CN111643159A - Laparoscope surgical knife - Google Patents

Abstract

The invention discloses a laparoscopic surgical knife, which comprises a knife cylinder, a scalpel and a locking piece, wherein the knife cylinder is provided with a near end and a far end; the scalpel comprises a scalpel handle and a blade, the scalpel handle is arranged in the scalpel barrel in a penetrating mode and provided with an operating end and a connecting end, the operating end extends out of the far end to be operated by a user to drive the scalpel handle to slide between an extending position and a withdrawing position along the axis of the scalpel barrel, and the blade is detachably arranged at the connecting end; the locking piece is arranged between the knife cylinder and the knife handle; when the tool holder is positioned at the retraction position, the blade is accommodated in the near end; when the knife handle slides from the withdrawing position to the extending position, the blade extends out from the near end, and the knife handle and the knife cylinder are relatively locked and fixed by the locking piece. According to the laparoscopic surgical knife provided by the invention, the blade of the scalpel can extend out of the knife cylinder or be recovered and hidden in the knife cylinder, the use is safe and convenient, the problems of accidental scratching, 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 sterilized.

Description

Laparoscope surgical knife

Technical Field

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

Background

The laparoscopic surgery is a newly developed minimally invasive surgery method and is a necessary trend for the development of future surgery methods. With the rapid advance of industrial manufacturing technology, the fusion of related disciplines lays a firm foundation for the development of new technology and new method, and the more and more skillful operation of doctors makes many of the past open operations replaced by the intracavitary operations, thereby greatly increasing the operation selection opportunities.

In laparoscopic surgery, the fine cutting of bile duct, blood vessel, ureter and the like is usually needed to be cut by using a surgical knife, the structure of the surgical knife comprises a handle and a blade arranged on the handle, the blade is exposed in the external environment before and after the use of the surgical knife, the problems of accidental scratching, cross infection and the like are easily caused, the blade cannot be replaced, and the problems of blade dullness, difficult cutting, easy damage and the like are caused.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a laparoscopic surgical knife.

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

a knife cartridge having a proximal end and a distal end;

the scalpel comprises a scalpel handle and a blade, the scalpel handle is arranged in the scalpel barrel in a penetrating mode and is provided with an operating end and a connecting end, the operating end extends out of the far end to enable a user to operate the scalpel handle to drive the scalpel handle to slide between the extending position and the withdrawing position along the axis of the scalpel barrel, and the blade is detachably arranged at the connecting end;

the locking piece is arranged between the knife cylinder and the knife handle;

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

when the knife handle slides from the retraction position to the extension position, the blade extends from the near end, and the locking piece locks and fixes the knife handle and the knife cylinder relatively, so that the blade is kept outside the near 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 blade extends from the near 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 blade is kept outside the near end of the knife cylinder, namely, the blade of the surgical knife can extend out of the knife cylinder or be recovered and hidden in the knife cylinder. Further, the blade is disposable and can be removed and replaced, for example, different types and/or sizes of blades, such as 10, 11, 12, 15, 17, etc., 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 further 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 can expand along the radial direction of the cutter cylinder, the inner wall of the annular expansion part is provided with a stop buckle, the outer peripheral wall of the cutter handle is provided with an annular stop shoulder, and the annular stop shoulder is adjacent to the operating end;

when the knife handle slides from the retraction position to the extension position, the annular retaining shoulder moves towards the far end inwards and forces the annular expansion part to expand and then enter the annular expansion part and be buckled with the retaining buckle so as to prevent the knife handle from sliding towards the retraction position.

According to one embodiment of the invention, the annular expansion part is provided with an external thread, the wall of the annular expansion part is provided with at least two notches which are arranged at intervals in the circumferential direction of the annular expansion part, and each notch extends along the axial direction of the cutter cylinder;

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 located at the locking position, the nut coincides with the notch to limit expansion of the annular expansion part, and when the nut is located at the disassembling position, the nut is dislocated with the notch to allow expansion of the annular expansion part.

According to an embodiment of the invention, the tool holder further comprises a first elastic member provided between the tool holder and the tool cylinder to provide a first elastic force urging the tool holder to slide to the retracted position.

According to one embodiment of the invention, a step part is arranged on the inner wall of the knife cylinder, the first elastic part is a first spring, the first spring is sleeved on the knife handle, one end of the first spring abuts against the step part, and the other end of the first spring abuts against the annular blocking shoulder.

According to an embodiment of the present invention, the connecting end includes a rod portion, the rod portion is cut by an axial plane to form a missing portion and a remaining portion opposite to the missing portion, the remaining portion has a loading surface parallel to an axis of the rod portion, the loading surface is provided with a non-circular positioning protrusion, and the blade is provided with a positioning hole engaged with the positioning protrusion.

According to one embodiment of the invention, the scalpel further comprises a quick-release part, wherein the quick-release part is arranged on the rod part and slides between a combination position and a disassembly position along the axial direction of the rod part;

when the quick-release member is located at the assembling position, the quick-release member is located in the missing part, so that the blade is clamped between the retaining part and the quick-release member, and when the quick-release member is located at the disassembling position, the quick-release member and the retaining part are staggered, so that the positioning hole is separated from the positioning protrusion to disassemble the blade.

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

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

the side pressing part is provided with a side blocking surface, when the quick-release 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-release part is positioned at the disassembly position, the side pressing part and the retaining part are staggered.

According to one embodiment of the invention, an avoiding groove is arranged on the side blocking surface, one end of the avoiding groove close to the blade is opened to form an opening, and one end of the avoiding groove 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 avoiding groove, and when the quick-release part slides from the disassembly position to the combination position, the limiting surface is abutted to one end, far away from the blade, of the positioning bulge.

According to an embodiment of the present 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 for forcing 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 used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

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

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 of an embodiment of the present invention with the handle in a retracted position;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B;

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

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

FIG. 7 is an enlarged view of a portion of FIG. 5 at D;

FIG. 8 is a schematic structural view of a scalpel in the laparoscopic surgical knife according to the embodiment of the present invention;

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

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

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

Reference numerals:

a knife cylinder 10;

a distal end D10;

a proximal end D11;

an annular expansion portion 101;

a notch H101;

an expansion sheet 1011;

a stop buckle 1012;

a step portion 102;

a scalpel 20;

a connection end D20;

an operation end D21;

a knife handle 201;

an annular shoulder 2011;

a blade 202;

a positioning hole 2021;

a quick disconnect 203;

the sleeve portion 2031;

a side pressing portion 2032;

an avoidance slot H203;

a second elastic member 204;

a stem portion 205;

a deletion portion 2051;

a retention portion 2052;

a positioning boss 2053;

a lock member 30;

the first elastic member 40.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "circumferential," "radial," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

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

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Hereinafter, a laparoscopic surgical knife according to an embodiment of the present invention will be described in detail 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 scalpel 20, and a locking member.

Specifically, the knife cartridge 10 has a proximal end D11 and a distal end D10, where the proximal end D11 refers to the end that is closer to the patient during surgery and the distal end D10 refers to the end that is further from the patient during surgery.

The scalpel 20 comprises a scalpel handle 201 and a blade 202, 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 far end D10 so that a user can operate the scalpel handle 201 to slide between the extending position and the retracting position along the axis of the scalpel barrel 10, and the blade 202 is detachably arranged at the connecting end D20. That is, a user may push or pull handle 201 via handle end D21 such that handle 201 and blade 202 on handle 201 slide between an extended position and a retracted position. The blades 202 are detachably arranged at the connecting ends, so that the blades 202 can be conveniently mounted or dismounted, and different types of blades can be replaced according to the requirements of the operation.

The locking member 30 is disposed between the knife cylinder 10 and the knife handle 201, and the locking member 30 is used for locking and fixing the knife cylinder 10 and the knife 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 slides from the retracted position to the extended position, the blade 202 extends from the proximal end D11, and the lock member 30 locks the handle 201 and the knife cylinder 10 together, so that the blade 202 is kept outside the proximal end D11.

That is, with the handle 201 in the retracted position, the blade 202 is located inside the proximal end D11 of the cartridge 10, and prior to use, the blade 202 may be retained inside the cartridge 10, thereby preventing accidental scratching, and after use, the blade 202 may be retracted to the retracted position, thereby preventing accidental sticks and cross-contamination. When surgery is desired, the user can manipulate the handle 201 to slide the handle 201 from the retracted position to the extended position, in which the blade 202 is outside the proximal end D11 of the knife cylinder 10, so that the blade 202 can be used to perform surgery.

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 extended position and the retracted position along the axis of the knife cylinder 10, when the knife handle 201 slides from the retracted position to the extended position, the blade 202 extends from 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 blade 202 is kept outside the proximal end D11 of the knife cylinder 10, that is, the blade 202 of the surgical knife 20 can extend out of the knife cylinder 10 or be recovered and hidden in the knife cylinder 10, therefore, the blade 202 can be retracted and hidden in the knife cylinder 10 before or after use, and the problems of accidental scratches, cross infection and the like can be prevented, in addition, when the laparoscopic surgical knife is used, the blade can be pushed out to the extended position, and at the locking piece 30 directly locks the blade in the extended position, and the use operation is simple and convenient. The blade is disposable and can be disassembled for replacement, for example, different types and/or sizes of blades, such as 10, 11, 12, 15, 17, etc., can be replaced, and other parts can be reused after being sterilized.

Referring to fig. 1 to 6, in an embodiment of the present invention, the distal end D10 has an annular expansion part 101 extending along the axis of the knife cylinder 10, the annular expansion part 101 is expandable along the radial direction of the knife cylinder 10, the inner wall of the annular expansion part 101 is provided with a stop buckle 1012, the outer peripheral wall of the knife handle 201 is provided with an annular stop shoulder 2011, and the annular stop 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 towards the inside of the distal end D10 and forces the annular expansion part 101 to expand, and then enters the annular expansion part 101 and is buckled with the stop buckle 1012 to prevent the handle 201 from sliding towards the retracted position.

That is to say, the outer diameter of the annular shoulder 2011 on the handle 201 is greater than the distance from the stop buckle 1012 to the axis of the annular expansion portion 101, when the user slides the handle 201 from the retracted position to the extended position, the annular shoulder 2011 moves into the annular expansion portion 101, when the annular shoulder 2011 contacts with the stop buckle 1012, the handle 201 is continuously pushed, the annular shoulder 2011 is pressed by the stop buckle 1012, so that the annular expansion portion 101 expands radially outward, finally, the annular shoulder 2011 slides over the stop buckle 1012 and enters the annular expansion portion 101, and the annular shoulder 2011 stops on the side of the stop buckle 1012 away from the distal end D10, at this time, the annular shoulder 2011 and the stop buckle 1012 form a locked state, and by using the stop action between the annular shoulder 2011 and the handle of the stop buckle, the resistance of the stop buckle 1012 needs to be overcome when the handle 201 moves to the retracted position.

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

In this embodiment, the stopper button 1012 and the annular shoulder 2011 can be automatically fastened to form a blocking function when the tool holder 201 slides to the extended position by using the expansion function of the annular expansion part 101, so that the tool holder is very convenient to use.

Advantageously, the annular expansion part 101 has an external thread, the wall of the annular expansion part 101 has at least two cut-outs H101, the two cut-outs H101 are arranged at intervals in the circumferential direction of the annular expansion part 101, and each cut-out H101 extends in the axial direction of the knife cylinder 10.

The locking member 30 is a nut that mates with the external thread of the annular expansion 101 and the length of the external thread is greater than the thickness of the nut so that the nut moves between a locked position and a disassembled position. When the nut is in the locking position, the nut coincides with the cut H101 to restrict the annular expansion portion 101 from expanding, and when the nut is in the disassembly position, the nut is misaligned with the cut H101 to allow the annular expansion portion 101 to expand.

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 forms a plurality of expansion pieces 1011, and these expansion pieces 1011 can be expanded and deformed radially outward. When the nut moves to the locking position, the nut is overlapped with the notch H101, the nut is bound on the periphery of the expansion sheet 1011, so that the expansion sheet 1011 cannot expand outwards in the radial direction, and when the nut moves to the disassembling position, the nut is dislocated with the notch H101, the limitation on the expansion sheet 1011 is removed, so that the expansion sheet 1011 can expand outwards in the radial direction when a force outwards in the radial direction is applied to the expansion sheet 1011.

In a specific application, in an initial state, the nut is switched to a disassembly position, at this time, the annular expansion part 101 can be expanded, when an operation is required, a user operates the tool holder 201 to slide towards an extension position, in this process, the annular blocking shoulder 2011 acts with the stopping buckle 1012 to enable the expansion piece 1011 to expand outwards under the action of the radial direction, the annular blocking shoulder 2011 can enter the annular expansion part 101 after the expansion piece 1011 expands and stops at one side of the stopping buckle 1012 far away from the far end D10, then the nut is switched to a locking position, at this time, the nut coincides with the notch H101, the nut is bound on the periphery of the expansion piece 1011, the tool holder of the expansion piece 1011 cannot expand outwards in the radial direction, and therefore it is ensured that the tool holder 201 is kept at the extension position, and the blade 202 is kept outside the near end D11. After the operation, the nut can be switched to the disassembling position, at this time, the annular expansion part 101 can be expanded, the user operates the handle 201 to slide to the retracting position, in this process, the annular blocking shoulder 2011 also acts with the stopping buckle 1012, so that the expansion sheet 1011 is expanded outward under the action of radial outward, the annular blocking shoulder 2011 can be withdrawn from the annular expansion part 101 to the outside of the far end D10 after the expansion sheet 1011 is expanded, and the blade 202 can be retracted and hidden inside the near end D11.

In the embodiment, the annular expansion part 101 structure with the structure is adopted, and the locking piece 30 is configured as the nut, so that the nut is switched between the locking position and the disassembling position to limit the expansion of the annular expansion part 101 or release the limitation on the annular expansion part 101, thereby realizing the locking and fixing of the knife handle 201 and the knife cylinder 10, being convenient to operate, particularly ensuring that the scalpel 20 can be reliably kept at the extending position and preventing the accidental retraction.

Referring to fig. 1 to 6, in some embodiments of the present invention, a first elastic member 40 is further included, and the first elastic member 40 is disposed between the tool handle 201 and the tool cylinder 10 to provide a first elastic force for forcing the tool handle 201 to slide toward the retracted position.

That is to say, when no other external force is introduced, the first elastic force provided by the first elastic member 40 can force the handle 201 to move to the retracting position, and in this process, it can be ensured that the handle 201 can overcome the resistance of the stopper 1012 and return to the retracting position, so that after an operation or when the blade 202 needs to be hidden, the nut only needs to be switched to the disassembling position, and at this time, the first elastic force provided by the first elastic member 40 can automatically push the handle 201 to return to the retracting position, so that the blade 202 is retracted and hidden in the proximal end D11, thereby the use of the surgical knife is more convenient.

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

That is to say, the first spring abuts against between the step portion 102 and the annular shoulder 2011 in the knife cylinder 10, so that the first spring is convenient to mount, and the first elastic acting force provided by the first spring can ensure that the knife handle 201 smoothly and reliably returns to the retraction position.

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

That is, the cut-off portion of the rod portion 205 is a missing portion 2051, and the remaining portion after the cutting-off is a remaining portion 2052, the remaining portion 2052 is cut off by the axial plane to form a loading surface, and the loading surface is provided with a positioning protrusion 2053, so that when the blade 202 is mounted, the positioning hole 2021 of the blade 202 can be sleeved on the positioning protrusion 2053, and the blade 202 is ensured to be tightly attached to the loading surface, so that the blade 202 can be relatively fixed in the axial direction of the rod portion 205, and further, since the positioning protrusion 2053 is non-circular, such as a waist shape, a rectangular shape, and the like, and correspondingly, the positioning hole 2021 and the positioning protrusion 2053 are adapted in shape, when the positioning hole 2021 of the blade 202 is matched with the positioning protrusion 2053 on the loading surface, the blade 202 cannot rotate in the circumferential direction, and the blade 202 is ensured to be reliably.

In this embodiment, the positioning protrusion 2053 and the positioning hole 2021 are used to facilitate the installation, removal, and replacement of the blade 202.

Referring to fig. 7-11, in one embodiment of the present invention, the scalpel 20 further comprises a quick release member 203, wherein the quick release member 203 is disposed on the shaft portion 205 and slides along the axial direction of the shaft portion 205 between an assembled position and an disassembled position.

When the quick release member 203 is located at the assembling position, the quick release member 203 is located in the missing part 2051, so that the blade 202 is clamped between the retaining part 2052 and the quick release member 203, and when the quick release member 203 is located at the disassembling position, the quick release member 203 and the retaining part 2052 are misaligned, so that the positioning hole 2021 and the positioning protrusion 2053 are allowed to be disengaged to disassemble the blade 202.

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

In this embodiment, the quick-release member 203 is switched between the assembling position and the disassembling position to quickly press and fix the blade 202 and quickly disassemble the blade 202, and the use is simple and convenient.

In addition, it should be noted that, in the related art, the blade 202 and the handle 201 are clamped by the bayonet and the protrusion to realize the installation and the detachment of the blade 202, but this installation method is poor in the reliability of the fixation of the blade 202, and there is a risk of falling off from the handle 201, and if the blade falls off in a human body during an operation, a safety accident may be caused.

Referring to fig. 9 to 11, in an embodiment of the invention, the quick release member 203 includes a sleeve portion 2031 and a side pressing portion 2032, wherein the sleeve portion 2031 is slidably sleeved on the rod portion 205.

The side pressure portion 2032 and one end of the sleeve portion 2031 close to the blade 202 are provided, and the side pressure portion 2032 has a side stopper surface facing the loading surface so that the blade 202 is interposed between the side stopper surface and the loading surface when the quick release 203 is at the combination position and the side pressure portion 2032 is displaced from the retention portion 2052 when the quick release 203 is at the disassembly position.

That is, the sleeve 2031 can slide along the rod 205 between the assembling position and the disassembling position, the side pressure portion 2032 is connected to one end of the sleeve 2031 near the blade 202 and can slide synchronously with the sleeve 2031, when the sleeve 2031 slides, the side pressure portion 2032 can be switched to be opposite to or dislocated from the retaining portion 2052, when the side pressure portion 2032 is opposite to the retaining portion 2052, the blade 202 can be clamped between the side pressure portion 2032 and the retaining portion 2052, and when the side pressure portion 2032 is dislocated from the retaining portion 2052, the positioning protrusion 2053 can be exposed, so that the blade 202 can be disassembled and replaced.

In this embodiment, the sleeve portion 2031 is slidably coupled to the lever portion 205, so that the quick release member 203 can be smoothly and reliably slid on the lever portion 205, and the combination position and the release position can be smoothly switched. The side pressing portion 2032 presses the blade 202 to ensure the blade 202 is fixed reliably.

Referring to fig. 9 to 10, in an embodiment of the present invention, an avoidance groove H203 is provided on the side blocking surface, an end of the avoidance groove H203 close to the blade 202 is open to form an opening, and an end of the avoidance groove H203 far from the blade 202 is closed to form a defined 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 avoiding groove H203, and when the quick-release member 203 slides from the disassembly position to the assembly position, the limiting surface abuts against one end of the positioning protrusion 2053, which is far away from the blade 202.

When quick detach piece 203 is in the composite position, protruding 2053 in location is located dodges groove H203, and the one end of keeping away from blade 202 on spacing face and the protruding 2053 in location offsets, so, can utilize the limiting displacement of spacing face, ensure that quick detach piece 203 just slides to the composite position, and when quick detach piece 203 slides from the composite position to the position of disassembling, protruding 2053 in location is from dodging the opening roll-off of groove H203, ensure that protruding 2053 in location can show out completely, make things convenient for blade 202 to dismantle and change.

It will be appreciated that the side pressure portion 2032 and the sleeve portion 2031 may be detachably connected, such as by screws, and after the sleeve portion 2031 is sleeved on the rod portion 205, the side pressure portion 2032 is installed in the notch portion, and finally the side pressure portion 2032 and the sleeve portion 2031 are fixed by screws.

Referring to fig. 7 to 11, in an embodiment of the present invention, the scalpel 20 further includes a second elastic member 204, and the second elastic member 204 is disposed between the quick release member 203 and the connecting end D20 to provide a second elastic force for forcing the quick release member 203 to slide toward the combining position.

When the quick-release piece 203 slides from the combining position to the disassembling position, the second elastic piece 204 is compressed, the positioning protrusion 2053 is exposed, at the moment, the positioning groove of the blade 202 is matched with the positioning protrusion 2053, when the quick-release piece 203 is loosened, the second elastic piece 204 recovers deformation to force the quick-release piece 203 to return to the combining position quickly, so that the quick installation of the blade 202 can be realized, and the quick-release piece 203 can be ensured to be kept at the combining position under the second elastic action of the second elastic piece 204, and the reliable installation of the blade 202 is ensured.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A laparoscopic surgical knife, comprising:

a knife cartridge having a proximal end and a distal end;

the scalpel comprises a scalpel handle and a blade, the scalpel handle is arranged in the scalpel barrel in a penetrating mode and is provided with an operating end and a connecting end, the operating end extends out of the far end to enable a user to operate the scalpel handle to drive the scalpel handle to slide between the extending position and the withdrawing position along the axis of the scalpel barrel, and the blade is detachably arranged at the connecting end;

the locking piece is arranged between the knife cylinder and the knife handle;

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

when the knife handle slides from the retraction position to the extension position, the blade extends from the near end, and the locking piece locks and fixes the knife handle and the knife cylinder relatively, so that the blade is kept outside the near end.

2. The laparoscopic surgical knife of claim 1, wherein said distal end has an annular expansion portion extending along the axis of said knife cylinder, said annular expansion portion being expandable in the radial direction of said knife cylinder, the inner wall of said annular expansion portion being provided with a stop catch, the outer peripheral wall of said knife handle being provided with an annular stop shoulder adjacent to said operating end;

when the knife handle slides from the retraction position to the extension position, the annular retaining shoulder moves towards the far end inwards and forces the annular expansion part to expand and then enter the annular expansion part and be buckled with the retaining buckle so as to prevent the knife handle from sliding towards the retraction position.

3. The laparoscopic surgical tool according to claim 2, wherein said annular expanding portion has an external thread, a wall of said annular expanding portion has at least two cutouts arranged at intervals in a circumferential direction of said annular expanding portion, each of said cutouts extending in an axial direction of said cylinder;

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 located at the locking position, the nut coincides with the notch to limit expansion of the annular expansion part, and when the nut is located at the disassembling position, the nut is dislocated with the notch to allow expansion of the annular expansion part.

4. The laparoscopic surgical knife of claim 2, further comprising a first resilient member disposed between said handle and said blade cartridge to provide a first resilient force urging said handle to slide toward said retracted position.

5. The laparoscopic surgical knife according to claim 4, wherein the inner wall of the knife cylinder is provided with a step portion, the first elastic member is a first spring, the first spring is sleeved on the knife handle, one end of the first spring abuts against the step portion, and the other end of the first spring abuts against the annular blocking shoulder.

6. The laparoscopic surgical knife of claim 1, wherein said connecting end includes a shaft portion, said shaft portion being cut by an axial plane to form a missing portion and a remaining portion opposite to said missing portion, said remaining portion having a loading surface parallel to the axis of said shaft portion, said loading surface being provided with a non-circular positioning protrusion, said blade being provided with a positioning hole to be fitted with said positioning protrusion.

7. The laparoscopic surgical knife of claim 6, wherein said scalpel further comprises a quick release member provided on said shaft and sliding between an assembled position and an disassembled position along an axial direction of said shaft;

when the quick-release member is located at the assembling position, the quick-release member is located in the missing part, so that the blade is clamped between the retaining part and the quick-release member, and when the quick-release member is located at the disassembling position, the quick-release member and the retaining part are staggered, so that the positioning hole is separated from the positioning protrusion to disassemble the blade.

8. The laparoscopic surgical knife of claim 6, wherein said quick disconnect comprises:

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

the side pressing part is provided with a side blocking surface, when the quick-release 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-release part is positioned at the disassembly position, the side pressing part and the retaining part are staggered.

9. The laparoscopic surgical knife of claim 8, wherein said side blocking surface is provided with an avoiding groove, one end of said avoiding groove near said blade is open to form an opening, and one end of said avoiding groove far from said 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 avoiding groove, and when the quick-release part slides from the disassembly position to the combination position, the limiting surface is abutted to one end, far away from the blade, of the positioning bulge.

10. The laparoscopic surgical knife of claim 7, wherein said scalpel further comprises a second resilient member disposed between said quick disconnect and said connecting end for providing a second resilient force urging said quick disconnect to slide toward said assembled position.

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