CN111643159B - Laparoscopic surgical knife - Google Patents

Abstract

The invention discloses a laparoscopic surgical knife which comprises a knife cylinder, a surgical knife and a locking piece, wherein the knife cylinder is provided with a proximal end and a distal end; the surgical knife comprises a knife handle and a blade, wherein the knife handle is arranged in the knife cylinder in a penetrating way and is provided with an operation end and a connection end, the operation end extends out of the distal end and is operated by a user to drive the knife handle to slide between an extending position and a retracting position along the axis of the knife cylinder, and the blade is detachably arranged at the connection end; the locking piece is arranged between the cutter cylinder and the cutter handle; when the knife handle is in the retracted position, the blade is accommodated inside the proximal end; when the knife handle slides from the retracted position to the extended position, the blade extends from the proximal end, and the locking member locks and secures the knife handle relative to the knife cylinder. According to the laparoscopic surgical knife provided by the invention, the blade of the surgical knife can extend out of the knife cylinder or be recycled and hidden in the knife cylinder, so that the laparoscopic surgical knife is safe and convenient to use, the problems of accidental scratches, cross infection and the like can be prevented, in addition, the blade is disposable and can be detached and replaced, and other parts can be reused after being disinfected.

Description

Laparoscopic surgical knife

Technical Field

The invention relates to a surgical instrument, in particular to a laparoscopic surgical knife.

Background

Laparoscopic surgery is a newly developed minimally invasive surgical method, and is a necessary trend for the development of future surgical methods. Along with the rapid progress of industrial manufacturing technology, the fusion of relevant disciplines lays a firm foundation for developing new technologies and new methods, and doctors are more and more skilled to operate, so that a plurality of past open operations are replaced by intracavity operations at present, and the operation selection opportunities are greatly increased.

In laparoscopic surgery, a surgical knife is usually required to cut bile duct, blood vessel, ureter and the like finely, the surgical knife has a structure of a handle and a blade arranged on the handle, the blade is exposed in the external environment before and after the surgical knife is used, the problems of accidental scratches, cross infection and the like are easily caused, the blade cannot be replaced, the blade becomes blunt, the cutting is difficult, and the damage and the like are easily caused.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, the invention aims to propose a laparoscopic surgical tool.

To achieve the above object, a laparoscopic surgical tool according to an embodiment of the present invention includes:

A cartridge having a proximal end and a distal end;

The surgical knife comprises a knife handle and a knife blade, wherein the knife handle is arranged in the knife cylinder in a penetrating mode and is provided with an operation end and a connection end, the operation end extends out of the distal end and is operated by a user to drive the knife handle to slide between the extending position and the retracting position along the axis of the knife cylinder, and the knife blade is detachably arranged at the connection end;

The locking piece is arranged between the cutter cylinder and the cutter handle;

when the handle is in the retracted position, the blade is received within the proximal end;

The blade extends from the proximal end when the handle is slid from the retracted position to the extended position, and the locking member locks the handle relative to the cartridge to retain the blade outside of the proximal end.

According to the laparoscopic surgical knife provided by the embodiment of the invention, a user can operate and drive the knife handle to slide between the extending position and the retracting position along the axis of the knife cylinder, when the knife handle slides from the retracting position to the extending position, the knife blade extends out of the proximal end of the knife cylinder, and the knife handle and the knife cylinder are relatively locked and fixed by the locking piece, so that the knife blade of the scalpel can be kept outside the proximal end of the knife cylinder, that is, can extend out of the knife cylinder or be recycled and hidden in the knife cylinder, so that the knife blade can be retracted and hidden in the knife cylinder before or after use, the problems of accidental scratches, cross infection and the like are prevented. Further, the blade is disposable, and can be detached and replaced, for example, blades of different types and/or sizes, such as blades of number 10, number 11, number 12, number 15, number 17 and the like, can be replaced, and other parts can be reused after being sterilized.

In addition, the laparoscopic surgical knife according to the above embodiment of the present invention may have the following additional technical features:

according to one embodiment of the invention, the proximal end is provided with an annular expansion part extending along the axis of the cutter cylinder, the annular expansion part is expandable along the radial direction of the cutter cylinder, the inner wall of the annular expansion part is provided with a stop button, the outer peripheral wall of the cutter handle is provided with an annular stop shoulder, and the annular stop shoulder is adjacent to the operation end;

when the handle slides from the retracted position to the extended position, the annular shoulder moves inward toward the distal end and forces the annular expansion portion to expand, then enters the annular expansion portion and snaps with the stop catch to prevent the handle from sliding toward the retracted position.

According to one embodiment of the invention, the annular expansion has an external thread, the wall of the annular expansion has at least two cutouts, the two cutouts being arranged at intervals in the circumferential direction of the annular expansion, each cutout extending in the axial direction of the cartridge;

the locking piece is a nut, the nut is matched with the external thread of the annular expansion part, and the length of the external thread is larger than the thickness of the nut, so that the nut moves between a locking position and a disassembling position;

the nut coincides with the cutout to limit expansion of the annular expansion when the nut is in the locked position and is misaligned with the cutout to allow expansion of the annular expansion when the nut is in the disassembled position.

According to one embodiment of the invention, the tool holder further comprises a first resilient member disposed between the tool shank and the tool cartridge to provide a first resilient force urging the tool shank to slide toward the retracted position.

According to one embodiment of the invention, the inner wall of the cutter barrel is provided with a step part, the first elastic piece is a first spring, the first spring is sleeved on the cutter handle, one end of the first spring abuts against the step part, and the other end of the first spring abuts against the annular retaining shoulder.

According to one embodiment of the invention, the connecting end comprises a rod part, the rod part is cut by an axial plane to form a missing part and a retaining part opposite to the missing part, the retaining part is provided with a loading surface parallel to the axis of the rod part, the loading surface is provided with a non-circular positioning protrusion, and the blade is provided with a positioning hole matched with the positioning protrusion.

According to one embodiment of the invention, the scalpel further comprises a quick release member provided on the lever portion and sliding in an axial direction of the lever portion between a combined position and a disassembled position;

When the quick release member is located at the combined position, the quick release member is located in the missing portion, so that the blade is clamped between the retaining portion and the quick release member, and when the quick release member is located at the disassembling position, the quick release member is dislocated from the retaining portion, so that the positioning hole is allowed to be separated from the positioning protrusion to detach the blade.

According to one embodiment of the invention, the quick release comprises:

the sleeve part is sleeved on the rod part in a sliding manner;

The side pressing part is positioned in the missing part when the quick-dismantling piece is positioned at the combined position, the side blocking surface is opposite to the loading surface, so that the blade is clamped between the side blocking surface and the loading surface, and the side pressing part is dislocated with the retaining part when the quick-dismantling piece is positioned at the dismantling position.

According to one embodiment of the invention, the side baffle surface is provided with an avoidance groove, one end of the avoidance groove, which is close to the blade, is opened to form an opening, and one end of the avoidance groove, which is far away from the blade, is closed to form a limiting surface;

The height of the positioning bulge is larger than the depth of the positioning hole, the positioning bulge is in sliding fit with the avoidance groove, and when the quick-dismantling piece slides from the dismantling position to the combining position, the limiting surface abuts against one end, away from the blade, of the positioning bulge.

According to one embodiment of the invention, the scalpel further comprises a second elastic member disposed between the quick release member and the connecting end for providing a second elastic force urging the quick release member to slide toward the assembled position.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the laparoscopic surgical knife (handle in extended position) according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic view of the laparoscopic surgical knife (handle in retracted position) according to an embodiment of the present invention;

FIG. 4 is a partial enlarged view at B in FIG. 3;

FIG. 5 is a cross-sectional view of a laparoscopic surgical tool (with the handle in an extended position) according to an embodiment of the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 5 at C;

FIG. 7 is a partial enlarged view at D in FIG. 5;

FIG. 8 is a schematic view of the structure of a scalpel in a laparoscopic surgical cutter according to an embodiment of the present invention;

FIG. 9 is a schematic view of a portion of a scalpel in a laparoscopic surgical knife according to an embodiment of the present invention;

FIG. 10 is a partially exploded view of a scalpel in a laparoscopic surgical knife according to an embodiment of the present invention;

Fig. 11 is a partially exploded view of a surgical knife in a laparoscopic surgical knife according to an embodiment of the present invention.

Reference numerals:

a cutter barrel 10;

a distal end D10;

A proximal end D11;

An annular expansion portion 101;

A slit H101;

an expansion sheet 1011;

Stop button 1012;

A step 102;

A surgical knife 20;

a connection end D20;

an operation end D21;

a shank 201;

an annular stop shoulder 2011;

a blade 202;

Positioning holes 2021;

A quick release 203;

A sleeve portion 2031;

A side pressure portion 2032;

Avoidance groove H203;

A second elastic member 204;

A stem 205;

A missing portion 2051;

a retention portion 2052;

positioning protrusions 2053;

A locking member 30;

the first elastic member 40.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present invention and should not be construed as limiting the invention, and all other embodiments, based on the embodiments of the present invention, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The laparoscopic surgical knife according to the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 11, a laparoscopic surgical knife according to an embodiment of the present invention may be used for laparoscopic surgery, and includes a knife cylinder 10, a surgical knife 20, and a locking member.

Specifically, the cartridge 10 has a proximal end D11 and a distal end D10, wherein the proximal end D11 refers to an end that is proximal to the patient at the time of surgery and the distal end D10 refers to an end that is distal to the patient at the time of surgery.

The scalpel 20 comprises a scalpel handle 201 and a blade 202, wherein the scalpel handle 201 is arranged in the scalpel barrel 10 in a penetrating mode and is provided with an operating end D21 and a connecting end D20, the operating end D21 extends out of the distal end D10 and is operated by a user to drive the scalpel handle 201 to slide along the axis of the scalpel barrel 10 between the extending position and the retracting position, and the blade 202 is detachably arranged at the connecting end D20. That is, a user may push and pull handle 201 through operating end D21, causing handle 201 and blade 202 on handle 201 to slide between the extended and retracted positions. The blade 202 is detachably arranged at the connecting end, so that the blade 202 can be conveniently installed or detached, and different types of blades can be replaced according to the requirements of the operation.

A locking member 30 is provided between the cutter barrel 10 and the cutter handle 201, and the locking member 30 is used for locking and fixing the cutter barrel 10 and the cutter handle 201. When the handle 201 is in the retracted position, the blade 202 is received within the proximal end D11. When the handle 201 is slid from the retracted position to the extended position, the blade 202 extends from the proximal end D11, and the locking member 30 locks the handle 201 and the cartridge 10 relative to each other so that the blade 202 remains outside the proximal end D11.

That is, when the handle 201 is in the retracted position, the blade 202 is positioned inside the proximal end D11 of the cartridge 10, and before use, the blade 202 can be held inside the cartridge 10 to prevent accidental scratches, and after use, the blade 202 can be retracted to the retracted position to prevent accidental punctures and cross-infection. When surgery is desired, the user may manipulate handle 201 such that handle 201 slides from the retracted position to the extended position, at which point blade 202 is positioned outside proximal end D11 of cartridge 10, such that surgery may be performed using blade 202.

According to the laparoscopic surgical knife provided by the embodiment of the invention, a user can operate and drive the knife handle 201 to slide between the extending position and the retracting position along the axis of the knife cylinder 10, when the knife handle 201 slides from the retracting position to the extending position, the knife blade 202 extends out of the proximal end D11 of the knife cylinder 10, and the locking piece 30 locks and fixes the knife handle 201 and the knife cylinder 10 relatively, so that the knife blade 202 is kept outside the proximal end D11 of the knife cylinder 10, that is, the knife blade 202 of the scalpel 20 can extend out of the knife cylinder 10 or be recovered and hidden in the knife cylinder 10, so that the knife blade 202 can be recovered and hidden in the knife cylinder 10 before or after use, and the problems of accidental scratches, cross infection and the like are prevented. The blade is disposable, can dismantle the change, for example can change the blade of different models and/or size, for example the blade such as 10, 11, 12, 15, 17 etc. and other parts can be reused after the disinfection treatment.

Referring to fig. 1 to 6, in one embodiment of the present invention, the distal end D10 has an annular expansion portion 101 extending along the axis of the cutter barrel 10, the annular expansion portion 101 is expandable in the radial direction of the cutter barrel 10, the inner wall of the annular expansion portion 101 is provided with a stopper 1012, the outer peripheral wall of the cutter handle 201 is provided with an annular shoulder 2011, and the annular shoulder 2011 is adjacent to the operation end D21.

When the handle 201 slides from the retracted position to the extended position, the annular shoulder 2011 moves inward toward the distal end D10 and forces the annular expansion 101 to expand, then enters the annular expansion 101 and snaps with the stop 1012 to prevent the handle 201 from sliding toward the retracted position.

That is, the outer diameter of the annular shoulder 2011 on the tool shank 201 is greater than the distance from the stop button 1012 to the axis of the annular expansion part 101, when the user slides the tool shank 201 from the retracted position to the extended position, the annular shoulder 2011 moves into the annular expansion part 101, when the annular shoulder 2011 contacts with the stop button 1012, the tool shank 201 is pushed continuously, the annular shoulder 2011 is extruded by the stop button 1012, so that the annular expansion part 101 expands radially outwards, finally, the annular shoulder 2011 slides over the stop button 1012 and enters into the annular expansion part 101, and the annular shoulder 2011 is stopped at one side of the stop button 1012 away from the distal end D10, at this time, the annular shoulder 2011 and the stop button 1012 form a buckled state, and the resistance of the stop button 1012 needs to be overcome when the tool shank 201 moves to the retracted position by the stop action between the annular shoulder 2011 and the stop button 1012.

Therefore, by utilizing the cooperation of the stop buckle 1012 and the annular stop shoulder 2011, the knife handle 201 is not easy to retract to the retracted position, and the locking and fixing effects of the knife cylinder 10 and the knife handle 201 by the locking piece 30 are matched, so that the blade 202 can be ensured to be outside the proximal end D11 of the knife cylinder 10, the operation is convenient, and the use reliability of the laparoscopic surgical knife is ensured.

In the present embodiment, by using the expansion effect of the annular expansion portion 101, when the tool shank 201 slides to the extended position, the stop button 1012 and the annular shoulder 2011 can be automatically buckled to form a blocking effect, which is very convenient to use.

Advantageously, the annular expansion 101 has an external thread, the wall of the annular expansion 101 having at least two cutouts H101, the two cutouts H101 being spaced apart in the circumferential direction of the annular expansion 101, each cutout H101 extending in the axial direction of the cartridge 10.

The locking member 30 is a nut that mates with the external thread of the annular expansion 101 and has a length that is greater than the thickness of the nut to move the nut between the locked and unlocked positions. When the nut is in the locked position, the nut coincides with the cutout H101 to restrict expansion of the annular expansion portion 101, and when the nut is in the disassembled position, the nut is dislocated from the cutout H101 to allow expansion of the annular expansion portion 101.

That is, at least two cutouts H101 are provided at intervals in the circumferential direction on the annular expansion portion 101, so that the annular expansion portion 101 is formed with a plurality of expansion pieces 1011, and the expansion pieces 1011 can be expanded and deformed radially outward. The nut is in threaded engagement with the annular expansion portion 101, and the nut can be switched between a locking position and a disassembling position along the axis of the cutter barrel 10 by rotating the nut, when the nut moves to the locking position, the nut is bound on the periphery of the expansion sheet 1011 due to superposition of the nut and the notch H101, so that the expansion sheet 1011 cannot expand radially outwards, and when the nut moves to the disassembling position, the nut removes the restriction on the expansion sheet 1011 due to dislocation of the nut and the notch H101, so that the expansion sheet 1011 can expand outwards when being subjected to radially outwards force.

In a specific application, in an initial state, the nut is switched to the disassembled position, at this time, the annular expansion portion 101 can be expanded, when a surgery is needed, a user operates the tool shank 201 to slide towards the extended position, in this process, the annular shoulder 2011 acts with the stop button 1012 to enable the expansion sheet 1011 to be expanded outwards under the radial outward effect, the annular shoulder 2011 can enter the annular expansion portion 101 after the expansion sheet 1011 is expanded and stop on one side of the stop button 1012 far away from the distal end D10, and then the nut is switched to the locked position, at this time, the nut coincides with the notch H101, the nut is bound on the periphery of the expansion sheet 1011, so that the expansion sheet 1011 cannot be expanded outwards in the radial direction, further the tool shank 201 is ensured to be kept at the extended position, and the blade 202 is kept outside the proximal end D11. After the operation, the nut can be switched to the disassembly position, at this time, the annular expansion part 101 can be expanded, the user operates the knife handle 201 to slide towards the retraction position, in this process, the annular shoulder 2011 also acts with the stop button 1012, so that the expansion sheet 1011 is expanded outwards under the radial outward effect, the annular shoulder 2011 can be withdrawn from the annular expansion part 101 to the outside of the distal end D10 after the expansion sheet 1011 is expanded, and the blade 202 can be retracted and hidden inside the proximal end D11.

In this embodiment, the annular expansion portion 101 with the above structure is adopted, and the locking member 30 is configured as a nut, so that the nut is used to limit the expansion of the annular expansion portion 101 or release the restriction of the annular expansion portion 101 by switching between the locking position and the dismantling position, thereby realizing the locking and fixing of the knife handle 201 and the knife cylinder 10, which is convenient to operate, and particularly can ensure that the surgical knife 20 can be reliably maintained in the extended position, preventing the problem of accidental retraction.

Referring to fig. 1-6, in some embodiments of the present invention, a first resilient member 40 is further included, the first resilient member 40 being disposed between the handle 201 and the cartridge 10 to provide a first resilient force urging the handle 201 to slide toward the retracted position.

That is, when no other external force is interposed, the first elastic force provided by the first elastic member 40 can force the knife handle 201 to move towards the retracted position, in this process, the knife handle 201 can be ensured to return to the retracted position against the resistance of the stop button 1012, so that when the knife blade 202 is needed to be hidden after operation, the nut is only required to be switched to the disassembled position, at this time, the first elastic force provided by the first elastic member 40 can automatically push the knife handle 201 to return to the retracted position, and further the knife blade 202 is retracted and hidden in the proximal end D11, thereby being more convenient to use.

Referring to fig. 6, in one embodiment of the present invention, a step 102 is provided on an inner wall of the cutter barrel 10, the first elastic member 40 is a first spring, the first spring is sleeved on the cutter handle 201, one end of the first spring abuts against the step 102, and the other end of the first spring abuts against the annular shoulder 2011.

That is, the first spring abuts between the stepped portion 102 and the annular shoulder 2011 in the cutter barrel 10, thus facilitating the installation of the first spring, and the first elastic force provided by the first spring can ensure that the cutter handle 201 is smoothly and reliably returned to the retracted position.

Referring to fig. 7 to 11, in some embodiments of the present invention, the connection end D20 includes a stem 205, where the stem 205 is cut by an axial plane to form a missing portion 2051 and a retaining portion 2052 opposite to the missing portion 2051, where the retaining portion 2052 has a loading surface parallel to the axis of the stem 205, where the loading surface is provided with a non-circular positioning protrusion 2053, and where the blade 202 is provided with a positioning hole 2021 that mates with the positioning protrusion 2053.

That is, a part of the shaft 205 is cut out as a missing portion 2051, and the remaining part after the cutting out is a retaining portion 2052, a loading surface is formed by cutting out the axial plane on the retaining portion 2052, a positioning protrusion 2053 is provided on the loading surface, when the blade 202 is mounted, a positioning hole 2021 on the blade 202 can be sleeved on the positioning protrusion 2053, and the blade 202 is ensured to be closely attached to the loading surface, so that the blade 202 is relatively fixed in the axial direction of the shaft 205, and in addition, since the positioning protrusion 2053 is non-circular, such as a waist shape, a rectangle shape, etc., the positioning hole 2021 is matched with the shape of the positioning protrusion 2053 correspondingly, when the positioning hole 2021 of the blade 202 is matched with the positioning protrusion 2053 on the loading surface, the blade 202 is not circumferentially rotated, and the blade 202 is ensured to be reliably fixed.

In this embodiment, the positioning protrusion 2053 is matched with the positioning hole 2021, so that the blade 202 can be conveniently installed, removed and replaced.

Referring to fig. 7 to 11, in one embodiment of the present invention, the surgical knife 20 further includes a quick release 203, the quick release 203 being provided on the lever 205 and sliding along the axial direction of the lever 205 between a combined position and a disassembled position.

When the quick release 203 is in the assembled position, the quick release 203 is positioned in the missing portion 2051 such that the blade 202 is sandwiched between the retaining portion 2052 and the quick release 203, and when the quick release 203 is in the disassembled position, the quick release 203 is misaligned with the retaining portion 2052 to allow the positioning hole 2021 to disengage from the positioning protrusion 2053 to disassemble the blade 202.

That is, the quick release 203 can slide between the assembling position and the disassembling position, when the quick release 203 slides to the assembling position, the quick release 203 is opposite to the retaining portion 2052, and the quick release 203 presses the blade 202 on the loading surface, so that the blade 202 is ensured to be more stable on the one hand, and the blade 202 cannot be separated from the positioning protrusion 2053 on the other hand. When the quick release 203 slides from the assembling position to the disassembling position, the quick release 203 is dislocated from the retaining portion 2052, so that the positioning protrusion 2053 is exposed, and at this time, since the quick release 203 has no restriction on the blade 202, the blade 202 can be separated from the positioning protrusion 2053, thereby realizing the disassembly of the blade 202.

In this embodiment, the quick release member 203 is switched between the combination position and the disassembly position, so as to quickly press and fix the blade 202 and quickly detach the blade 202, which is simple and convenient to use.

In addition, it should be noted that, in the related art, the blade 202 is mounted and dismounted by clamping the bayonet and the protrusion between the blade 202 and the handle 201, but in this mounting manner, the reliability of fixing the blade 202 is poor, and there is a risk of falling off from the handle 201, but if falling off in the human body during operation, a safety accident may be caused, in this embodiment, when the positioning protrusion 2053 cooperates with the positioning hole 2021 to fix the blade 202, and when the quick release member 203 slides to the combined position, the blade 202 can be clamped between the retaining portion 2052 and the quick release member 203, so that the blade 202 can be ensured to be fixed more reliably, and no risk of falling off or the like occurs.

Referring to fig. 9 to 11, in one embodiment of the present invention, the quick release 203 includes a sleeve portion 2031 and a lateral pressure portion 2032, wherein the sleeve portion 2031 is slidably sleeved on the lever portion 205.

The side pressing portion 2032 and one end of the sleeve portion 2031 near the blade 202, the side pressing portion 2032 has a side blocking surface, when the quick release 203 is in the assembled position, the side pressing portion 2032 is located in the missing portion 2051, the side blocking surface faces the loading surface so that the blade 202 is sandwiched between the side blocking surface and the loading surface, and when the quick release 203 is in the disassembled position, the side pressing portion 2032 and the retaining portion 2052 are dislocated.

That is, the sleeve portion 2031 is slidable along the shaft portion 205 between the assembled position and the disassembled position, and the side pressure portion 2032 is connected to the sleeve portion 2031 at an end near the blade 202 and is slidable along with the sleeve portion 2031, when the sleeve portion 2031 slides, the side pressure portion 2032 is switched to be opposite to or offset from the reserved portion 2052, when the side pressure portion 2032 is opposite to the reserved portion 2052, the blade 202 is clamped between the side pressure portion 2032 and the reserved portion 2052, and when the side pressure portion 2032 is offset from the reserved portion 2052, the positioning protrusion 2053 is exposed to facilitate disassembly and replacement of the blade 202.

In this embodiment, the sleeve portion 2031 is slidably connected to the lever portion 205, so that the quick release 203 can be ensured to slide smoothly and reliably on the lever portion 205, and the combination position and the disassembly position can be switched smoothly. The use side pressure portion 2032 presses the blade 202, thereby ensuring the fixing of the blade 202.

Referring to fig. 9 to 10, in one embodiment of the present invention, a relief groove H203 is formed on the side blocking surface, an end of the relief groove H203 near the blade 202 is opened to form an opening, and an end of the relief groove H203 far from the blade 202 is closed to form a limiting surface. The height of the positioning protrusion 2053 is greater than the depth of the positioning hole 2021, the positioning protrusion 2053 is in sliding fit with the avoidance groove H203, and when the quick release 203 slides from the disassembly position to the combination position, the limiting surface abuts against one end of the positioning protrusion 2053 away from the blade 202.

When the quick release member 203 is in the combined position, the positioning boss 2053 is located in the avoidance groove H203, and the limiting surface abuts against one end, far away from the blade 202, of the positioning boss 2053, so that the limiting effect of the limiting surface can be utilized to ensure that the quick release member 203 just slides to the combined position, and when the quick release member 203 slides from the combined position to the disassembled position, the positioning boss 2053 slides out of the opening of the avoidance groove H203 to ensure that the positioning boss 2053 can be completely exposed, and the blade 202 is convenient to detach and replace.

It will be appreciated that the side pressing portion 2032 and the sleeve portion 2031 may be detachably connected, for example, by a screw, and after the sleeve portion 2031 is sleeved on the lever portion 205, the side pressing portion 2032 is mounted in the notch portion, and finally the side pressing portion 2032 and the sleeve portion 2031 are connected and fixed by the screw.

Referring to fig. 7 to 11, in one embodiment of the present invention, the surgical knife 20 further includes a second elastic member 204, where the second elastic member 204 is disposed between the quick release member 203 and the connecting end D20, so as to provide a second elastic force for forcing the quick release member 203 to slide toward the combined position.

When the quick release member 203 is slid from the assembled position to the disassembled position, the second elastic member 204 is compressed, the positioning protrusion 2053 is exposed, at this time, the positioning groove of the blade 202 is matched with the positioning protrusion 2053, and when the quick release member 203 is released, the second elastic member 204 recovers to deform to force the quick release member 203 to return to the assembled position, so that the quick release member 203 can be quickly installed, and under the second elastic action of the second elastic member 204, the quick release member 203 can be ensured to be kept at the assembled position, and the reliable installation of the blade 202 can be ensured.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (3)

1. A laparoscopic surgical tool, comprising:

A cartridge having a proximal end and a distal end;

The surgical knife comprises a knife handle and a knife blade, wherein the knife handle is arranged in the knife cylinder in a penetrating mode and is provided with an operation end and a connection end, the operation end extends out of the distal end and is operated by a user to drive the knife handle to slide between an extending position and a retracting position along the axis of the knife cylinder, and the knife blade is detachably arranged at the connection end;

The locking piece is arranged between the cutter cylinder and the cutter handle;

when the handle is in the retracted position, the blade is received within the proximal end;

When the handle is slid from the retracted position to the extended position, the blade extends from the proximal end and the locking member locks the handle relative to the cartridge to retain the blade outside of the proximal end;

The distal end is provided with an annular expansion part extending along the axis of the cutter barrel, the annular expansion part can expand along the radial direction of the cutter barrel, the inner wall of the annular expansion part is provided with a stop button, the outer peripheral wall of the cutter handle is provided with an annular stop shoulder, and the annular stop shoulder is adjacent to the operation end; when the knife handle slides from the retracted position to the extended position, the annular stop shoulder moves inwards towards the distal end and forces the annular expansion part to expand, and then enters the annular expansion part and is buckled with the stop buckle so as to prevent the knife handle from sliding towards the retracted position;

The annular expansion part is provided with external threads, the wall of the annular expansion part is provided with at least two notches, the two notches are arranged at intervals in the circumferential direction of the annular expansion part, and each notch extends along the axial direction of the cutter barrel; the locking piece is a nut, the nut is matched with the external thread of the annular expansion part, and the length of the external thread is larger than the thickness of the nut, so that the nut moves between a locking position and a disassembling position; when the nut is in the locked position, the nut coincides with the cutout to limit expansion of the annular expansion, and when the nut is in the disassembled position, the nut is misaligned with the cutout to allow expansion of the annular expansion;

the laparoscopic surgical tool also includes a first resilient member disposed between the handle and the cartridge to provide a first resilient force urging the handle to slide toward the retracted position;

The inner wall of the cutter barrel is provided with a step part, the first elastic piece is a first spring, the first spring is sleeved on the cutter handle, one end of the first spring abuts against the step part, and the other end of the first spring abuts against the annular stop shoulder;

The connecting end comprises a rod part, the rod part is cut by an axial plane to form a missing part and a reserved part opposite to the missing part, the reserved part is provided with a loading surface parallel to the axis of the rod part, the loading surface is provided with a non-circular positioning bulge, and the blade is provided with a positioning hole matched with the positioning bulge;

The surgical knife further comprises a quick-dismantling piece, wherein the quick-dismantling piece is arranged on the rod part and slides between a combined position and a dismantling position along the axial direction of the rod part; when the quick release member is positioned at the combined position, the quick release member is positioned in the missing part so as to enable the blade to be clamped between the retaining part and the quick release member, and when the quick release member is positioned at the disassembling position, the quick release member is misplaced with the retaining part so as to allow the positioning hole to be separated from the positioning protrusion to detach the blade;

The quick release piece comprises a sleeve part and a side pressure part, and the sleeve part is slidably sleeved on the rod part; the side pressing part is provided with a side blocking surface, when the quick-dismantling part is positioned at the combined position, the side pressing part is positioned in the missing part, the side blocking surface is opposite to the loading surface, so that the blade is clamped between the side blocking surface and the loading surface, and when the quick-dismantling part is positioned at the dismantling position, the side pressing part is staggered with the retaining part.

2. The laparoscopic surgical knife according to claim 1, wherein the side stop surface is provided with a relief groove, one end of the relief groove, which is close to the blade, is opened to form an opening, and one end of the relief groove, which is far away from the blade, is closed to form a limiting surface;

The height of the positioning bulge is larger than the depth of the positioning hole, the positioning bulge is in sliding fit with the avoidance groove, and when the quick-dismantling piece slides from the dismantling position to the combining position, the limiting surface abuts against one end, away from the blade, of the positioning bulge.

3. The laparoscopic surgical knife of claim 1, further comprising a second resilient member disposed between said quick disconnect and said connecting end for providing a second resilient force forcing said quick disconnect to slide toward said assembled position.