A push handle and a delivery system

Abstract

This invention belongs to the field of medical device technology, specifically relating to a push handle, including a handle body and a stepping locking device disposed on the handle body. The stepping locking device includes a control mechanism and a compensation mechanism. The control mechanism operates a clamping instrument via a control line. The control mechanism includes a sleeve and a control rod slidably connected to the sleeve. The control line can be connected between the clamping instrument and the control rod. The compensation mechanism is used to adjust the travel of the control rod. When the connector becomes loose, the travel of the control rod can be adjusted by the compensation mechanism to compensate for the loose length of the connector, thereby restoring the normal operation of the clamping instrument; thus improving surgical efficiency and success rate.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a push handle and delivery system. Background Technology

[0002] Mitral valve disease is a common condition among the elderly, including two common types: mitral regurgitation and mitral stenosis, with mitral regurgitation being the most prevalent. Statistics show that the incidence of mitral regurgitation in people over 75 years of age is as high as 10%. Mild mitral regurgitation generally does not affect daily life, while moderate to severe mitral regurgitation requires intervention. Traditional surgical treatment involves open-heart surgery, where the heart is opened under cardiopulmonary bypass to repair or replace the valves. However, high-risk patients cannot tolerate this procedure. In recent years, interventional therapy has emerged, offering hope to high-risk patients with mitral regurgitation. Interventional therapy typically involves delivering instruments to the affected area via catheter to repair or replace the valve.

[0003] Currently, most transcatheter mitral valve repair products use a clamping device to clamp the anterior and posterior leaflets of the mitral valve, reducing the valve opening area and thus achieving the purpose of treating regurgitation. Specifically, a control line is used to connect the clamping device, and the control line is operated by pushing the handle to control the clamping device to capture the mitral valve leaflets.

[0004] The control suture ends are difficult to secure, and during long-term storage, they are prone to loosening. Furthermore, the tension on the control suture increases when the outer and inner sheaths are adjusted during surgery, also posing a risk of the suture end becoming detached from the operating end of the push handle. Loosening of the control suture leads to an increase in its effective length, affecting the normal operation of the clamping instrument and potentially causing surgical failure in severe cases.

[0005] Therefore, a new technological approach is needed to solve the aforementioned problems of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to at least solve the problem of loose control wires affecting the normal operation of clamping devices in existing mitral valve repair devices.

[0007] This invention proposes a push handle, comprising a handle body and a stepping locking device disposed on the handle body. The stepping locking device includes a control mechanism and a compensation mechanism. The control mechanism operates a clamping device via a control line. The control mechanism includes a sleeve and a control rod slidably connected to the sleeve. The control line can be connected between the clamping device and the control rod. The compensation mechanism is used to adjust the travel of the control rod.

[0008] In the event of a loose connection, the push handle of this invention can adjust the travel of the control lever through a compensation mechanism to compensate for the length of the loose connection, thereby restoring the normal operation of the clamping instrument and improving surgical efficiency and success rate.

[0009] In addition, the push handle according to the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, the compensation mechanism includes a stepping component and a limiting component. The stepping component includes a stepping positioning block connected to the sleeve and a stepping locking strip disposed axially on the stepping positioning block. The stepping locking strip is used to engage the control lever.

[0011] In some embodiments of the present invention, the stepping bar includes a plurality of teeth spaced axially on the stepping positioning block, the plurality of teeth being used to selectively engage the control lever; the proximal end of the control lever is connected to the control line, and the distal end of the control lever is provided with an elastic buckle, the elastic buckle being used to selectively engage with one of the plurality of teeth.

[0012] In some embodiments of the present invention, the limiting component includes a limiting ring rotatably connected to the sleeve, a push handle for controlling the rotation of the limiting ring is provided on the outer side of the limiting ring, and a stop block is provided on the inner side of the limiting ring, the stop block being used to limit the travel of the control lever.

[0013] In some embodiments of the present invention, a support ring is provided at the proximal end of the limiting ring, the support ring is fixedly connected to the handle body, the limiting ring is rotatably connected to the support ring, and an engaging portion is provided between the support ring and the limiting ring.

[0014] In some embodiments of the present invention, a mounting platform is provided on the outer wall of the control lever, and the axial height of the stop block is greater than the axial height of the mounting platform; a guide groove is provided on the inner wall of the sleeve along the axial direction, the mounting platform is slidably connected to the guide groove, and a clearance groove is provided on the side of the guide groove along the circumferential direction, the clearance groove being used to adapt to the stop block.

[0015] In some embodiments of the present invention, the locking teeth include positioning teeth and a plurality of compensating teeth. The positioning teeth are disposed on the distal side of the stepping locking strip, and the plurality of compensating teeth are spaced apart on the proximal side of the stepping locking strip. When the stop block is located in the guide groove, the elastic buckle can engage with the positioning teeth. When the stop block is located in the clearance groove, the elastic buckle can engage with one of the compensating teeth.

[0016] In some embodiments of the present invention, a return groove is provided axially on the inner wall of the sleeve, the return groove and the guide groove are spaced apart in the circumferential direction of the sleeve, a rotating platform is provided between the return groove and the guide groove, the axial height of the rotating platform is less than the axial height of the mounting plate, and the rotating platform is connected to the return groove and the guide groove.

[0017] In some embodiments of the present invention, the control mechanism further includes a guide rod passing through the sleeve, the guide rod being coaxially arranged with the sleeve, and the control lever having a through control cavity along the axial direction. The control lever is sleeved with the guide rod through the control cavity, thereby allowing the control lever to slide along the guide rod.

[0018] In some embodiments of the present invention, the guide rod is provided with a through connecting cavity along the axial direction, the connecting cavity being connected to the interior of the control cavity and the handle body; the control line passes through the connecting cavity and the control cavity in sequence.

[0019] In some embodiments of the present invention, an end cap is provided at the proximal end of the control lever, the end cap is detachably connected to the control lever, a sealing structure is provided between the control lever and the end cap, and the control line is connected to the sealing structure.

[0020] The present invention also proposes a delivery system, comprising a push handle as described in any of the preceding claims and a delivery sheath connected to the push handle, wherein the clamping device is disposed at the distal end of the delivery sheath, the clamping device comprising a hook, and the control line being detachably connected to the hook. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the push handle in an embodiment of the present invention;

[0022] Figure 2 As described in the embodiments of the present invention Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the internal structure of the push handle in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the stepping locking device in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the overall structure of the stepping locking device in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the control lever structure in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the control lever when it is engaged in an embodiment of the present invention;

[0028] Figure 8 This is a cross-sectional view of the compensation mechanism in an embodiment of the present invention;

[0029] Figure 9 As described in the embodiments of the present invention Figure 7 Enlarged view of point C in the middle;

[0030] Figure 10 This is a schematic diagram of the limiting ring structure in an embodiment of the present invention;

[0031] Figure 11 This is an assembly diagram of the sleeve and the limiting ring in an embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the limiting ring being located in the avoidance groove in an embodiment of the present invention;

[0033] Figure 13 This is a schematic diagram of the assembly of the push handle and the handle body in an embodiment of the present invention;

[0034] Figure 14 This is a schematic diagram of the stop block abutting against the mounting platform in an embodiment of the present invention;

[0035] Figure 15 This is an embodiment of the present invention. Figure 13 Enlarged view at point D;

[0036] Figure 16 This is an embodiment of the present invention. Figure 13 Cross-sectional view at point AA;

[0037] Figure 17 This is an embodiment of the present invention. Figure 15 Enlarged view at point E in the middle;

[0038] Figure 18 This is a schematic diagram of the filter basket structure in an embodiment of the present invention;

[0039] Figure 19 This is a schematic diagram of the filter element in an embodiment of the present invention;

[0040] Figure 20 This is a schematic diagram of the overall structure of the assembly substrate in an embodiment of the present invention;

[0041] Figure 21 This is a schematic diagram of the assembly structure of the assembly substrate in an embodiment of the present invention.

[0042] Figure Labels

[0043] 10. Push handle; 20. Handle body; 21. Operating hole; 30. Stepping locking device; 40. Clamping device; 41. Hook; 50. Delivery sheath; 100. Control mechanism; 110. Sleeve; 111. Guide groove; 112. Alternating groove; 113. Return groove; 114. Rotating platform; 120. Control lever; 121. Control cavity; 122. Grip; 123. End cap; 124. Scale structure; 130. Elastic buckle; 140. Hanging platform; 150. Guide rod; 151. Connecting cavity; 152. Sealing gasket; 200. Compensation Mechanism; 210, Stepping component; 211, Stepping positioning block; 212, Stepping locking strip; 213, Locking tooth; 214, Positioning tooth; 215, Compensating tooth; 220, Limiting component; 221, Limiting ring; 222, Push handle; 223, Stop block; 224, Limiting element; 230, Support ring; 240, Engaging part; 241, Stop locking element; 242, Unlocking locking element; 300, Control line; 400, Sealing structure; 410, Sealing groove; 411, Notch; 420, Sealing ring; 430, Fixing ring; 440, First channel; 450, Second channel. Detailed Implementation

[0044] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0045] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a," "an," and "described" as used herein may also include the plural forms. Although the terms first, second, third, etc., may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another region, layer, or section.

[0046] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "upper," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure.

[0047] For ease of description, the following description uses the terms "proximal" and "distal," where "proximal" refers to the end closer to the operator and "distal" refers to the end farther from the operator. The phrase "axial direction" should be understood in this patent as indicating the direction in which the interventional element is advanced and de-escalated, and the direction perpendicular to the "axial direction" is defined as the "radial direction."

[0048] Example 1: This embodiment of the invention proposes a push handle 10, wherein, as shown in the example... Figures 1 to 4 As shown, the device includes a handle body 20 and a stepping locking device 30 disposed on the handle body 20. The stepping locking device 30 includes a control mechanism 100 and a compensation mechanism 200, which are respectively disposed on the handle body 20. The control mechanism 100 controls the clamping device 40 via a control line 300. The control mechanism 100 includes a sleeve 110 and a control lever 120, which is slidably connected to the sleeve 110. The sleeve 110 is fixedly disposed within the handle body 20.

[0049] One end of the control line 300 is connected to the clamping device 40, and the other end is connected to the control lever 120. When the clamping device 40 needs to be operated, the control line 300 is moved by pushing or pulling the control lever 120, thereby controlling the clamping device 40. The control line 300 is made of polyethylene, PET, e-PTFE, or PTFE wire.

[0050] Since the clamping instrument 40 will remain in the body after the surgery, and the control line 300 used to operate the clamping instrument 40 needs to be retrieved, the control line 300 needs to be detachably connected to both the control lever 120 and the clamping instrument 40. When it is necessary to retrieve the control line 300, the operator separates the proximal end of the control line 300 from the control lever 120 and then pulls the control line 300 out of the handle body 20.

[0051] Because the control line 300 and the control lever 120 are detachably connected, bending the delivery sheath 50 during surgery increases the tensile force on the control line 300. Additionally, when the product is packaged on a shelf, the delivery sheath 50 is always in a bent state, and this prolonged bending also increases the tensile force on the control line 300. This increased tensile force can cause slippage at the detachable connection between the control line 300 and the control lever 120, thus increasing the actual effective length of the control line 300. If the connection between the control line 300 and the control lever 120 becomes loose, it will affect the normal progress of the surgery.

[0052] In existing technologies, the control line is usually removed from the control lever, tightened, and then reconnected to the control lever before the surgery is restarted. However, this approach greatly increases the surgery time and operational difficulty.

[0053] Additionally, if the clamping instrument 40 is found to be hooked or entangled with chordae tendineae during surgery, it can be straightened to remove the tendineae and the procedure can be restarted, provided that the clamping instrument 40 has not been pulled out of the control line 300 and released. Alternatively, if the clamping instrument 40 needs to be replaced, it can be straightened, retrieved, and removed from the body for replacement. Figure 2 As shown, if the opening size of the clamping device 40 is larger than the inner diameter of the delivery sheath 50 during retrieval, the clamping device 40 will get stuck at the opening of the delivery sheath 50, resulting in retrieval failure.

[0054] To ensure that the clamping device 40 can be successfully retrieved, the control line 300 must be tightened before the clamping device 40 is retrieved, and the opening size of the clamping device 40 must be smaller than the inner diameter of the delivery sheath 50.

[0055] In this application, a compensation mechanism 200 is provided on the handle body 20 of the push handle 10. The compensation mechanism 200 is used to adjust the travel of the control lever 120. If the clamping instrument 40 cannot be successfully retrieved due to the control line 300 becoming loose, the travel of the control lever 120 can be adjusted by the compensation mechanism 200 to compensate for the length of the loose control line 300, thereby quickly restoring the normal operation of the clamping instrument 40 and improving surgical efficiency and success rate.

[0056] like Figures 4 to 7 As shown, the compensation mechanism 200 includes a stepping component 210 and a limiting component 220. The stepping component 210 includes a stepping positioning block 211 and a stepping retaining strip 212. The stepping positioning block 211 is connected to the sleeve 110. The stepping retaining strip 212 is axially disposed on the stepping positioning block 211, facing inward towards the sleeve 110. The stepping retaining strip 212 is used to control the movement stroke of the control lever 120. The stepping retaining strip 212 includes multiple retaining teeth 213 axially spaced on the stepping positioning block 211. The multiple retaining teeth 213 are used to engage the control lever 120 respectively, so that the control lever 120 is engaged and fixed at different strokes. The proximal end of the control lever 120 is connected to the control line 300, and the distal end of the control lever 120 is provided with an elastic buckle 130, which engages with the retaining teeth 213.

[0057] In this embodiment, as Figures 7 to 9As shown, the locking teeth 213 on the stepper bar 212 include positioning teeth 214 and compensation teeth 215. The positioning teeth 214 are located on the distal side of the stepper bar 212, and the compensation teeth 215 are located on the proximal side of the positioning teeth 214. Multiple compensation teeth 215 are provided, spaced apart. The positioning teeth 214 are used to engage the control lever 120 when the control line 300 is not loose. The multiple compensation teeth 215 are used to provide graded compensation for the movement stroke of the control lever 120 after the control line 300 becomes loose.

[0058] In this embodiment, stepping positioning blocks 211 and stepping locking strips 212 are provided on both sides of the sleeve 110, and two elastic buckles 130 are provided on the control lever 120 respectively corresponding to the stepping locking strips 212 on both sides, so as to balance the locking force on both sides.

[0059] When manipulating the clamping device 40, the control line 300 needs to be pulled proximally. For example, when the clamping device 40 is a mitral valve clamp, the control line 300 causes the clamping device 40 to open and clamp the mitral valve and other tissue structures through the hook 41. After the clamping device 40 is opened, it needs to be kept open. Then, the doctor uses the delivery device to fine-tune the position and state of the clamping device 40 so that it can accurately capture the mitral valve and other tissue structures.

[0060] As described above, after the control lever 120 pulls the control line 300 to open the clamping instrument 40, the control lever 120 needs to be axially fixed to free the doctor's hands and allow for further operation of other components of the push handle 10. This application uses positioning teeth 214 to lock and fix the control lever 120 in place. As long as the control line 300 is not loose, the control lever 120 can be locked and fixed using the positioning teeth 214.

[0061] When the control cable 300 becomes detached from the control lever 120, the actual operating length of the control cable 300 increases. In this case, the control lever 120 needs to be moved a longer distance to compensate for the detached length. After the elastic latch 130 of the control lever 120 engages with the positioning tooth 214, further moving the control lever 120 proximally allows the elastic latch 130 to engage with the compensation tooth 215. Multiple compensation teeth 215 are spaced apart axially. When the elastic latch 130 engages with different compensation teeth 215, the control lever 120 achieves compensation of different distances.

[0062] In this embodiment, the stepper bar 212 is provided with four compensation teeth 215. By setting multiple compensation teeth 215, the compensation stroke of the control lever 120 is adjusted in stages to adapt to different loosening lengths of the control line 300. This prevents the control lever 120 from pulling the control line 300 too tightly after the compensation mechanism 200 is activated, thus preventing the control line 300 from breaking or loosening further due to excessive pulling force.

[0063] The limiting component 220 is used to control the locking teeth 213 of the control lever 120 to engage with the positioning teeth 214, or to enable the locking teeth 213 of the control lever 120 to engage with the compensation teeth 215.

[0064] like Figures 10 to 15 As shown, the limiting assembly 220 includes a limiting ring 221 rotatably connected to the sleeve 110. A push handle 222 for controlling the rotation of the limiting ring 221 is provided on the outer side of the limiting ring 221, and a stop block 223 is provided on the inner side of the limiting ring 221 to limit the travel of the control lever 120. An operating hole 21 is provided on the handle body 20. After the stepping locking device 30 is assembled with the handle body 20, the push handle 222 is located within the operating hole 21 and protrudes from the handle body 20 to facilitate doctor operation.

[0065] A mounting platform 140 is provided on the outer wall of the control lever 120. The axial height of the stop block 223 is greater than the axial height of the mounting platform 140, so the stop block 223 can block the movement of the mounting platform 140 in the axial direction. A guide groove 111 is provided on the inner wall of the sleeve 110 along the axial direction. The mounting platform 140 is slidably connected to the guide groove 111. A clearance groove 112 is provided on the side of the guide groove 111 along the circumferential direction. The clearance groove 112 is adapted to the stop block 223. When the stop block 223 is located in the guide groove 111, the stop block 223 can block the movement path of the mounting platform 140; when the stop block 223 is located in the clearance groove 112, there is no obstruction in the guide groove 111, and the mounting platform 140 can continue to slide along the guide groove 111.

[0066] Specifically, the limiting ring 221 can rotate circumferentially along the sleeve 110, and the operator drives the limiting ring 221 to rotate by operating the push handle 222. When the stop block 223 is located in the guide groove 111 under the drive of the limiting ring 221, since the axial height of the stop block 223 is greater than the axial height of the mounting platform 140, the stop block 223 blocks the mounting platform 140 axially. When the mounting platform 140 moves axially towards the proximal end along the guide groove 111, it eventually stops sliding towards the proximal end due to contact with the stop block 223. At the same time, since the mounting platform 140 is mounted on the control lever 120 and the mounting platform 140 is fixedly connected to the control lever 120, the control lever 120 moves synchronously with the mounting platform 140. When the mounting platform 140 is blocked by the stop block 223 and cannot continue to slide towards the proximal end, the movement of the control lever 120 towards the proximal end is restricted.

[0067] When the mounting plate 140 abuts against the stop block 223, it engages Figure 7 As shown, the elastic latch 130 at the distal end of the control lever 120 engages with the positioning tooth 214, thereby restricting the movement of both the proximal and distal ends of the control lever 120, thus achieving axial fixation between the control lever 120 and the sleeve 110. During this process, the control line 300 provided on the control lever 120 moves axially towards the proximal end under the action of the control lever 120, causing the clamping device 40 to deform, thus completing the control of the clamping device 40.

[0068] A return groove 113 is also provided on the inner wall of the sleeve 110. The return groove 113 is arranged along the axial direction of the sleeve 110, and the return groove 113 and the guide groove 111 are spaced apart in the circumferential direction of the sleeve 110. In this embodiment, the return groove 113 and the guide groove 111 are spaced apart by 90 degrees in the circumferential direction. A rotating platform 114 is provided between the return groove 113 and the guide groove 111. The axial height of the rotating platform 114 is less than the axial height of the mounting platform 140, so that the rotating platform 114 is connected to the return groove 113 and the guide groove 111, and the mounting platform 140 can move between the return groove 113 and the guide groove 111 along the rotating platform 114.

[0069] The mounting platform 140 can rotate circumferentially along the rotating platform 114. When it is necessary to disengage the control lever 120 from its locked state, rotating the control lever 120 causes the elastic buckle 130 to disengage from the positioning tooth 213. Since the axial height of the rotating platform 114 is less than the axial height of the mounting platform 140, the movement of the mounting platform 140 is unimpeded. When rotating the control lever 120, the mounting platform 140 moves from the guide groove 111 to the return groove 113 via the rotating platform 114. When the mounting platform 140 moves into the return groove 113, the mounting platform 140 and the return groove 113 are slidably connected, and the control lever 120 can move axially. At this time, the control lever 120 can be moved to the distal end, causing the control line 300 to move towards the distal end along with the movement of the control lever 120.

[0070] Among them, a support ring 230 is provided at the proximal end of the limiting ring 221. The support ring 230 is fixedly connected to the handle body 20, the limiting ring 221 is rotatably connected to the support ring 230, and a locking part 240 is provided between the support ring 230 and the limiting ring 221.

[0071] like Figure 16 and Figure 17 As shown, the engaging portion 240 includes a stop latch 241 and an unlocking latch 242, which are respectively disposed on the inner wall of the support ring 230. The engaging portion 240 also includes a limiting member 224 disposed on the outer wall of the limiting ring 221, with the stop latch 241 and unlocking latch 242 used to respectively engage with the limiting member 224. Simultaneously, in conjunction with… Figure 11 and Figure 12 As shown, when the limiting member 224 engages with the stop member 241, the stop block 223 is located within the guide groove 111, allowing the stop block 223 to abut against the mounting platform 140 and thus restricting the movement of the control lever 120 towards the proximal end. When the limiting member 224 engages with the unlocking member 242, the stop block 223 is located within the clearance groove 112, ensuring the guide groove 111 is unobstructed, allowing the mounting platform 140 to continue moving towards the proximal end, increasing the travel of the control lever 120, and thus compensating for the length of the loosened control cable 300.

[0072] like Figure 14 As shown, the control mechanism 100 also includes a guide rod 150 passing through the sleeve 110. The guide rod 150 is coaxially arranged with the sleeve 110. The control lever 120 has a through control cavity 121 arranged along the axial direction. The control lever 120 is sleeved with the guide rod 150 through the control cavity 121, so that the control lever 120 can slide along the guide rod 150. The guide rod 150 is fixedly connected to the handle body 20 and sleeved with the control lever 120. When the control lever 120 moves along the axial direction of the sleeve 110, the guide rod 150 guides the control lever 120. In this embodiment, a sealing gasket 152 is provided between the guide rod 150 and the control lever 120.

[0073] The guide rod 150 has a through connecting cavity 151 along the axial direction, which connects the control cavity 121 and the handle body 20. The control line 300 passes through the connecting cavity 151 and the control cavity 121 sequentially from the handle body 20. The proximal end of the control line 300 is connected to the control rod 120, and the distal end of the control line 300 is connected to the clamping device 40.

[0074] Combination Figure 5 and Figure 18 As shown, an end cap 123 is provided at the proximal end of the control lever 120. The end cap 123 is detachably connected to the control lever 120. A sealing structure 400 is provided between the control lever 120 and the end cap 123. The control line 300 is connected to the sealing structure 400.

[0075] In this embodiment, a grip portion 122 is provided on the control lever 120. The operator operates the control lever 120 through the grip portion 122. A sealing structure 400 is provided at the proximal end of the grip portion 122. After the stepping locking device 30 is assembled onto the handle body 20, a sleeve 110 is disposed inside the handle body 20. The control lever 120 is slidably connected to the sleeve 110, and the grip portion 122 is located on the outside of the handle body 20 for the convenience of the doctor's operation. A scale structure 124 is also provided on the control lever 120. The scale structure 124 is axially disposed on the control lever 120, and the axial length of the scale structure 124 is the same as that of the stepping clip 212. When the control lever 120 is moved, the scale structure 124 is located outside the handle body 20 for the doctor to observe the movement stroke of the control lever 120. In this embodiment, the scale structure 124 is printed on the control lever 120 with ink. The scale structure 124 includes multiple axially arranged scale lines. When there is no need to adjust the movement stroke of the control lever 120, if a scale line is observed, it indicates that the control lever 120 has moved to the correct position. If it is necessary to compensate for the movement stroke of the control lever 120, the movement stroke of the control lever 120 can be determined by observing the multiple scale lines of the scale structure 124.

[0076] like Figures 18 to 21 As shown, the sealing structure 400 includes a sealing groove 410, a sealing ring 420, and a fixing ring 430. The sealing groove 410 is located near the control lever 120 and is arranged in a ring shape. The sealing ring 420 and the fixing ring 430 are arranged sequentially in the sealing groove 410. The fixing ring 430 is located near the sealing ring 420. The near end of the control line 300 is wrapped and fixed with the fixing ring 430.

[0077] The end cap 123 is threaded to the proximal end of the control lever 120. A notch 411 is provided at the proximal end of the sealing groove 410, through which the control line 300 is connected to the retaining ring 430. A first channel 440 is formed between the retaining ring 430 and the sidewall of the sealing groove 410, and a second channel 450 is formed between the retaining ring 430 and the sealing ring 420. The control line 300 is wound and fixed within the first channel 440 and the second channel 450, respectively.

[0078] The sealing structure 400 of this application compresses the control line 300 through the sealing ring 420, the fixing ring 430, and the end cap 123. While the end cap 123 is tightened, the inner wall of the end cap 123 compresses the fixing ring 430 and the sealing ring 420, causing the fixing ring 430 and the sealing ring 420 to undergo elastic deformation, and together they compress the control line 300, forming a continuous and stable clamping force, thus pressing and fixing the control line 300. Because the fixing ring 430 and the sealing ring 420 are compressed by the control lever 120 and the end cap 123 to form a tight sealing structure 400, the control line 300 wound inside the end cap 123 is simultaneously held in place by the clamping force and the compression of the threaded assembly, thereby ensuring that the control line 300 can be preserved for a long time without easily loosening.

[0079] In this embodiment, the control wire 300 is alternately wound and fixed within the first channel 440 and the second channel 450. During assembly, the control wire 300 is first pulled taut, then passes over the notch 411 into the first channel 440, and is wound and fixed within the first channel 440. Then, the control wire 300 passes over the outer surface of the fixing ring 430 into the second channel 450, and is wound and fixed within the second channel 450.

[0080] Specifically, when the control line 300 is wound and fixed in the first channel 440 and the second channel 450, it can be wound several times, such as 3-5 times, so that there is a certain clamping force between the control line 300 and the sealing structure 400. When the end cap 123 is tightened, the fixing ring 430 and the sealing ring 420 press the control line 300 more tightly under the pressure, so as to fix the control line 300.

[0081] Furthermore, after the control line 300 is wound and fixed in the second channel 450, the control line 300 is folded back into the first channel 440 across the outer surface of the fixing ring 430 and wound and fixed in the first channel 440 again, thereby alternately winding and fixing the control line 300 in the first channel 440 and the second channel 450, making the fixation of the control line 300 more secure and preventing the control line 300 from loosening.

[0082] After the control line 300 is wound and fixed, the end cap 123 is screwed and fixed on the control lever 120, so that the fixing ring 430 and the sealing ring 420 press against the position where the control line 300 is wound, and the control line 300 is pressed and fixed by the compressive force.

[0083] Since the control line 300 is not wrapped around the outer side of the sealing ring 420 of the sealing structure 400 of this application, the outer edge structure of the sealing ring 420 is intact. When the end cap 123 is tightened and fixed outside the sealing structure 400, the inner wall of the end cap 123 can fit tightly with the outer edge of the sealing ring 420, thereby ensuring good sealing performance. Furthermore, a fixing ring 430 is provided on the proximal side of the sealing ring 420. The control line 300 is alternately wound around the two ends of the fixing ring 430, and the end cap 123 applies a clamping force to the sealing ring 420 and the fixing ring 430, so that the control line 300 is squeezed and fixed, thereby preventing the control line 300 from loosening.

[0084] Therefore, the above technical solution can prevent the control line 300 from becoming loose while ensuring the sealing performance of the control lever 120.

[0085] The present invention also proposes a conveying system, wherein, as Figure 1 and Figure 2 As shown, it includes a push handle 10 as described above and a delivery sheath 50 connected to the handle. A clamping device 40 is disposed at the distal end of the delivery sheath 50. The clamping device 40 includes a hook 41, and a control line 300 is detachably connected to the hook 41.

[0086] The clamping device 40 can be a mitral valve clamp, and the hook 41 is used to clamp the mitral valve tissue. When the control line 300 moves proximally, it can pull the hook 41 open, thereby capturing the mitral valve tissue. When it is necessary to retrieve the clamping device 40, the control line 300 is also moved proximally. The hook 41 straightens under the pull of the control line 300, and the opening of the hook 41 is smaller than the opening of the delivery sheath 50, thereby enabling the clamping device 40 to be retrieved from the delivery sheath 50.

[0087] The above description is merely a preferred embodiment of the present invention, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A push handle, characterized in that The device includes a handle body and a stepping locking device disposed on the handle body. The stepping locking device includes a control mechanism and a compensation mechanism. The control mechanism operates the clamping device via a control line. The control mechanism includes a sleeve and a control lever slidably connected to the sleeve. The control line is detachably connected between the clamping device and the control lever. The compensation mechanism is used to adjust the travel of the control lever. The proximal end of the control lever is connected to the control line. The compensation mechanism includes a stepping component and a limiting component. The stepping component includes a stepping positioning block connected to the sleeve and a stepping retaining strip disposed axially on the stepping positioning block. The stepping retaining strip is used to engage the control lever. The limiting component is used to control the engagement between the control lever and the stepping component.

2. The push handle according to claim 1, characterized in that, The stepping bar includes a plurality of teeth spaced axially on the stepping positioning block, the plurality of teeth being used to selectively engage the control lever; the distal end of the control lever is provided with an elastic buckle, the elastic buckle being used to selectively engage with one of the plurality of teeth.

3. The push handle according to claim 2, characterized in that, The limiting assembly includes a limiting ring rotatably connected to the sleeve. A push handle for controlling the rotation of the limiting ring is provided on the outer side of the limiting ring, and a stop block is provided on the inner side of the limiting ring. The stop block is used to limit the travel of the control lever.

4. The push handle according to claim 3, characterized in that, A support ring is provided at the proximal end of the limiting ring. The support ring is fixedly connected to the handle body. The limiting ring is rotatably connected to the support ring. A locking part is provided between the support ring and the limiting ring.

5. The push handle according to claim 3, characterized in that, A mounting platform is provided on the outer wall of the control lever, and the axial height of the stop block is greater than the axial height of the mounting platform; a guide groove is provided on the inner wall of the sleeve along the axial direction, the mounting platform is slidably connected to the guide groove, and a clearance groove is provided on the side of the guide groove along the circumferential direction, the clearance groove being used to fit the stop block.

6. The push handle according to claim 5, characterized in that, The locking teeth include positioning teeth and multiple compensation teeth. The positioning teeth are disposed on the distal side of the stepping locking strip, and the multiple compensation teeth are disposed at intervals on the proximal side of the stepping locking strip. When the stop block is located in the guide groove, the elastic buckle can engage with the positioning teeth. When the stop block is located in the clearance groove, the elastic buckle can engage with one of the compensation teeth.

7. The push handle according to claim 5, characterized in that, A return groove is provided on the inner wall of the sleeve along the axial direction. The return groove and the guide groove are spaced apart in the circumferential direction of the sleeve. A rotating platform is provided between the return groove and the guide groove. The axial height of the rotating platform is less than the axial height of the mounting plate. The rotating platform is connected to the return groove and the guide groove.

8. The push handle according to claim 1, characterized in that, The control mechanism also includes a guide rod passing through the sleeve. The guide rod is coaxially arranged with the sleeve. The control lever has a through control cavity along the axial direction. The control lever is sleeved with the guide rod through the control cavity, so that the control lever can slide along the guide rod.

9. The push handle according to claim 8, characterized in that, The guide rod has a through connecting cavity along the axial direction, and the connecting cavity is connected to the interior of the control cavity and the handle body; the control line passes through the connecting cavity and the control cavity in sequence.

10. The push handle according to claim 9, characterized in that, An end cap is provided at the proximal end of the control stick. The end cap is detachably connected to the control stick. A sealing structure is provided between the control stick and the end cap. The control line is connected to the sealing structure.

11. A conveying system, characterized in that, Includes a push handle as described in any one of claims 1-10 and a delivery sheath connected to the push handle, wherein the clamping device is disposed at the distal end of the delivery sheath, the clamping device includes a hook, and the control line is detachably connected to the hook.

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