CN117297709A

CN117297709A - Tissue removal instrument

Info

Publication number: CN117297709A
Application number: CN202311621142.5A
Authority: CN
Inventors: 何罗建; 赵云; 石淑先; 李怡帆; 祝祎
Original assignee: Beijing New Cloud Medical Technology Co ltd; Suzhou Xinyun Medical Equipment Co ltd
Current assignee: Beijing New Cloud Medical Technology Co ltd; Suzhou Xinyun Medical Equipment Co ltd
Priority date: 2023-11-30
Filing date: 2023-11-30
Publication date: 2023-12-29
Anticipated expiration: 2043-11-30
Also published as: CN117297709B

Abstract

The present disclosure relates to a tissue removal instrument for surgical applications that includes a stop assembly and an operating assembly. The stop assembly has a trephine sleeve with a cutting portion at a distal end, a first docking portion at a proximal end, the operating assembly has a docking drive tube with a second docking portion at a distal end, and the second docking portion is adapted to the first docking portion. The present disclosure adds a docking drive tube on the trephine sleeve basis, the trephine sleeve and docking drive tube enabling the tissue removal instrument to transition between engaged and disengaged states with the cooperation of the first docking portion and the second docking portion. Under the condition that the trephine sleeve does not have cutting requirements, any operation of one end of the hand of an operator on the butt joint driving pipe positioned on the operation assembly cannot be reflected on the cutting part, and operation risks of an operation are reduced.

Description

Tissue removal instrument

Technical Field

The present disclosure relates to the field of surgical techniques, and in particular, to a tissue removal instrument for use in surgery.

Background

In some surgical procedures, it is desirable to resect a portion of the bone tissue of a patient. For example, in nerve decompression type surgery, bone tissue in the spine where degenerative changes or lesions are present is usually resected with rongeurs to avoid affecting the health of the surrounding bone by pressing on the nerve or continuing to deteriorate. However, during non-operation of the rongeur, i.e., during non-cutting, undesirable movement of the distal end of the rongeur due to operator mishandling tends to occur, increasing the operational risk of the procedure.

Disclosure of Invention

The present disclosure is directed to achieving: during non-operation, the problem of undesired movement of the distal end of the rongeur is eliminated.

The present disclosure provides a tissue removal instrument for surgical applications that includes a stop assembly and an operating assembly. The stop assembly has a trephine sleeve with a cutting portion at a distal end, a first docking portion at a proximal end, the operating assembly has a docking drive tube with a second docking portion at a distal end, and the second docking portion is adapted to the first docking portion.

Because the trephine cannula is working into the patient, any form of movement of the distal end of the trephine cannula without the need for cutting the trephine cannula may cause unpredictable injuries to the patient. The applicant has noted that since the proximal end of the trephine sleeve is located on the hand of the operator of the surgical instrument, each operation of the trephine sleeve by the operator is directly reflected on the distal end of the trephine sleeve. To this end, the present disclosure adds a docking drive tube on the basis of a trephine sleeve, the trephine sleeve and docking drive tube enabling the tissue removal instrument to be switched between engaged and disengaged states with the cooperation of the first docking portion and the second docking portion. In the case of a trephine sleeve without cutting requirements, any manipulation of the abutting drive tube at the operating assembly by one end of the operator's hand is not reflected at the distal end (i.e. cutting portion) of the trephine sleeve, reducing the operational risk of the procedure.

In an exemplary embodiment, the operating assembly further has a tissue probe axially extending into the trephine sleeve via the first docking portion, the tissue probe having a recess at a distal end adapted to cooperate with the cutting portion to complete cutting of tissue, the tissue removal instrument being in an engaged configuration when the second docking portion is docked with the first docking portion such that the cutting portion is movable between a first position exposing all of the recess and a second position fully covering the recess; when the second docking portion is disconnected from the first docking portion, the tissue removal instrument is in a disconnected configuration, wherein the state of motion of the first docking portion is independent of the state of motion of the second docking portion.

The present disclosure achieves complete cutting of tissue to be cut that is received within the recess by allowing the cutting portion to move between the first and second positions.

In an exemplary embodiment, the tissue removal instrument further comprises a stop sleeve adapted to receive the first and second abutments, the first and second abutments being constrained to move within the stop sleeve, that is, the first and second abutments being enclosed in the stop sleeve.

To avoid potential contamination within the trephine sleeve when the tissue removal instrument is in the open configuration, the present disclosure seals the first and second abutments within the stop sleeve such that the proximal end of the trephine sleeve is always in a relatively closed state in any configuration of the tissue removal instrument, reducing the likelihood of contamination within the trephine sleeve. Simultaneously, under the effect of spacing sleeve, the holistic relative position of spacing subassembly and operating unit has obtained fixedly.

In an exemplary embodiment, there is a first resilient element axially between the first abutment and the distal inner wall of the stop sleeve.

When the second docking portion is docked with the first docking portion, the distal end of the trephine sleeve moves forward against the tissue to be cut and cuts the tissue. If the tissue to be cut is hard and brittle, during the cutting process, the operator needs to apply a larger force, at this time, if the tissue to be cut is undesirably cut off or penetrated in advance due to the fact that the force applied to the tissue cannot be borne, the force of the operator is difficult to retract in time due to inertia, so that the distal end of the trephine sleeve still keeps a continuously advancing state, and the operation risk of the operation is increased.

According to the invention, the first elastic piece is arranged between the first butt joint part and the distal end inner wall of the limit sleeve, in the operation process, the butt joint driving tube pushes the first butt joint part through the second butt joint part, the first butt joint part is simultaneously subjected to opposite force from the first elastic piece in the advancing process, once the tissue to be cut is cut off or penetrated undesirably, the first elastic piece can play the counteracting effect on the inertia of the force of an operator to a certain extent, the advance of the first butt joint part is limited to a certain extent, the advance of the distal end of the trephine sleeve is further limited, and the operation risk of an operation is reduced.

In an exemplary embodiment, the distal end of the trephine sleeve is in the second position when the first resilient member is fully compressed by the first abutment. That is, the maximum distance from the distal end of the first abutment to the proximal inner surface of the stop sleeve is equal to the distance from the first position to the second position of the distal end of the trephine sleeve plus the distance that the first resilient element is fully compressed.

Still further, to better ensure surgical safety of the distal end of the drill-changing cannula after forward extension, the present disclosure defines a maximum travel distance of the first docking portion, ensuring a maximum travel distance of the distal end of the trephine cannula, i.e., the distal end of the trephine cannula travels furthest to the second position, further reducing the likelihood of the distal end of the trephine cannula causing undesirable injury to the patient.

In an exemplary embodiment, a second resilient member is provided between the first and second abutments for maintaining the tissue removing instrument in the open configuration.

Through the second elastic piece, an operator can realize the disconnection of the second butt joint part and the first butt joint part while removing the force applied to the butt joint driving pipe after finishing cutting, so that the subsequent operation preparation time is saved.

In an exemplary embodiment, the second elastic member and the first elastic member abut against the distal inner surface and the distal outer surface of the first abutting portion, respectively, that is, the position of the first abutting portion in the limiting sleeve is always unchanged only under the combined force of the second elastic member and the first elastic member, that is, the distal end of the trephine sleeve is located in the first position only under the combined force of the second elastic member and the first elastic member.

The first butt joint part is reset through the cooperation of the second elastic piece and the first elastic piece. When the force applied by the operator is withdrawn, the first docking portion can return to the initial position and the distal end of the trephine sleeve returns to the first position, further saving subsequent operational preparation time.

In an exemplary embodiment, the second elastic member has an elasticity smaller than that of the first elastic member.

In order to achieve a better transfer of motion from the mating drive tube during advancement of the trephine casing, the first mating portion therefore needs to remain in place until it is mated with the second mating portion. In the present disclosure, since the first elastic member has a relatively high elasticity, the second abutting portion may preferentially abut against the second abutting portion when the second abutting portion is pushed forward, and then move along with the movement of the second abutting portion.

In an exemplary embodiment, the stop assembly further has a telescoping sleeve comprising a receiving sleeve and a telescoping member, the telescoping member being adapted to adjust the length of the receiving sleeve at the distal end of the receiving trephine sleeve such that the distal end of the receiving sleeve is movable between a third position exposing all of the grooves and a fourth position just completely covering the grooves, the distal outer surface of the stop sleeve defining the furthest distance of proximal movement of the telescoping member, that is, the distal end of the receiving sleeve is in the third position when the telescoping member contacts the stop sleeve.

The accommodating sleeve plays a role in accommodating the cut tissues so as to prevent the cut tissues from falling into a patient. Therefore, the receiving sleeve needs to be operated after the cutting work is completed. To ensure that the cutting action of the cutting cannula is not interfered with, in the present disclosure, the receiving cannula is positioned at a third position exposing all of the recesses at its distal end prior to the receiving action.

In an exemplary embodiment, the operating assembly further comprises a positioning probe adapted to position the tissue removal instrument distally within the patient, and a stopper secured to a proximal end of the positioning probe, the stopper having a first through slot extending axially therethrough, the telescoping member being configured to slide along the first through slot.

Because the overall length of the telescoping member can be adjusted while the telescoping member is slidable along the first channel, the telescoping member and the trephine cannula and tissue probe disposed within the telescoping member can have a sufficient range of movement while the distal end of the positioning probe is secured within the patient, and can be operated while maintaining a smooth motion.

In an exemplary embodiment, the distal wall of the groove of the tissue probe is provided with serrations. When the tissue to be cut is clamped and cut by the distal wall of the groove and the cutting portion, in order to reduce the occurrence of tissue slippage during cutting, the present disclosure reduces the possibility of tissue slippage by providing serrations on the distal wall so as to increase friction between the tissue and the groove.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below.

It is to be understood that the following drawings illustrate only some, but not all, embodiments of the disclosure.

It should be understood that the same or similar reference numerals are used throughout the drawings to designate the same or similar elements (components or portions thereof).

It should be understood that the figures are merely schematic and that the dimensions and proportions of the elements (components or portions thereof) in the figures are not necessarily accurate.

FIG. 1 is a schematic structural view of a tissue removal instrument in accordance with an embodiment of the present disclosure.

Fig. 2 is a schematic view of a stop assembly according to the tissue removal instrument of fig. 1.

Fig. 3 is a schematic view of the operating assembly of the tissue removal instrument of fig. 1.

Fig. 4 is a schematic structural view of one configuration of the tissue removal instrument of fig. 1.

Fig. 5 is an enlarged schematic view of the portion a in fig. 4.

Fig. 6 is a schematic structural view of another configuration of the tissue removal instrument of fig. 1.

FIG. 7 is a schematic cross-sectional view of the tissue removal instrument of FIG. 1.

Fig. 8-10 are enlarged schematic views of section B of fig. 7, and illustrate the mated state and configuration change in sequence.

Fig. 11-12 are enlarged schematic views of section C of fig. 7, and illustrate in sequence the mating state and configuration changes.

Fig. 13 is a partial schematic structural view of a tissue removal instrument in accordance with an embodiment of the present disclosure.

Detailed Description

Technical solutions in the embodiments of the present disclosure will be exemplarily described below with reference to the drawings in the embodiments of the present disclosure. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present disclosure. The components of the embodiments of the present disclosure, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the disclosure, as claimed, but is merely representative of selected embodiments of the disclosure.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

As shown in fig. 1-6, in an exemplary embodiment, the present disclosure provides a tissue removal instrument 100 for surgical applications, the tissue removal instrument 100 including a stop assembly 110 and an operating assembly 120. The spacing assembly 110 and the operating assembly 120 interface in a first direction. The stop assembly 110 has a trephine sleeve 112, the trephine sleeve 112 being hollow and extending in a first direction. The trephine sleeve 112 has a cutting portion 1122 at the distal-most end, and the cutting portion 1122 may be serrated as shown. In other embodiments, the cutting portion 1122 may also be in the form of a smooth cutting edge for grinding or cutting tissue to be cut for removal from the patient. At the proximal end, there is a first abutment 1124, wherein the first abutment 1124 circumferentially surrounds the trephine sleeve 112, in this embodiment the first abutment 1124 is provided in a middle section of the trephine sleeve 112, formed as a first recess opening towards the proximal end. In other embodiments, the first interface 1124 may also be provided on the proximal-most side of the trephine sleeve 112, i.e., the first interface 1124 may also serve as an extension of the trephine sleeve 112 proximally. The first interface 1124 remains in the same motion as the trephine sleeve 112.

As shown in FIG. 5, the operating assembly 120 has a tissue probe 124, and the tissue probe 124 extends axially into the trephine sleeve 112 via a first interface 1124 and is capable of extending distally of the trephine sleeve 112. The tissue probe 124 has a groove 1241 at a distal end, the groove 1241 being adapted to cooperate with the cutting portion 1122 to complete the cutting of tissue. The groove 1241 is for receiving tissue to be cut. The distal wall 1242 of the groove 1241 supports the tissue to be cut at one end during cutting, and is rotationally advanced from the proximal end to the distal end by the cutter 1122 to complete the cutting process of the tissue. The proximal end of tissue probe 124 is secured to operating assembly 120 and there is no relative positional change of tissue probe 124 with respect to operating assembly 120 and stop assembly 110.

As shown in FIG. 3, the operating assembly 120 also has an interfacing drive tube 122, the interfacing drive tube 122 extending in a first direction and sleeved over the tissue probe 124 and being rotatable and slidable relative to the tissue probe 124 in the first direction. In this embodiment, the operating assembly 120 further includes a handle portion 121 for grasping by a user and a trigger 123 rotatably coupled to the handle portion 121. The proximal end of the butt drive tube 122 is located in the handle 121 of the operating assembly 120, and the proximal end of the butt drive tube 122 moves axially to the distal end along with the pulling of the trigger 123, and the butt drive tube 122 is further provided with a rotating device 125, where the rotating device 125 is used to drive the butt drive tube 122 to perform an axial rotation motion. The spinning device 125 may be manually driven or electrically driven. The docking drive tube 122 has a second docking portion 1224 at a distal end, and the second docking portion 1224 is adapted to the first docking portion 1124 for transmitting a force applied to the docking drive tube 122 by an operator to the first docking portion 1124 via the second docking portion 1224. The second docking portion 1224 may be provided in a middle section of the docking drive tube 122, formed as a second recess open towards the distal end. In this embodiment, the first docking portion 1124 and the second docking portion 1224 have teeth adapted at the openings thereof to achieve the rotating effect after docking.

As shown in fig. 4, 6, when the second docking portion 1224 is docked with the first docking portion 1124, the tissue removal instrument 100 is in an engaged configuration such that the distal end of the trephine sleeve 112 is movable between a first position exposing all of the recesses 1241 and a second position fully covering the recesses 1241; when the second docking portion 1224 is disconnected from the first docking portion 1124, the tissue removal instrument 100 is in the disconnected configuration, in which the state of motion of the first docking portion 1124 is independent of the state of motion of the second docking portion 1224. Complete cutting of the tissue to be cut received within the groove 1241 is achieved by allowing the cutting portion 1122 to move between the first and second positions.

In this embodiment, the addition of the docking drive tube 122 on the basis of the trephine sleeve 112, the trephine sleeve 112 and the docking drive tube 122 enable the tissue removal instrument 100 to be converted between an engaged configuration and a disengaged configuration with the cooperation of the first docking portion 1124 and the second docking portion 1224. In the event that no cutting of the trephine sleeve 112 is required, the tissue removal instrument 100 is in the open configuration, at which point any manipulation of the abutting drive tube 122 at the manipulation assembly 120 by one end of the operator's hand is not reflected in the distal end of the trephine sleeve 112, reducing the operational risk of the procedure.

In an exemplary embodiment, as shown in fig. 8 and 9, the tissue removal instrument 100 further comprises a stop sleeve 130, the stop sleeve 130 being adapted to receive the first and second abutments 1124 and 1224, the first and second abutments 1124 and 1224 being constrained from movement within the stop sleeve 130, that is, the first and second abutments 1124 and 1224 being enclosed within the stop sleeve 130.

The stop sleeve 130 fits over the proximal portion of the trephine sleeve 112 and the distal portion of the docking drive tube 122 and receives the first docking portion 1124 and the second docking portion 1224 therein. In this embodiment, the distal end of the stop sleeve 130 has a through bore therethrough that has a radial largest dimension that is smaller than the radial smallest dimension of the first abutment 1124 to trap the first abutment 1124 inside the stop sleeve 130. The proximal end of the stop sleeve 130 is provided with a stop sleeve cap 132 having a through hole through which the tubular body portion of the docking drive tube 122 passes through the stop sleeve cap 132, the through hole having a radial largest dimension that is smaller than the radial smallest dimension of the second docking portion 1224, such that the second docking portion 1224 is received within the stop sleeve 130. Wherein the stop collar cap 132 may be coupled to the stop collar 130 by, for example, welding, threading, etc.

To avoid potential contamination within the trephine sleeve 112 when the tissue removal instrument 100 is in the open configuration, the present disclosure seals the first and second abutments 1124, 1224 within the stop sleeve 130 such that the proximal end of the trephine sleeve 112 is always in a relatively closed state in any configuration of the tissue removal instrument 100, reducing the potential for contamination within the trephine sleeve 112. Meanwhile, the relative positions of the whole of the limiting assembly 110 and the operating assembly 120 are fixed under the action of the limiting sleeve 130.

In an exemplary embodiment, as shown in fig. 8-10, there is a first resilient member 140 axially between the first interface 1124 and the distal inner wall of the stop sleeve 130.

In this embodiment, the first elastic member 140 is a spring, and in other embodiments, the first elastic member 140 may be an elastic device such as a reed, which is sleeved on the trephine sleeve 112, and has a proximal end abutting the first abutting portion 1124, and a distal end abutting against the distal inner surface of the limiting sleeve 130. As the first abutment 1124 moves distally, the first resilient member 140 is progressively compressed.

By providing the first elastic member 140 between the first docking portion 1124 and the distal inner wall of the stop sleeve 130, during operation, the docking drive tube 122 pushes the first docking portion 1124 via the second docking portion 1224, while the first docking portion 1124 is simultaneously subjected to opposite forces from the first elastic member 140 during advancement, once the tissue to be cut is undesirably severed or penetrated, the gradually compressed first elastic member 140 may act to some extent to counteract the inertia of the force of the operator, limiting the advancement of the first docking portion 1124 to a certain extent, and thus limiting the advancement of the distal end of the trephine sleeve 112 (i.e., the cutting portion 1122), reducing the operational risk of the procedure.

In an exemplary embodiment, with continued reference to fig. 8-10, when the first resilient member 140 is fully compressed by the first interface 1124, the distal end of the trephine sleeve 112 (i.e., the cutting portion 1122) is in the second position. That is, the maximum distance from the distal end of the first interface 1124 to the proximal inner surface of the stop sleeve 130 is equal to the distance from the first position to the second position of the distal end of the trephine sleeve 112 plus the distance that the first resilient element 140 is fully compressed.

Still further, to better ensure surgical safety of the distal end of the drill sleeve after the forward extension, the present disclosure defines a maximum travel distance of the first interface 1124, ensuring a maximum travel distance of the distal end of the trephine sleeve 112, i.e., the distal end of the trephine sleeve 112 travels furthest to the second position, further reducing the likelihood of the distal end of the trephine sleeve 112 causing undesirable injury to the patient.

In an exemplary embodiment, with continued reference to fig. 8-10, there is a second resilient member 150 between the first docking portion 1124 and the second docking portion 1224, the second resilient member 150 being used to maintain the tissue removal instrument 100 in the disconnected configuration.

In this embodiment, the second elastic member 150 is a spring device, and in other embodiments, the first elastic member 140 may be a spring device such as a reed, which is partially sleeved on the proximal end of the trephine sleeve 112 and partially sleeved on the distal end of the butt drive tube 122. The distal end of the second resilient member 150 abuts the bottom surface of the first recess of the first docking portion 1124 and the proximal end of the second resilient member 150 abuts the bottom surface of the second recess of the second docking portion 1224. In the relaxed state of the second elastic member 150, the first abutting portion 1124 and the second abutting portion 1224 are in a separated state.

Through the second elastic member 150, an operator can disconnect the second docking portion 1224 from the first docking portion 1124 while removing the force applied to the docking drive tube 122 after finishing cutting, saving the subsequent operation preparation time.

In an exemplary embodiment, as shown in fig. 8, the second elastic member 150 and the first elastic member 140 respectively abut against the distal inner surface and the distal outer surface of the first abutting portion 1124, that is, only under the action of the combined force of the second elastic member 150 and the first elastic member 140, the position of the first abutting portion 1124 in the limiting sleeve 130 is always unchanged, that is, only under the action of the second elastic member 150, the second abutting portion 1224 always abuts against the limiting sleeve 130. That is, the distal end of the trephine sleeve 112 is in the first position only under the combined force of the second resilient member 150 and the first resilient member 140.

The resultant force of the second elastic member 150 and the first elastic member 140 fixes the positions of the first docking portion 1124 and the second docking portion 1224 within the limiting sleeve 130 without applying an external force.

The first abutting portion 1124 is reset by the cooperation of the second elastic member 150 and the first elastic member 140. When the operator applied force is withdrawn, the first interface 1124 can return to the original position, and the distal end of the trephine sleeve 112 returns to the first position, further saving subsequent operational preparation time.

In an exemplary embodiment, the second elastic member 150 has an elasticity smaller than that of the first elastic member 140.

Because the first elastic member 140 has a relatively high elasticity, the second docking portion 1224 is preferentially docked with the second docking portion 1224 when the second docking portion 1224 is advanced, and then moves along with the movement of the second docking portion 1224, so as to better transfer the motion from the docking driving tube 122 during the advancing process of the trephine sleeve 112.

In an exemplary embodiment, as shown in fig. 7, 11 and 12, the limiting assembly 110 further includes a telescopic sleeve, which includes a receiving sleeve 115 and a telescopic member 113, from far to near along the first direction, where the receiving sleeve 115 is sleeved outside the trephine sleeve 112 and can move telescopically relative to the trephine sleeve 112. The telescopic member comprises an inner sleeve 1131 and an outer sleeve 1132, wherein the inner circumference of the outer sleeve 1132 is provided with an inner threaded part, the inner sleeve 1131 is inserted into the outer sleeve 1132, the outer circumference of the inner sleeve 1131 is provided with an outer threaded part matched with the inner threaded part, and the inner sleeve 1131 is fixed relative to the limiting assembly 110 in the position of the first direction.

As outer sleeve 1132 rotates relative to inner sleeve 1131, outer sleeve 1132 moves axially relative to inner sleeve 1131. The receiving sleeve 115 is fixedly connected at a proximal end to a proximal end of the outer sleeve 1132 in a first direction through portions of the inner sleeve 1131 and the outer sleeve 1132. As such, the length of the receiving sleeve 115 at the distal receiving trephine sleeve 112 is adjusted by the telescoping movement of the outer sleeve 1132 relative to the inner sleeve 1131 such that the distal end of the receiving sleeve 115 is movable between a third position exposing all of the grooves 1241 and a fourth position completely covering the grooves 1241, the distal outer surface of the stop sleeve 130 defining the furthest distance of proximal movement of the telescoping member, that is, the distal end of the receiving sleeve 115 is in the third position when the telescoping member 113 contacts the stop sleeve 130.

Since the receiving sleeve 115 serves to receive the cut tissue, the cut tissue is prevented from falling into the patient. Therefore, the receiving sleeve 115 needs to be operated after the cutting work is completed. To ensure that the cutting action of the cutting cannula is not interfered with, in the present disclosure, the receiving cannula 115 is positioned at a third position exposing all of the recesses 1241 at its distal end prior to the receiving action.

In an exemplary embodiment, as shown in fig. 13, from distal to proximal in a first direction, the stop assembly 110 further comprises a positioning probe 116 and a stop block 117, the positioning probe 116 being adapted to distally position the tissue removal instrument 100 within the patient, the stop block 117 being secured to the proximal end of the positioning probe 116, the stop block 117 having a first through slot extending axially therethrough, the receiving sleeve 115 extending through the first through slot 1171 in the first direction, the telescoping member 113 being configured to slide along the first through slot 1171.

Specifically, during the surgical procedure, as the positioning probe 116 is advanced, the receiving cannula 115 also enters the patient. Positioning probe 116 is distally positioned within the patient's body and inner sleeve 1131 is operable to slide along first throughslot 1171, housing sleeve 115 and trephine sleeve 112 and tissue probe 124 housed therein being movable with movement of inner sleeve 1131. As the depth of cut for the target tissue increases, the position of the receiving cannula 115 within the first channel 1171 is adjusted by sliding the inner cannula along the first channel 1171, indirectly moving the positions of the trephine cannula 112 and tissue probe 124. The positioning probe 116 is positioned within the patient at the distal-most end, that is, the positioning probe 116 allows the tissue removal instrument 100 to be tilted at multiple angles with the distal-most end of the positioning probe 116 as a support point to achieve a greater range of cuts.

Specifically, the proximal end of inner sleeve 1131 snaps into first channel 1171 such that movement thereof in a first direction is limited, enabling controlled telescoping adjustment of receiving sleeve 115 in the first direction.

In this embodiment, the proximal end of the inner sleeve 1131 is clamped in the second through slot 1172 formed along the side surface of the first through slot 1171, and the second through slot 1242 penetrates the stopper 117, so that the proximal end of the inner sleeve 1131 is exposed out of the second through slot 1172, which is convenient for operation.

Because the overall length of the telescoping member can be adjusted while the telescoping member is slid along the first channel 1171, the telescoping member, as well as the trephine sleeve 112 and tissue probe 124 disposed within it, can have a sufficient range of movement while maintaining smooth operation while the distal end of the positioning probe is secured within the patient.

In an exemplary embodiment, with continued reference to fig. 5, the distal wall 1242 of the recess 1241 of the tissue probe 124 is provided with serrations. When the tissue to be cut is gripped and cut by the distal wall 1242 of the groove 1241 and the cutting portion 1122, the present disclosure reduces the likelihood of tissue slippage by providing serrations on the distal wall 1242 so as to increase friction between the tissue and the groove 1241 in order to reduce the occurrence of tissue slippage during cutting.

It should be understood that the term "include" and variations thereof as used in this disclosure are intended to be open-ended, i.e., including, but not limited to. The term "one embodiment" means "at least one embodiment," and the term "another embodiment" means "at least one other embodiment.

The specific features (elements) described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the disclosure does not further describe various possible combinations.

The foregoing is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art will recognize that changes and substitutions are within the technical scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A tissue removal instrument for use in surgery, comprising,

a stop assembly having a trephine sleeve with a cutting portion at a distal end, a first docking portion at a proximal end, and

an operating assembly having a docking drive tube with a second docking portion at a distal end, and the second docking portion is adapted to the first docking portion.

2. The tissue removal instrument of claim 1, wherein the operating assembly further has a tissue probe extending axially into the trephine sleeve via the first docking portion, the tissue probe having a recess at a distal end adapted to cooperate with the cutting portion to complete cutting of tissue, the tissue removal instrument being in an engaged configuration when the second docking portion is docked with the first docking portion such that the cutting portion is movable between a first position exposing all of the recesses and a second position fully covering the recesses; when the second docking portion is disconnected from the first docking portion, the tissue removal instrument is in a disconnected configuration, in which the state of motion of the first docking portion is independent of the state of motion of the second docking portion.

3. The tissue removal instrument of claim 2, further comprising a stop sleeve adapted to receive the first and second abutments, the first and second abutments being constrained from movement within the stop sleeve.

4. The tissue removal instrument of claim 3, wherein a first resilient member is axially between the first interface and the distal inner wall of the stop sleeve.

5. The tissue removal instrument of claim 4, wherein the distal end of the trephine sleeve is in the second position when the first resilient member is fully compressed by the first abutment.

6. The tissue removal instrument of claim 5, wherein a second resilient member is provided between the first and second abutments for maintaining the tissue removal instrument in the disconnected configuration.

7. The tissue removal instrument of claim 6, wherein the second resilient member and the first resilient member abut a distal inner surface and a distal outer surface of the first docking portion, respectively.

8. The tissue removal instrument of claim 7, wherein the second resilient member is less resilient than the first resilient member.

9. The tissue removal instrument of claim 3, wherein the stop assembly further has a telescoping assembly comprising a receiving sleeve and a telescoping member, the telescoping member adapted to adjust the length of the receiving sleeve distally receiving the tissue probe such that the distal end of the receiving sleeve is movable between a third position exposing all of the grooves and a fourth position just completely surrounding the grooves, the distal outer surface of the stop sleeve defining a distal-most distance of proximal movement of the telescoping member.

10. The tissue removal instrument of claim 9, wherein the operating assembly further comprises a positioning probe adapted to distally position the tissue removal instrument within the patient, and a stop secured to a proximal end of the positioning probe, the stop having a first through slot extending axially therethrough, the telescoping member configured to slide along the first through slot.

11. The tissue removal instrument of claim 2, wherein a distal wall of the recess of the tissue probe is provided with serrations.