:

[0006] An outer sheath tube connector, the first end of which is used to fix the outer sheath tube, and the outer sheath tube connector is capable of linearly moving along the axial direction relative to the handle body;

[0007] A retainer, which is connected to the outer sheath connector and is rotatable about the axis of the outer sheath connector;

[0008] A first state limiting structure is disposed on the fixture, and as the fixture rotates, the first state limiting structure can be in a first state and a second state.

[0009] The second state limiting structure, in the first state, the first state limiting structure and the second state limiting structure abut against each other in the retraction direction of the outer sheath connector, and in the second state, the first state limiting structure and the second state limiting structure are completely offset in the circumferential direction.

[0010] Furthermore, the retraction state switching structure also includes a limiting tube, which is used to fix it inside the handle body, and the second state limiting structure is disposed on the limiting tube.

[0011] Furthermore, the first state limiting structure is provided on the inner wall of the fixer, the limiting tube is sleeved inside the fixer, and the fixer and the outer sheath tube connector can move linearly along the axial direction relative to the limiting tube;

[0012] The second state restriction structure is disposed on the outer wall of the limiting tube.

[0013] Furthermore, the first state limiting structure is configured as two or more distributed at intervals along the circumference of the fixer, and the second state limiting structure is configured as two or more distributed at intervals along the circumference of the limiting tube.

[0014] Furthermore, the first state limiting structure includes a first stop, and the second state limiting structure includes a second stop.

[0015] Furthermore, an arc-shaped groove is provided at one end of the first stop block facing the limiting tube, and the arc-shaped groove fits against the surface of the limiting tube.

[0016] Furthermore, it also includes a locking structure, which is disposed between the outer sheath connector and the retainer, and the locking structure is used to lock the rotation angle of the retainer.

[0017] Furthermore, the locking structure includes a spring-loaded ball and a positioning groove, wherein the spring-loaded ball is located on the rear end face of the outer sheath connector, and the positioning groove is located on the front end face of the retainer; or,

[0018] The spring top ball is located on the front end face of the retainer, and the positioning groove is located on the rear end face of the outer sheath tube connector.

[0019] Furthermore, at least two positioning slots are provided and distributed along the circumference of the retainer, one of the positioning slots is used to cooperate with the spring top ball to restrict the first state limiting structure in the first state, and the other positioning slot is used to cooperate with the spring top ball to restrict the first state limiting structure in the second state.

[0020] Furthermore, the outer sheath connector includes a sheath joint and a connecting rod, the connecting rod being inserted to fix the outer sheath, the fixing device being connected to the sheath joint and rotatable relative to the sheath joint.

[0021] Furthermore, a connecting hook is provided on the rear end face of the sheath connector, and a connecting groove is provided on the inner wall of the fixer. The connecting hook is hooked into the connecting groove and can rotate within the connecting groove.

[0022] Furthermore, the inner wall of the retainer is provided with an arc-shaped flange, and the flange is provided with a notch, through which the hook can pass;

[0023] The retainer is provided with an arc-shaped clip, and a sealing head is provided on one end of the arc-shaped clip facing the sheath connector. The sealing head is inserted and engaged with the notch to seal the notch. The arc-shaped clip is fixed to the inner wall of the retainer, and there is a gap between the front end of the arc-shaped clip and the rear end of the flange to form the connecting groove.

[0024] According to another aspect of this application, a handle assembly for a medical device delivery device is provided, including the aforementioned retracted state switching structure and a handle body.

[0025] According to another aspect of this application, a medical device delivery device is provided, comprising: a sheath assembly, a handle body, and the aforementioned sheath retraction structure;

[0026] The sheath assembly includes an outer sheath and a sheath core assembly. The outer sheath is movably inserted into the handle body and fixedly connected to the outer sheath connector. The sheath core assembly is movably inserted into the outer sheath.

[0027] In this embodiment of the utility model, an outer sheath tube connector is provided. The first end of the outer sheath tube connector is used to fix the outer sheath tube. The outer sheath tube connector can move linearly along the axial direction relative to the handle body. A retainer is provided, which is connected to the outer sheath tube connector and can rotate relative to the axis of the outer sheath tube connector. A first state limiting structure is provided on the retainer. With the rotation of the retainer, the first state limiting structure can be in a first state and a second state. A second state limiting structure is provided. In the first state, the first state limiting structure and the second state limiting structure abut against each other in the retraction direction of the outer sheath tube connector. In the second state, the first state limiting structure and the second state limiting structure are completely offset in the circumferential direction. After loading is complete, the retainer is rotated to bring the first-state limiting structure to its first state. In this first state, the first-state limiting structure and the second-state limiting structure abut against each other in the retraction direction of the outer sheath connector, preventing the outer sheath connector from retracting axially. This effectively restricts the axial position of the outer sheath connector, preventing accidental pulling during surgery that could cause the outer sheath to retract, or damage from transport vibrations that could lead to the outer sheath retraction. Once the set position is reached, the retainer can be rotated to bring the second-state limiting structure to its second state. In this second state, the first-state limiting structure and the second-state limiting structure are completely misaligned circumferentially, allowing the outer sheath connector to retract axially, thus enabling the release of the medical device. Attached Figure Description

[0028] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model, making other features, objects, and advantages of the utility model more apparent. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0029] Figure 1 This is a schematic diagram of the first state limiting structure in the first state according to an embodiment of the present utility model;

[0030] Figure 2 This is a top view of the first state limiting structure in the first state according to an embodiment of the present utility model;

[0031] Figure 3 This is a top view of the first state limiting structure in the second state according to an embodiment of the present utility model;

[0032] Figure 4 This is a structural schematic diagram of the outer sheath connector according to an embodiment of this utility model;

[0033] Figure 5 This is an exploded view of the assembly structure of the fixator and sheath joint according to an embodiment of this utility model;

[0034] Figure 6 This is a schematic diagram of the assembly structure of the fixator and the sheath connector according to an embodiment of this utility model;

[0035] Figure 7 This is a structural diagram of the fixing device and sheath joint assembly locking structure according to the embodiment of this utility model;

[0036] Figure 8 This is a cross-sectional view of the assembled fixture and sheath connector according to an embodiment of the present invention.

[0037] Among them, 14 is the outer sheath connector; 140 is the connecting rod; 141 is the sheath joint; 1410 is the connecting hook; 15 is the limiting tube; 151 is the second state limiting structure; 19 is the fixing device; 190 is the first state limiting structure; 191 is the flange; 192 is the notch; 193 is the arc-shaped clip; 194 is the sealing head; 195 is the connecting groove; 21 is the locking structure; 210 is the spring ball; and 211 is the positioning groove. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0039] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein.

[0040] In this invention, the terms "upper," "lower," "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0041] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0042] Furthermore, the terms "set up," "equipped with," "connected," and "fixed" should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] In addition, the term "multiple" should mean two or more.

[0044] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] To solve related technical problems, such as Figures 1 to 4 As shown, this utility model embodiment provides a retraction state switching structure for a medical device delivery device. The retraction state switching structure is adapted to be installed within the handle body of the implantable medical device delivery device, and includes:

[0046] The outer sheath tube connector 14 has a first end for fixedly connecting the outer sheath tube, and the outer sheath tube connector 14 can move linearly along the axial direction relative to the handle body.

[0047] Fixture 19 is connected to the outer sheath connector 14 and can rotate about the axis of the outer sheath connector 14;

[0048] The first state limiting structure 190 is disposed on the fixer 19. As the fixer 19 rotates, the first state limiting structure 190 can be in a first state and a second state.

[0049] In the first state, the first state limiting structure 190 and the second state limiting structure 151 abut against each other in the retraction direction of the outer sheath connector 14. In the second state, the first state limiting structure 190 and the second state limiting structure 151 are completely offset in the circumferential direction.

[0050] Medical device delivery systems are used to deliver implantable medical devices to the lesion site within the body and to release the implantable medical device. Taking a stent as an example, the delivery system mainly consists of a handle body, an outer sheath connected to the handle body, and a sheath core assembly. The stent can be loaded into the loading space at the front end of the outer sheath and sheath core assembly, where it is in a compressed state and constrained by a release mechanism. During the intervention, a guidewire inserted into the sheath core assembly guides the outer sheath and sheath core assembly to move as a whole, and this movement can be controlled by operating the handle. After reaching the lesion site, the outer sheath is retracted by operating the handle body to expose the stent constrained on the sheath core assembly. Then, the release mechanism is operated on the handle body to release the stent, which expands and supports itself against the blood vessel wall.

[0051] In this embodiment, the retraction state switching structure can be installed inside the handle body of the conveyor. When in a set state, it can be driven to pull the outer sheath tube back to expose the support. The retraction state switching structure mainly includes an outer sheath tube connector 14, a retainer 19, a first state limiting structure 190, and a second state limiting structure 151. The front end of the outer sheath tube connector 14 can be fixedly connected to the outer sheath tube. The outer sheath tube connector 14 has a channel for the sheath core assembly to pass through. The retainer 19 is connected to the outer sheath tube connector 14, and the connection relationship between the retainer 19 and the outer sheath tube connector 14 satisfies the following conditions: the retainer 19 can rotate relative to the outer sheath tube connector 14, while the retainer 19 and the outer sheath tube connector 14 are not separated. For example, the retainer 19 and the outer sheath tube connector 14 can be connected by a bearing or by a corresponding slide rail, etc., which is not limited in this embodiment.

[0052] The first state limiting structure 190 is disposed on the fixture 19. During the rotation of the fixture 19, the first state limiting structure 190 has a first state and a second state. For example, as Figure 2 As shown, when the retainer 19 is in the initial position, the first-state limiting structure 190 is in the first state. Figure 3 As shown, when the retainer 19 rotates by a set angle, the first-state limiting structure 190 is in the second state. In essence, in this embodiment, the first state and the second state refer to different circumferential positions of the first-state limiting structure 190.

[0053] like Figure 1 and Figure 2 As shown, the second state limiting structure 151 is used to cooperate with the first state limiting structure 190. When the first state limiting structure 190 is in the first state, the first state limiting structure 190 and the second state limiting structure 151 abut against each other in the retraction direction of the outer sheath connector 14, thereby limiting the retraction movement of the outer sheath connector 14. Figure 3As shown, when the first state restriction structure 190 is in the second state, the first state restriction structure 190 and the second state restriction structure 151 are completely misaligned in the circumferential direction, and the outer sheath tube connector 14 can be freely retracted at this time.

[0054] The second state limiting structure 151, acting as a fixing member, can be mounted on the handle body. For example, a protrusion on the handle body corresponding to the first state limiting structure 190 can serve as the second state limiting structure 151, while a protrusion on the fixing member 19 can serve as the first state limiting structure 190. The two restrict the backward movement of the outer sheath connector 14 by their front and rear end faces abutting against each other. One of the protrusions can have a through groove, and the other protrusion can rotate into and out of the through groove. The cooperation of the two restricts the backward movement of the outer sheath connector 14. The second state limiting structure 151 can also be mounted on other fixed components. In this embodiment, its mounting position and specific structure are not limited, as long as they can satisfy the above functions.

[0055] In this embodiment, after loading is completed, the retainer 19 is rotated to place the first state limiting structure 190 in the first state. In the first state, the first state limiting structure 190 and the second state limiting structure 151 abut against each other in the retraction direction of the outer sheath connector 14, preventing the outer sheath connector 14 from retracting axially. This achieves the technical effect of limiting the axial position of the outer sheath connector 14, avoiding accidental pulling of the outer sheath connector 14 during surgery, or the outer sheath being pulled back due to transportation vibration. When the set position is reached, the retainer 19 can be rotated to place the second state limiting structure 151 in the second state. In the second state, the first state limiting structure 190 and the second state limiting structure 151 are completely misaligned in the circumferential direction, allowing the outer sheath connector 14 to retract axially, thereby enabling the release operation of the medical device.

[0056] As a preferred implementation method, such as Figure 1 As shown, the retraction state switching structure also includes a limiting tube 15, which is used to fix it inside the handle body, and the second state limiting structure 151 is provided on the limiting tube 15.

[0057] Specifically, in this embodiment, the limiting tube 15 can be fixed inside the handle body and axially connected to the outer sheath tube connector 14. During the retraction process, the outer sheath tube connector 14 can move linearly along the axial direction of the limiting tube 15. Therefore, the limiting tube 15 can guide the linear movement of the outer sheath tube connector 14, improving the accuracy of the movement. In addition, after setting the limiting tube 15, the second state limiting structure 151 can be set on the limiting tube 15, which can simplify the structure of the handle body. When the first state limiting structure 190 is in the second state, the outer sheath tube connector 14 can move axially along the limiting tube 15. At this time, the second state limiting structure 151 can pass through the outer sheath tube connector 14.

[0058] In one implementation, such as Figure 1 As shown, the first state limiting structure 190 is provided on the inner wall of the fixer 19, the limiting tube 15 is sleeved in the fixer 19, and the fixer 19 and the outer sheath tube connector 14 can move linearly along the axial direction relative to the limiting tube 15; the second state limiting structure 151 is provided on the outer wall of the limiting tube 15.

[0059] Specifically, in this embodiment, the limiting tube 15 is a hollow tubular structure. The retainer 19 can be connected to the rear end of the outer sheath tube connector 14. After the limiting tube 15 is fixed inside the handle body, it can be sleeved inside the retainer 19, so that the limiting tube 15 can dock with the outer sheath tube connector 14. The outer sheath tube connector 14 and the retainer 19 are provided with channels for the limiting tube 15 to pass through. Therefore, a second state limiting structure 151 can be provided on the outer wall of the limiting tube 15, and a first state limiting structure 190 can be provided on the inner wall of the retainer 19.

[0060] To improve the stability of the first-state limiting structure 190 and the second-state limiting structure 151 when they abut against each other in the retraction direction of the outer sheath connector 14, in this embodiment, two or more first-state limiting structures 190 are provided and distributed circumferentially at intervals along the retainer 19, and two or more second-state limiting structures 151 are provided and distributed circumferentially at intervals along the limiting tube 15. In a preferred embodiment, two of each of the first-state limiting structures 190 and the second-state limiting structure 151 are provided and symmetrically distributed along the axial direction.

[0061] In one specific implementation, such as Figures 1 to 3 As shown, the first state limiting structure 190 includes a first stop, and the second state limiting structure 151 includes a second stop. In this embodiment, the retraction movement of the outer sheath tube connector 14 is limited by the abutting of the end faces of the first and second stops. The circumferential misalignment of the first and second stops allows the outer sheath tube connector 14 to retract freely. Its structure is simple and easy to use.

[0062] Since the outer sheath connector 14 retracts along the limiting tube 15, an arc-shaped groove is provided at the end of the first stop facing the limiting tube 15 in this embodiment. The arc-shaped groove fits against the surface of the limiting tube 15. During the retraction movement of the outer sheath connector 14, the arc-shaped groove of the first stop can always fit against the surface of the limiting tube 15 and slide backward along the surface of the limiting tube 15, thereby improving the movement accuracy of the outer sheath connector 14.

[0063] In the above embodiment, the retraction movement of the outer sheath connector 14 is restricted or permitted by rotating the retainer 19. To avoid accidental rotation of the retainer 19, such as... Figure 7 and Figure 8 As shown, this embodiment also includes a locking structure 21, which is disposed between the outer sheath tube connector 14 and the retainer 19. The locking structure 21 is used to lock the rotation angle of the retainer 19.

[0064] Specifically, the locking structure 21 can lock the retainer 19 at a set rotation angle, for example, locking the retainer 19 in its initial position. At this time, the first state limiting structure 190 on the retainer 19 is in the first state, which can restrict the retraction movement of the outer sheath connector 14. When it is necessary to allow the outer sheath connector 14 to retract, the retainer 19 needs to be unlocked so that the retainer 19 can rotate, and the first state limiting structure 190 is in the second state. For ease of operation, it is preferable that the locking structure 21 provides a certain resistance to the rotation of the retainer 19, and the operator needs to overcome this resistance to operate the retainer 19 to rotate.

[0065] In one embodiment, the locking structure 21 includes a spring top ball 210 and a positioning groove 211. The spring top ball 210 is located on the rear end face of the outer sheath tube connector 14, and the positioning groove 211 is located on the front end face of the retainer 19.

[0066] When the first-state limiting structure 190 is in the first state, the spring ball 210 is engaged in the positioning groove 211, thereby limiting the rotation of the retainer 19. When unlocking is required, the retainer 19 can be rotated, and under the action of external force, the spring ball 210 compresses the spring and disengages from the positioning groove 211, at which point the retainer 19 can rotate freely.

[0067] It is understandable that the spring top ball 210 can also be located on the front end face of the retainer 19, and the positioning groove 211 can be located on the rear end face of the outer sheath connector 14.

[0068] Of course, the appropriate locking structure 21 can also be selected according to actual needs. The specific description of the locking structure 21 in this embodiment is not restrictive.

[0069] Since the first state limiting structure 190 has a first state and a second state, meaning the first state limiting structure 190 needs to be in two rotation angles, in this embodiment, at least two positioning grooves 211 are provided and distributed along the circumference of the retainer 19. One positioning groove 211 is used to cooperate with the spring top ball 210 to limit the first state limiting structure 190 in the first state, and the other positioning groove 211 is used to cooperate with the spring top ball 210 to limit the first state limiting structure 190 in the second state.

[0070] In one embodiment of the outer sheath connector 14, such as Figure 1 and Figure 4 As shown, the outer sheath connector 14 includes a sheath joint 141 and a connecting rod 140. The connecting rod 140 is used to insert and fix the outer sheath. The retainer 19 is connected to the sheath joint 141 and can rotate relative to the sheath joint 141.

[0071] Specifically, both the sheath connector 141 and the connecting rod 140 are hollow structures. The channel inside the connecting rod 140 allows the outer sheath to pass through and also allows the sheath core assembly inside the outer sheath to pass through. The corresponding channel inside the sheath connector 141 has the same function. The connecting rod 140 can be a slender rod-shaped structure to construct the corresponding channel. The sheath connector 141 can be a short and thick cylindrical structure to connect the retainer 19. In one embodiment, a rib is provided inside the sheath connector 141, and the connecting rod 140 is connected through the rib. A groove is provided on the limiting tube 15, and the rib can slide in the groove, so that the limiting tube 15 can pass through the interior of the sheath connector 141 and be sleeved on the connecting rod 140.

[0072] In one implementation, such as Figure 5 and Figure 6 As shown, to achieve the connection between the retainer 19 and the sheath connector 141, a connecting hook 1410 is provided on the rear end face of the sheath connector 141, and a connecting groove 195 is provided on the inner wall of the retainer 19. The connecting hook 1410 is hooked into the connecting groove 195 and can rotate within the connecting groove 195. In this embodiment, through the cooperation of the connecting groove 195 and the connecting hook 1410, the retainer 19 can both rotate relative to the sheath connector 141 and maintain its connection with the sheath connector 141.

[0073] Specifically, the inner wall of the retainer 19 is provided with an arc-shaped flange 191, and the flange 191 is provided with a notch 192, through which the hook can pass;

[0074] The retainer 19 is provided with an arc-shaped clip 193. A sealing head 194 is provided on the end of the arc-shaped clip 193 facing the sheath connector 141. The sealing head 194 is inserted and engaged with the notch 192 to seal the notch 192. The arc-shaped clip 193 is fixed to the inner wall of the retainer 19, and there is a gap between the front end of the arc-shaped clip 193 and the rear end of the flange 191 to form a connecting groove 195.

[0075] In this embodiment, an arc-shaped flange 191 is provided on the inner wall of the retainer 19. The number of notches 192 on the flange 191 corresponds to the number of connecting hooks 1410 on the sheath connector 141. The connecting hooks 1410 can pass through the notches 192 and be hooked onto the flange 191. Taking two symmetrical connecting hooks 1410 as an example, the flange 191 on the retainer 19 has two symmetrical notches 192, which divide the flange 191 into two segments. To limit the connecting hook 1410 to the flange 191, an arc-shaped retainer 193 is also provided inside the retainer 19. The arc-shaped retainer 193 can be installed on the inner wall of the retainer 19. The arc-shaped retainer 193 corresponds to the flange 191 in the axial direction, and the end face of the arc-shaped retainer 193 can fit against the end face of the connecting hook 1410. The arc-shaped retainer 193 and the flange 191 form a connecting groove 195, which limits the connecting hook 1410 within the connecting groove 195. To prevent the connecting hook 1410 from detaching through the notch 192, a sealing head 194 is provided on the arc-shaped retainer 193. After installation, the sealing head 194 is inserted into the notch 192. With this configuration, the retainer 19 can be rotated, and the connecting groove 195 rotates relative to the connecting hook 1410, while the connecting hook 1410 remains within the connecting groove 195.

[0076] To facilitate the positioning of the arc-shaped clip 193 and form a connecting groove 195 of suitable size, a limiting protrusion is provided on the flange 191 near the notch 192 in this embodiment. The limiting protrusion can abut against the end face of the arc-shaped clip 193, thereby positioning the arc-shaped clip 193. The arc-shaped clip 193 can be bonded and fixed to the inner wall of the retainer 19.

[0077] According to another aspect of this application, a handle assembly for a medical device delivery device is provided, including the aforementioned retracted state switching structure and a handle body.

[0078] According to another aspect of this application, a medical device delivery device is provided, comprising: a sheath assembly, a handle body, and the aforementioned sheath retraction structure;

[0079] The sheath assembly includes an outer sheath and a sheath core assembly. The outer sheath is movably inserted into the handle body and fixedly connected to the outer sheath connector 14. The sheath core assembly is movably inserted into the outer sheath.

[0080] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A retraction state switching structure for a medical device delivery system, characterized in that, The retraction state switching structure is adapted to be installed within the handle body of the implantable medical device delivery device, and includes: An outer sheath tube connector, the first end of which is used to fix the outer sheath tube, and the outer sheath tube connector is capable of linearly moving along the axial direction relative to the handle body; A retainer, which is connected to the outer sheath connector and is rotatable about the axis of the outer sheath connector; A first state limiting structure is disposed on the fixture, and as the fixture rotates, the first state limiting structure can be in a first state and a second state. The second state limiting structure, in the first state, the first state limiting structure and the second state limiting structure abut against each other in the retraction direction of the outer sheath connector, and in the second state, the first state limiting structure and the second state limiting structure are completely offset in the circumferential direction.

2. The retreat state switching structure according to claim 1, characterized in that, The retraction state switching structure also includes a limiting tube, which is used to fix it inside the handle body, and the second state limiting structure is disposed on the limiting tube.

3. The retreat state switching structure according to claim 2, characterized in that, The first state limiting structure is disposed on the inner wall of the fixer, the limiting tube is sleeved inside the fixer, and the fixer and the outer sheath tube connector can move linearly along the axial direction relative to the limiting tube; The second state restriction structure is disposed on the outer wall of the limiting tube.

4. The retreat state switching structure according to claim 3, characterized in that, The first state limiting structure is configured as two or more distributed at intervals along the circumference of the fixer, and the second state limiting structure is configured as two or more distributed at intervals along the circumference of the limiting tube.

5. The retreat state switching structure according to claim 4, characterized in that, The first state restriction structure includes a first stop, and the second state restriction structure includes a second stop.

6. The retreat state switching structure according to claim 1, characterized in that, It also includes a locking structure, which is disposed between the outer sheath connector and the retainer, and the locking structure is used to lock the rotation angle of the retainer.

7. The retreat state switching structure according to claim 6, characterized in that, The locking structure includes a spring-loaded ball and a positioning groove. The spring-loaded ball is located on the rear end face of the outer sheath connector, and the positioning groove is located on the front end face of the retainer; or, The spring top ball is located on the front end face of the retainer, and the positioning groove is located on the rear end face of the outer sheath tube connector.

8. The retreat state switching structure according to claim 7, characterized in that, The positioning groove is provided in at least two and distributed along the circumference of the retainer. One of the positioning grooves is used to cooperate with the spring top ball to restrict the first state limiting structure in the first state, and the other positioning groove is used to cooperate with the spring top ball to restrict the first state limiting structure in the second state.

9. The retreat state switching structure according to claim 1, characterized in that, The outer sheath connector includes a sheath joint and a connecting rod. The connecting rod is used to insert and fix the outer sheath. The fixer is connected to the sheath joint and can rotate relative to the sheath joint.

10. The retreat state switching structure according to claim 9, characterized in that, The rear end face of the sheath connector is provided with a connecting hook, and the inner wall of the fixer is provided with a connecting groove. The connecting hook is hooked into the connecting groove and can rotate within the connecting groove.

11. The retreat state switching structure according to claim 10, characterized in that, The inner wall of the retainer is provided with an arc-shaped flange, and the flange is provided with a notch, through which the hook can pass; The retainer is provided with an arc-shaped clip, and a sealing head is provided on one end of the arc-shaped clip facing the sheath connector. The sealing head is inserted and engaged with the notch to seal the notch. The arc-shaped clip is fixed to the inner wall of the retainer, and there is a gap between the front end of the arc-shaped clip and the rear end of the flange to form the connecting groove.

12. A handle assembly for a medical device delivery system, characterized in that, It includes the retracted state switching structure as described in any one of claims 1 to 11, and the handle body.

13. A medical device delivery device, characterized in that, include: The sheath assembly, the handle body, and the sheath retraction structure as described in any one of claims 1 to 11; The sheath assembly includes an outer sheath and a sheath core assembly. The outer sheath is movably inserted into the handle body and fixedly connected to the outer sheath connector. The sheath core assembly is movably inserted into the outer sheath.

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