Clamping instrument

Abstract

The utility model relates to the field of medical instruments, in particular to a clamping instrument. In the prior art, once the clamping position of the hemostatic clip is wrong, the hemostatic clip usually needs to be kept in situ and waits for automatically falling off, in addition, some medical institutions use special detachers to detach the hemostatic clip, however, the detaching rate of the method is not high, and repeated attempts are often needed to succeed. The clamping instrument comprises the tightening pipe and the at least two clamping arms, a locked part is arranged on at least one clamping arm, a locking part is arranged on the tightening pipe, and the locking part or / and the locked part are / is provided with a limiting part, so that the hemostatic clip can be conveniently and rapidly disassembled when the clamping position is wrong, and the disassembling efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a clamping instrument. Background Art

[0002] In recent years, endoscopic technology has developed rapidly, and various surgeries using endoscopes have emerged. During these surgeries, tissue bleeding is often encountered. Disposable hemostatic clips are usually designed to be opened and closed during surgery or endoscopic treatment to achieve the purpose of hemostasis. After the common hemostatic clip clamps the tissue and locks it, if it is found that the clamping position of the hemostatic clip is wrong and you want to remove it, you can only wait for the hemostatic clip to fall off by itself. Even though CN208355513U discloses a detachable hemostatic clip, the clip can be unlocked by a disassembler after being locked. However, the existing method of disassembly using a disassembler often fails to disassemble due to the large gap between the clamp arm and the disassembly slot, resulting in the disassembler directly sliding into the gap between the two. Utility Model Content

[0003] In order to solve the technical problem that a remover easily slides into the gap between the clamp arm and the removal groove, resulting in a low success rate of removing the hemostatic clip, the utility model provides a clamping instrument.

[0004] The present specification provides a clamping device, including a clamp device, which includes: a tightening tube, at least two clamp arms, wherein at least one clamp arm is provided with a locked portion, and the tightening tube is provided with a locking portion; when the locked portion is engaged with the locking portion, the clamp device is in a locked state; when the locked portion is disengaged from the locking portion, the clamp device is in an unlocked state; wherein the locking portion and / or the locked portion are provided with a limiting portion for reducing the gap left when the two are in the locked state, and the limiting portion exceeds the reference plane where the locking portion itself and / or the locked portion are located.

[0005] In some embodiments, the locking portion is configured as a disassembly slot, and the locked portion is configured as a hook that can be inserted into the disassembly slot. When the hook is hooked on the disassembly slot, the clip device is in a locked state; the limiting portion is located on the disassembly slot and / or the hook.

[0006] In some embodiments, the limiting portion is a protrusion, which is at least partially disposed in the disassembly groove. The protrusion is formed by extending from the middle portion of the disassembly groove wall along the direction of the gap, so that the side groove wall is shaped in a middle portion higher than both sides.

[0007] In some embodiments, the disassembly groove further includes a guide portion, which is configured as a guide slope so that the opening size of the disassembly groove decreases from the outside to the inside, and the guide slope is configured on the groove wall on the side where the protrusion is located or on the groove wall on the opposite side.

[0008] In some embodiments, the limiting portion is a wing portion provided on the hook, and the wing portion extends from the hook along the direction where the gap is located.

[0009] In some embodiments, the disassembly groove further includes a locking limiting portion, which is configured as a blocking piece, and a notch is formed in the middle of the blocking piece. When the clip device is in a locked state, the hook is hooked on the notch.

[0010] In some embodiments, the radial distance of the outer diameter of the tightening tube is A, and the radial distance between the two ends of the disassembly groove in the circumferential direction is A1, and A1≥1 / 2A.

[0011] In some embodiments, the disassembly groove further includes an avoidance area, and the avoidance area at least partially forms a movement path for the hook to hook onto or detach from the disassembly groove.

[0012] In some embodiments, the clamping device also includes a remover, which provides unlocking pressure on the hook. Assuming that the structural dimension of the remover is d1, the groove dimension of the remover groove is D1, and the hook dimension of the hook is D2, D1-D2<d1; wherein, the structural dimension d1 is the working length of the remover; the structural dimension d1, the groove dimension D1, and the hook dimension D2 are all dimensions projected in the axial direction of the tightening tube.

[0013] In some embodiments, the locking portion is configured as a disassembly slot, and the locked portion is configured as a hook that can be inserted into the disassembly slot. When the hook is hooked on the disassembly slot, the clip device is in a locked state; the limiting portion is located on the disassembly slot and / or the hook;

[0014] The tightening tube includes a first tube and a second tube which are sleeved together, and the disassembly groove is formed by at least a first groove located on the first tube and a second groove located on the second tube. When a limiting portion is provided on the disassembly groove, the limiting portion is configured as a protrusion extending in the middle of the first groove wall along the direction of the gap.

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

[0016] 1. By providing a limiting portion on the locking portion or / and the locked portion, the gap between the locking portion and the locked portion when they are in a locked state after they are in contact with each other and fixed in position is effectively reduced, so that when the operator uses the remover to unlock the clip device, the remover will not slide into the gap, and can effectively contact the locked portion, thereby improving the success rate of removal.

[0017] 2. The avoidance area can ensure that the locked part will not collide or interfere with other parts during the locking and unlocking process, thereby ensuring that the hook can move smoothly. If there is no avoidance area, the locked part may be blocked by the groove wall during movement, resulting in the locking part and the locked part not being able to cooperate normally, and the clip device cannot be locked or unlocked normally.

[0018] 3. With a clear guiding slope, the operator can save the time needed to find the direction and strength when removing the hemostatic clip, thereby improving the efficiency of the operation.

[0019] 4. The clamp device is provided with a baffle with a notch, and the notch can form a physical constraint on the hook to limit the accidental sliding of the hook in the non-operating state. On the one hand, it ensures that the remover can effectively and forcefully rest on the hook, and on the other hand, it prevents the clamp device from being unlocked prematurely, affecting the surgical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] This specification will be further described in the form of an exemplary embodiment, which will be described in detail by the accompanying drawings. This embodiment is not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0021] Figure 1 is a schematic diagram of the overall structure of the clamp device 1;

[0022] Figure 2 for Figure 1 A schematic structural diagram of the middle chuck assembly 100;

[0023] Figure 3 for Figure 2 A cross-sectional view of the middle chuck assembly 100;

[0024] Figure 4 for Figure 1 An exploded view of the structure of the middle chuck assembly 100;

[0025] Figure 5 for Figure 4 A partial enlarged view of the middle H region;

[0026] Figure 6a is a front view of the tightening tube 120 in the first embodiment;

[0027] Figure 6b is a side view of the tightening tube 120 in the first embodiment;

[0028] Figure 6c for Figure 6b A partial enlarged view of the middle I area;

[0029] Figure 6d For other embodiments Figure 6c A schematic diagram of the deformation of the middle protrusion 152;

[0030] Figure 7a It is a structural exploded view of the tightening tube 120 in the first embodiment;

[0031] Figure 7b for Figure 7a A partial enlarged view of the middle J region;

[0032] Figure 7c is a schematic structural diagram of the second tube 130 in the first embodiment;

[0033] Figure 8 is a cross-sectional view of the tightening tube 120 in the first embodiment;

[0034] Fig. 9 It is a partial cross-sectional view of the distal end of the clamp device 1 when the clamp assembly 100 of the clamp device is closed;

[0035] Fig.10 It is a partial cross-sectional view of the distal end of the clip device 1 after the clip assembly 100 of the clip device is released and enters a locked state;

[0036] Fig.11a It is a structural schematic diagram of the clamp assembly 100 in a locked state;

[0037] Fig.11b for Fig.11a A partial magnified image of the middle K region;

[0038] Fig.12a A schematic diagram of the operation of the remover 400 to unlock the chuck assembly 100;

[0039] Figure 12b for Fig.12a A partial enlarged view of the middle M region;

[0040] Fig.13 for Fig.12a A partial cross-sectional view of the middle M area during the disassembly operation;

[0041] Fig.14 It is a structural schematic diagram of the tightening tube in the second embodiment;

[0042] Wherein, the accompanying drawings are marked as follows:

[0043] 1 is a clamp device;

[0044] 100 is a clamp assembly; 110 is a clamp arm; 110a is a first clamp arm; 110b is a second clamp arm; 111 is a connecting hole; 112 is a hook (locked part); 113 is a fixing tube; 120 is a tightening tube; 121 is a guide part; 122 is a disassembly groove (locking part); 122a is a first groove; 122b is a second groove; 130 is a second tube; 131 is a baffle (locking limiting part); notch 131a; 132 is an avoidance area; 133 is a pin hole; 140 is a first tube; 150 is a limiting part; 151 is a wing part; 152 is a protrusion; gap 160;

[0045] 200 is a conveying assembly; 210 is a connecting piece; 211 is a connecting piece; 212 is a connecting pipe; 220 is a control line; 230 is a spring end; 240 is a spring pin; 250 is a spring hose;

[0046] 300 is a handle assembly; 310 is a handle housing; 320 is a sliding finger ring;

[0047] 400 is a dismantler; 410 is a snare; DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0049] As shown in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0050] The "proximal end" and "distal end" involved in the embodiments of this specification can indicate directions, which means that along the axial direction of the clamp device 1 (for example, the extension direction of the conveying assembly 200), or along the direction in which the clamp device 1 enters the human body, the direction close to the operator and away from the target object is the "proximal end", and the direction close to the target object and away from the operator is the "distal end". "Proximal end" and "distal end" should not be understood as indicating only ends. The "circumferential direction" involved in the embodiments of this specification refers to the "circumferential direction", that is, the direction around the axis of the cylinder.

[0051] The "middle" involved in this embodiment can be a middle point or an interval; when defined as an interval, it includes the middle point. At this time, the middle can be exactly in the center or relatively offset, which is set according to the specific situation.

[0052] The "locked state" involved in the embodiments of this specification refers to the locking structure in the clamp assembly 100 cooperating to make the clamp arm 110 form a stable closed state. The "unlocked state" refers to the locking structure in the clamp assembly 100 cooperating to release the clamp arm 110 from the open state.

[0053] Embodiment 1:

[0054] Clip devices are mainly used to clamp bleeding points to effectively control local bleeding. Some clip devices are designed for single use, and once the tissue is clamped, their locking structure makes it difficult or impossible to reopen the clip device, which also means that once the clip device is mistakenly clamped in a non-target position, it may be difficult to remove or reposition it. Some clip devices are also designed to be detachable, but due to the unreasonable design of the clip device, the remover can easily slide into the gap on the clip device, resulting in the failure of the removal operation.

[0055] Based on this, in an embodiment of the present specification, a clamp device is provided, which includes: a tightening tube, at least two clamp arms, wherein at least one clamp arm is provided with a locked portion, and the tightening tube is provided with a locking portion; when the locked portion is engaged with the locking portion, the clamp device is in a locked state; when the locked portion is disengaged from the locking portion, the clamp device is in an unlocked state; wherein the locking portion and / or the locked portion are provided with a limiting portion for reducing the gap left when the two are in the locked state, and the limiting portion exceeds the reference plane where the locking portion itself or the locked portion itself is located.

[0056] In this embodiment, the limiting portion on the locking portion exceeds the reference plane on the locking portion, and the limiting portion on the locked portion exceeds the reference plane on the locked portion; of course, this is not a limitation in other embodiments as long as the gap can be reduced.

[0057] like Figure 1 As shown, the clamp device 1 includes a clamp head assembly 100 , a delivery assembly 200 and a handle assembly 300 .

[0058] The clamp assembly 100, as the core component of the clamp device 1, can directly clamp the bleeding tissue. In some embodiments, the clamp assembly 100 includes a tightening tube 120 and a clamp arm 110, wherein the clamp arm 110 includes at least a first clamp arm 110a and a second clamp arm 110b. The clamp assembly 100 can be switched between an open state and a closed state under the action of an external force. When the clamp assembly 100 is in the open state, the two clamp arms 110 are separated from each other to form a pair of parallel or outwardly curved jaws. This design enables the clamp assembly 100 to easily surround the human tissue that needs to stop bleeding. When the clamp assembly 100 is in the closed state, the two clamp arms 110 are close to each other, thereby clamping the tissue and achieving an effective hemostasis effect.

[0059] The delivery component 200 provides good flexibility, so that the clamp device 1 can be inserted into the human body through the working channel of the endoscope to treat the target tissue near the designated area. In some embodiments, the delivery component 200 includes a control line 220, a spring end 230, a spring pin 240 and a spring hose 250. The control line 220 is arranged in the channel of the spring hose 250 and extends axially along the spring hose 250. The "axial" and "radial" involved in the embodiments of this specification can represent orientations, and the "axial" refers to the direction in which the delivery component 200 extends, and the "radial" direction is perpendicular to the "axial" direction, that is, the "radial" is perpendicular to the direction in which the delivery component 200 extends.

[0060] The handle assembly 300 is generally designed to be easy for medical personnel to operate. As those skilled in the art will appreciate, when the clamp assembly 100 is inserted into the human body to clamp the target tissue, the handle assembly 300 remains outside the body for the user to operate. In some embodiments, the handle assembly 300 includes a handle housing 310 and a sliding finger ring 320. The sliding finger ring 320 is the part to which the operator directly applies force, and the surface is treated to be non-slip and wear-resistant.

[0061] like Figures 2 to 4 As shown, in some embodiments, the clamp assembly 100 further includes a fixing tube 113, and the proximal ends of the first clamp arm 110a and the second clamp arm 110b are both provided with a connecting hole 111. The fixing tube 113 passes through the connecting hole 111 to fix the first clamp arm 110a and the second clamp arm 110b together.

[0062] As understood by those skilled in the art, the fixing tube 113 can be made of a slender and high-strength metal element. After both ends of the fixing tube 113 are polished, they are smoothly inserted into and passed through the connecting hole 111 to connect the first clamp arm 110a and the second clamp arm 110b.

[0063] like Figure 4As shown, the clamp arm 110 is provided with a radially bent hook 112 as a locked portion, the hook 112 is located at the proximal edge of the clamp arm 110 and protrudes in a bent shape, the hook 112 is used to hook with the disassembly groove 122 serving as a locking portion on the tightening tube 120 after the clamp device 1 is released to put the clamp assembly 100 in a locked state, thereby preventing the clamp arm 110 from slipping off the tightening tube 120 and ensuring a lasting and stable hemostatic effect.

[0064] like Figure 5 As shown, the hook 112 is provided with a limiting portion 150. In this embodiment, the limiting portion 150 is a wing 151, which is located on the hook 112 and extends from the hook 112 along the direction of the gap 160 beyond the reference plane E where the hook 112 itself is located. In this embodiment, the reference plane E is located at the proximal end of the hook 112. In other embodiments, the wing 151 can be arranged at the distal end of the hook 112, in which case the reference plane E is located at the distal end of the hook 112. Here, the "gap" refers to the space between the disassembly groove 122 and the hook 112 when they are in a locked state after contacting and fixing the positions with each other; wherein the "direction where the gap is located" includes the direction on the side where the gap is located, the direction opposite to the side, and the direction having a certain angle with these directions. In other words, no matter which direction the wing 151 is arranged, as long as the direction that can reduce the gap 160 is defined as the "direction where the gap 160 is located".

[0065] like Figure 7a , Figure 7b As shown, in this embodiment, the tightening tube 120 includes a first tube 140 located on the outside and a second tube 130 located on the inside, which are sleeved and arranged, and the disassembly groove 122 also includes a first groove 122a and a second groove 122b with inconsistent inner diameters, wherein the disassembly groove 122 is formed by the first groove 122a and the second groove 122b being overlapped. The first groove 122a is located on the first tube 140, and the second groove 122b is located on the second tube 130.

[0066] The limiting portion 150 can also be set as a protrusion 152. The protrusion 152 is at least partially set on the first groove 122a. The protrusion 152 is formed by extending the middle part of the proximal groove wall of the first groove 122a along the direction of the gap 160, that is, there is a height difference between the plane G where the top of the protrusion 152 is located and the first groove reference plane T, so that the protrusion 152 exceeds the first groove reference plane T; wherein the middle part is an interval;. The middle protrusion 152 leaves a large space on its left and right ends, which is convenient for the disassembler to adjust the disassembly position and is not easy to be stuck. At the same time, the middle protrusion 152 can be used as a visual or tactile guide mark, which is convenient for the operator to quickly locate the disassembly position during the surgical operation. Among them, the protrusion 152 is arc-shaped and protrudes to avoid sharp edges from causing damage to the disassembler 400. (The "gap" here refers to the space between the first groove 122a and the hook 112 when they are in contact and fixed position and in a locked state, wherein the "direction of the gap" includes the direction of the side where the gap is located, the direction opposite to the side, and the direction with a certain angle to these directions. In other words, no matter which direction the protrusion 152 is arranged, as long as the direction that can reduce the gap 160 is defined as the "direction of the gap 160")

[0067] like Figure 6c As shown, when the angle Δ between the extension direction Y of the protrusion 152 and the axial direction X of the tightening tube 120 from the proximal end to the distal end is 0°, that is, the protrusion 152 extends along the distal end, the limiting effect is best. Figure 6d As shown, the protrusion 152 is arranged to extend toward the inner area of ​​the tightening tube 120, so that the angle Δ between the extending direction Y' of the protrusion 152 and the axial direction X of the tightening tube from the proximal end to the distal end is less than 90°.

[0068] like Figures 6a to 8 As shown, in some embodiments, the tightening tube 120 includes at least one disassembly groove 122, and the number of the disassembly grooves 122 is determined according to needs. Generally, several hooks 112 are set corresponding to several disassembly grooves 122. In this embodiment, the clamping arm 110 includes a first clamping arm 110a and a second clamping arm 110b, and the first clamping arm 110a and the second clamping arm 110b are both provided with hooks 112, so two disassembly grooves 122 are set in the circumference of the tightening tube 120.

[0069] Assuming that the radial distance of the outer circumference of the second tube 140 is A, the radial distance between the two ends of the disassembly groove 122 is A1, the radial distance between two adjacent disassembly grooves 122 in the circumferential direction is A2, and the radial distance of the outer circumference of the first tube 130 is A3, the chuck assembly 100 satisfies A1≥1 / 2A, A2<A3.

[0070] In other embodiments, the chuck assembly 100 satisfies A1 = 1 / 2A and A1 = A2. At this time, one disassembly groove 122 accounts for 1 / 4 of the entire pipe length, ensuring that the disassembler 400 can enter the disassembly groove 122 to perform the disassembly action. In this embodiment, the chuck assembly 100 satisfies A1 = 5 / 6A, ensuring that the disassembler 400 can enter the disassembly groove 122 more deeply.

[0071] As Figure 7c shown, a stop piece 131 is provided at the distal end of the second groove 122b as a locking restriction portion. Extended portions are formed along the axial direction of the second groove 122b on both sides of the edge of the stop piece 131. The arc lengths of the extended portions on both sides of the edge of the stop piece 131 are B1 and B3 respectively. A notch 131a is formed in the middle of the stop piece 131, and the arc length in the middle of the stop piece 131 is B2. The total arc length of the second groove 122b is B. In some embodiments, B1 and B3 can approach 0 infinitely, 1 / 3B < B2 < B; in this embodiment, B2 = 1 / 2B, B1 = 2 / 3B2, and B3 = 1 / 3B2.

[0072] When the clip device 1 is in the locked state, the hook 112 is hooked on the notch 131a. Among them, the middle part is an interval, the notch 131a corresponds axially to the protrusion 152, and the hook 112 is located between the notch 131a and the protrusion 152; when the notch 131a of the stop piece 131 protrudes compared with the groove wall of the first groove 122a (the groove wall is on the same side as the stop piece), at this time, the stop piece 131 also forms the limiting portion. Through design and installation, when the hook 112 is hooked on the notch 131a protruding from the first groove 122a, the gap 160 between the hook 112 and the disassembly groove 122 can also be effectively reduced.

[0073] An avoidance area 132 is provided at the proximal end of the second groove 122b. The avoidance area 132 sinks relative to the groove wall on the same side of the first groove 122a. The avoidance area 132 matches the hook 112, and at least part of the avoidance area 132 forms the movement path for the hook 112 to be hooked onto the disassembly groove 122. During the process of the chuck assembly 100 changing from the closed state to the locked state, the hook 112 moves radially outward and can smoothly pass through the avoidance area 132 and be hooked onto the disassembly groove 122.

[0074] In this embodiment, the avoidance area 132 is an arched gap bent towards the proximal end along the axis. In other embodiments, the avoidance area 132 can also be set as an elliptical gap, a strip-shaped gap, and a petal-shaped gap.

[0075] The size of the gap in the avoidance area 132 can be calculated and set according to the size of the hook 112 that needs to be avoided. At the same time, the edge of the gap is processed with rounded corners, chamfers or other curves to ensure that the hook 112 can be smoothly hooked on the disassembly groove 122 when the clamp assembly 100 is transformed into a locked state, and also to ensure that the hook 112 can be smoothly detached from the disassembly groove 122 during the process of the clamp assembly 100 being transformed from a locked state to a released state.

[0076] like Figure 7a As shown, a guide portion 121 is further provided at the far end of the first groove 122a. In the present embodiment, the guide portion 121 is specifically configured as a guide ramp so that the opening size of the first groove 122a (the "opening size" involved in the embodiments of this specification refers to the opening dimension in the radial direction, which is equivalent to a "trumpet shape") decreases from the outside to the inside, and the guide ramp is generally arranged on the groove wall on the opposite side of the protrusion 152.

[0077] In other embodiments, the protrusion 152 may be disposed at the distal end of the first slot 122a, and the guide portion 121 may be disposed at the proximal end of the first slot 122a.

[0078] like Fig. 9 As shown, the conveying component 200 also includes a connecting member 210. In the present embodiment, the connecting member 210 includes a connecting piece 211 and a connecting tube 212. The connecting piece 211 has a notch at the distal end and the connecting piece 211 can be hung on the fixed tube 113 through the notch. The proximal end of the connecting piece 211 is fixedly connected to the distal end of the connecting tube 212, and the connecting tube 212 is coupled to the control line 220.

[0079] The proximal end of the spring hose 250 is fixedly connected to the handle housing 310, and the distal end of the spring hose 250 is fixedly connected to the proximal end of the spring pin 240. The distal end of the spring end 230 is axially sleeved with the second tube 130 through the spring pin 240, wherein the distal end of the spring pin 240 is hooked on the pin hole 133 of the second tube 130.

[0080] The proximal end of the clamp arm 110 has a tendency to expand radially outward, and this expansion tendency is constrained by the connecting piece 211 connected to the fixing tube 113 . Under normal working conditions, the connecting piece 211 limits the radial movement of the proximal end of the clamp arm 211 .

[0081] In the clamp device 1, the proximal end of the control wire 220 is fixedly connected to the sliding finger ring 320. When the operator pushes the sliding finger ring 320 toward the distal end, the forward movement of the sliding finger ring 320 will drive the control wire 220 to extend toward the distal end along its axial direction; conversely, when the operator pulls the sliding finger ring 320 toward the proximal end, the control wire 220 will retract toward the proximal end along the axial direction under the traction of the slider.

[0082] like Fig.10As shown, when the fixed tube 113 moves toward the proximal end under the drive of the control line 220 until it abuts against the second tube 130, the operator continues to pull the sliding finger ring 320 toward the proximal end, and the connecting piece 211 will be deformed and separated from the fixed tube 113. At this time, the radial constraint on the clamp arm 110 is released, and the hook 112 set at the proximal end of the clamp arm 110 moves radially outward until it is hooked on the blocking piece 131 on the tightening tube 120, thereby locking the clamp device 1.

[0083] At the same time, the elastic pin 240 falls off from the pin hole 133 under the action of the connecting member 210, so that the spring end 230 is separated from the second tube 130, and the clamp assembly 100 is in a locked state and is released.

[0084] like Fig.11a , 11b As shown, when the hook 112 is hooked on the blocking piece 131 , the clamp assembly 100 is in a locked state. In this embodiment, after the clamp assembly 100 is locked, the hook 112 is hooked on the notch 131 a in the middle of the blocking piece 131 .

[0085] like Fig.12a , 12b As shown, the clamp device 1 also includes a remover 400. When the operator wants to unlock the chuck assembly 100, the remover 400 can be used to apply an unlocking pressure F, for example, with a force value greater than 1N, to the locked part of the chuck assembly 100 to release the hook 112 from the axial restriction. The remover 400 can use instruments such as snares and graspers.

[0086] like Fig.13 As shown, it is assumed that the structural dimension of the disassembler 400 is d1, the groove dimension of the disassembly groove 122 is D1, and the hook dimension of the hook 112 is D2, wherein the structural dimension d1 is the working length of the disassembler (the working length here refers to the partial length of the disassembler that can extend into the disassembly groove 122), and the structural dimension d1, the groove dimension D1, and the hook dimension D2 are all dimensions projected in the axial direction of the tightening tube. In this embodiment, the projection direction is a direction perpendicular to the axial direction; in other embodiments, the projection direction can also be a direction that forms other angles with the axial direction, such as an angle between 0° and 90°, such as 45°, 60°, etc.; as long as it is an angle that can prevent the disassembler 400 from entering the gap 160.

[0087] In some embodiments, the clip device 1 satisfies D1-D2<d1. In this embodiment, the clip device 1 satisfies D1-D2≤1 / 2d1, preferably D1-D2<1 / 2d1; for example, the structural dimension d1 of the disassembler is 0.3mm, and D1-D2<0.15mm. According to relevant experiments, it can be found that before the limiter 150 is set, the gap 160 is generally 0.2~0.25mm. After the limiter 150 is set, the gap 160 can be effectively limited to less than 0.15mm, such as 0.12mm, which greatly improves the success rate of disassembly of the clip device 1.

[0088] The specific disassembly operations are as follows:

[0089] When the clip device 1 is in a locked state, a disassembler 400 is used to apply an unlocking pressure F to the hook 112 (locked part). Under the action of the limiting part 150, the disassembler 400 fails to enter the gap 160 and abuts against the hook 112 (locked part). The disassembler 400 continues to apply the unlocking pressure F until the hook 112 (locked part) is disengaged from the disassembly groove 122 (locking part), and the clip device 1 is changed from a locked state to an unlocked state.

[0090] In this embodiment, the detacher 400 uses a snare 410. The hook 112 is retained in the notch 131a of the second groove 122b after being released. The head end of the snare 410 is inserted into the tightening tube 120 and slowly slides down to approach the guide portion 121. The snare 410 is tightened. Due to the action of the guiding slope of the guide portion 121, the snare 410 will slide into the first groove 122a to tighten the hook 112. The snare 410 is contracted by force, and the head end of the snare 410 is tightened. Fig.13 As shown, due to the existence of the limiting portion 150, the gap 160 between the hook 112 and the limiting portion 150 is small, and the head end of the snare 410 is difficult to enter the gap. The snare 410 continues to shrink until the hook 112 is disengaged from the second groove 112b. At this time, the clamp arm 110 loses its restriction, the disassembly of the clamp assembly 100 is completed, and the clamp device 1 is in an unlocked state.

[0091] Embodiment 2

[0092] The difference between this embodiment and the first embodiment is that the first tube 140 and the second tube 130 are integrally formed.

[0093] like Fig.14 As shown, a disassembly groove 122 is provided at the proximal end of the tightening tube 120, and a baffle 131 (locking limiting portion) is also provided at the distal end of the disassembly groove 122. Both sides of the edge of the baffle 131 extend axially along the disassembly groove 122 to form an extension portion, and a notch 131a is formed in the middle of both sides; a guide portion 121 is provided on the groove wall located on the outer side of the baffle 131.

[0094] A limiting portion 150 is also provided at the proximal end of the disassembly groove 122. The limiting portion 150 is specifically manifested as gradually rising from both sides of the groove wall of the disassembly groove 122 to the middle, forming an arc-shaped protrusion 152 with the middle part higher than the two sides; an avoidance area with the same structure as that of Example 1 is provided on the inner wall of the tightening tube 120 located on the inner side of the protrusion 152.

[0095] The beneficial effects that may be brought about by the embodiments of the present application include but are not limited to:

[0096] This solution minimizes the gap 160 left between the hook 112 and the disassembly groove 122 when the clip is in the locked state, adds a protrusion 152, a guide slope that cooperates with the disassembler 400, a notch 131a, and an avoidance area 132 to the disassembly groove 122, and sets a wing 151 on the hook 112, so that the disassembler 400 can effectively resist the hook 112, and the success rate of disassembly is greatly improved.

[0097] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and corrections to this specification. Such modifications, improvements and corrections are suggested in this specification, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of this specification.

[0098] At the same time, this specification uses specific words to describe the embodiments of this specification. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of this specification can be appropriately combined.

[0099] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of this specification are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0100] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Accordingly, the embodiments of this specification are not limited to the implementations explicitly introduced and described in this specification.

Claims

1. A clamping device, characterized in that: include: A clamp device, the clamp device comprising: a tightening tube, at least two clamp arms, wherein at least one clamp arm is provided with a locked portion, and the tightening tube is provided with a locking portion; When the locked portion is engaged with the locking portion, the clip device is in a locked state; when the locked portion is disengaged from the locking portion, the clip device is in an unlocked state; The locking portion and / or the locked portion are provided with a limiting portion for reducing the gap between the two when they are in a locked state, and the limiting portion exceeds the reference plane where the locking portion and / or the locked portion are located.

2. The clamping device according to claim 1, characterized in that: The locking portion is configured as a disassembly slot, and the locked portion is configured as a hook that can be inserted into the disassembly slot. When the hook is hooked into the disassembly slot, the clip device is in a locked state. The limiting portion is located on the disassembly groove and / or the hook.

3. The clamping device according to claim 2, characterized in that: The limiting portion is a protrusion, which is at least partially arranged in the disassembly groove. The protrusion is formed by extending the middle part of the disassembly groove wall along the direction of the gap, so that the side groove wall is in a shape with the middle part higher than the two sides.

4. The clamping device according to claim 3, characterized in that: The disassembly groove further comprises a guide portion, which is arranged as a guide slope so that the opening size of the disassembly groove decreases from the outside to the inside, and the guide slope is arranged on the groove wall on the side where the protrusion is located or on the groove wall on the opposite side.

5. The clamping device according to claim 2, characterized in that: The limiting portion is a wing portion provided on the hook, and the wing portion is extended from the hook along the direction where the gap is located.

6. The clamping device according to claim 2, characterized in that: The disassembly groove further comprises a locking limiting portion, which is arranged as a blocking piece, and a notch is formed in the middle of the blocking piece. When the clip device is in a locked state, the hook is hooked on the notch.

7. The clamping device according to claim 2, characterized in that: Assume that the radial distance of the outer diameter of the tightening tube is A, and the radial distance between the two ends of the disassembly groove in the circumferential direction is A1, and A1≥1 / 2A.

8. The clamping device according to claim 2, characterized in that: The disassembly groove further comprises an avoidance area, and the avoidance area at least partially forms a movement path for the hook to hook onto or detach from the disassembly groove.

9. The clamping device according to claim 2, characterized in that: The clamping device further includes a dismantler, which provides unlocking pressure to the hook. Assuming that the structural dimension of the dismantler is d1, the groove dimension of the dismantling groove is D1, and the hook dimension of the hook is D2, D1-D2<d1; The structural dimension d1 is the working length of the remover; the structural dimension d1, the groove dimension D1, and the hook dimension D2 are all dimensions projected in the axial direction of the tightening tube.

10. The clamping device according to claim 1, characterized in that: The locking portion is configured as a disassembly slot, and the locked portion is configured as a hook that can be inserted into the disassembly slot. When the hook is hooked on the disassembly slot, the clip device is in a locked state; the limiting portion is located on the disassembly slot and / or the hook; The tightening tube includes a first tube and a second tube which are sleeved together, and the disassembly groove is formed by at least a first groove located on the first tube and a second groove located on the second tube. When a limiting portion is provided on the disassembly groove, the limiting portion is configured as a protrusion extending in the middle of the first groove wall along the direction of the gap.

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