CN112023266A - Torsion auxiliary tool - Google Patents

Abstract

The invention relates to a twisting auxiliary tool which can be sleeved on a tubular medical instrument, in particular to a tiny medical catheter, wherein an operator only needs to manually operate to enable a base and a rotary sleeve to relatively move along the axial direction, so that a flexible sleeve in the rotary sleeve can be pressed and deformed to firmly clamp the tubular medical instrument, then the whole twisting auxiliary tool is operated to rotate to drive the tubular medical instrument to rotate together, and the far end of the tubular medical instrument is screwed into a target tissue in a body to fix the far end of the tubular medical instrument. The operation mode is very simple and convenient, the operation difficulty can be reduced, the operation time can be saved, and the infection risk of patients can be reduced.

Description

Torsion auxiliary tool

Technical Field

The invention relates to the technical field of medical instruments, in particular to a twisting auxiliary tool for driving a tubular medical instrument to rotate.

Background

With the development of physiological pacing research and the innovation of technology, bundle of his pacing has become a hot spot of research in recent years. As shown in fig. 1, the escherichia beam electrode lead 1 having a small diameter for treating heart rhythm-related diseases has been widely used in clinical practice. Since the spiral electrode 2 is provided at the distal end of the bundle electrode lead 1, the spiral electrode 2 of the bundle electrode lead 1 is screwed into the cardiac muscle to a depth deeper than other electrode leads, and if a conventional rotary tool cannot provide a sufficiently large torque, the screwing depth of the spiral electrode 2 cannot be satisfied, so that at present, the electrode body 3 is rotated by an operator with hands to transmit the torque to the tip (i.e., the distal end), so that the spiral electrode 2 is screwed into the cardiac muscle and then fixed in the heart, thereby achieving mechanical and electrical connection between the electrode and the cardiac muscle. In addition, since the diameter of the electrode body 3 of the Escherichia bundle electrode lead 1 is small, usually 1.0mm to 1.5mm, it is difficult for the operator to grip the electrode body 3, which is thin, with his fingers for rotational movement, which increases the difficulty of operation, and the surface of the electrode body 3 is usually coated with a lubricant, which makes the operation more difficult.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide a twisting aid for facilitating an operator to operate a tubular medical device to perform a rotational movement during a surgical procedure by the aid of the twisting aid, so as to reduce the difficulty of the surgical procedure, shorten the surgical time, and reduce the risk of infection of a patient.

In order to achieve the above object, the present invention provides a twisting assisting tool, which is used to be sleeved on a tubular medical device to drive the tubular medical device to rotate, and comprises:

a rotating sleeve having an inner cavity;

the base is provided with a first inner hole which is axially communicated, one part of the base extends into the inner cavity from one end of the rotating sleeve, and the other part of the base is arranged outside the rotating sleeve; and the number of the first and second groups,

the flexible sleeve is arranged in the inner cavity, is positioned between the other end of the rotary sleeve and the base and is provided with a second inner hole which is axially communicated, and the second inner hole is communicated with the first inner hole;

wherein: the first and second bores each have a radial dimension greater than a radial dimension of the tubular medical instrument; when the rotary sleeve and the base move oppositely along the axial direction, the flexible sleeve is extruded axially and radially to clamp the tubular medical instrument; and when the rotating sleeve and the base are located at a locked position, the rotating sleeve and the base are kept relatively static.

Optionally, the flexible sleeve is attached to an inner wall of the rotating sleeve.

Optionally, the twisting aid further comprises a limiting structure for limiting a maximum distance when the base and the rotary sleeve move in the axial direction towards each other.

Optionally, the limiting structure comprises a protrusion disposed on an outer surface of the base, the protrusion being configured to abut against the rotating sleeve when the rotating sleeve and the base are located at the maximum contact position.

Optionally, the inner cavity of the rotating sleeve is provided with an internal thread, and the outer surface of the base is provided with an external thread matched with the internal thread.

Optionally, the inner cavity of the rotary sleeve is provided with a clamping groove, and the outer surface of the base is provided with a protrusion matched with the clamping groove.

Optionally, a step surface is arranged in the inner cavity, and one end, away from the base, of the flexible sleeve abuts against the step surface.

Optionally, the outer surface of the base and/or the rotating sleeve is provided with an anti-slip structure.

Optionally, an anti-slip structure is arranged on the inner surface of the rotating sleeve matched with the flexible sleeve.

Optionally, the inner surface and/or the outer surface of the flexible sleeve is provided with an anti-slip structure.

Optionally, the flexible sleeve, the rotating sleeve and the base are arranged coaxially.

The twisting auxiliary tool can be sleeved on a tubular medical instrument, particularly a small medical catheter, and an operator only needs to manually operate to enable the base and the rotary sleeve to axially move oppositely, so that the flexible sleeve in the rotary sleeve is axially extruded to generate axial deformation. When the axial deformation of the flexible sleeve reaches a certain degree, the flexible sleeve is constrained by the rotating sleeve in the radial direction, and when the flexible sleeve is continuously axially extruded, the radial size of the second inner hole of the flexible sleeve is finally reduced, so that the tubular medical instrument is firmly clamped. Then the whole twisting auxiliary tool is operated to rotate, so that the tubular medical appliance can be driven to rotate together, and the anchoring mechanism (such as a spiral electrode) at the far end of the tubular medical appliance is screwed into target tissues in a body, so that the far end of the tubular medical appliance is fixed. The operation mode is very simple and convenient, the operation difficulty can be reduced, the operation time can be saved, and the infection risk of patients can be reduced. The twisting auxiliary tool is simple in structure and low in use cost, the flexible sleeve is in soft contact with the tubular medical instrument, the tubular medical instrument is not easy to damage, and the reliability is good.

The twisting auxiliary tool further comprises a limiting structure which is used for limiting the maximum distance between the base and the rotating sleeve when the base and the rotating sleeve move oppositely along the axial direction, so that the axial deformation and the radial deformation of the flexible sleeve after being axially extruded and radially extruded can be limited through the maximum distance, the flexible sleeve can be effectively ensured to provide a large enough clamping force for the tubular medical instrument, and the clamping reliability is ensured.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

FIG. 1 is a schematic view showing a structure of a conventional Escherichia beam electrode lead;

FIG. 2 is a perspective view of a twist assist tool in accordance with an embodiment of the present invention;

FIG. 3 is an axial cross-sectional view of a twist assist tool in accordance with an embodiment of the present invention;

FIG. 4 is a partial structural view of a rotary sleeve according to an embodiment of the present invention;

FIG. 5 is a perspective view of a flexible sleeve in an embodiment of the present invention.

The reference numerals are explained below:

a escherichia bundle electrode lead 1; a helical electrode 2; an electrode body 3;

a torsion assist tool 10; a rotating sleeve 11; an inner cavity 111; a step surface 112; anti-slip teeth 113; a base 12; a first inner bore 121; the projections 122; a flexible sheath 13; a second inner bore 131; stationary teeth 132; the non-slip structure 14.

The same reference numbers will be used throughout the drawings to refer to the same or like parts.

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 a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming 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. As used in this specification, the term "plurality" is generally employed in a sense including "at least two" unless the content clearly dictates otherwise. As used herein, the terms "proximal" and "trailing" generally refer to the end closer to the operator of the instrument, and the terms "distal" and "leading" generally refer to the end further from the operator of the instrument.

Fig. 2 is a perspective view of a twisting assistance tool according to an embodiment of the present invention, fig. 3 is an axial sectional view of the twisting assistance tool according to the embodiment of the present invention, fig. 4 is a partial structural view of a rotary sleeve according to the embodiment of the present invention, and fig. 5 is a perspective view of a flexible sleeve according to the embodiment of the present invention.

As shown in fig. 2 to 5, an embodiment of the present invention provides a twisting auxiliary tool 10, which is used to be sleeved on a tubular medical instrument to drive the tubular medical instrument to rotate, so that a distal end of the tubular medical instrument can be screwed into a target tissue to be fixed through a rotating motion. It should be understood that the present invention relates to tubular medical devices including, but not limited to, electrode leads, and may also be other medical devices, such as electrophysiology catheters and the like. The electrophysiology catheter may be an ablation catheter or a mapping catheter. In addition, the twisting assistance tool 10 of the present invention can be used for electrode leads including, but not limited to, a bundle electrode lead as long as the electrode lead has a small diameter (e.g., a diameter of 1.0mm to 1.5mm) and is difficult for an operator to directly operate the electrode lead to rotate with his/her hands.

In the following description, the twisting aid 10 of the present invention will be further described with reference to a tubular medical device as an electrode lead, but the present invention should not be limited to the electrode lead.

The twisting aid 10 comprises a rotating sleeve 11, a base 12 and a flexible sleeve 13. The rotary sleeve 11 has an inner cavity 111 (see fig. 4). The base 12 has a first bore 121 (see fig. 3) extending axially therethrough. The flexible sleeve 13 has a second bore 131 (see fig. 5) running axially therethrough. The flexible sleeve 13 is disposed in the inner cavity 111 of the rotary sleeve 11. The flexible sleeve 13 may be fixed in the inner cavity 111 by gluing, or the flexible sleeve 13 may be fixed in the inner cavity 111 by interference fit. The interference fit of the flexible sleeve 13 with the inner cavity 11 means that the outer diameter of the flexible sleeve 13 is larger than the inner diameter of the inner cavity 111, so that the flexible sleeve 13 is inserted into the inner cavity 111 by utilizing the elastic deformation of the flexible sleeve 13.

In addition, a portion of the base 12 is inserted into the inner cavity 111 from one end of the rotary sleeve 11, and another portion is disposed outside the rotary sleeve 11. And when the base 12 is inserted into the rotary sleeve 11, the flexible sleeve 13 is located between the other end of the rotary sleeve 11 and the base 12, and the first inner hole 121 is communicated with the second inner hole 131.

Further, the base 12, the rotary sleeve 11 and the flexible sleeve 13 are coaxially disposed so that the rotation axis of the electrode lead coincides with the rotation axis of the twisting auxiliary tool 10, thereby driving the distal end of the electrode lead to a rotation motion by the twisting auxiliary tool 10. In other embodiments, the rotation axis of the electrode lead and the rotation axis of the twisting auxiliary tool 10 may not coincide with each other, as long as the twisting auxiliary tool 10 can rotate to drive the electrode lead to rotate.

In addition, the inner diameter (i.e., radial dimension) of the first bore 121 is larger than the outer diameter (i.e., radial dimension) of the electrode lead to facilitate passage of the electrode lead through the base 12. In addition, in the initial state, the inner diameter of the second inner hole 131 is larger than the outer diameter of the electrode lead to facilitate the electrode lead to pass through the flexible sheath 13. And in a compressed state, that is, after the flexible sleeve 13 is subjected to axial compression and radial compression, axial deformation and radial deformation are generated, so that the inner diameter of the second inner hole 131 is reduced, and the flexible sleeve 13 is tightly attached to the surface of the electrode lead, thereby clamping the electrode lead.

The specific working principle is as follows: when the twisting assisting tool 10 is located at an unlocking position, the rotating sleeve 11 and the base 12 can move axially towards each other (i.e. approach each other), so that the flexible sleeve 13 is radially deformed by the axial pressing force exerted by the rotating sleeve 11 and the base 12, and when the radial deformation of the flexible sleeve 13 is constrained by the inner cavity of the rotating sleeve 11, the flexible sleeve 13 is also radially pressed by the rotating sleeve 11, so that the inner diameter of the second inner hole 131 is finally reduced. It should be understood that the inner diameter of the second inner bore 131 is larger than the outer diameter of the electrode lead when the flexible sheath 13 is not subjected to the axial pressing force and the radial pressing force. When the flexible sleeve 13 is subjected to axial and radial extrusion forces, the electrode lead can be clamped through the second inner hole 131, and at this time, the torsion assisting tool 10 is located at a locking position to lock the rotary sleeve 11 and the base 12, so that the rotary sleeve 11 and the base 12 are kept relatively still. When the electrode lead is clamped by the flexible sleeve 13, the operator can manually rotate the entire twisting auxiliary tool 10, so as to drive the electrode lead to rotate together with the electrode lead, and the distal end (such as a spiral electrode) of the electrode lead is screwed into a target tissue (such as myocardium) to complete fixation, and then the rotation operation is stopped. Then, the torsion assisting tool 10 is shifted from the locking position to the unlocking position, and the rotary sleeve 11 and the base 12 can move back and forth in the axial direction (i.e., move away from each other), so that the axial pressing force applied to the flexible sleeve 13 by the base 12 and the rotary sleeve 11 is released, and the radial pressing force applied to the flexible sleeve 13 by the rotary sleeve 11 is released, so that the flexible sleeve 13 releases the clamping of the electrode lead, and thereafter, the entire torsion assisting tool 10 can be removed from the electrode lead. It will be appreciated that either one of the rotary sleeve 11 and the base 12 may be held stationary and the other may be moved, or both may be moved, in the axial movement toward or away from each other.

In some embodiments, the outer surface of the flexible sleeve 13 may be pre-attached to the side wall corresponding to the inner cavity 111, so that the flexible sleeve 13 can directly deform in the radial direction after being axially extruded, and the radial deformation is relatively fast, and at this time, after the flexible sleeve 13 is axially extruded, the radial size of the second inner hole 131 directly decreases, so that the flexible sleeve can rapidly clamp the electrode lead, and a physician can more conveniently rotate the electrode lead. In another embodiment, the outer surface of the flexible sleeve 13 may not be attached to the sidewall of the inner cavity 111, and at this time, the flexible sleeve 13 is radially deformed toward the sidewall of the inner cavity 111 after being axially pressed until the outer surface of the flexible sleeve 13 is attached to the sidewall of the inner cavity 111, and then the radial dimension of the second inner hole 131 of the flexible sleeve 13 is increased. When the flexible sleeve 13 is continuously axially pressed, the flexible sleeve 13 is attached to the inner wall of the rotary sleeve. At this time, if the flexible sleeve 13 is continuously pressed axially, the radial size of the second inner hole 131 becomes smaller again due to the flexible sleeve 13 being restrained by the rotating sleeve.

It should be noted that, after the twisting auxiliary tool 10 of the present invention is sleeved on the electrode lead, the twisting auxiliary tool is disposed outside the body, for example, under the skin, without entering the blood vessel, so that the outer diameter of the twisting auxiliary tool 10 is not limited, which is convenient for the operator to hold the electrode lead with both hands. More specifically, when the torsion assist tool 10 of the present invention is applied to the escherichia coli electrode lead 1 shown in fig. 1, the torsion assist tool 10 is fitted over the electrode body 3 and disposed adjacent to a connector for connecting a pacemaker.

Therefore, after using the twisting auxiliary tool 10 of the present invention, an operator only needs to manually operate the base 12 and the rotary sleeve 11 to move in opposite directions along the axial direction, so as to deform the flexible sleeve 13 in the rotary sleeve 11 and firmly clamp the electrode lead, and after clamping the electrode lead, the operator operates the whole twisting auxiliary tool 10 to rotate, so as to drive the electrode lead to rotate together, and the distal end of the electrode lead is screwed into the target tissue in the body, so as to fix the distal end of the electrode lead. The operation mode is very simple and convenient, the operation difficulty can be reduced, the operation time can be saved, and the infection risk of patients can be reduced. The torsion auxiliary tool 10 is simple in structure and low in use cost, the flexible sleeve 13 is in soft contact with the electrode lead, the electrode lead is not easy to damage, and the reliability of the tool is good.

Further, the twisting auxiliary tool 10 further comprises a limiting structure for limiting the maximum distance when the base 12 and the rotary sleeve 11 move axially towards each other, so that the axial deformation and the radial deformation of the flexible sleeve 13 after being axially pressed and radially pressed are limited by the maximum distance, and the flexible sleeve 13 is ensured to have enough clamping force on the electrode lead under the limited axial deformation and radial deformation, so that the clamping reliability is ensured. The maximum distance value is not limited, and can be set automatically according to the actual clamping requirement. Further, the limiting structure includes a protrusion 122 (see fig. 3) disposed on the outer surface of the base 12, and the protrusion 122 is configured to abut against the rotary sleeve 11 when the rotary sleeve 11 and the base 12 are located at the maximum contact position. More specifically, when the rotary sleeve 11 and the base 12 are axially close to each other, the movement is stopped when the distal end surface of the projection 122 abuts against the proximal end surface of the rotary sleeve 11, which is the maximum contact position when the two are close to each other, and is also the lock position of the torsion assist tool 10.

Further, the present invention does not specifically limit the locking manner between the rotary sleeve 11 and the base 12, and includes, but is not limited to, a threaded connection or a snap connection. In this embodiment, the rotating sleeve 11 and the base 12 are connected in a screw-fit manner, that is, as shown in fig. 2 to 5, at this time, an inner cavity 111 of the rotating sleeve 11 is provided with an internal thread, and an outer surface of the base 12 is provided with an external thread which is matched with the internal thread. Further, the inner surface of the inner cavity 111 may be provided with an internal thread entirely or partially. If the inner surface of the inner cavity 111 is provided with the internal threads, the inner surface of the inner cavity 111 matched with the flexible sleeve 13 is also provided with the internal threads, so that the friction force can be increased through the internal threads, the slipping phenomenon when the flexible sleeve 13 is matched with the inner cavity 111 is prevented, and the flexible sleeve 13 is not easy to move. If the inner surface portion of the inner cavity 111 is internally threaded, these internal threads will primarily mate with external threads on the base 12. Therefore, the base 12 and the rotary sleeve 11 are moved toward or away from each other in the axial direction by the relative rotational movement of the base 12 and the rotary sleeve 11.

In an alternative embodiment, the rotating sleeve 11 and the base 12 may also be snap-connected. Further, the inner cavity 111 of the rotary sleeve 11 is provided with a clamping groove, and the outer surface of the base 12 is provided with a protrusion matched with the clamping groove. The invention does not limit the concrete modes (such as shape and number) of the buckle connection, and only needs to be unlocked and locked conveniently. It should be understood that when the rotating sleeve 11 and the base 12 are screwed or snap-locked, the rotating sleeve 11 and the base 12 are in the locked position; conversely, when the screw connection or the snap connection between the rotary sleeve 11 and the base 12 is released, the rotary sleeve 11 and the base 12 are in the unlocked position. For example, by holding the rotary sleeve 11 stationary and rotating the base 12 clockwise with respect to the rotary sleeve 11 until the screw is locked, the two are locked, and by holding the rotary sleeve 11 stationary and rotating the base 12 counterclockwise with respect to the rotary sleeve 11, the screw connection between the two can be released and the two are unlocked. If the rotary sleeve 11 and the base 12 are snap-connected, they can be locked or unlocked by a similar operation.

With further reference to fig. 3 and 4, a step surface 112 is disposed in the inner cavity 111, and an end of the flexible sleeve 13 away from the base 12 may abut against the step surface 112, so that the flexible sleeve 13 is conveniently pressed by the rotary sleeve 11 through the step surface 112. Here, "abutting" includes that one end of the flexible sheath 13 is in abutting contact with only the step surface 112, i.e., both are not connected, "abutting" may also include that one end of the flexible sheath 13 is connected with the step surface 112.

With further reference to fig. 2, the outer surface of the rotating sleeve 11 and/or the base 12 is provided with an anti-slip structure 14. The anti-slip structure 14 is used for increasing the friction force between the fingers and the rotating sleeve 11 and the base 12 when the fingers clamp the rotating sleeve to rotate, preventing the slipping phenomenon and facilitating the operation. Further, the anti-slip structure 14 may be an anti-slip groove, an anti-slip protrusion, or an anti-slip coating for increasing friction force, and the specific form is not limited. In this embodiment, the anti-slip structure 14 is preferably an anti-slip groove, and the groove width (width along the circumferential direction) of the anti-slip groove may be selected to be 0.5mm to 5.0mm, and the groove depth may be selected to be 0.1mm to 2.0 mm. The number of the anti-skid grooves is preferably a plurality, such as 2 to 20, and the anti-skid grooves are preferably uniformly arranged along the circumference. Further, the shape of the rotating sleeve 11 and the base 12 is preferably circular, and more preferably, the outer diameter of the rotating sleeve 11 is identical to the outer diameter of the base 12.

Referring back to fig. 4, the inner surface of the inner cavity 111 of the rotating sleeve 11, which is matched with the flexible sleeve 13, is preferably provided with anti-slip teeth 113 (i.e., anti-slip structure). The anti-slip teeth 113 are used for preventing the flexible sleeve 13 from slipping after the outer surface of the flexible sleeve 13 is matched with the inner surface of the rotating sleeve 11, so that the flexible sleeve 13 is not easy to move, and the operation reliability is ensured. The tooth width (width along the circumferential direction) of the anti-skid tooth 113 can be selected to be 0.5 mm-5.0 mm, and the tooth height can be selected to be 0.1 mm-2.0 mm. The number of the anti-slip teeth 113 is preferably a plurality, such as 2 to 20, and the plurality of anti-slip teeth 113 is preferably uniformly arranged along the circumference of the inner cavity 111. It should be appreciated that in other embodiments, the anti-slip teeth 113 may be replaced by anti-slip grooves (i.e., anti-slip structures).

With further reference to FIG. 5, the inner surface of the flexible sleeve 13 is preferably provided with retaining teeth 132 (i.e., a non-slip structure). By providing the fixing teeth 132 on the inner surface of the flexible sheath 13, the clamping force can be increased, making the electrode lead less likely to fall off. Furthermore, an anti-slip structure can be arranged on the outer surface of the flexible sleeve 13, so that the friction force of the flexible sleeve 13 matched with the rotating sleeve 11 is increased, and the flexible sleeve 13 is not easy to fall off and move. The fixed teeth 132 may be concave teeth or convex teeth. The tooth width (width along the circumferential direction) of the fixed teeth 132 can be selected to be 0.5 mm-5.0 mm, and the tooth depth can be selected to be 0.1 mm-2.0 mm. The number of the fixed teeth 132 is preferably plural, for example, 2 to 20. More preferably, the fixing teeth 132 are uniformly arranged along the circumference of the second inner hole 131. It should be understood that the inner and outer surfaces of the flexible sleeve 13 may be provided with anti-slip structures (e.g., fixed teeth) at the same time, or one of them may be provided with anti-slip structures.

Further, the material of the rotating sleeve 11 and the base 12 is preferably medical grade plastic, such as polyvinyl chloride (PVC), Polyethylene (PE), polypropylene (PP), polyurethane, polyamide, etc. The rotating sleeve 11 and the base 12 are preferably formed by injection molding. The material of the flexible sleeve 13 may be thermoplastic elastomer (TPE), silicone, or the like, and is not limited in particular. Here, the material of the flexible sheath 13 is soft and can be deformed by being pulled or pressed, and the flexible sheath 13 can restore its original shape after the force is lost. The processing mode of the flexible sleeve 13 is preferably hot press molding. In addition, the inner diameter of the first inner hole 121 is not limited, and in an initial state, the inner diameter of the second inner hole 131 is not limited as long as the insertion of an electrode lead or other medical catheter into the first and second inner holes 121 and 131 is facilitated. Illustratively, the inner diameter of the second inner hole 131 of the flexible sleeve 13 may be 1.0mm to 5.0 mm.

The manner in which the twist aid 10 of the present invention operates will be further described below in connection with a preferred embodiment to facilitate a better understanding of the present invention.

The base 12 and the rotary sleeve 11 are screw-fitted, and the electrode lead is a bundle electrode lead as an illustration. In practical application, the tail end (i.e. the proximal end) of the escherichia bundle electrode lead is inserted into the twisting auxiliary tool 10, the twisting auxiliary tool 10 is positioned at the electrode body position of the escherichia bundle electrode lead, then the rotary sleeve 11 and the base 12 are clamped by the left and right fingers respectively and do rotary motion, so that the two ends are axially close to each other, at the moment, the two end faces of the flexible sleeve 13 are axially extruded and deformed, the inner hole of the flexible sleeve 13 is reduced and tightly attached to the outer surface of the electrode body under the action of radial extrusion force, the rotation of the electrode body is stopped after the flexible sleeve 13 has enough clamping force on the electrode body, and then the rotary sleeve 11 is rotated, so that the electrode body rotates together with the inner hole until the spiral electrode at the head end of the escherichia bundle electrode lead is screwed into the cardiac muscle. Then, the rotary sleeve 11 and the base 12 are rotated reversely to completely separate the rotary sleeve 11 and the base 12 from the screw thread connection, and then the rotary sleeve 11, the base 12 and the flexible sleeve 13 are withdrawn from the tail end of the escherichia bundle electrode lead.

It should be noted that the preferred embodiments of the present invention are described above, but not limited to the scope disclosed in the above embodiments, for example, the above embodiments describe the locking manner of the base and the rotary sleeve and the limiting manner of the limiting structure in detail, and of course, the present invention includes but is not limited to the locking manner and the limiting manner listed in the above embodiments, and any changes made on the basis of the locking manner and the limiting manner provided in the above embodiments are all within the protection scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the present invention.

Claims (11)

1. A twisting aid for fitting over a tubular medical device to drive the tubular medical device to rotate, comprising:

a rotating sleeve having an inner cavity;

the base is provided with a first inner hole which is axially communicated, one part of the base extends into the inner cavity from one end of the rotating sleeve, and the other part of the base is arranged outside the rotating sleeve; and the number of the first and second groups,

the flexible sleeve is arranged in the inner cavity, is positioned between the other end of the rotary sleeve and the base and is provided with a second inner hole which is axially communicated, and the second inner hole is communicated with the first inner hole;

wherein: the first and second bores each have a radial dimension greater than a radial dimension of the tubular medical instrument; when the rotating sleeve and the base move in the axial direction, the flexible sleeve is squeezed axially and radially to clamp the tubular medical instrument, and when the rotating sleeve and the base are located at a locked position, the rotating sleeve and the base are kept relatively static.

2. The twisting aid of claim 1, wherein said flexible sleeve is conformed to an inner wall of said rotating sleeve.

3. The twist aid of claim 1, further comprising a stop structure for limiting a maximum distance of axial movement of the base and the rotary sleeve toward each other.

4. The twisting aid according to claim 3, wherein said stop structure comprises a projection provided on an outer surface of said base for abutting said rotary sleeve when said rotary sleeve and said base are in a maximum contact position.

5. The twisting aid according to any one of claims 1 to 4, wherein the inner cavity of the rotating sleeve is provided with an internal thread and the outer surface of the base is provided with an external thread cooperating with the internal thread.

6. The twisting aid according to any one of claims 1 to 4, wherein the inner cavity of the rotating sleeve is provided with a notch, and the outer surface of the base is provided with a protrusion which is engaged with the notch.

7. The twisting aid according to any one of claims 1 to 4, wherein a step surface is provided in the inner cavity, an end of the flexible sleeve facing away from the base abutting against the step surface.

8. Twisting aid according to any of claims 1-4, wherein the outer surface of the base and/or the rotary sleeve is provided with an anti-slip structure.

9. The twisting aid according to any one of claims 1 to 4, wherein an anti-slip feature is provided on the inner surface of the rotating sleeve that engages the flexible sleeve.

10. Twisting aid according to any of claims 1-4, wherein the flexible sleeve is provided with an anti-slip structure on the inner and/or outer surface.

11. The twisting aid according to any one of claims 1 to 4, wherein the flexible sleeve, the rotary sleeve and the base are arranged coaxially.

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