A self-locking structure and a retractor with a self-locking structure

Abstract

The present invention discloses a self-locking structure and a dilator with a self-locking structure. The self-locking structure includes a sliding knob, a card rail seat, a return spring and a snap spring. A connecting member and a locking portion are fixedly arranged on the sliding knob. The card rail seat is movably arranged on the sliding knob. A through hole is formed in the card rail seat, and the connecting member is inserted through the through hole. Mounting grooves are arranged on both sides of the through hole, and both ends of the return spring are assembled on the mounting grooves. The return spring is connected to the connecting member. A slot hole is further arranged on the card rail seat, and a snap spring is embedded in the slot hole. The snap spring includes an acting portion and a fixing portion, and the fixing portion and the acting portion are arranged in a V shape. The locking portion is movably arranged between the fixing portion and the acting portion. In the locked state, the locking portion presses and limits the acting portion on any tooth groove located in the housing; in the unlocked state, the locking portion disengages from the acting portion, and the acting portion can move on the tooth groove. The size of the dense mesh expansion can be locked at any time through the self-locking structure, ensuring the stable expansion effect of the dense mesh and preventing the dense mesh from moving in the blood vessel under the influence of the blood vessel shape.

Description

Technical Field

[0001] The present invention relates to the technical field of retractors, and particularly to a self-locking structure and a retractor with a self-locking structure. Background Art

[0002] An aneurysm is a common vascular defect formed due to the weakening of the blood vessel wall and subsequent expansion and dilation of the blood vessel wall. The blood vessel wall will gradually thin, and at certain positions, due to the continuous blood flow pressure, the blood vessel wall may rupture. Therefore, a blood vessel retractor is required during the operation.

[0003] In the prior art, the movable ball of the retracting structure is connected to a thin wire. By pressing the handle of the retracting structure, the handle drives the thin wire to move, and further drives the movable ball to move, so as to adjust the retracting state of the dense mesh.

[0004] During use, the size of the dense mesh retraction is achieved by controlling the pulling of the handle. Since the handle of the retracting structure does not have the function of locking at any time, the dense mesh will change its state of contraction or retraction during movement in the blood vessel, resulting in unstable retracting effect of the dense mesh. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the handle of the retracting structure in the prior art does not have the function of locking at any time, resulting in unstable retracting effect of the dense mesh.

[0006] To this end, the present invention provides a self-locking structure, including: a sliding knob, a rail seat, a return spring and a snap spring;

[0007] The sliding knob is adapted to be movably assembled to the housing, and includes at least one connecting member and a locking portion;

[0008] The rail seat is movably arranged on the sliding knob; a through hole is formed in the rail seat, and the connecting member passes through the through hole; mounting grooves are respectively arranged on both sides of the through hole; the return spring is connected to the connecting member, and both ends are fixedly arranged in the mounting grooves correspondingly;

[0009] A slot hole is further formed in the rail seat, the snap spring is embedded in the slot hole, the snap spring includes a fixing portion and an acting portion, and the fixing portion and the acting portion are arranged in a V shape; the locking portion is movably arranged between the fixing portion and the acting portion;

[0010] The locking portion is adapted to switch between a locking state in which the acting portion is pressed and limited on any tooth groove of the housing and an unlocking state in which the acting portion is disengaged as the sliding knob moves relative to the rail seat.

[0011] Further, one end of the acting portion corresponding to the tooth groove is arranged in a V shape and is adapted to be clamped into the tooth groove.

[0012] Furthermore, the locking portion is in the shape of a column; and a chamfer is provided on one side of the locking portion facing the action portion.

[0013] Furthermore, it also includes a spring block, and the action portion wraps the spring block.

[0014] Furthermore, the action portion wraps around the spring block and forms a V-shape toward the contact end of the locking portion.

[0015] Furthermore, two connecting members are arranged at intervals along the moving direction of the sliding button; and the reset spring is embedded between the two connecting members.

[0016] Furthermore, the sliding button also includes a sliding groove; the rail seat is movably arranged on the sliding groove.

[0017] The present invention further provides a spreader having a self-locking structure, further comprising: a housing provided with a limiting groove, wherein the sliding button is movably provided on the limiting groove;

[0018] The cover body is suitable for being assembled on the housing; the cover body is provided with a first wire guide hole and a second wire guide hole, which are arranged in a stepped hole manner;

[0019] A wire clamping structure is connected to the self-locking structure and is movably disposed in the housing; the wire clamping structure includes:

[0020] The wire core is provided with a plurality of elastic clamping claws;

[0021] A wire sheath is provided with a through hole coaxial with the first wire guide hole; the wire sheath is embedded in the housing and is suitable for moving along the axial direction of the housing; the wire sheath is provided with a contraction groove for contracting the clamping claw;

[0022] In the clamping state of the clamping jaws, the shrinkage groove is sleeved on the clamping jaws;

[0023] When the clamping jaws are in an open state, the contraction groove is separated from the clamping jaws.

[0024] Furthermore, the clamped section is provided on the wire clamping structure, and the axial cross section is in an I-shape;

[0025] Also includes card parts;

[0026] The clamping member includes at least two clamping claws and a connecting portion;

[0027] The clamping claw is clamped with the clamped section, and the connecting portion is connected to the sliding button or the rail seat.

[0028] Furthermore, the wire sheath is threadedly connected to the wire core.

[0029] Further, a guide member is axially provided on the housing, and a guide groove is correspondingly provided on the wire clamping sheath for the guide member.

[0030] Further, a chamfer is provided at the end of the first wire guiding hole.

[0031] The technical solution of the present invention has the following advantages:

[0032] 1. The self-locking structure provided by the present invention includes: a sliding knob, a rail seat, a return spring and a snap spring. The sliding knob is adapted to be assembled on the housing, and at least one connecting member and a locking portion are fixedly provided on the sliding knob. The rail seat is movably provided on the sliding knob along the moving direction of the sliding knob. A through hole is provided on the rail seat, and the connecting member is inserted through the through hole. Installation grooves are provided on both sides of the through hole, and both ends of the return spring are assembled on the installation grooves, and the return spring is connected to the connecting member. A slot hole is also provided on the rail seat, and a snap spring is embedded in the slot hole. The snap spring includes an acting portion and a fixing portion, and the fixing portion and the acting portion are arranged in a V shape. Among them, the locking portion is movably provided between the fixing portion and the acting portion. In the locked state, the locking portion presses and limits the acting portion on any tooth groove of the housing; in the unlocked state, the locking portion disengages from the acting portion, and the acting portion can move on the tooth groove.

[0033] In this self-locking structure, the normal state is the locked state, that is, when the sliding knob is not subjected to an external force, that is, when the return spring does not produce elastic deformation, at this time, the locking portion presses against the acting portion of the snap spring, and limits the acting portion in any tooth groove of a row of tooth grooves of the housing. Since the snap spring is embedded in the rail seat, the rail seat is locked in position at the same time. When unlocking, the sliding knob moves relative to the rail seat under the action of an external force, and the return spring is elastically deformed by pulling through the connecting member. The sliding knob drives the locking portion to move, so that the locking portion disengages from the acting portion. At this time, the acting portion is not restricted by the tooth groove and can move between the tooth grooves of the housing, that is, the rail seat can move on the housing at this time. When the rail seat moves to the required position with the sliding knob, the external force on the sliding knob is removed. At this time, the return spring elastically resets, pulls the connecting member, and further pulls the sliding knob to move in the reverse direction, so that the sliding knob resets. During the reset process of the sliding knob, the locking portion drives the locking portion to press against the acting portion again, so that the acting portion is pressed and limited on the tooth groove of the housing, realizing the re-locking of the position of the rail seat, and thus realizing the function of self-locking at any time.

[0034] 2. In the self-locking structure provided by the present invention, one end of the acting portion corresponding to the tooth groove is arranged in a V shape. The acting portion is pressed by the locking portion, ensuring that the V-shaped end of the acting portion can be tightly clamped in the tooth groove of the housing, ensuring the firmness of the self-locking between the acting portion and the card slot. At the same time, when the locking portion applies pressure to the acting portion, since one end of the acting portion corresponding to the tooth groove is in a V shape, through the guiding action of the V shape, it is easy for the acting portion to slide into the card slot, ensuring that the acting portion is stuck with the tooth groove.

[0035] 3. The self-locking structure provided by the present invention has a locking portion in the shape of a column, and a chamfer is provided on one side of the locking portion facing the acting portion. When the locking portion moves toward the acting portion, when the acting portion and the locking portion come into contact, the locking portion is easily guided and squeezed onto the locking portion by the action of the chamfer, so that the reset spring can easily pull the sliding button and the locking portion to reset.

[0036] 4. The self-locking structure provided by the present invention has a spring block wrapped around the action part, which hardens the action part through the spring block to prevent the action part from being subjected to excessive force in the locked state, causing deformation of the action part, causing the action part to break away from the tooth groove restriction, and causing the self-locking failure of the self-locking structure.

[0037] 5. In the self-locking structure provided by the present invention, the acting part wraps the retaining spring block toward the contact end of the locking part in a V-shape. When the locking part moves toward the acting part, when the acting part and the locking part come into contact, the acting part is easily guided and squeezed onto the locking part under the action of the V-shaped contact end, so that the reset spring can easily pull the sliding button and the locking part to reset.

[0038] 6. The self-locking structure provided by the present invention has two connecting pieces arranged at intervals, and a return spring is embedded in the gap between the two connecting pieces. The structure is simple and the assembly of the self-locking structure is convenient.

[0039] 7. In the self-locking structure provided by the present invention, a slide groove is provided on the slide button, and the rail seat is movably provided on the slide groove to prevent the rail seat from deflecting during the movement on the slide button.

[0040] 8. The expander provided by the present invention includes: a shell, a cover, a wire structure and a self-locking structure. A limiting groove is provided on the shell, and the self-locking structure is movably provided on the limiting groove. The cover is assembled on the shell, and a first wire guide hole and a second wire guide hole are provided on the cover, wherein the first wire guide hole and the second wire guide hole are provided as stepped holes. The wire structure and the self-locking structure are connected, and the movement of the self-locking structure can drive the self-locking structure to move in the shell. The wire structure also includes a wire core and a wire sheath, and a plurality of elastic clamping claws are provided on the wire core, and a through hole coaxial with the first wire guide hole is provided on the wire sheath. The wire sheath is embedded in the shell, and the wire sheath can move along the axial direction of the shell. A contraction groove is provided on the wire sheath for contracting the clamping claw. When the clamping claw is clamped, the contraction groove is sleeved on the clamping claw; when the clamping claw is expanded, the contraction groove is separated from the clamping claw.

[0041] This expander utilizes a wire sheath that fits over a wire core. The core's claws grip the dense mesh guidewire, and a self-locking mechanism drives the wire structure within the housing to adjust the mesh's expansion. The self-locking mechanism also locks the mesh's expansion at any time, ensuring a stable expansion effect and preventing the mesh's movement within the vessel from being affected by vessel shape.

[0042] 9. The spreader provided by the present invention further includes a clamping member, which clamps the wire clamping structure and the connecting member through the clamping member, so that the wire clamping structure and the self-locking structure are connected. The structure is simple and convenient for disassembly.

[0043] 10. For the spreader provided by the present invention, the wire clamping sheath and the wire clamping core are connected by threads. By rotating the wire clamping core, the wire clamping sheath can move towards the wire clamping core to tighten the clamping claws, or move away from the wire clamping core to open the clamping claws.

[0044] 11. For the spreader provided by the present invention, a guiding member is arranged on the housing along the axial direction, and a guiding groove is arranged on the wire clamping sheath corresponding to the guiding member, so that the wire clamping sheath can move along the axial direction of the housing in the housing and cannot rotate.

[0045] 12. For the spreader provided by the present invention, a chamfer is arranged at the end of the first wire guiding hole to provide a guiding function for inserting the wire, so as to facilitate the wire to be inserted into the first wire guiding hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 It is a schematic structural diagram of the spreader and the spread net in Embodiment 1 of the present invention;

[0048] Figure 2 It is a schematic structural diagram of the spreader in Embodiment 1 of the present invention;

[0049] Figure 3 It is a plan view of the cover body of the spreader in Embodiment 1 of the present invention;

[0050] Figure 4 It is a sectional view of the cover body of the spreader in Embodiment 1 of the present invention;

[0051] Figure 5 It is an exploded schematic diagram of the spreader in Embodiment 1 of the present invention;

[0052] Figure 6 It is a schematic structural diagram of the first housing of the spreader in Embodiment 1 of the present invention;

[0053] Figure 7 It is a schematic structural diagram of the second housing of the spreader in Embodiment 1 of the present invention;

[0054] Figure 8 It is Figure 7 an enlarged schematic diagram of part A in

[0055] Figure 9 Explosion schematic diagram of the wire clamping structure in the spreader in Embodiment 1 of the present invention;

[0056] Figure 10 Structural schematic diagram of the wire clamping sheath and the wire clamping core in the spreader in Embodiment 1 of the present invention;

[0057] Figure 11 Structural schematic diagram of the self-locking structure in the spreader in Embodiment 1 of the present invention;

[0058] Figure 12 Explosion schematic diagram of the self-locking structure in the spreader in Embodiment 1 of the present invention;

[0059] Figure 13 Schematic diagram of the reset state of the self-locking structure in Embodiment 1 of the present invention;

[0060] Figure 14 Schematic diagram of the downward state of the self-locking structure in Embodiment 1 of the present invention;

[0061] Figure 15 Schematic diagram of the downward state of the self-locking structure in Embodiment 1 of the present invention;

[0062] Figure 16 Schematic diagram of the reset state of the self-locking structure in Embodiment 1 of the present invention;

[0063] Figure 17 Schematic diagram of the reset state of the self-locking structure in Embodiment 1 of the present invention;

[0064] Figure 18 Schematic diagram of the upward state of the self-locking structure in Embodiment 1 of the present invention;

[0065] Figure 19 Schematic diagram of the upward state of the self-locking structure in Embodiment 1 of the present invention;

[0066] Figure 20 Schematic diagram of the reset state of the self-locking structure in Embodiment 1 of the present invention;

[0067] Figure 21 Structural schematic diagram of the clamping part in the spreader in Embodiment 1 of the present invention;

[0068] Figure 22 Structural schematic diagram of the connection between the clamping part and the self-locking structure in the spreader in Embodiment 1 of the present invention;

[0069] Figure 23 Structural schematic diagram of the connection between the clamping part and the wire clamping core in the spreader in Embodiment 1 of the present invention.

[0070] Explanation of reference numerals:

[0071] 1. Retractor

[0072] 11. First housing; 111. First guide member

[0073] 12. Second housing; 121. Second guide member; 122. Saw teeth

[0074] 13. Self-locking structure; 131. Slide button; 132. Rail seat; 133. Snap spring; 134. Return spring; 135. Connecting member; 136. Chute; 137. Snap spring block; 138. Locking portion; 139. Mounting groove; 1310. Through hole; 1311. Slot hole

[0075] 14. Wire clamping structure

[0076] 141. Wire clamping sheath; 1411. Through hole; 1412. Guide groove

[0077] 142. Wire clamping core; 1421. Claw; 1422. Thread

[0078] 143. Base

[0079] 15. Cover body; 151. First wire guiding hole; 152. Second wire guiding hole

[0080] 16. Clamping member; 161. Claw; 162. Connecting portion

[0081] 2. Dense mesh Detailed implementation manner

[0082] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0083] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0084] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0086] Embodiment 1

[0087] This embodiment provides a self-locking structure, as shown in Figure 7 、 Figure 8 、 Figure 11 and Figure 12 and includes: a sliding knob 131, a rail seat 132, a return spring 134, and a snap spring 133. The sliding knob 131 is adapted to be assembled to the housing, and at least one connecting member 135 and a locking portion 138 are fixedly provided on the sliding knob 131. The rail seat 132 is movably disposed on the sliding knob 131 along the moving direction of the sliding knob 131. A through hole 1310 is formed in the rail seat 132, and the connecting member 135 is inserted through the through hole 1310. Mounting grooves 139 are provided on both sides of the through hole 1310, and both ends of the return spring 134 are assembled in the mounting grooves 139. The return spring 134 is connected to the connecting member 135, and the return spring 134 is adapted to reset the sliding knob 131 and the rail seat 132 that generate relative movement. A slot hole 1311 is further provided on the rail seat 132, and a snap spring 133 is embedded in the slot hole 1311. The snap spring 133 includes an acting portion and a fixing portion, and the fixing portion and the acting portion are arranged in a V shape. Among them, the locking portion 138 is movably disposed between the fixing portion and the acting portion. In the locked state, the locking portion 138 presses and limits the acting portion on any tooth groove of the housing; in the unlocked state, the locking portion 138 disengages from the acting portion, and the acting portion can move on the tooth groove.

[0088] This self-locking structure is in a locked state under normal conditions. That is, when the sliding knob 131 is not subjected to external force, namely when the return spring 134 does not produce elastic deformation, at this time, the locking portion 138 presses against the acting portion of the snap spring 133, limiting the acting portion in any tooth groove of a row of tooth grooves in the housing. Since the snap spring 133 is embedded in the rail seat 132, the rail seat 132 is locked in position simultaneously. When unlocking, the sliding knob 131 moves relative to the rail seat 132 under the action of force, pulling the return spring 134 through the connecting member 135 to produce elastic deformation. The sliding knob 131 drives the locking portion 138 to move, causing the locking portion 138 to disengage from the acting portion. At this time, the acting portion is not restricted by the tooth grooves and can move between the tooth grooves of the housing, that is, the rail seat 132 can move on the housing at this time. When the rail seat 132 moves to the desired position with the sliding knob 131, the external force on the sliding knob 131 is removed. At this time, the return spring 134 elastically resets, pulling the connecting member 135 and further pulling the sliding knob 131 to move in the reverse direction to reset the sliding knob 131. During the reset process of the sliding knob 131, the locking portion 138 is driven to press against the acting portion again, causing the acting portion to be pressed and limited on the tooth grooves of the housing, realizing the re-locking of the position of the rail seat 132, thus realizing the function of self-locking at any time.

[0089] Specifically, as Figure 7 and Figure 8 shown, the tooth grooves on the housing can be sawteeth 122. The sawteeth 122 are arranged on one side of the housing and are correspondingly arranged with the snap spring 133. The snap spring 133 can be stuck with the sawteeth 122 under the pressing of the locking portion 138, further realizing the self-locking of the rail seat 132.

[0090] Specifically, as Figure 13 shown, one end of the acting portion corresponding to the tooth groove is arranged in a V shape. When the acting portion is pressed by the locking portion 138, it is ensured that the V-shaped end of the acting portion can be tightly stuck in the tooth groove of the housing, ensuring the firmness of the self-locking between the acting portion and the card slot. At the same time, when the locking portion 138 applies pressure to the acting portion, since one end of the acting portion corresponding to the tooth groove is in a V shape, through the guiding action of the V shape, it is easy for the acting portion to slide into the tooth groove, ensuring that the acting portion is stuck with the tooth groove.

[0091] Specifically, as Figures 12 - 13 shown, the locking portion 138 is in a columnar shape. Chamfers are provided on two included angle sides of the side of the locking portion 138 facing the acting portion. When the locking portion 138 moves towards the acting portion, first, the acting portion and the locking portion 138 come into contact. Under the action of the chamfer, the locking portion 138 easily guides and presses the acting portion onto the locking portion 138, making it easy for the return spring 134 to pull the sliding knob 131 and the locking portion 138 to reset. Among them, the surface of the locking portion 138 pressing against the acting portion is a plane, ensuring that the locking portion 138 can stably press against the acting portion and preventing the acting portion from slipping off the locking portion 138.

[0092] Specifically, as Figures 12 - 13As shown, it further includes a circlip block 137, and the acting part of the circlip 133 wraps the circlip block 137. As Figure 13 shown, the circlip block 137 is in the shape of a column. When the acting part is pressed by the locking part 138, one angle of the circlip block 137 is stuck on the saw teeth 122, and the other angle of the circlip block 137 is pressed against the locking part 138. The acting part is hardened through the circlip block 137 to prevent the acting part from deforming due to excessive force under the locked state, resulting in the acting part getting out of the tooth groove restriction and causing the self-locking structure 13 to fail to lock.

[0093] Specifically, as Figure 13 shown, the contact end of the acting part wrapping the circlip block 137 facing the locking part 138 is V-shaped. When the locking part 138 presses the acting part, the tip of the V shape presses against the locking part 138. When the locking part 138 moves towards the acting part, the acting part and the locking part 138 come into contact. Under the action of the V shape at the contact end, the acting part is easily guided and extruded onto the locking part 138, making it easy for the return spring 134 to pull the sliding button 131 and the locking part 138 to reset.

[0094] Specifically, as Figures 11 - 12 shown, two connecting pieces 135 are fixedly arranged on the sliding button 131, and the two connecting pieces 135 are arranged at intervals along the moving direction of the sliding button 131. The two connecting pieces 135 pass through the through hole 1310, and the return spring 134 is embedded through the gap between the two connecting pieces 135. The structure is simple and convenient for the assembly of the self-locking structure 13.

[0095] Specifically, as Figure 12 shown, a sliding groove 136 is arranged on the sliding button 131. The sliding groove 136 is in the shape of a rectangular parallelepiped groove, and the card rail seat 132 is movably arranged on the sliding groove 136 to prevent the card rail seat 132 from shifting during the movement on the sliding button 131.

[0096] The process of pushing the self-locking structure 13 downward:

[0097] As Figure 13 shown, at this time, the sliding button 131 is not affected by an external force, the return spring 134 is in a horizontal state, the locking part 138 presses the acting part, so that one end of the acting part is stuck on the saw teeth 122 of the housing. Since the circlip 133 is embedded in the slot hole 1311, the circlip 133 is further fixed to fix the card rail seat 132. At this time, the self-locking structure 13 is in a locked state.

[0098] As Figure 14As shown, the sliding knob 131 moves downward under the action of an external force. The sliding knob 131 drives the connecting member 135 to move downward, and the connecting member 135 pulls the return spring 134 to deform. At this time, the return spring 134 is in a V shape under the pull of the connecting member 135. The sliding knob 131 drives the locking portion 138 to move downward, so that the locking portion 138 is disengaged from the acting portion. At this time, the acting portion is not pressed by the locking portion 138, and the snap spring 133 can deform. When the snap spring 133 deforms under force, the acting portion of the snap spring 133 can move on the serrations 122. As Figure 15 shown, when the sliding knob 131 moves down to a specified position (the sliding knob 131 can pull the card rail seat 132 to move through the boundary of the chute 136, or the connecting member 135 pulls the boundary of the through hole 1310 to further drive the card rail seat 132 to move, or the locking portion 138 pulls the boundary of the slot hole 1311 to further drive the card rail seat 132 to move, or the connecting member 135 pulls the return spring 134 to further pull the card rail seat 132 to move), the sliding knob 131 pulls the card rail seat 132 to move.

[0099] As Figure 16 shown, when the external force on the sliding knob 131 is cancelled, the V-shaped return spring 134 deforms, making the return spring 134 become horizontal. The elastic force of the return spring 134 will pull the connecting member 135 to move upward, further driving the sliding knob 131 and the locking portion 138 to move upward, so that the locking portion 138 presses the acting portion against the serrations 122, and the self-locking structure 13 is in a locked state.

[0100] The process of pushing the self-locking structure 13 upward:

[0101] As Figure 17 shown, at this time, the sliding knob 131 is not affected by an external force, the return spring 134 is in a horizontal state, the locking portion 138 presses the acting portion, and one end of the acting portion is stuck on the serrations 122 of the housing. Since the snap spring 133 is embedded in the slot hole 1311, the snap spring 133 is fixed to further fix the card rail seat 132. At this time, the self-locking structure 13 is in a locked state.

[0102] As Figure 18 shown, when the sliding knob 131 moves upward under the action of an external force, the sliding knob 131 drives the connecting member 135 to move upward, and the connecting member 135 pulls the return spring 134 to deform, making the return spring 134 in a V shape. The sliding knob 131 drives the locking portion 138 to move upward, so that the locking portion 138 is disengaged from the acting portion. At this time, the acting portion is not pressed by the locking portion 138, and the snap spring 133 can deform. When the snap spring 133 deforms under force, the acting portion of the snap spring 133 can move on the serrations 122. As Figure 19As shown, when the sliding button 131 moves up to the specified position (the sliding button 131 can pull the rail seat 132 to move through the boundary of the sliding groove 136, or the connecting member 135 pulls the boundary of the through hole 1310 to further drive the rail seat 132 to move, or the locking part 138 pulls the boundary of the slot 1311 to further drive the rail seat 132 to move, or the connecting member 135 pulls the return spring 134 to further pull the rail seat 132 to move), the sliding button 131 pulls the rail seat 132 to move.

[0103] like Figure 20 As shown, when the external force of the sliding button 131 is cancelled, the V-shaped return spring 134 is deformed, causing the return spring 134 to become horizontal. The elastic force of the return spring 134 pulls the connecting piece 135 downward, further driving the sliding button 131 and the locking portion 138 to move downward, causing the locking portion 138 to press the action portion against the serrations 122, so that the self-locking structure 13 is in a locked state.

[0104] This embodiment also provides a spreader, such as Figure 2 and Figure 5 As shown, it includes: a shell, a cover 15, a wire structure 14 and a self-locking structure 13. A limit groove is set on the shell, and the self-locking structure 13 is movably set on the limit groove. The cover 15 is assembled on the shell, as shown in FIG. Figure 3 and 4 As shown, the cover 15 is provided with a first wire guide hole 151 and a second wire guide hole 152, wherein the first wire guide hole 151 and the second wire guide hole 152 are arranged as stepped holes. The wire clamping structure 14 is connected to the self-locking structure 13, and the movement of the self-locking structure 13 can drive the self-locking structure 13 to move in the shell. Figure 9 and 10 As shown, the wire structure 14 also includes a wire core 142 and a wire sheath 141. The wire core 142 is provided with a plurality of elastic clamping claws 1421. The wire sheath 141 is provided with a through hole 1411 coaxial with the first guide wire hole 151. The wire sheath 141 is embedded in the housing and can move along the axial direction of the housing. The wire sheath 141 is provided with a contraction groove suitable for contracting the clamping claw 1421. When the clamping claw 1421 is clamped, the contraction groove is sleeved on the clamping claw 1421; when the clamping claw 1421 is expanded, the contraction groove is separated from the clamping claw 1421.

[0105] This expander 1 employs a wire sheath 141 that fits over a wire core 142. The clamping jaws 1421 on the wire core 142 clamp the dense mesh guidewire. The self-locking mechanism 13 then moves the wire structure 14 within the housing to adjust the size of the dense mesh. Furthermore, the self-locking mechanism 13 locks the expanded size of the dense mesh at all times, ensuring a stable expansion effect and preventing the mesh's movement within the blood vessel from being affected by the vessel's shape.

[0106] Specifically, such as Figures 5 - 8As shown, the housing includes a first housing 11 and a second housing 12, and the first housing 11 and the second housing 12 are detachably connected. For example, the first housing 11 and the second housing 12 can be connected by snap connection for easy disassembly.

[0107] Specifically, as Figure 1 shown, by pushing the self-locking structure 13 to move the wire clamping structure 14, the wire clamping structure 14 pulls the guide wire to adjust the size of the expanded fine mesh.

[0108] Specifically, as Figures 21 - 23 shown, a clamped section is provided on the wire clamping structure 14, and the axial cross-section of the clamped section is in an I shape. It can be understood that limiting ends are provided at both ends of the clamped section. The expander 1 further includes a clamping member 16. The clamping member 16 includes two clamping claws 161 and a connecting portion 162. Among them, the two clamping claws 161 are clamped on the clamped section, and the clamping claws 161 can be arc-shaped to ensure the fitting of the clamping claws 161 and the clamped section. The connecting portion 162 is clamped with the connecting member 135. That is to say, the self-locking structure 13 and the wire clamping structure 14 are connected through the clamping member 16.

[0109] Specifically, as Figure 10 shown, the wire clamping sheath 141 is connected to the wire clamping core 142 by a thread 1422. A plurality of clamping claws 1421 are provided at the end of the wire clamping core 142, and the plurality of clamping claws 1421 are arranged in a circular array. A thread 1422 is provided on the wire clamping core 142, and a thread 1422 groove is provided in the contraction groove of the wire clamping sheath 141. Since the wire clamping sheath 141 cannot rotate in the housing, by rotating the wire clamping core 142, the wire clamping sheath 141 moves towards the wire clamping core 142, and the contraction groove further tightens the clamping claws 1421 to clamp the clamping claws 1421.

[0110] Specifically, as Figure 9 shown, the wire clamping structure 14 includes a wire clamping core 142 and a base 143. The wire clamping core 142 and the base 143 can be connected by snap connection. By rotating the base 143, the wire clamping core 142 can be further driven to rotate.

[0111] Specifically, as Figure 6 and Figure 7 shown, a first guide member 111 is provided on the first housing 11, and a second guide member 121 is provided on the second housing 12. The first guide member 111 and the second guide member 121 are in a convex strip shape. As Figure 10 shown, guide grooves 1412 are provided on both sides of the wire clamping sheath 141 corresponding to the guide members. The wire clamping sheath 141 is arranged on the first guide member 111 and the second guide member 121 through the guide grooves 1412. The wire clamping sheath 141 can move on the first guide member 111 and the second guide member 121 and cannot rotate.

[0112] Specifically, as Figure 4As shown, a chamfer is provided at the end of the first guide wire hole 151 to provide guidance for inserting the guide wire, so as to facilitate the insertion of the guide wire into the first guide wire hole 151.

[0113] When using the spreader 1 to clamp the mesh guide wire to adjust the size of the mesh opening:

[0114] As Figure 1 , Figure 5 , Figure 9 and Figure 10 shown, first insert the mesh guide wire into the first guide wire hole 151 and the second guide wire hole 152 of the cover body 15, and the guide wire inserts into the clamping area of the clamping jaw 1421 through the through hole 1411 of the wire clamping sheath 141. Rotate the base 143, and while the base 143 rotates, it drives the wire clamping core 142 to rotate. The wire clamping sheath 141 is restricted by the guide member and the guide groove 1412, and the thread 1422 on the wire clamping core 142 will cause the wire clamping sheath 141 to move towards the wire clamping core 142. The contraction groove of the wire clamping sheath 141 sleeves on the clamping jaw 1421, so that the clamping jaw 1421 contracts to clamp the guide wire. The user drives the wire clamping structure 14 to move by pushing the self-locking structure 13, and further pulls the guide wire to adjust the size of the mesh opening. At the same time, the size of the mesh opening is locked at any time through the self-locking structure 13 to ensure the stability of the mesh opening effect and prevent the mesh from moving in the blood vessel and being affected by the shape of the blood vessel.

[0115] As the first alternative implementation manner of Embodiment 1, one end of the return spring 134 can be fixedly arranged on one side of the through hole 1310 of the card rail seat 132, and the other end of the return spring 134 is connected to the connecting member 135. When the connecting member 135 moves in the through hole 1310, the return spring 134 is pulled to generate deformation. If the connecting member 135 is not affected by an external force, the elastic force of the return spring 134 will pull the connecting member 135 to reset, and further drive the sliding button 131 and the locking portion 138 to reset.

[0116] As the second alternative implementation manner of Embodiment 1, the guide member may not be provided on the housing, and the guide groove 1412 may not be provided on the wire clamping sheath 141. For example, a plane is provided on the periphery of the wire clamping sheath 141, and a surface that fits the plane of the wire clamping sheath 141 is provided inside the housing, so that the wire clamping sheath 141 can move in the housing. Due to the restriction of the housing on the plane, the wire clamping sheath 141 can be prevented from rotating in the housing.

[0117] As the third alternative implementation manner of Embodiment 1, the first housing 11 and the second housing 12 can also be detachably connected through a connecting member.

[0118] Further deformed, the first housing 11 and the second housing 12 can also be detachably connected through a hinge connection.

[0119] As a fourth alternative embodiment of Embodiment 1, the snap spring block 137 may not be provided, and the acting portion of the snap spring 133 is hardened so that the acting portion of the snap spring 133 cannot be deformed. When the locking portion 138 presses against the acting portion, the snap spring 133 cannot be deformed. When the locking portion 138 is not in contact with the acting portion, the snap spring 133 is stressed, and deformation occurs between the acting portion and the fixing portion of the snap spring 133, enabling the snap spring 133 to move on the saw teeth 122.

[0120] As a fifth alternative embodiment of Embodiment 1, the connecting portion 162 of the card member 16 is connected to the card rail seat. When the card rail seat moves to the required position with the sliding button, the external force on the sliding button is removed. At this time, the return spring elastically returns, pulling the connecting member and further pulling the sliding button to move in the reverse direction, causing the sliding button to return to its original position. Since the card member 16 is connected to the card rail seat, during the reset process of the sliding button, the card rail seat is locked, further locking the card member 16 to prevent the wire clamping structure from moving during the reset process.

[0121] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A self-locking structure, characterized in that, Comprising: A sliding knob (131), a clamping rail seat (132), a return spring (134) and a snap spring (133); The sliding knob (131) is adapted to be movably assembled to the housing, and includes at least one connecting member (135) and a locking portion (138); The clamping rail seat (132) is movably disposed on the sliding knob (131); a through hole (1310) is formed in the clamping rail seat (132), and the connecting member (135) is inserted through the through hole (1310); mounting grooves (139) are respectively disposed on both sides of the through hole (1310); the return spring (134) is connected to the connecting member (135), and both ends are correspondingly fixed in the mounting grooves (139); A slot hole (1311) is further formed in the clamping rail seat (1), and the snap spring (133) is embedded in the slot hole (1311). The snap spring (133) includes a fixing portion and an acting portion, and the fixing portion and the acting portion are arranged in a V shape; the locking portion (138) is movably disposed between the fixing portion and the acting portion; The locking portion (138) is adapted to switch between a locked state in which the acting portion is pressed and limited on any tooth groove of the housing and an unlocked state in which the acting portion is disengaged as the sliding knob (131) moves relative to the clamping rail seat (132).

2. The self-locking structure according to claim 1, characterized in that, One end of the acting portion corresponding to the tooth groove is arranged in a V shape and is adapted to be inserted into the tooth groove.

3. The self-locking structure according to claim 1, characterized in that The locking portion (138) is in a columnar shape; a chamfer is provided on one side of the locking portion (138) facing the acting portion.

4. The self-locking structure according to any one of claims 1-3, characterized in that, It further includes a snap spring block (137), and the acting portion wraps the snap spring block (137).

5. The self-locking structure according to claim 4, wherein The contact end of the acting portion wrapping the snap spring block (137) facing the locking portion (138) is in a V shape.

6. The self-locking structure according to claim 5, characterized in that, Two connecting members (135) are arranged at intervals along the moving direction of the sliding knob (131); the return spring (134) is embedded between the two connecting members (135).

7. The self-locking structure according to claim 6, characterized in that, A chute (136) is further provided on the sliding knob (131); the clamping rail seat (132) is movably disposed on the chute (136).

8. A spreader, characterized in that, Having the self-locking structure according to any one of claims 1-7, further comprising: A housing provided with a limiting groove, and the sliding knob (131) is movably disposed on the limiting groove; A cover body (15) adapted to be assembled to the housing; a first wire guiding hole (151) and a second wire guiding hole (152) are formed in the cover body (15), and are arranged as stepped holes; A wire clamping structure (14) connected to the self-locking structure (13) and movably disposed in the housing; the wire clamping structure (14) includes: A wire clamping core (142) provided with a plurality of elastic clamping claws (1421); A wire clamping sheath (141) provided with a through hole (1411) coaxial with the first wire guiding hole (151); the wire clamping sheath (141) is embedded in the housing and is adapted to move along the axial direction of the housing; a shrinking groove for shrinking the clamping claws (1421) is provided on the wire clamping sheath (141); In the state where the clamping claws (1421) are clamped, the shrinking groove is sleeved on the clamping claws (1421); When the clamping jaws (1421) are in an open state, the contraction groove is separated from the clamping jaws (1421).

9. The retractor according to claim 8, characterized in that, The clamped section is provided on the wire clamping structure (14), and the axial cross section is in an I-shape; Also includes a card (16); The clamping member (16) includes at least two clamping claws (161) and a connecting portion (162); The clamping claw (161) is clamped with the clamped section, and the connecting portion (162) is connected to the sliding button or the clamping rail seat.

10. The retractor according to claim 8, characterized in that, The wire sheath (141) is threadably connected to the wire core (142).

11. The retractor according to any one of claims 8-10, characterized in that, A guide piece is provided on the housing along the axial direction, and a guide groove (1412) is provided on the wire sheath (141) corresponding to the guide piece.

12. The retractor according to any one of claims 8-10, characterized in that, The end of the first wire guide hole (151) is chamfered.

Images