CN118252656A - Pushing handle and conveying system - Google Patents

Abstract

The invention belongs to the technical field of medical equipment, and particularly relates to a pushing handle, which comprises a handle body and a stepping locking device arranged on the handle body, wherein the stepping locking device comprises a control mechanism and a compensation mechanism; the control mechanism controls the clamping device through a control wire, the control mechanism comprises a sleeve and a control rod which is connected with the sleeve in a sliding manner, and the control wire can be connected between the clamping device and the control rod; the compensation mechanism is used for adjusting the moving stroke of the control rod. When the connecting piece is loosened, the moving stroke of the control rod can be adjusted through the compensation mechanism, so that the loosening length of the connecting piece is compensated, and the normal operation of the clamping apparatus is restored; improving the operation efficiency and success rate.

Description

Pushing handle and conveying system

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to a pushing handle and a conveying system.

Background

Mitral valve disease is a common disorder in the elderly population, including two common types of mitral regurgitation and mitral stenosis, with mitral regurgitation being the most common. The incidence of mitral regurgitation is statistically up to 10% in people older than 75 years. Slight mitral regurgitation generally has no effect on normal life, while moderate or severe mitral regurgitation requires intervention treatment, and the traditional surgical treatment mode is chest opening treatment, and under the support of an extracorporeal circulation machine, the heart is opened to repair or replace the valve, but the high-risk patient cannot tolerate the valve. In recent years, the high-risk patients with mitral regurgitation are hoped for by interventional therapy, which is generally carried out by delivering an instrument to a lesion through a catheter to repair or replace a valve.

At present, a transcatheter mitral valve repair product mostly adopts a clamping device to clamp the anterior leaflet and the posterior leaflet of a mitral valve, so that the opening area of the valve is reduced, the purpose of treating regurgitation is achieved, the clamping device is connected with a control wire, and the control wire is operated by pushing a handle to control the clamping device to capture the mitral valve leaflet.

The thread end of the control line is not easy to fix, and the thread end of the control line is easy to loosen in the long-term storage process of the product. In addition, the pulling force of the control wire can be increased when the outer sheath and the inner sheath are bent during operation, and the risk of loosening of the head end of the control wire and the operation end of the pushing handle exists. Loosening of the control wire can result in an increase in the effective length dimension of the control wire, affecting the normal operation of the clamping instrument, and in severe cases, may result in surgical failure.

Therefore, a new technical means is needed to solve the above-mentioned problems of the prior art.

Disclosure of Invention

The invention aims to at least solve the problem that the normal operation of a clamping instrument is affected due to the fact that a control wire of the existing mitral valve repair device is loosened.

The invention provides a pushing handle, which comprises a handle body and a stepping locking device arranged on the handle body, wherein the stepping locking device comprises a control mechanism and a compensation mechanism; the control mechanism controls the clamping device through a control wire, the control mechanism comprises a sleeve and a control rod which is connected with the sleeve in a sliding manner, and the control wire can be connected between the clamping device and the control rod; the compensation mechanism is used for adjusting the moving stroke of the control rod.

According to the push handle, under the condition that the connecting piece is loosened, the moving stroke of the control rod can be adjusted through the compensation mechanism, so that the loosening length of the connecting piece is compensated, and the normal operation of the clamping apparatus is restored; improving the operation efficiency and success rate.

In addition, the pushing handle according to the invention may also have the following additional technical features:

In some embodiments of the present invention, the compensation mechanism includes a step assembly and a limit assembly, where the step assembly includes a step positioning block connected to the sleeve and a step clamping bar axially disposed on the step positioning block, and the step clamping bar is used for clamping the control rod.

In some embodiments of the present invention, the step-by-step latch includes a plurality of latches axially spaced apart on the step-by-step positioning block, and the plurality of latches are used for selectively latching the control rod; the proximal end of the control rod is connected with the control wire, and the distal end of the control rod is provided with an elastic buckle, and the elastic buckle is used for being selectively matched with one clamping tooth of a plurality of clamping teeth.

In some embodiments of the present invention, the limiting assembly includes a limiting ring rotatably connected to the sleeve, a push handle for controlling the rotation of the limiting ring is disposed at an outer side of the limiting ring, and a stop block for limiting a movement stroke of the control rod is disposed at an inner side of the limiting ring.

In some embodiments of the present invention, a support ring is disposed at a 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 a clamping portion is disposed between the support ring and the limiting ring.

In some embodiments of the present invention, a hanging table is disposed on an outer wall of the control rod, and an axial height of the stop block is greater than an axial height of the hanging table; the inner wall of the sleeve is axially provided with a guide chute, the hanging table is slidably connected with the guide chute, the side surface of the guide chute is provided with a clearance groove along the circumferential direction, and the clearance groove is used for adapting to the stop block.

In some embodiments of the invention, the latch includes a positioning tooth disposed on a distal side of the step-by-step latch and a plurality of compensating teeth disposed on a proximal side of the step-by-step latch; when the stop block is positioned in the guide chute, the elastic buckle can be clamped with the positioning tooth, and when the stop block is positioned in the avoidance chute, the elastic buckle can be clamped with one compensation tooth.

In some embodiments of the present invention, a return chute is axially disposed on an inner wall of the sleeve, the return chute and the guide chute are disposed at intervals in a circumferential direction of the sleeve, a rotary platform is disposed between the return chute and the guide chute, an axial height of the rotary platform is smaller than an axial height of the hanging platform, and the rotary platform is communicated with the return chute and the guide chute.

In some embodiments of the present invention, the control mechanism further includes a guide rod penetrating through the sleeve, the guide rod is coaxially disposed with the sleeve, the control rod is axially provided with a through control cavity, and the control rod is sleeved with the guide rod through the control cavity, so that the control rod can slide along the guide rod.

In some embodiments of the present invention, the guide rod is provided with a through connecting cavity along an axial direction, and the connecting cavity is communicated with the control cavity and the interior of the handle body; the control line sequentially penetrates through the connecting cavity and the control cavity.

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

The invention also provides a conveying system, which comprises the pushing handle and a conveying sheath pipe connected with the pushing handle, wherein the clamping device is arranged at the distal end of the conveying sheath pipe, the clamping device comprises a hook buckle, and the control wire is detachably connected with the hook buckle.

Drawings

FIG. 1 is a schematic view of the whole structure of a pushing handle according to an embodiment of the present invention;

FIG. 2 is an enlarged view of the portion A of FIG. 1 in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of the internal structure of the pushing handle according to the embodiment of the present invention;

FIG. 4 is a schematic view showing an internal structure of a step lock device according to an embodiment of the present invention;

FIG. 5 is a schematic view of the overall structure of a step lock device according to an embodiment of the present invention;

FIG. 6 is a schematic view of a joystick according to an embodiment of the present invention;

FIG. 7 is a schematic view illustrating a structure of a lever in a locking manner according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of a compensation mechanism in an embodiment of the invention;

FIG. 9 is an enlarged view of FIG. 7 at C in accordance with an embodiment of the present invention;

FIG. 10 is a schematic view of a stop collar according to an embodiment of the present invention;

FIG. 11 is an assembly view of a sleeve and a stop collar according to an embodiment of the present invention;

FIG. 12 is a schematic view of a stop collar positioned in a clearance groove according to an embodiment of the present invention;

FIG. 13 is a schematic view illustrating the assembly of the push handle and the handle body according to an embodiment of the present invention;

FIG. 14 is a schematic view of the stop block in the embodiment of the invention abutting the hanging table;

FIG. 15 is an enlarged view of D of FIG. 13 in an embodiment of the invention;

FIG. 16 is a cross-sectional view at A-A of FIG. 13 in an embodiment of the invention;

FIG. 17 is an enlarged view of FIG. 15 at E in an embodiment of the invention;

FIG. 18 is a schematic view of a strainer basket in accordance with an embodiment of the present invention;

FIG. 19 is a schematic view showing the structure of a filter member in an embodiment of the present invention;

FIG. 20 is a schematic view showing the overall structure of an assembly substrate according to an embodiment of the present invention;

fig. 21 is a schematic diagram of an assembly structure of an assembly substrate according to an embodiment of the present invention.

Reference numerals

10. A pushing handle; 20. a handle body; 21. an operation hole; 30. a step locking device; 40. a clamping device; 41. a clasp; 50. a delivery sheath; 100. a control mechanism; 110. a sleeve; 111. a guide chute; 112. a clearance groove; 113. a return chute; 114. rotating the platform; 120. a control lever; 121. a control chamber; 122. a grip portion; 123. an end cap; 124. a scale structure; 130. an elastic buckle; 140. hanging a table; 150. a guide rod; 151. a connecting cavity; 152. a sealing gasket; 200. a compensation mechanism; 210. a step assembly; 211. a step positioning block; 212. step-by-step clamping strips; 213. latch teeth; 214. positioning teeth; 215. compensating teeth; 220. a limit component; 221. a limiting ring; 222. a push handle; 223. a stop block; 224. a limiting piece; 230. a support ring; 240. an engagement portion; 241. a stop clip; 242. unlocking the clamping piece; 300. a control line; 400. a sealing structure; 410. sealing grooves; 411. a notch; 420. a seal ring; 430. a fixing ring; 440. a first channel; 450. a second channel.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Although the terms first, second, third, etc. may be used herein to describe various 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 only used to distinguish one element, component, region, layer or section from another region, layer or section.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

For ease of description, the following description uses the terms "proximal" and "distal", wherein "proximal" refers to the end proximal to the operator and "distal" refers to the end distal to the operator, the phrase "axial direction" should be understood herein to mean the direction in which the interventional element is advanced and pushed out, and the direction perpendicular to the "axial direction" is defined as the "radial direction".

In a first embodiment, as shown in fig. 1 to 4, the push handle 10 includes a handle body 20 and a step locking device 30 disposed on the handle body 20, wherein the step locking device 30 includes a control mechanism 100 and a compensation mechanism 200, the control mechanism 100 and the compensation mechanism 200 are respectively disposed on the handle body 20, and the control mechanism 100 controls the clamping device 40 through a control wire 300. The control mechanism 100 includes a sleeve 110 and a control rod 120, the control rod 120 is slidably connected in the sleeve 110, and the sleeve 110 is fixedly disposed in the handle body 20.

One end of the control wire 300 is connected to the clamping device 40, and the other end of the control wire 300 is connected to the control rod 120, and when the clamping device 40 needs to be operated, the control rod 120 is pushed and pulled to drive the control wire 300 to move, so that the clamping device 40 is operated. Wherein, the material of the control wire 300 is polyethylene, PET, e-PTFE or PTFE wire.

Since the clamping instrument 40 will remain in the body after the operation is completed and the control wire 300 for manipulating the clamping instrument 40 needs to be recovered, the control wire 300 needs to be detachably connected to the control rod 120 and the clamping instrument 40. When it is desired to recover the control wire 300, the operator separates the proximal end of the control wire 300 from the lever 120 and then withdraws the control wire 300 from the handle body 20.

Because the control wire 300 is detachably connected with the control rod 120, the pulling force on the control wire 300 is increased when the conveying sheath 50 is bent during operation, and in addition, when the product is packaged in a shelf, the conveying sheath 50 is always in a bent state, and the pulling force on the control wire 300 is also increased when the conveying sheath 50 is bent for a long time. The increase in the pulling force of the control wire 300 causes sliding movement of the portion of the control wire 300 detachably connected to the lever 120, thereby increasing the effective length of the control wire 300. If the control wire 300 is released from the connection portion of the control lever 120, normal operation is affected.

In the prior art, the control wire is usually taken down from the control rod, the control wire is tensioned and then is connected with the control rod again, and then the operation is restarted, so that the operation time and the operation difficulty are greatly increased by adopting the solution.

In addition, if the clamping instrument 40 is found to catch, wind up, etc. the tendon while the clamping instrument 40 is not performing the extraction control line 300 and the release action, the clamping instrument 40 may be straightened to disengage the tendon from winding and re-working during the surgical procedure. Or the clamping device 40 needs to be replaced, the clamping device 40 can be straightened and recovered, and withdrawn from the body for replacement. As shown in fig. 2, when the clipping device 40 is recovered, if the opening size is larger than the inner diameter of the delivery sheath 50, the clipping device 40 will be jammed at the orifice of the delivery sheath 50, resulting in recovery failure.

In order to ensure that the clamping instrument 40 is successfully retrieved, it is necessary to ensure that the control wire 300 is tensioned before retrieval of the clamping instrument 40, the opening of the clamping instrument 40 being smaller in size than the inner diameter of the delivery sheath 50.

In the present application, the handle body 20 of the push handle 10 is provided with the compensation mechanism 200, and the compensation mechanism 200 is used for adjusting the movement stroke of the lever 120. If the clamping device 40 cannot be successfully recovered due to the loosening of the control wire 300, the moving stroke of the control rod 120 can be adjusted through the compensation mechanism 200, so that the loosening length of the control wire 300 is compensated, the normal operation of the clamping device 40 can be quickly recovered, and the operation efficiency and the success rate are improved.

As shown in fig. 4 to 7, the compensation mechanism 200 includes a step assembly 210 and a limit assembly 220, the step assembly 210 includes a step positioning block 211 and a step clamping bar 212, the step positioning block 211 is connected to the sleeve 110, the step clamping bar 212 is axially disposed on the step positioning block 211, the step clamping bar 212 is disposed towards the inner direction of the sleeve 110, and the step clamping bar 212 is used for controlling the movement stroke of the control lever 120. The step clamping bar 212 includes a plurality of clamping teeth 213 disposed on the step positioning block 211 along an axial direction at intervals, and the plurality of clamping teeth 213 are used for respectively clamping the operating rod 120, so that the operating rod 120 is clamped and fixed on different strokes. The proximal end of the control rod 120 is connected to the control wire 300, and the distal end of the control rod 120 is provided with an elastic buckle 130, where the elastic buckle 130 is engaged with the latch 213.

In this embodiment, as shown in fig. 7 to 9, the latch 213 on the step-up latch 212 includes positioning teeth 214 and compensating teeth 215, the positioning teeth 214 are disposed on the distal end side of the step-up latch 212, the compensating teeth 215 are disposed on the proximal end side of the positioning teeth 214, the compensating teeth 215 are plural, and the plural compensating teeth 215 are disposed at intervals. The positioning teeth 214 are used for clamping the control rod 120 when the control wire 300 is not loosened. The plurality of compensating teeth 215 are used for performing graded compensation on the movement stroke of the lever 120 after the control wire 300 is loosened.

In this embodiment, the two sides of the sleeve 110 are provided with the step positioning block 211 and the step clamping strip 212, and the operation lever 120 is provided with two elastic buckles 130 corresponding to the step clamping strips 212 respectively, so as to balance the clamping forces of the two sides.

When the clamping device 40 is manipulated, the control wire 300 needs to be pulled proximally, for example, when the clamping device 40 is a mitral valve clamp, the control wire 300 enables the clamping device 40 to open and clamp tissue structures such as a mitral valve through the clasp 41. When the clamping device 40 is opened, the clamping device 40 needs to be kept in an opened state, and then a doctor fine-adjusts the position and the state of the clamping device 40 through a conveying device, so that the clamping device 40 can accurately capture tissue structures such as mitral valves and the like.

From the above, after the control rod 120 is moved to pull the control wire 300 to open the clamping apparatus 40, the control rod 120 needs to be axially fixed, so that the doctor releases both hands, and further operates other components of the push handle 10. The application is characterized in that the positioning teeth 214 are used for clamping and fixing the control rod 120, and the control rod 120 is clamped and fixed by the positioning teeth 214 under the condition that the control wire 300 is not loosened.

When the control wire 300 and the control lever 120 are released, the actual control length of the control wire 300 is increased, and the control lever 120 needs to be moved a longer distance to compensate for the release length of the control wire 300. After the elastic buckle 130 of the control rod 120 is clamped with the positioning teeth 214, the control rod 120 is further moved proximally, so that the elastic buckle 130 is clamped with the compensation teeth 215, a plurality of compensation teeth 215 are axially arranged at intervals, and when the elastic buckle 130 is clamped with different compensation teeth 215, the control rod 120 realizes compensation of different distances.

In this embodiment, four compensating teeth 215 are disposed on the step-by-step clamping bar 212, and the compensating teeth 215 are disposed to adjust the compensating stroke of the control rod 120 in a grading manner, so as to adapt to different releasing lengths of the control wire 300, avoid the control rod 120 from pulling the control wire 300 too tightly after the compensating mechanism 200 is opened, and prevent the control wire 300 from breaking or further releasing due to too large pulling force.

The limiting assembly 220 is used for controlling the latch 213 of the lever 120 to be engaged with the positioning teeth 214, or enabling the latch 213 of the lever 120 to be engaged with the compensating teeth 215.

As shown in fig. 10 to 15, 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 at the outer side of the limiting ring 221, and a stop block 223 is provided at the inner side of the limiting ring 221, wherein the stop block 223 is used for limiting the movement stroke of the lever 120. The handle body 20 is provided with an operation hole 21, after the step locking device 30 is assembled with the handle body 20, the push handle 222 is positioned in the operation hole 21, and the push handle 222 protrudes out of the handle body 20, so that the operation of a doctor is facilitated.

The hanging table 140 is provided on the outer wall of the manipulation lever 120, and the axial height of the stopper 223 is greater than that of the hanging table 140, so that the stopper 223 can block the hanging table 140 from moving in the axial direction. The inner wall of the sleeve 110 is axially provided with a guide chute 111, the hanging table 140 is slidably connected to the guide chute 111, the side surface of the guide chute 111 is circumferentially provided with a clearance groove 112, and the clearance groove 112 is matched with the stop block 223. When the stopper 223 is positioned in the guide chute 111, the stopper 223 can block the moving path of the hooking stage 140; when the stop block 223 is located in the avoidance slot 112, the guide chute 111 is unobstructed, so that the hanging table 140 can slide along the guide chute 111.

Specifically, the stop ring 221 may rotate in the circumferential direction of the sleeve 110, and an operator may rotate the stop ring 221 by operating the push handle 222. When the stop block 223 is located in the guide chute 111 under the driving of the stop ring 221, the stop block 223 is larger than the axial height of the hanging table 140, so that the stop block 223 can block the hanging table 140 in the axial direction, and when the hanging table 140 moves along the guide chute 111 in the proximal axial direction, the hanging table cannot slide further in the proximal direction due to abutting against the stop block 223. Meanwhile, since the hanging table 140 is disposed on the manipulation lever 120 and the hanging table 140 is fixedly connected with the manipulation lever 120, the manipulation lever 120 and the hanging table 140 move synchronously. Proximal movement of lever 120 is limited when hanging piece 140 is blocked from further proximal sliding movement by stop block 223.

When the hanging table 140 abuts against the stop block 223, as shown in fig. 7, the elastic buckle 130 at the distal end of the control rod 120 is engaged with the positioning tooth 214, so that the movement of the proximal end and the distal end of the control rod 120 is limited, and further the fixation of the control rod 120 and the sleeve 110 in the axial direction is realized. In this process, the control wire 300 disposed on the control rod 120 is driven by the control rod 120 to move axially and proximally, and drives the clamping device 40 to deform, so as to complete the operation of the clamping device 40.

The inner wall of the sleeve 110 is also provided with a return chute 113, the return chute 113 is arranged along the axial direction of the sleeve 110, and the return chute 113 and the guide chute 111 are arranged at intervals in the circumferential direction of the sleeve 110. In the present embodiment, the return chute 113 is disposed at a 90-degree interval in the circumferential direction from the guide chute 111. A rotating platform 114 is arranged between the return chute 113 and the guide chute 111, and the axial height of the rotating platform 114 is smaller than that of the hanging platform 140, so that the rotating platform 114 is communicated with the return chute 113 and the guide chute 111, and the hanging platform 140 can move between the return chute 113 and the guide chute 111 along the rotating platform 114.

When the lever 120 is required to be separated from the locking state, the lever 120 is rotated to separate the elastic buckle 130 from the positioning latch 213, and the axial height of the rotary platform 114 is smaller than that of the hanging platform 140, so that the movement of the hanging platform 140 is not blocked, and the hanging platform 140 moves from the guide chute 111 to the return chute 113 through the rotary platform 114 when the lever 120 is rotated. When the hanging table 140 moves into the return chute 113, the hanging table 140 is slidably connected with the return chute 113, and the lever 120 can move in the axial direction. At this time, the lever 120 may be moved distally such that the control wire 300 moves distally with the movement of the lever 120.

Wherein, the proximal end of the limiting ring 221 is provided with a supporting ring 230, the supporting ring 230 is fixedly connected with the handle body 20, the limiting ring 221 is rotationally connected with the supporting ring 230, and a clamping part 240 is arranged between the supporting ring 230 and the limiting ring 221.

As shown in fig. 16 and 17, the engaging portion 240 includes a locking clip 241 and an unlocking clip 242, and the locking clip 241 and the unlocking clip 242 are respectively disposed on the inner wall of the support ring 230. The engaging portion 240 further includes a limiting member 224 disposed on an outer wall of the limiting ring 221, and the locking member 241 and the unlocking member 242 are used for respectively engaging the limiting member 224. As shown in fig. 11 and 12, when the limiting member 224 is engaged with the stop member 241, the stop block 223 is located in the guide chute 111, so that the stop block 223 can abut against the hanging table 140 to limit the proximal movement of the lever 120. When the limiting member 224 is clamped with the unlocking clamping member 242, the stop block 223 is located in the avoidance slot 112 to enable the guide chute 111 to be smooth, so that the hanging table 140 can continue to move proximally, the moving stroke of the control rod 120 is increased, and the length of the loosened control wire 300 is further compensated.

As shown in fig. 14, the control mechanism 100 further includes a guide rod 150 penetrating through the sleeve 110, the guide rod 150 is coaxially disposed with the sleeve 110, the control rod 120 is axially provided with a through control cavity 121, and the control rod 120 is sleeved with the guide rod 150 through the control cavity 121, so that the control rod 120 can slide along the guide rod 150. The guide rod 150 is fixedly connected with the handle body 20 and is sleeved with the control rod 120, and when the control rod 120 moves along the axial direction of the sleeve 110, the guide rod 150 plays a guiding role on the control rod 120. In the present embodiment, a sealing gasket 152 is provided between the guide bar 150 and the lever 120.

The guide rod 150 is provided with a through connection chamber 151 in the axial direction, and the connection chamber 151 communicates with the manipulation chamber 121 and the inside of the handle body 20. The control wire 300 sequentially passes through the connecting cavity 151 and the control cavity 121 in the handle body 20, the proximal end of the control wire 300 is connected with the control rod 120, and the distal end of the control wire 300 is connected with the clamping device 40.

Referring to fig. 5 and 18, an end cap 123 is disposed at a proximal end of the control rod 120, the end cap 123 is detachably connected to the control rod 120, a sealing structure 400 is disposed between the control rod 120 and the end cap 123, and the control wire 300 is connected to the sealing structure 400.

In this embodiment, the handle 120 is provided with a grip 122, and an operator operates the handle 120 through the grip 122, and the sealing structure 400 is disposed at the proximal end of the grip 122. After the step locking device 30 is assembled on the handle body 20, the sleeve 110 is disposed inside the handle body 20, the lever 120 is slidably connected to the sleeve 110, and the grip 122 is located outside the handle body 20, so as to be convenient for a doctor to operate. The control rod 120 is further provided with a graduated scale structure 124, the graduated scale structure 124 is axially arranged on the control rod 120, the axial length of the graduated scale structure 124 is the same as that of the stepping clamping strip 212, and when the control rod 120 is moved, the graduated scale structure 124 is positioned outside the handle body 20 and used for observing the movement stroke of the control rod 120 by a doctor. In this embodiment, the scale structure 124 is printed on the lever 120 by ink. The scale structure 124 includes a plurality of scale marks disposed axially, and when the movement stroke of the lever 120 is not required to be adjusted, if one scale mark is observed, it indicates that the lever 120 moves into place; if compensation is required for the movement stroke of the joystick 120, the movement stroke of the joystick 120 is determined by observing the plurality of graduation marks of the graduation structure 124.

As shown in fig. 18 to 21, the sealing structure 400 includes a sealing groove 410, a sealing ring 420 and a fixing ring 430, the sealing groove 410 is disposed at the proximal end of the control rod 120, the sealing groove 410 is disposed in a ring shape, the sealing ring 420 and the fixing ring 430 are sequentially disposed in the sealing groove 410, the fixing ring 430 is disposed at the proximal end side of the sealing ring 420, and the proximal end of the control wire 300 is wound and fixed with the fixing ring 430.

The end cap 123 is screwed to the proximal end of the lever 120, the proximal end of the sealing groove 410 is provided with a notch 411, and the control wire 300 is connected to the fixing ring 430 through the notch 411. Wherein, a first channel 440 is formed between the fixing ring 430 and the side wall of the sealing groove 410, and a second channel 450 is formed between the fixing ring 430 and the sealing ring 420. The control wire 300 is wound around and secured within the first channel 440 and the second channel 450, respectively.

According to the sealing structure 400 disclosed by the application, the control wire 300 is extruded through the sealing ring 420, the fixing ring 430 and the end cover 123, and when the end cover 123 is screwed and fixed, the inner wall of the end cover 123 extrudes the fixing ring 430 and the sealing ring 420, so that the fixing ring 430 and the sealing ring 420 elastically deform and extrude the control wire 300 together to form a continuous and stable pressing force, and the control wire 300 is pressed and fixed. Since the fixing ring 430 and the sealing ring 420 are pressed by the operating rod 120 and the end cap 123 to form the tight sealing structure 400, the control wire 300 wound inside the end cap 123 is kept fixed while depending on the clamping force and the pressing of the screw assembly, thereby ensuring that the control wire 300 is stored for a long period of time without being easily loosened.

In this embodiment, the alternating windings of the control wire 300 are secured within the first channel 440 and the second channel 450. When assembled, the control wire 300 is first pulled tightly, then enters the first channel 440 across the notch 411, and is wound and fixed in the first channel 440. The control wire 300 is then passed over the outer surface of the retainer ring 430 into the second channel 450 and wound around and secured within the second channel 450.

Specifically, when the control wire 300 is wound around and fixed to the first channel 440 and the second channel 450, it may be wound around several turns, for example, 3-5 turns, so that a certain clamping force is provided between the control wire 300 and the sealing structure 400, and when the end cap 123 is screwed, the fixing ring 430 and the sealing ring 420 press the control wire 300 tightly under the condition of being pressed, so as to fix the control wire 300.

Further, after the control wire 300 is wound and fixed in the second channel 450, the control wire 300 is folded back into the first channel 440 across the outer surface of the fixing ring 430, and is wound and fixed again in the first channel 440, so that the control wire 300 is alternately wound and fixed in the first channel 440 and the second channel 450, the fixation of the control wire 300 is more firm, and the control wire 300 is prevented from loosening.

After the control wire 300 is wound and fixed, the end cover 123 is screwed and fixed on the control rod 120, so that the fixing ring 430 and the sealing ring 420 squeeze the winding position of the control wire 300, and the control wire 300 is pressed and fixed by the squeezing force.

Because the control wire 300 is not wound on the outer side of the sealing ring 420 of the sealing structure 400, the outer edge structure of the sealing ring 420 is complete, and when the end cover 123 is screwed and fixed outside the sealing structure 400, the inner wall of the end cover 123 can be tightly attached to the outer edge of the sealing ring 420, so that good sealing performance is ensured. And, a fixing ring 430 is provided at the proximal end side of the sealing ring 420, the control wire 300 is alternately wound at both ends of the fixing ring 430, and a pressing force is applied to the sealing ring 420 and the fixing ring 430 through the end cap 123, so that the control wire 300 is pressed and fixed, thereby preventing the control wire 300 from being loosened.

Therefore, by the above technical scheme, the control wire 300 can be prevented from being loosened while the sealing performance of the control lever 120 is ensured.

The invention also proposes a delivery system, wherein, as shown in fig. 1 and 2, the delivery system comprises a pushing handle 10 and a delivery sheath 50 connected to the handle, a clamping device 40 is arranged at the distal end of the delivery sheath 50, the clamping device 40 comprises a clasp 41, and a control wire 300 is detachably connected with the clasp 41.

Wherein the clamping instrument 40 may be a mitral valve clamp, and the clasp 41 is used to clamp mitral valve tissue. As the control wire 300 is moved proximally, the retractor catch 41 can be pulled open, thereby capturing mitral valve tissue. When it is desired to retrieve the clamping instrument 40, the control wire 300 is also moved proximally, the clasp 41 straightens under the pulling action of the control wire 300, and the opening of the clasp 41 is smaller than the opening of the delivery sheath 50, thereby enabling the clamping instrument 40 to be retrieved from the delivery sheath 50.

The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (12)

1. The pushing handle is characterized by comprising a handle body and a stepping locking device arranged on the handle body, wherein the stepping locking device comprises an operation mechanism and a compensation mechanism; the control mechanism controls the clamping device through a control wire, the control mechanism comprises a sleeve and a control rod which is connected with the sleeve in a sliding manner, and the control wire can be connected between the clamping device and the control rod; the compensation mechanism is used for adjusting the moving stroke of the control rod.

2. The pushing handle of claim 1, wherein the compensation mechanism comprises a step assembly and a limit assembly, the step assembly comprises a step positioning block connected to the sleeve and a step clamping bar axially disposed on the step positioning block, and the step clamping bar is used for clamping the control rod.

3. The pushing handle according to claim 2, wherein the step-by-step clamping bar comprises a plurality of clamping teeth axially spaced on the step-by-step positioning block, the plurality of clamping teeth being for selectively clamping the lever; the proximal end of the control rod is connected with the control wire, and the distal end of the control rod is provided with an elastic buckle, and the elastic buckle is used for being selectively matched with one clamping tooth of a plurality of clamping teeth.

4. A push handle according to claim 3, wherein the limit assembly comprises a limit ring rotatably connected to the sleeve, a push handle for controlling rotation of the limit ring is provided on an outer side of the limit ring, and a stop block is provided on an inner side of the limit ring for limiting a movement stroke of the lever.

5. The pushing handle according to claim 4, wherein a supporting ring is provided at a proximal end of the limiting ring, the supporting ring is fixedly connected with the handle body, the limiting ring is rotatably connected with the supporting ring, and a clamping portion is provided between the supporting ring and the limiting ring.

6. The pushing handle according to claim 4, wherein a hanging table is arranged on the outer wall of the control rod, and the axial height of the stop block is larger than that of the hanging table; the inner wall of the sleeve is axially provided with a guide chute, the hanging table is slidably connected with the guide chute, the side surface of the guide chute is provided with a clearance groove along the circumferential direction, and the clearance groove is used for adapting to the stop block.

7. The push handle of claim 6, wherein the latch comprises a positioning tooth disposed on a distal side of the step bar and a plurality of compensating teeth disposed on a proximal side of the step bar; when the stop block is positioned in the guide chute, the elastic buckle can be clamped with the positioning tooth, and when the stop block is positioned in the avoidance chute, the elastic buckle can be clamped with one compensation tooth.

8. The pushing handle according to claim 6, wherein a return chute is axially arranged on the inner wall of the sleeve, the return chute and the guide chute are circumferentially arranged at intervals, a rotary platform is arranged between the return chute and the guide chute, the axial height of the rotary platform is smaller than that of the hanging platform, and the rotary platform is communicated with the return chute and the guide chute.

9. The pushing handle according to claim 1, wherein the control mechanism further comprises a guide rod penetrating through the sleeve, the guide rod is coaxially arranged with the sleeve, a through control cavity is axially arranged on the control rod, the control rod is sleeved with the guide rod through the control cavity, and therefore the control rod can slide along the guide rod.

10. The pushing handle according to claim 9, wherein the guide rod is provided with a through connecting cavity along the axial direction, and the connecting cavity is communicated with the control cavity and the interior of the handle body; the control line sequentially penetrates through the connecting cavity and the control cavity.

11. The push handle of claim 10, wherein the proximal end of the lever is provided with an end cap detachably connected to the lever, a sealing structure is provided between the lever and the end cap, and the control wire is connected to the sealing structure.

12. A delivery system comprising a push handle according to any one of claims 1-11 and a delivery sheath connected to the push handle, the gripping device being disposed at a distal end of the delivery sheath, the gripping device comprising a clasp, the control wire being detachably connected to the clasp.