Pusher and clamping system

Abstract

The utility model discloses a pusher and clamping system, including push handle, push sheath tube, push shaft and drive module, drive module is connected with push handle, push sheath tube near end extends into push handle and is fixed relative to push handle, push sheath tube near end is fixed relative to push handle. The pushing shaft can be axially and movably arranged in the pushing sheath tube, and the near end of the pushing shaft is connected with the driving module; the driving module comprises a moving assembly and a driving knob used for driving the moving assembly to axially move, the moving assembly comprises a threaded driving column, a safety key and a releasing assembly, in the first direction, the safety key can be radially inserted into the threaded driving column and the releasing assembly at the same time to enable the threaded driving column and the releasing assembly to be relatively fixed, and in the direction, the safety key is locked. The safety key can be at least separated from the release assembly; and in the second direction, the threaded driving column and the releasing assembly are relatively fixed, the safety key is in a locking state, and in the locking state, the safety key cannot be separated from the threaded driving column and the releasing assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of interventional medical devices, in particular to a pusher and a clamping system. Background Art

[0002] Mitral valve disease is a common disease among the elderly, including two common types: mitral regurgitation and mitral stenosis, of which mitral regurgitation is the most common. According to statistics, the incidence of mitral regurgitation in people over 75 years old is as high as 10%. Mild mitral regurgitation generally has no effect on normal life, while moderate to severe or severe mitral regurgitation requires interventional treatment. Traditional surgical treatment is open-chest treatment, which opens the heart with the support of an extracorporeal circulation machine to repair or replace the valve, but high-risk patients cannot tolerate it. The rise of interventional treatment in recent years has brought hope to high-risk patients with mitral regurgitation. Interventional treatment generally involves delivering the device to the lesion site through a catheter to repair or replace the valve.

[0003] Currently, most transcatheter mitral valve replacement products are in the clinical research stage, and transcatheter mitral valve repair products that are currently on the market include MitraClip produced by Abbott and Pascal produced by Edwards. The principle of both is to use a mitral valve clamp to clamp the anterior and posterior leaflets of the mitral valve to reduce the valve opening area, thereby achieving the purpose of treating reflux. MitraClip uses a mechanically locked mitral valve clamp that achieves a stable clamping effect through mechanical locking. Pascal uses an elastic clamping method to clamp the leaflets between the elastic clamping arm and the flexible spacer, relieving the stress of the leaflet clamping and reducing leaflet damage. But whether it is Abbott's MitraClip or Edwards' MitraClip, they both have the common feature that the distal end of the pusher needs to be detachably connected to the mitral valve clip. The purpose is to open the clamp on the one hand, and to be detachable and release it after the clamp is completed on the other hand. Therefore, for the pusher, it is crucial to ensure the effectiveness of the connection between the mitral valve clip and the pusher during the clamping operation. If the mitral valve clip is detached and control is lost before release, it will cause serious medical accidents. Utility Model Content

[0004] Based on this, the utility model proposes a clamp and a clamping system, which are intended to ensure effective connection between the clamp and the pusher before release to prevent accidental separation.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a pusher, comprising a push handle, a push sheath, a push shaft and a drive module, wherein the drive module is connected to the push handle, the proximal end of the push sheath extends into the push handle and is relatively fixed to the push handle, the push shaft is axially movable in the push sheath and is connected to the drive module; the drive module comprises a moving component and a driving knob for driving the moving component to move axially, the moving component comprises a threaded driving column, a safety key and a release component, the driving knob is rotatably connected to the push handle, the threaded driving column is penetrated in the driving knob and is threadedly connected to the driving knob, the distal end of the release component extends into the threaded driving column, passes through The pushing shaft of the pushing handle passes through the driving knob and the threaded driving column and is fixedly connected to the releasing assembly; in a first position, the safety key can be radially inserted into the threaded driving column and the releasing assembly at the same time to make the threaded driving column and the releasing assembly relatively fixed, and in this position, the safety key can at least be disengaged from the releasing assembly to release the relative fixation of the threaded driving column and the releasing assembly; when the safety key is radially inserted into the threaded driving column and the releasing assembly at the same time and rotated to the second position, the threaded driving column and the releasing assembly are relatively fixed and the safety key is in a locked state, in which the safety key cannot be disengaged from the threaded driving column and the releasing assembly.

[0007] In one embodiment, when the safety key is in a locked state, the safety key can only be rotated from the second position to the first position under the action of an external force to prevent misoperation.

[0008] In one embodiment, the release assembly includes a fixing seat that can be extended into the proximal end of the threaded drive column and a release knob fixedly connected to the proximal end of the fixing seat. The fixing seat is axially provided with a fixing through hole for the proximal end of the push shaft to be extended into, and the proximal end of the push shaft passes through the fixing through hole and is fixed relative to the fixing seat.

[0009] In one embodiment, the safety key includes a hand-held portion and an insertion portion, the insertion portion includes a first insertion portion connected to the hand-held portion and a second insertion portion connected to the first insertion portion, the first insertion portion is cylindrical, the diameter of the first insertion portion is D1, two opposite surfaces of the second insertion portion in the circumferential direction are planes, and the other two opposite surfaces are arc surfaces connecting the two planes, the maximum radial spacing between the two arc surfaces is D2, and D2 is greater than D1, so that two hanging platforms are formed on both sides of the second insertion portion;

[0010] The threaded drive column and the fixing seat are respectively provided with a first plug hole and a second plug hole, and radially protruding locking portions are provided on both sides of the first plug hole;

[0011] In the first position, the insertion portion can be radially inserted into the first insertion hole and the second insertion hole at the same time, and when the safety key is rotated to the second position, the two hanging platforms are rotated to abut against the two locking portions respectively to form radial limitation.

[0012] In one embodiment, the axial length of the second insertion portion is H1; the second insertion hole on the fixing seat and the fixing through hole are connected, and the distance between the abutment surface of the locking portion and the pushing shaft located in the fixing through hole is H2, and H1 is greater than H2.

[0013] In one embodiment, the radial distance between the two planes is T1, the radial distance between the two locking portions is T2, and T2 is greater than T1.

[0014] In one of the embodiments, in the first orientation, the safety key can only be disengaged from at least the release assembly under the action of an external force.

[0015] In one embodiment, the insertion portion also includes a third insertion portion connected between the hand-held portion and the first insertion portion, the third insertion portion is cylindrical, and the diameter of the third insertion portion is D3; the threaded drive column is also provided with a third socket coaxial with the first socket and through-set, the aperture of the third socket is d3, and D3 is larger than d3, so that the third insertion portion and the third socket have an interference fit.

[0016] In one embodiment, the d3 is greater than the D2.

[0017] The utility model also provides a clamping system, comprising a clamping device and the above-mentioned pusher, wherein the clamping device is detachably connected to the distal end of the pusher.

[0018] The pusher and clamping system of the utility model has a safety key which can realize relative fixation of the threaded drive column and the release assembly in the first position, and is self-locking in the second position. In the self-locking state, the safety key cannot be separated from the threaded drive column and the release assembly, and double insurance is provided to effectively ensure the reliability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of an exemplary clamp and pusher of the present invention when connected;

[0020] Figure 2 It is a schematic diagram of the clamp opening when the clamp and the pusher are connected according to an exemplary embodiment of the present invention;

[0021] Figure 3 It is a partial schematic diagram of the safety key of the pusher of the utility model in the first position;

[0022] Figure 4 It is a partial schematic diagram of the exemplary pusher of the utility model when the safety key is pulled out in the first position;

[0023] Figure 5 It is a partial schematic diagram of the safety key of the pusher of the utility model in the second position;

[0024] Figure 6 It is a partial explosion schematic diagram of an exemplary pusher of the utility model;

[0025] Figure 7 Schematic diagram of an exemplary safety key of the present utility model; wherein, Figure 7 (a) is a stereoscopic view of a safety key, (b) is a schematic view from a first viewing angle, and (c) is a schematic view from a second viewing angle;

[0026] Figure 8(a) to Figure 8(c) It is a schematic diagram of an exemplary threaded drive column of the present utility model;

[0027] Figure 9(a) to Figure 9(c) A schematic diagram of an exemplary release assembly of the present invention;

[0028] Fig.10 This is a partial cross-sectional view of the connection between the push shaft and the fixing seat of the utility model;

[0029] Figure 11(a) to Figure 11(c) This is a schematic diagram of an exemplary safety key of the present utility model in a second position;

[0030] Figure 12(a) to Figure 12(c) This is a schematic diagram of an exemplary safety key of the present utility model in a first position. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0032] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0033] Although the terms first, second, third, etc. can be used in the text 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 can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0034] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0035] In addition, it should be noted that in the field of interventional medical devices, the end of a medical device implanted in a human or animal body or a delivery device that delivers the medical device that is closer to the operator is generally called the "proximal end", and the end farther from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of a medical device or delivery device are defined based on this principle. "Axial" generally refers to the length direction of the medical device when it is being delivered, and "radial" generally refers to the direction of the medical device that is perpendicular to its "axial direction", and the "axial" and "radial" of any component of a medical device are defined based on this principle.

[0036] Reference Figure 1 and Figure 2 As shown, the utility model exemplarily provides a pusher 20, the distal end of which can be detachably connected to the clamp 10. The pusher shaft 23 in the pusher 20 of this embodiment can at least move along the delivery channel toward the distal end under the drive of the drive module 24, so as to open the clamp 10 detachably connected to the distal end of the pusher 20. The proximal side of the pusher sheath 22 is relatively fixed to the pusher handle 21, and the distal side is detachably connected to the clamp 10. As an example, Figure 1 As shown, a hook seat 221 is provided on the distal side of the push sheath 22, and the hook seat 221 is detachably connected to the hanging base 12 of the clamp 10. The push sheath 22 constructs an effective channel for the pusher 20 to control the clamp 10. The push shaft 23 is a driving rod for the opening and closing of the clamp 10, which is used to control the opening and closing of the clamp assembly 14 of the clamp 10. The distal end of the push shaft 23 is threadedly connected to the release seat 13 of the clamp 10, and the two can be separated and released. The pusher 20 can be used to push, capture, close, recycle and release the clamp 10, etc. It is understandable that the functions to be realized by the pusher 20 can be set according to specific needs. Among them, Figure 1 The clamp 10 is shown in a non-opened state when the clamp 10 is connected to the pusher 20 . Figure 2 The figure shows the state of the adapter 10 being in an open state when the clamp 10 is connected to the pusher 20. Figure 2 The opening angle of the two relative clamping parts in the clamping assembly 14 of the clamp 10 is about 60° to 150°. When the clamp 10 enters the left atrium, the driving knob 241 is rotated to make the moving assembly 242 move axially, thereby driving the push shaft 23 connected thereto to move, thereby making the clamping arms 1411 and the support arms 1412 in the clamping part open, and the opening angle of the support arms 1412 on the left and right sides is about 60° to 150°. At this time, the clamp 10 can be sent into the left ventricle and then retreated into the valve waiting area.

[0037] like Figure 1 and Figure 2The pusher 20 includes a push handle 21, a push sheath 22, a push shaft 23 and a drive module 24. The drive module 24 is connected to the push handle 21. The proximal end of the push sheath 22 extends into the push handle 21 and is relatively fixed to the push handle 21. The push shaft 23 is axially movable in the push sheath 22 and the proximal end of the push shaft 23 is connected to the drive module 24. The drive module 24 includes a moving component 242 and a driving knob 241 for driving the moving component 242 to move axially. The driving assembly 242 includes a threaded driving column 2421, a safety key 2422 and a release assembly 2423. The driving knob 241 is rotatably connected to the proximal end of the pushing handle 21. The threaded driving column 2421 is sleeved in the driving knob 241 and is threadedly connected to the driving knob 241. The distal end of the release assembly 2423 extends into the threaded driving column 2421, and the pushing shaft 23 that passes through the pushing handle 21 passes through the driving knob 241 and the threaded driving column 2421 and is fixedly connected to the release assembly 2423.

[0038] Reference Figure 3 and Figure 5 The pusher 20 of this embodiment is in a first position (exemplarily, as Figure 3 and Figure 5 The safety key 2422 can be radially inserted into the threaded drive column 2421 and the release assembly 2423 at the same time to make the threaded drive column 2421 and the release assembly 2423 relatively fixed, and in this position, as shown in FIG. Figure 4 As shown, the safety key 2422 can at least be separated from the release assembly 2423, so that the threaded drive column 2421 and the release assembly 2423 are released from relative fixation; when the safety key 2422 is radially inserted into the threaded drive column 2421 and the release assembly 2423 at the same time and rotated to the second orientation (exemplarily, as shown in FIG. Figure 3 and Figure 5 ), the threaded drive column 2421 and the release assembly 2423 are relatively fixed and the safety key 2422 is in a locked state, in which the safety key 2422 cannot be separated from the threaded drive column 2421 and the release assembly 2423. It should be noted that in this embodiment Figure 3 and Figure 5 The X-direction and Y-direction shown in the figure are only exemplary descriptions of the first and second directions, and are not limited thereto. In addition, since the second direction is caused by rotation after being in the first direction, the angle between the two directions is not limited to the following. Figure 3 and Figure 5 The 90° shown may be any angle.

[0039] See also Figure 6As shown, for ease of assembly, the release assembly 2423 includes a fixing seat 24231 that can be extended into the proximal end of the threaded drive column 2421 and a release knob 24232 fixedly connected to the proximal end of the fixing seat 24231. The fixing seat 24231 is axially provided with a fixing through hole 24231a for the push shaft 23 to extend into, and the proximal end of the push shaft 23 passes through the fixing through hole 24231a and is relatively fixed to the fixing seat 24231.

[0040] Reference Figure 7 As shown, the safety key 2422 includes a hand-held portion 24224 and an insertion portion, wherein the insertion portion includes a first insertion portion 24221 connected to the hand-held portion 24224 and a second insertion portion 24222 connected to the first insertion portion 24221. The maximum height of the safety key 2422 is H, and the width is W.

[0041] The hand-held portion 24224 is flat, and the width of the hand-held portion 24224 is W, providing a comfortable finger gripping space. In addition, the flat surface of the hand-held portion 24224 is provided with an anti-slip convex portion and a concave portion.

[0042] The first insertion portion 24221 is columnar, the diameter of the first insertion portion 24221 is D1, and the axial length of the first insertion portion 24221 is L1.

[0043] The second insertion portion 24222 is axially connected to one end of the first insertion portion 24221 away from the hand-holding portion 24224, the two opposite surfaces in the circumferential direction of the second insertion portion 24222 are planes 24222a, and the other two opposite surfaces are arc surfaces 24222b connecting the two planes 24222a, the maximum radial spacing between the two arc surfaces 24222b is D2, the radial spacing between the two planes 24222a is T1, and the axial length of the second insertion portion 24222 is H1, wherein the maximum radial spacing D2 between the two arc surfaces 24222b of the second insertion portion 24222 is greater than the diameter D1 of the first insertion portion 24221, so that two hanging platforms are formed on the second insertion portion 24222. As a method of realizing the structure of the second insertion portion 24222, a columnar structure with a diameter of D2 may be selected, and then two opposite sides of the columnar structure may be cut to form two opposite planes 24222a and an arc surface 24222b connecting the two planes 24222a. It should be noted that the formation of the second insertion portion 24222 is not limited to the cutting method shown, and may also be formed by injection molding, for example.

[0044] Combination Figure 6 and Figures 8(a) to 8(c), a first plug hole 2421a is provided on the threaded drive column 2421, and the aperture of the first plug hole 2421a is d1. The first plug hole 2421a is provided with radially protruding locking portions 2421b on both sides of the end away from the second plug hole 24231b, and the radial spacing between the two locking portions 2421b is T2. It can be understood that since the locking portions 2421b are radially protruding from the first plug hole 2421a, the radial spacing between the two locking portions 2421b must be smaller than the aperture d1 of the first plug hole 2421a. Among them, the longitudinal length of the locking portion 2421b is smaller than the depth of the first plug hole 2421a.

[0045] Combination Figure 6 and Figures 9(a) to 9(c) The fixing seat 24231 is provided with a second plug hole 24231b, and the aperture of the second plug hole 24231b is d2. The aperture d2 of the second plug hole 24231b is larger than the diameter D1 of the first insertion part 24221. Preferably, D1 is larger than d2, so that the insertion part can be pulled out easily when unlocking.

[0046] In this embodiment, in the first orientation, for example Figure 3 and Figure 5 In the X direction shown in FIG. 1 , the insert portion can be radially inserted into the first insertion hole 2421a and the second insertion hole 24231b at the same time, so that the threaded drive column 2421 and the release assembly 2423 are relatively fixed (refer to Figure 12(a) to Figure 12(c) ), at this time, the safety key 2422 is rotated to rotate the safety key 2422 from the first position to the second position (refer to Figure 11(a) to Figure 11(c) ), when the safety key 2422 is rotated to the second position, the two hanging platforms on the second insertion portion 24222 rotate to respectively abut against the two locking portions 2421b, and the locking portions 2421b form a radial upper limit for the hanging platforms. At this time, the threaded drive column 2421 and the release component 2423 are relatively fixed, and the safety key 2422 is in a locked state that cannot be separated from the threaded drive column 2421 and the release component 2423.

[0047] The radial spacing T2 between the two locking portions 2421b is greater than or equal to the radial spacing T1 between the two planes 24222a. Preferably, T2 is greater than T1. When T2 is greater than T1, it is convenient to extract the safety key 2422 when unlocking.

[0048] Furthermore, when the safety key 2422 is in a locked state, the safety key 2422 can only be rotated from the second position to the first position under the action of an external force to prevent misoperation. In other words, the safety key 2422 will not rotate when it is not subject to an external force. This limitation prevents the safety key 2422 from being separated due to the placement of the pusher 20 and its own gravity, effectively ensuring the safety of the connection. Preferably, when the safety key 2422 is in a locked state, the safety key 2422 can only be rotated from the second position to the first position under the action of an external force and after the external force reaches a preset value, thereby avoiding rotation caused by unintentional misoperation.

[0049] In view of this, referring to Fig. 9 to Fig. 12(c), in one embodiment, the second insertion hole 24231b on the fixing seat 24231 is connected with the fixing through hole 24231a thereof, the axial length of the second insertion portion 24222 is H1, the distance between the abutting surface of the locking portion 2421b and the push shaft 23 located in the fixing through hole 24231a is H2, and H1 is greater than H2. When H1 is greater than H2, when the safety key 2422 is rotated to the second orientation, the push shaft 23 applies an outward squeezing force to the safety key 2422, so that the rotational friction between the hanging platform of the safety key 2422 and the locking portion 2421b is increased, thereby preventing the safety key 2422 from rotating and falling off. Among them, the axial length of the first insertion portion 24221 is L1, and the radial length of the locking portion 2421b is L2, and L1 is greater than L2.

[0050] The push shaft 23 has a certain degree of superelasticity, and the diameter of the push shaft 23 is smaller than the aperture of the fixed through hole 24231a, so that the proximal end of the push shaft 23 extends into the fixed through hole 24231a of the fixed seat 24231 and is loosely matched with the fixed seat 24231. The proximal end of the push shaft 23 is fixed to the fixed seat 24231 by a stopper. At this time, the push shaft 23 in the fixed seat 24231 is in a suspended state. For example, Fig.10 As shown, the push shaft 23 includes nickel-titanium wire or stainless steel wire d, stainless steel tube e and stainless steel tube f, which have a certain degree of superelasticity. Figure 6 As shown, the stopper may be a stop screw, which is symmetrically arranged along the outer circumference of the fixing seat 24231 , thereby fixing the proximal end of the pushing shaft 23 to the fixing seat 24231 .

[0051] Reference Figure 11(a) to Figure 12(c)When H1 is greater than H2, since the push shaft 23 placed in the fixed through hole 24231a of the fixed seat 24231 is in a suspended state, the safety key 2422 is inserted into the second positioning hole to apply pressure to cause the push shaft 23 to deform slightly downward (as shown at b in the figure). When the safety key 2422 is rotated from the first position to the second position and locked, the elastic push shaft 23 has a reverse pressure on the safety key 2422, which increases the pressure at the low connection between the safety key 2422 and the threaded drive column 2421 (as shown at a in the figure), thereby increasing the rotational friction of the safety key 2422 and preventing the risk of rotation and unlocking and falling off.

[0052] In another embodiment, continue to refer to Figure 7 and Figure 8 and Figure 11(a) to Figure 12(c) The inserting part also includes a third inserting part 24223 connected between the hand-held part 24224 and the first inserting part 24221. The third inserting part 24223 is columnar and has a diameter of D3. The threaded driving column 2421 is also provided with a third plug hole 2421c coaxial with the first plug hole 2421a and through-set. The aperture of the third plug hole 2421c is d3, and D3 is greater than d3, so that the third inserting part 24223 and the third plug hole 2421c are transitionally or interference-fitted (as shown at c in the figure), increasing the friction between the safety key 2422 and the threaded driving column 2421, and preventing the safety key 2422 from rotating easily or detaching due to its own gravity. This embodiment can not only achieve that when the safety key 2422 is in a locked state, the safety key 2422 can only rotate from the second position to the first position under the action of an external force. When the safety key 2422 is in the first position, the safety key 2422 can only be separated from the release assembly 2423 under the action of an external force. d3 is greater than D2, so that the safety key 24222 can be easily extracted when unlocking.

[0053] In another embodiment, the above two methods can be combined for practical use, that is, the insertion portion includes a hand-held portion 24224 and a third insertion portion 24223, a first insertion portion 24221 and a second insertion portion 24222 which are axially connected in sequence, the diameter D3 of the third insertion portion 24223 is larger than the aperture d3 of the third insertion hole 2421c, and the third insertion portion 24223 and the third insertion hole 2421c are transitionally or interference fit; at the same time, the axial length H1 of the second insertion portion 24222 is larger than the distance H2 between the abutting surface of the locking portion 2421b and the push shaft 23 located in the fixed through hole 24231a, which increases the circumferential friction between the safety key 2422 and the threaded drive column 2421 on the one hand, and increases the pressure at the low joint between the safety key 2422 and the threaded drive column 2421 at the same time, and the rotational friction is increased, thereby preventing rotation and falling off.

[0054] The present invention also exemplarily provides a clamping system 100 , which includes a clamp 10 and the pusher 20 described above, wherein the clamp 10 is detachably connected to the distal end of the pusher 20 .

[0055] The pusher and clamping system of the utility model has a safety key which can realize relative fixation of the threaded drive column and the release assembly in the first position, and is self-locking in the second position. In the self-locking state, the safety key cannot be separated from the threaded drive column and the release assembly, and double insurance is provided to effectively ensure the reliability of the connection.

[0056] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present utility model.

[0057] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A pusher, characterized in that: It comprises a pushing handle, a pushing sheath, a pushing shaft and a driving module, wherein the driving module is connected to the pushing handle, the proximal end of the pushing sheath extends into the pushing handle and is fixed relatively to the pushing handle, the pushing shaft is axially movably disposed in the pushing sheath and is connected to the driving module; the driving module comprises a moving component and a driving knob for driving the moving component to move axially, the moving component comprises a threaded driving column, a safety key and a releasing component, the driving knob is rotatably connected to the pushing handle, the threaded driving column is passed through the driving knob and is threadedly connected to the driving knob, the distal end of the releasing component extends into the threaded driving column, the pushing shaft passing through the pushing handle passes through the driving knob and the threaded driving column and is fixedly connected to the releasing component; In the first orientation, the safety key can be radially inserted into the threaded drive column and the release assembly at the same time to relatively fix the threaded drive column and the release assembly, and in this orientation, the safety key can at least be detached from the release assembly to release the relative fixation of the threaded drive column and the release assembly; when the safety key is radially inserted into the threaded drive column and the release assembly at the same time and rotated to the second orientation, the threaded drive column and the release assembly are relatively fixed and the safety key is in a locked state, in which the safety key cannot be detached from the threaded drive column and the release assembly.

2. The pusher according to claim 1, characterized in that: When the safety key is in a locked state, the safety key can be rotated from the second position to the first position only under the action of an external force, thereby preventing misoperation.

3. The pusher according to claim 1 or 2, characterized in that: The release assembly includes a fixing seat that can be extended into the proximal end of the threaded drive column and a release knob fixedly connected to the proximal end of the fixing seat. The fixing seat is axially provided with a fixing through hole for the proximal end of the push shaft to extend into. The proximal end of the push shaft passes through the fixing through hole and is fixed relative to the fixing seat.

4. The pusher according to claim 3, characterized in that: The safety key comprises a hand-held portion and an insertion portion, wherein the insertion portion comprises a first insertion portion connected to the hand-held portion and a second insertion portion connected to the first insertion portion, wherein the first insertion portion is cylindrical, and the diameter of the first insertion portion is D1, and two opposite surfaces of the second insertion portion in the circumferential direction are planes, and the other two opposite surfaces are arc surfaces connecting the two planes, and the maximum radial spacing between the two arc surfaces is D2, and D2 is greater than D1, so that two hanging platforms are formed on both sides of the second insertion portion; The threaded drive column and the fixing seat are respectively provided with a first plug hole and a second plug hole, and radially protruding locking portions are provided on both sides of the first plug hole; In the first position, the insertion portion can be radially inserted into the first insertion hole and the second insertion hole at the same time, and when the safety key is rotated to the second position, the two hanging platforms are rotated to abut against the two locking portions respectively to form radial limitation.

5. The pusher according to claim 4, characterized in that: The axial length of the second insertion portion is H1; the second insertion hole on the fixing seat is connected to the fixing through hole, the distance between the abutting surface of the locking portion and the pushing shaft located in the fixing through hole is H2, and H1 is greater than H2.

6. The pusher according to claim 4, characterized in that: The radial distance between the two planes is T1, and the radial distance between the two locking portions is T2, and T2 is greater than T1.

7. The pusher according to claim 4, characterized in that: In the first orientation, the safety key can be disengaged from at least the release assembly only under the action of an external force.

8. The pusher according to claim 7, characterized in that: The insertion part also includes a third insertion part connected between the hand-held part and the first insertion part, the third insertion part is columnar, and the diameter of the third insertion part is D3; the threaded drive column is also provided with a third socket coaxial with the first socket and through-set, the aperture of the third socket is d3, and D3 is larger than d3, so that the third insertion part and the third socket have an interference fit.

9. The pusher according to claim 8, characterized in that: The d3 is greater than the D2.

10. The pusher according to claim 1, characterized in that: In the first orientation, the safety key can be disengaged from at least the release assembly only under the action of an external force.

11. A clamping system, characterized in that: It comprises a clamp and a pusher as claimed in any one of claims 1 to 10, wherein the clamp is detachably connected to the distal end of the pusher.

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