CN113017779B

CN113017779B - Locking device and rotary grinding medical instrument

Info

Publication number: CN113017779B
Application number: CN201911253616.9A
Authority: CN
Inventors: 王春临; 张劼; 钱太利; 王常焰; 常兆华
Original assignee: Shanghai Minimally Invasive Medical Technology Co ltd
Current assignee: Shanghai Minimally Invasive Medical Technology Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2022-08-12
Anticipated expiration: 2039-12-09
Also published as: CN113017779A

Abstract

The invention relates to a locking device and a rotary grinding medical instrument, wherein the locking device comprises a driving mechanism and at least one flexible body; at least one flexible body is arranged on one side of the shaft-shaped object and extends along the axial direction of the shaft-shaped object; wherein, the first end of at least one flexible body is fixedly arranged, and the second end of at least one flexible body is connected with the driving mechanism. The driving mechanism is used for driving the at least one flexible body to rotate around the shaft-shaped object so as to enable the at least one flexible body to be spirally wound on the shaft-shaped object and lock the shaft-shaped object. The invention has the advantages that the contact area of the locking device and the shaft-shaped object is increased, the locking device and the shaft-shaped object form soft contact, the shaft-shaped object can be well locked even if the surface of the shaft-shaped object is smooth, and the locking effect is good. And the device is suitable for shaft-shaped objects with different sizes and weights, and has wide application range. Meanwhile, partial vibration can be absorbed through the flexible body, a better protection effect is achieved on the shaft-shaped object, and the service life of the shaft-shaped object is prolonged.

Description

Locking device and rotary grinding medical instrument

Technical Field

The invention relates to the technical field of medical instruments, in particular to a locking device for locking a shaft-shaped object and a rotary grinding medical instrument.

Background

In the medical field, rotational atherectomy has become an indispensable treatment for Percutaneous Coronary Intervention (PCI). The principle of the rotational grinding operation is that calcified or fibrous arteriosclerosis plaques are removed through high-speed rotational grinding of a rotational grinding head at a vascular lesion, so that blood vessels blocked by the plaques are opened, smooth blood vessel inner cavities are obtained, and implantation of a subsequent stent is facilitated.

During the rotational abrasion treatment, a rotational abrasion guide wire is usually placed in the main branch vessel at the distal end of a diseased vessel, and a rotational abrasion head and a driving rod are conveyed to the diseased position along the rotational abrasion guide wire. During the rotational grinding, the rotational grinding head is slightly pushed along the rotational grinding guide wire and can move back and forth (pushing and withdrawing) at the pathological part, so that the curative effect of the rotational grinding is improved, complications can be reduced, and the long retention time of the rotational grinding head at the same part is avoided. In addition, the proximal end of the atherectomy guidewire also needs to be locked to ensure the effectiveness of the atherectomy procedure.

At present, a mechanical clamping mode is mostly adopted to lock the rotational grinding guide wire, for example, a lock wire shaft is provided, and locking is realized through opening and closing of an upper part and a lower part of the lock wire shaft. However, the contact area between the rotary grinding guide wire and the wire locking shaft is small, the rotary grinding guide wire and the wire locking shaft are in hard contact, and particularly, the surface of the rotary grinding guide wire is smooth, so that the clamping reliability is difficult to guarantee. Not only does this require a large clamping force during clamping, which can easily damage the spun guide wire, but also the centering effect of the spun guide wire is not good, and in particular, a heavy spun guide wire cannot be clamped, which limits the application range.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a locking device and a rotational atherectomy medical instrument, which aim to lock a shaft-shaped object with a smooth surface in a winding manner by a flexible body, wherein the shaft-shaped object comprises a rotational atherectomy guide wire or other guide wires. The locking mode can ensure the use reliability, has small clamping force, is not easy to damage shaft-shaped objects with smooth surfaces, such as guide wires and the like, can be applied to shaft-shaped objects with different sizes and weights, has wide use range, and particularly can absorb vibration to protect the shaft-shaped objects through the flexible body so as to prolong the service life of the locked objects.

In order to achieve the above object, the present invention provides a locking device for locking a shaft-shaped object, comprising a driving mechanism and at least one flexible body, wherein the at least one flexible body is arranged on one side of the shaft-shaped object and extends along the axial direction of the shaft-shaped object;

the flexible body has opposing first and second ends; the first end of at least one flexible body is fixedly arranged, and the second end of at least one flexible body is connected with the driving mechanism; the driving mechanism is configured to drive the at least one flexible body to rotate around the shaft-shaped object so as to enable the at least one flexible body to be spirally wound on the shaft-shaped object and lock the shaft-shaped object.

Optionally, the locking device includes a plurality of flexible bodies, the plurality of flexible bodies are symmetrically arranged around the shaft-shaped object, each flexible body extends along the axial direction of the shaft-shaped object, a first end of each flexible body is fixedly arranged, and a second end of each flexible body is connected with the driving mechanism; the driving mechanism is configured to drive the plurality of flexible bodies to rotate around the shaft-shaped object so as to enable the plurality of flexible bodies to be spirally wound on the shaft-shaped object and lock the shaft-shaped object.

Optionally, the locking device comprises more than four of the flexible bodies.

Optionally, the surface of the flexible body is formed with a concave-convex structure, or the surface of the flexible body is provided with a coating for increasing the friction force between the flexible body and the shaft-shaped object.

Optionally, the locking device further comprises a proximal connector and a distal connector arranged coaxially; the second end of the flexible body is connected with the near-end connecting piece, the first end of the flexible body is connected with the far-end connecting piece, and the far-end connecting piece is fixedly arranged;

the far-end connecting piece is provided with a far-end through hole which is axially communicated and is used for penetrating the shaft-shaped object; the driving mechanism is connected with the near-end connecting piece and used for driving the near-end connecting piece to rotate.

Optionally, the drive mechanism comprises a shaft that rotates about an axis of rotation; the rotating shaft is coaxially connected with the near-end connecting piece and is used for driving the near-end connecting piece to rotate.

Optionally, the drive mechanism further comprises a housing, a piston, and a spring; the far-end connecting piece, the near-end connecting piece, the rotating shaft, the piston and the spring are all arranged in the shell; the far-end connecting piece is fixedly connected with the shell; the proximal end connecting piece is rotatably connected with the shell; the piston is movably connected with the rotating shaft;

the piston is configured to move on the rotating shaft under the driving of external force, and the movement of the piston is converted into the rotating motion of the rotating shaft around the rotating shaft;

the spring is configured to store elastic potential energy during the piston is driven to move by external force, and release the elastic potential energy to drive the piston to reset when the piston is released from the external force.

Optionally, the driving mechanism further comprises a conversion member, and the conversion member is fixedly connected with the piston; the conversion piece is in transmission connection with the rotating shaft and is used for converting the linear movement of the piston into the rotary motion of the rotating shaft.

Optionally, the conversion piece is provided with a special-shaped hole, and the rotating shaft is provided with a spiral structure; the conversion piece is sleeved on the rotating shaft through the special-shaped hole, and the linear movement of the piston is converted into the rotary movement of the rotating shaft through the matching of the special-shaped hole and the spiral structure.

Optionally, the housing is provided with an air inlet for introducing external air to move the piston under the action of air pressure.

Optionally, the housing includes an inner housing and an outer housing, the outer housing is sleeved outside the inner housing, and the length of the inner housing is shorter than that of the outer housing; the piston and the conversion piece are sealed in the inner shell, the rotating shaft, the near-end fixing piece and the far-end fixing piece are arranged in the outer shell, and one part of the rotating shaft extends into the inner shell to be connected with the conversion piece.

Optionally, the proximal end connector has a proximal end through hole passing through axially, the distal end through hole and the proximal end through hole are coaxially arranged, and the shaft-shaped object is inserted into the proximal end through hole and the distal end through hole.

In order to achieve the above object, the present invention further provides a rotational atherectomy device, comprising a rotational atherectomy guide wire and a locking device, wherein the locking device comprises a driving mechanism and at least one flexible body, and the flexible body is arranged outside the rotational atherectomy guide wire and extends along an axial direction of the rotational atherectomy guide wire; the flexible body has opposing first and second ends; the first end of at least one flexible body is fixedly arranged, and the second end of at least one flexible body is connected with the driving mechanism; the driving mechanism is configured to drive the at least one flexible body to rotate around the rotational milling guide wire so that the at least one flexible body is spirally wound on the rotational milling guide wire and locks the rotational milling guide wire.

In the locking device and the rotational grinding medical instrument provided by the invention, the flexible body is driven by the driving mechanism to rotate and wind on the shaft-shaped object, so that the shaft-shaped object, particularly a smooth shaft-shaped object, is locked. The locking mode has the advantages that the contact area between the flexible body and the shaft-shaped object is large, the flexible body and the shaft-shaped object are in soft contact, and the shaft-shaped object can be well locked even if the surface of the shaft-shaped object is smooth, so that the locking effect is good, and the locking reliability is high. In particular, the locking device can also realize good locking for shaft-shaped objects with different sizes and weights, and has wide application range and more convenient use. And only with less power, can reach good locking effect, convenient operation also is difficult to damage axle form object. Particularly, the flexible body can also absorb vibration, for example, in the process of the rotational grinding operation, the rotational grinding guide wire can be well protected, and the service life of the guide wire is prolonged.

In the locking device and the rotary grinding medical instrument provided by the invention, the plurality of flexible bodies are preferably wound on the shaft-shaped object after being rotated to realize locking, the locking effect is better, and the centering performance of the shaft-shaped object is also good. Further, the flexible body is preferably an elastic body, and when the locking device is in an initial state, the flexible body is straightened, so that the winding number of the flexible body can be accurately controlled, and the operation is more convenient. Further, it is preferable that the rotation shaft is driven to rotate by the linear movement of the piston to drive the flexible body to rotate, so that the operation is more labor-saving.

Drawings

It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention. In the drawings:

FIG. 1 is an axial cross-sectional view of a locking device provided in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a rotating shaft provided in the preferred embodiment of the present invention;

FIG. 3 is a schematic structural view of a conversion member provided in accordance with a preferred embodiment of the present invention;

FIG. 4 is a schematic view of the locking device according to the preferred embodiment of the present invention in an initial state;

fig. 5 is a schematic view of an operating state of the locking device according to the preferred embodiment of the present invention.

In the figure:

10-a locking device;

1-a distal connector; 2-a flexible body; 3-a proximal connector; 4-guide wire; 5-a rotating shaft; 6-a shell; 61-an outer shell; 62-an inner housing; 63-air inlet; 7-a piston; 8-a transition piece; 81-heteromorphic pores; 9-spring.

The same or similar reference numbers in the drawings identify the same or similar elements.

Detailed Description

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings. It is to be noted that the drawings are in simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention.

As used in this specification, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

In the following description, for ease of description, "distal" and "proximal", "axial" and "circumferential" are used; "distal end" is the side away from the operator of the locking device; "proximal" is the side of the operator that is proximal to the locking device; "axial" is referred to as being along the longitudinal axis of the locking device; "circumferential" refers to a direction about the longitudinal axis of the locking device. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Furthermore, in the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

Fig. 1 is an axial cross-sectional view of a locking device 10 according to a preferred embodiment of the present invention. As shown in fig. 1, the present embodiment provides a locking device 10 for locking a shaft-shaped object, especially a shaft-shaped object with a smooth surface. The locking device 10 is mainly described herein by taking the guide wire 4 as an example to easily lock the shaft-like object, but the guide wire 4 is not limited to a rotational grinding guide wire (for guiding a rotational grinding device), and may be other guide wires, and the shaft-like object is not limited to a medical guide wire, and may also be a part of a medical catheter or the like.

In particular, the locking device 10 comprises a drive mechanism and at least one flexible body 2. The flexible body 2 is disposed on one side of the guide wire 4 and extends in the axial direction of the guide wire 4. In this embodiment, "flexible" means that the structure is capable of or susceptible to bending or torsional deformation during use (rotational movement). Further, the flexible body 2 has opposite first and second ends. Wherein a first end of the flexible body 2 is fixedly arranged and a second end of the flexible body 2 is connected with the driving mechanism. In this embodiment, the first end of the flexible body 2 is a distal end, and the second end is a proximal end. In practical use, the driving mechanism outputs power to drive the flexible body 2 to rotate around the guide wire 4, so that the flexible body 2 is spirally wound on the guide wire 4 after rotating, and the guide wire 4 is locked. The state of the single flexible body 2 locking the guide wire 4 can be seen in fig. 5.

In the invention, the guide wire 4 is wound by the rotation of the flexible body 2 to realize the locking of the guide wire 4, so that the contact area between the flexible body 2 and the guide wire 4 is large, the flexible body and the guide wire 4 are in soft contact, and the guide wire 4 can be well locked even if the surface of the guide wire 4 is smooth, therefore, the locking effect is good, and the locking reliability is high. Particularly, the guide wires 4 with different sizes and weights can be well locked, so that the locking device is wide in application range and more convenient to use. And only with less power, can reach good locking effect, convenient operation also is difficult to damage seal wire 4. In particular, the flexible body 2 can also absorb vibration, for example, in a rotational grinding operation, the guide wire 4 can be well protected, and the service life of the guide wire is prolonged.

In this embodiment, the locking device 10 preferably comprises a plurality of flexible bodies 2, i.e. two or more. A plurality of flexible bodies 2 are arranged, more preferably symmetrically, around the guide wire 4, and each flexible body 2 extends in the axial direction of the guide wire 4, while a first end of each flexible body 2 is fixedly arranged and a second end of each flexible body 2 is connected to a drive mechanism. The driving mechanism thus drives the flexible bodies 2 to rotate around the guide wire 4 at the same time, so that the flexible bodies 2 are spirally wound on the guide wire 4 after being rotated, and the guide wire 4 is locked, as shown in fig. 5. Here, the centering of the guide wire can be ensured by providing the plurality of flexible bodies 2, and since the plurality of flexible bodies 2 can be also interlaced in the rotation process, the contact area with the guide wire 4 is large, and the locking effect is better. In this embodiment, as shown in fig. 4, the number of the flexible bodies 2 is preferably four, and the four flexible bodies 2 are symmetrically arranged around the guide wire 4, so that the structure is simple and the locking effect is good.

The material of the flexible body 2 may be a resilient material such as nylon or rubber. Alternatively, the material of the flexible body 2 may also be a non-elastic material, i.e. the flexible body 2 has no elasticity. In this embodiment, the flexible body 2 is preferably an elastic body, and the use effect is more excellent. Further, the flexible body 2 may be a wire, a rope or a belt, and may also be a single wire or a multi-wire. In other embodiments, the flexible body 2 may also be a spring. Furthermore, the surface of the flexible body 2 is formed with a concave-convex structure, which is beneficial to increasing the friction force, thereby further increasing the clamping force. The shape of the concave-convex structure is not limited, and the concave-convex structure can be a spiral structure, a strip structure or a bump, for example. In an alternative embodiment, the surface of the flexible body 2 is provided with a coating which serves to increase the friction between the guide wire 4 and the flexible body 2, as well as the clamping force.

Further, the locking device 10 has an initial state, i.e., a state in which the flexible body 2 is not rotated, and an operating state, i.e., a state in which the flexible body 2 is rotated. When the flexible body 2 is an elastic body, preferably in an initial state, the flexible body 4 is in a straightened state (i.e. straightened), as shown in fig. 4, which facilitates accurate control of the number of windings of the flexible body and facilitates operation. Further, when the locking device 10 is in the working state, the flexible body 4 is driven to rotate, so that the flexible body 4 is spirally wound on the guide wire 4, i.e. as shown in fig. 5, preferably, the flexible body 2 is spirally wound on the guide wire 4 for more than a plurality of turns, such as 5 turns or more than 5 turns. In other embodiments, when the flexible body 2 is an elastic body, the flexible body 4 may also be in a bent state (i.e., not straightened) in the initial state. Conversely, if the flexible body 4 has no elasticity, then in the initial state, the flexible body 4 is ensured to be in a bent state to ensure a certain margin during rotation to enable helical winding on the guide wire 4.

Referring back to fig. 1, and as shown in conjunction with fig. 4 and 5, the locking device 10 further includes a proximal connector 3 and a distal connector 1, both of which are coaxially disposed. In this embodiment, the second end of each flexible body 2 is connected to the proximal connector 3, and the first end of each flexible body 2 is connected to the distal connector 1. The connection mode of the flexible body 2 and the proximal end connector 3 and the distal end connector 1 is not limited in the present invention, and may be, for example, hot melting, glue bonding or welding. The distal end connecting piece 1 is provided with a distal end through hole 11 which is axially penetrated, and the distal end through hole 11 is locally arranged and used for penetrating the guide wire 4. And, the distal end connector 1 is fixedly disposed. Therefore, the driving mechanism can drive the near-end connecting piece 3 to rotate as long as the driving mechanism is connected with the near-end connecting piece 3, and the rotation of the near-end connecting piece 3 drives the flexible body 2 to rotate. Further, the distance in the axial direction between the proximal connector 3 and the distal connector 1 is kept constant to ensure the locking effect. Further, the distance between the proximal connector 3 and the distal connector 1 in the axial direction is equal to the length of the flexible body 2 when straightened, so that in the initial state, the flexible body 2 is straightened by both connectors. Alternatively, the distance between the proximal connector 3 and the distal connector 1 in the axial direction is less than the length of the flexible body 2 when it is straightened, so that in the initial state the flexible body 2 is in a bent state between the two connectors. Further, the distance between the near-end connector 3 and the far-end connector 1 along the axial direction is larger than or equal to the distance of the flexible body 2 wound on the guide wire 4 for a plurality of circles, optionally, the near-end connector 3 is provided with a near-end through hole 31 which is axially communicated, the near-end through hole 31 is arranged in the center, and the far-end through hole 11 and the near-end through hole 31 are coaxial, so that the guide wire 4 penetrates into the far-end through hole 11 and then further penetrates into the near-end through hole 31 after penetrating through the flexible body 2, and the centering effect of the guide wire is better.

In this embodiment, the driving mechanism comprises a rotating shaft 5 rotating around a rotation axis, and the rotating shaft 5 is connected with the proximal end connector 3 and coaxially arranged, so that the rotating shaft 5 drives the proximal end connector 3 to rotate. In the invention, the rotating shaft 5 can be driven to rotate manually, and the rotating shaft 5 can also be driven to rotate electrically or by other power. For example, the proximal end of the shaft 5 is connected to a driving motor, and the shaft 5 is driven to rotate by the driving motor.

In an exemplary embodiment, the shaft 5 is driven in rotation by a piston 7. Referring specifically to fig. 1, the driving mechanism further includes a housing 6 and a piston 7, and the distal end connector 1, the proximal end connector 3, the rotating shaft 5 and the piston 7 are disposed in the housing 6. Wherein, the far-end connecting piece 1 is fixedly connected with the shell 6, and the near-end connecting piece 3 is rotatably connected with the shell 6. Meanwhile, the piston 7 is movably connected with the proximal end of the rotating shaft 5, and the piston 7 is configured to move on the rotating shaft 5 under the driving of external force, and the movement of the piston 7 is converted into the rotating motion of the rotating shaft 5 around the rotating axis. For example, the shaft 5 is screwed with the piston 7, the shaft 5 has an external thread, the piston 7 has an internal thread hole, the shaft 5 is inserted into the internal thread hole of the piston 7, and the axial movement of the shaft 5 is restricted, so that the movement of the piston 7 can drive the shaft 5 to rotate to realize the transmission and conversion of the movement.

In an alternative embodiment, the driving mechanism further comprises a conversion member 8, the conversion member 8 is fixedly connected with the piston 7, and the conversion member 8 is in transmission connection with the rotating shaft 5, so that the linear motion of the piston 7 is converted into the rotary motion of the rotating shaft 5 through the conversion member 8. Preferably, as shown in fig. 2, the rotating shaft 5 has a spiral structure, and the length and pitch of the spiral structure are set according to actual use requirements. As shown in fig. 3, the transition piece 8 has a profiled hole 81, the shape of the profiled hole 81 matching the spiral configuration. And the conversion piece 8 is sleeved on the rotating shaft 5 through the special-shaped hole 81, and the linear movement of the piston 7 is converted into the rotary movement of the rotating shaft 5 through the matching of the special-shaped hole 81 and the spiral structure. Doing so, the turned angle of the accurate control pivot 5 of being convenient for to the number of winding turns of this accurate control flexible body, such transmission mode is comparatively laborsaving moreover, and the pivot rotation can be driven to the less drive power of accessible, and it is more convenient to operate.

Referring further back to fig. 1, in order to ensure sealability, the housing 6 preferably includes an outer housing 61 and an inner housing 62, the outer housing 61 is fitted over the outer portion of the inner housing 62, and the length of the inner housing 62 is shorter than that of the outer housing 61 so that a part of the length of the outer housing 61 is exposed outside the inner housing 62. And the piston 7 and the converting element 8 are sealed in the inner shell 62, the rotating shaft 5, the proximal end fixing element 3 and the distal end fixing element 1 are all arranged in the outer shell 61, the proximal end of the rotating shaft 5 extends into the inner shell 62 to be connected with the converting element 8, and the converting element 8 moves in the inner shell 62 under the pushing of the piston 7. In this embodiment, the piston 7 may be detachably connected to the conversion member 8 by a bolt. For example, a plurality of studs are formed at one side of the transition piece 8, and the piston is locked to the transition piece 8 by locking bolts in the plurality of studs.

Further, an air inlet 63 may be provided in the inner housing 62, and external air (e.g., compressed air) may be introduced into the cavity of the inner housing 62 on the side of the piston through the air inlet 63, so that the piston 7 is moved by the air pressure. The driving mechanism further comprises a spring 9 which can be sleeved on the rotating shaft 5 and used for pushing the piston 7 to reset. Specifically, one end of the spring 9 abuts (may be connected or disconnected) the inner case 62, and the other end abuts (may be connected or disconnected) the conversion member 8. For example, after compressed gas is introduced, the piston 7 is pushed to move towards the far end of the locking device 10 under the action of air pressure, and the spring 9 is compressed, so that the spring 9 stores elastic potential energy; and after the compressed gas is stopped to be introduced, the spring 9 pushes the piston 7 to return to the initial position, and meanwhile, the rotating shaft 5 rotates in the opposite direction to unscrew the flexible body 2, so that the guide wire 4 is unlocked. The number of springs 9 may be one or more.

Further, the housing, the shaft, the proximal connector, the distal connector, the converter, and the piston may be made of medical polymer, such as polymer.

Further, the present embodiment also provides a rotational grinding medical instrument, which includes a rotational grinding guide wire and a locking device, where the locking device includes a driving mechanism and at least one flexible body, and the flexible body is disposed outside the rotational grinding guide wire and extends along an axial direction of the rotational grinding guide wire; the flexible body has opposing first and second ends; the first end of at least one flexible body is fixedly arranged, and the second end of at least one flexible body is connected with the driving mechanism; the driving mechanism is configured to drive the at least one flexible body to rotate around the rotational milling guide wire so that the at least one flexible body is spirally wound on the rotational milling guide wire and locks the rotational milling guide wire.

The above disclosure is not intended to limit the scope of the present invention to the preferred embodiments, and any modifications based on the structures provided by the above embodiments are intended to be within the scope of the present invention, for example, the present invention is not limited to the structure of the driving mechanism for driving the proximal end connector 3 to rotate, and may be a rack and pinion drive or a lead screw nut. One skilled in the art can take the contents of the above embodiments to take a counter-measure.

In summary, according to the technical solutions provided by the embodiments of the present invention, the flexible body is driven by the driving mechanism to rotate and wind around the guide wire, so as to lock the guide wire, and in such a locking manner, not only the contact area between the flexible body and the guide wire is large, but also the flexible body and the guide wire form soft contact, and even if the surface of the guide wire is smooth, the locking device can perform good locking, and therefore, the locking effect is good, and the locking reliability is high. Moreover, the guide wire device is also applicable to guide wires with different sizes and weights, has wide application range and is more convenient to use. And only with less driving force, can reach good locking effect, convenient operation also is difficult to damage the seal wire. Particularly, the flexible body can also absorb vibration, for example, in the rotary grinding operation, the rotary grinding guide wire can be well protected, and the service life of the rotary grinding guide wire is prolonged.

The above description is only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and any variations and modifications made by those skilled in the art in light of the above disclosure are within the scope of the present invention as defined in the appended claims.

Claims

1. A locking device is used for realizing locking of a shaft-shaped object and is characterized by comprising a driving mechanism and at least one flexible body, wherein the at least one flexible body is arranged on one side of the shaft-shaped object and extends along the axial direction of the shaft-shaped object;

the driving mechanism comprises a rotating shaft and a piston movably connected with the rotating shaft, the piston is configured to move on the rotating shaft under the driving of an external force, and the movement of the piston is converted into the rotation motion of the rotating shaft around a rotation axis;

the flexible body has opposing first and second ends; the first end of at least one flexible body is fixedly arranged, and the second end of at least one flexible body is connected with the rotating shaft; the rotating shaft is configured to drive at least one flexible body to rotate around the shaft-shaped object so as to enable the at least one flexible body to be spirally wound on the shaft-shaped object and lock the shaft-shaped object.

2. The locking device according to claim 1, wherein the locking device comprises a plurality of flexible bodies, the plurality of flexible bodies are symmetrically arranged around the shaft-shaped object, each flexible body extends along the axial direction of the shaft-shaped object, a first end of each flexible body is fixedly arranged, and a second end of each flexible body is connected with the rotating shaft; the rotating shaft is configured to drive the plurality of flexible bodies to rotate around the shaft-shaped object so that the plurality of flexible bodies are spirally wound on the shaft-shaped object and lock the shaft-shaped object.

3. The locking device of claim 2, comprising more than four of said flexible bodies.

4. Locking device according to claim 1 or 2, characterized in that the surface of the flexible body is formed with a relief structure or is provided with a coating for increasing the friction between the flexible body and the shaft-like object.

5. Locking device according to claim 1 or 2, further comprising a proximal connector and a distal connector arranged coaxially; the second end of the flexible body is connected with the near-end connecting piece, the first end of the flexible body is connected with the far-end connecting piece, and the far-end connecting piece is fixedly arranged;

the far-end connecting piece is provided with a far-end through hole which is axially communicated and is used for penetrating the shaft-shaped object; the rotating shaft is coaxially connected with the near-end connecting piece and used for driving the near-end connecting piece to rotate.

6. The locking device of claim 5, wherein the drive mechanism further comprises a housing and a spring; the far-end connecting piece, the near-end connecting piece, the rotating shaft, the piston and the spring are all arranged in the shell; the far-end connecting piece is fixedly connected with the shell; the proximal end connecting piece is rotatably connected with the shell;

7. The latching mechanism of claim 6, wherein said actuating mechanism further comprises a transition member, said transition member being fixedly coupled to said piston; the conversion piece is in transmission connection with the rotating shaft and is used for converting the linear movement of the piston into the rotary motion of the rotating shaft.

8. The latch of claim 7 wherein said transition member has a profiled bore and said spindle has a helical configuration; the conversion piece is sleeved on the rotating shaft through the special-shaped hole, and the linear movement of the piston is converted into the rotary motion of the rotating shaft through the matching of the special-shaped hole and the spiral structure.

9. Locking device according to claim 6, characterized in that the housing is provided with an inlet opening for the introduction of external gas for moving the piston under gas pressure.

10. The locking device of claim 7, wherein the housing comprises an inner housing and an outer housing, the outer housing is disposed outside the inner housing, the inner housing is shorter than the outer housing, the piston and the converting element are sealed in the inner housing, the shaft, the proximal fixing member and the distal fixing member are disposed in the outer housing, and a portion of the shaft extends into the inner housing and is connected to the converting element.

11. The locking device of claim 5, wherein the proximal connecting member has a proximal through hole extending axially therethrough, the distal through hole and the proximal through hole being coaxially disposed, the shaft-like object being inserted through the proximal through hole and the distal through hole.

12. A rotary grinding medical instrument is characterized by comprising a rotary grinding guide wire and a locking device, wherein the locking device comprises a driving mechanism and at least one flexible body, and the flexible body is arranged outside the rotary grinding guide wire and extends along the axial direction of the rotary grinding guide wire; the driving mechanism comprises a rotating shaft and a piston movably connected with the rotating shaft, the piston is configured to move on the rotating shaft under the driving of external force, and the movement of the piston is converted into the rotating motion of the rotating shaft around a rotating axis; the flexible body has opposing first and second ends; the first end of at least one flexible body is fixedly arranged, and the second end of at least one flexible body is connected with the rotating shaft; the rotating shaft is configured to drive at least one flexible body to rotate around the rotational grinding guide wire, so that at least one flexible body is spirally wound on the rotational grinding guide wire and locks the rotational grinding guide wire.