阅读说明：本技术 一种电外科剪刀 (Electrosurgical scissors ) 是由 叶宗鉴 于 2020-06-08 设计创作，主要内容包括：本发明涉及一种电外科剪刀包含第一刀片和第二刀片,其中所述第一刀片包含第一近端驱动部分和第一远端刀片体及连接其的第一安装部分；所述第二刀片包含第二近端驱动部分和第二远端刀片体及连接其的第二安装部分,所述第一刀片体包含第一刀尖、第一配合面、第一磨刀面和第一外侧面,所述第一磨刀面与第一配合面相交形成第一磨削刃,所述第一磨刀面和第一外侧面相交形成第一过渡刃。在所述第一配合面之上且处于第一磨削刃的临近区域,设置防滑槽,所述防滑槽由第一配合面朝向所述第一刀片体内部凹陷。(The present invention relates to an electrosurgical shears comprising a first blade and a second blade, wherein the first blade comprises a first proximal driving portion and a first distal blade body and a first mounting portion connected thereto; the second blade contains second near-end drive segment and second distal end blade body and connects its second installation portion, first blade body contains first knife tip, first fitting surface, first mill face and first lateral surface, first mill face intersects with first fitting surface and forms first mill sword, first mill face intersects with first lateral surface and forms first transition sword. And an anti-slip groove is arranged above the first matching surface and in the vicinity of the first grinding edge, and the anti-slip groove is recessed towards the interior of the first blade body from the first matching surface.)

1. Electrosurgical scissors comprising a first blade and a second blade, wherein the first blade comprises a first proximal drive portion and a first distal blade body and a first mounting portion connected thereto; the second blade comprises a second proximal drive portion and a second distal blade body and a second mounting portion connected thereto, characterized in that:

1) the first blade body comprises a first blade tip, a first matching surface, a first blade grinding surface and a first outer side surface;

2) the first grinding tool face intersects with the first matching face to form a first grinding edge, and the first grinding tool face intersects with the first outer side face to form a first transition edge;

3) and an anti-slip groove is arranged above the first matching surface and in the vicinity of the first grinding edge, and the anti-slip groove is recessed towards the interior of the first blade body from the first matching surface.

2. Electrosurgical scissors according to claim 1, wherein two adjacent anti-slip channels define an anti-slip rib, and a plurality of the anti-slip channels and ribs define the anti-slip region.

3. Electrosurgical scissors according to claim 2, wherein the first blade is integrally formed using a metal powder injection process.

4. Electrosurgical scissors according to claim 2, wherein the second blade is identical to the first blade.

5. Electrosurgical scissors according to claim 2, wherein the first blade and the second blade are in the shape of matching arcs and the second blade also comprises a plurality of anti-slip grooves and anti-slip zones comprising anti-slip ribs.

6. An electrosurgical shears according to claim 2 wherein the shears are well matched and the non-slip region is not exposed when the shears are closed.

7. The method of manufacturing scissors according to claim 2, comprising the steps of:

s1: powder injection

S2: grinding the first grinding surface without damaging the anti-slip groove

S3: assembling, packaging and sterilizing.

Technical Field

The invention relates to a minimally invasive surgical instrument, in particular to an electrosurgical scissors.

Background

Surgical instruments have been used for hundreds of years, and doctors in surgery use different surgical instruments to complete the operations of tissue grasping, shearing, separating, blood coagulation, suture closing and the like, and the surgical instruments have matured after hundreds of years of development. Endoscopic surgery has been clinically developed for over 30 years and is progressing rapidly. In brief, endoscopic surgery (including laparoscopic surgery and fiberscope surgery), i.e., surgeons, uses elongated endoscopic hand-held instruments to enter a patient through a natural orifice or a constructed puncture channel to complete tissue grasping, cutting, separating, coagulating, suturing, closing and other operations.

Laparoscopic surgery has the major advantages over traditional open surgery in terms of reduced trauma and pain and accelerated recovery. In endoscopic surgery, a doctor usually can only touch internal organs of a patient by means of instruments and cannot directly sense the internal organs by hands. In addition, the visual field of the endoscopic surgery doctor is severely limited, and the local area of the working head of the instrument can be observed only by means of an endoscope and an image system. Because the field of vision of a doctor in the endoscopic surgery is limited and the doctor lacks of tactile feedback, the endoscope hand-held instrument (endoscopic scissors, endoscopic graspers, endoscopic separating forceps and the like) has high requirements on the aspects of accuracy, consistency, controllability and the like. So far, various performances of the endoscope hand-held instrument have various problems, and the requirements of continuously improving the skill of the endoscope operation and continuously developing new kinds of endoscope operations cannot be met.

Disclosure of Invention

Accordingly, to address the problems of the prior art, in one aspect of the present invention, a surgical instrument is provided, an electrosurgical shears comprising a first blade and a second blade, wherein the first blade comprises a first proximal drive portion and a first distal blade body and a first mounting portion connected thereto; the second blade contains second near-end drive segment and second distal end blade body and connects its second installation portion, first blade body contains first knife tip, first fitting surface, first mill face and first lateral surface, first mill face intersects with first fitting surface and forms first mill sword, first mill face intersects with first lateral surface and forms first transition sword. And an anti-slip groove is arranged above the first matching surface and in the vicinity of the first grinding edge, and the anti-slip groove is recessed towards the interior of the first blade body from the first matching surface.

According to the preferable scheme, one anti-slip rib is limited by two adjacent anti-slip grooves, and the anti-slip grooves and the anti-slip ribs form an anti-slip area.

In a preferred embodiment, the first blade is integrally formed by a metal powder injection process.

In a preferred embodiment, the second blade is identical to the first blade.

In a preferred embodiment, the first blade and the second blade are in the shape of arcs matched with each other, and the second blade also comprises a plurality of anti-slip grooves and an anti-slip area formed by anti-slip ribs.

In a preferred embodiment, the scissors are well-matched and the non-slip region is not exposed when the scissors are closed.

A preferred embodiment comprises the following steps:

s1: powder injection

S2: grinding the first grinding surface without damaging the anti-slip groove

S3: assembling, packaging and sterilizing.

Drawings

For a fuller understanding of the nature of the present invention, reference should be made to the following detailed description taken together with the accompanying figures in which:

FIG. 1 is a typical endoscopic hand piece 10;

FIG. 2 is an exploded view of the head assembly 40 shown in FIG. 1;

FIG. 3 is a side schematic view of the head assembly 40 shown in FIG. 1;

FIG. 4 is a schematic perspective view of the head assembly 40 of FIG. 1;

FIG. 5 is a schematic blade view of the head assembly shown in FIG. 4;

FIG. 6 is a schematic view of the modified first blade 100;

fig. 7 is a schematic view of a modified second blade 200;

FIG. 8 is a schematic view of the improved head assembly 40;

fig. 9 is a schematic view of a further modified first blade 100 a;

FIG. 10 is a cross-sectional view of 10-10 of FIG. 9;

FIG. 11 is a perspective view of the first blade 100a shown in FIG. 10;

FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. 11

Fig. 13 is a perspective view of the second blade 200 a;

FIG. 14 is a perspective view of the head assembly 40 a;

FIG. 15 is a perspective view of the head assembly 40a in a closed position;

FIG. 16 is a schematic perspective view of yet another modified first blade 100 b;

FIG. 17 is a side projection view of the first blade 100 b;

FIG. 18 is a cross-sectional view taken at 18-18 of FIG. 17;

FIG. 19 is a cross-sectional view of 19-19 of FIG. 17;

FIG. 20 is a cross-sectional view 20-20 of FIG. 17;

fig. 21 is a perspective view of the second blade 200 b;

fig. 22 is a side projection view of the second blade 200 b;

FIG. 23 is a cross-sectional view of 23-23 of FIG. 22;

FIG. 24 is a cross-sectional view taken 24-24 of FIG. 22;

FIG. 25 is a cross-sectional view taken generally from 25-25 of FIG. 22;

FIG. 26 is a partial cutaway view of the scissors assembly;

fig. 27-28 are perspective views of the head of the scissors.

Like reference numerals refer to like parts or components throughout the several views.

Detailed Description

Embodiments of the present invention are disclosed herein, however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, the disclosure herein is not to be interpreted as limiting, but merely as a basis for the claims and as a basis for teaching one skilled in the art how to employ the present invention.

Referring to fig. 1, for convenience, the side next to the operator is defined as the proximal side, and the side further away from the operator is defined as the distal side.

In performing laparoscopic surgery, a piercing cannula assembly (not shown) is typically used to establish surgical access to and from a patient's body wall through which various minimally invasive surgical instruments, such as hand-held instrument 10, may be inserted into a body cavity. One or more cannula assemblies may be used simultaneously during a surgical procedure, and surgical handpiece 10 may be configured to operate simultaneously with one or more other cannula assemblies depending on the surgical needs.

FIG. 1 depicts a typical endoscopic hand piece 10 comprising a proximal handle 20, a distal head assembly 40, and an elongated shaft 30 extending therebetween. The handle 20 includes a front grip 21, a rear grip 22 and a handle rotation shaft 23 connected thereto, and the front grip 21 and the rear grip 22 are rotatably movable with respect to the handle rotation shaft 23. The elongated rod portion 30 includes an axis 31, a runner 35, an outer rod 50 and an inner rod 60. Wherein outer rod 50 and wheel 35 are fixed as one and mounted together in handle 20, said handle 20 limiting translational displacement of wheel 35 in the direction of axis 31, but allowing wheel 35 to rotate about axis 31. In an alternative arrangement, the handle 20 further comprises an electrical plug 24, the electrical plug 24 having one end mounted in the handle 20 and connected to the elongated shaft 30 and the other end exposed outside the handle 20. The electrical plug 24 may be in mating communication with a standard lead wire to a high frequency electrocoagulation device. The head assembly 40 includes a head pin 45, a holder 70, a driving mechanism 80, a first blade 100 and a second blade 200.

Fig. 2-4 illustrate the structure, composition and functional relationship of the head assembly 40 in more detail. The first blade 100 includes a first blade body 140, a first connecting portion 120 and a first fixing portion 130 connected thereto, and further includes a first fixing hole 135 penetrating the first fixing portion 130 and a first connecting shaft 110 extending outward from the first connecting portion 120. The second blade 200 includes a second blade body 240, a second connecting portion 220, a second fixing portion 230 connected to the second connecting portion 220, a second fixing hole 235 penetrating the second fixing portion 230, and a second connecting shaft 210 extending outward from the second connecting portion 220. The driving mechanism 80 includes a slider body 81, and a first slide groove 83 and a second slide groove 85 which are recessed downward from both side surfaces thereof and intersect with each other, and further includes a connecting groove 89. The fixing base 70 includes a first suspension arm 71 and a first pin hole 73 penetrating therethrough, a second suspension arm 75 and a second pin hole 77 penetrating therethrough, and the first suspension arm 71 and the second suspension arm 75 define a U-shaped groove 79.

With continued reference to fig. 3-4, wherein the first blade 100 and the second blade 200 are stacked on each other and mounted between the first suspension arm 71 and the second suspension arm 75 in the holder 70, the head pin 45 sequentially penetrates through the first pin hole 73, the first fixing hole 135, the second fixing hole 135 and the second pin hole 77, thereby connecting the first blade 100, the second blade 200 and the holder 70, wherein both ends of the head pin 45 are riveted with the first suspension arm 71 and the second suspension arm 75, and the first blade 100 and the second blade 200 are rotatable around the head pin 45. The driving slider 80 is installed between the first suspension arm 71 and the second suspension arm 75, and the driving slider 80 is simultaneously located between the first connecting portion 120 and the second connecting portion 220, the first connecting shaft 110 is matched with the first sliding groove 83, and the second connecting shaft 210 is matched with the second sliding groove 85. The first tie rod head 31 of the inside rod 32 is matched with the connecting groove 89, and the second tie rod head 39 (not shown) is connected with the handle 20. The front handle 21 and the rear handle 22 are opened or closed in a rotating manner around the peripheral rotating shaft 23, and the driving slider 80 is driven to move in the U-shaped groove 79 along the axial direction 31 by the transmission force of the inner rod 32, so that the first sliding groove 83 drives the first connecting shaft 110 (and the second sliding groove 85 drives the second connecting shaft 210) to slide therein, and the first blade 100 and the second blade 200 are driven to open or close in a rotating manner around the head pin shaft 45. The mechanical principle of such chute translation driving the rotation of the workhead should be readily understood by those skilled in the art. The action principle of the driving mechanism of the present invention can be understood by combining the action mechanisms similar to the above-mentioned chute driving disclosed in detail in the patent documents of US patent 5496347, US patent 81144120, etc., and will not be described in detail herein.

It will be appreciated by those skilled in the art that laparoscopic surgical instruments generally fall into three broad categories, laparoscopic scissors, laparoscopic separation forceps and laparoscopic graspers, depending on the shape and function of the head. In one aspect of the present invention, a pair of endoscopic scissors 10 has a first blade 100 and a second blade 200, wherein the first blade 100 is the first blade 100 and the second blade 200 is the second blade 200. The first blade 100 includes a first blade body 140, a first connecting portion 120, a first fixing portion 130, a first fixing hole 135, and a first connecting shaft 110. The second blade 200 includes a second blade body 240, a second connecting portion 220, a second fixing portion 230, a second fixing hole 235 and a second connecting shaft 210.

Referring now to fig. 4-5, in one particular implementation the first blade body 140 and the second blade body 240 are curved and mate with each other. In more detail, the first blade body 140 comprises a first blade tip 151, a first grinding surface 152, a first mating surface 153 and a first outer side surface 154, wherein the first grinding surface 152 intersects the first mating surface 153 to form a first grinding edge 157, and the first grinding surface 152 intersects the first outer side surface 154 to form a first transition edge 158. The second blade body 240 comprises a second tip 251, a second edge face 252, a second mating face 253, and a second outer side face 254, wherein the second edge face 252 intersects the second mating face 253 to form a second grinding edge 257 and the second edge face 252 intersects the second outer side face 254 to form a first transition edge 258.

The first blade 100 and the second blade 200 are assembled together to form the head assembly 40, wherein the first mating surface 153 and the second mating surface 253 are matched with each other and do not contact or partially contact each other, the first grinding edge 157 and the second grinding edge 257 form a point contact, and the first grinding edge 157 and the second grinding edge 257 always maintain a point contact during the opening or closing of the first blade body 140 and the second blade body 240 by operating the handle 20. US patent nos. 5478347, US6168605, US8114107 disclose the arcuate design of the blade and the method of maintaining point contact, respectively, and those skilled in the art may refer directly or with minor adaptations to achieve the first and second grinding edges 157, 257 of the present invention to maintain point contact at all times.

Referring now to fig. 6-8, in yet another modified design, the first blade body 140 further includes a non-slip region 160 and the second blade body 240 further includes a non-slip region 260. As shown in fig. 6, in more detail, the root groove 161 extends through both the first rake face 152 and the first flank face 154; the root groove 161 is U-shaped in cross-section in a direction generally parallel to the transition edge 158; the root groove 161 is triangular in cross-section in a direction generally perpendicular to the transition edge 158. The two adjacent root troughs 161 define anti-slip teeth 165, and the plurality of anti-slip teeth 165 and the plurality of root troughs 161 comprise the anti-slip region 160 of the present invention. As shown in more detail in fig. 7, the root groove 261 extends through both said second edge face 252 and said second outer flank 254; in the direction approximately parallel to the transition edge 258, the section of the tooth root groove 261 is U-shaped; the root groove 261 is triangular in cross-section in a direction generally perpendicular to the transition edge 258. The two adjacent root troughs 261 define anti-slip teeth 265, and a plurality of anti-slip teeth 265 and a plurality of root troughs 261 comprise the anti-slip zone 260 of the present invention.

Referring now to FIG. 8, when the instrument 10 is used to cut or separate tissue within a patient's body, the anti-slip region 160 (and or the anti-slip region 260) generally makes direct contact with the tissue, increasing the frictional resistance between the tissue and the blade, preventing slippage during cutting/separating of the tissue, and achieving precise cutting/separation. The anti-skid function of the anti-skid area is very important because the vision of surgeons is limited and the tactile feedback is lacked in the endoscopic surgery, and most surgeons prefer endoscopic scissors with an anti-skid function. However, there is no single-use endoscopic scissors with respect to the anti-slip structure of the present invention in the technical documents disclosed so far. Disposable endoscopic scissors, which have been commercialized, mass-produced, sold and used, do not include the anti-slip structure of the present invention.

In one aspect of the invention, a sheet metal manufacturing method of disposable cavity mirror scissors is provided, which comprises the following steps:

s1: forming a metal plate, namely manufacturing a first (second) blade by using a stainless steel plate with proper thickness and a metal plate stamping die;

s2: a grinding edge grinding the first (second) insert to form a first (first) grinding surface and a first (second) grinding edge;

s3: processing the anti-skid area, and manufacturing a first (second) tooth root groove by adopting a grinding or cutting mode;

s4: deburring, namely performing chamfer deburring treatment on all corners formed by processing the tooth root groove;

s5: the device 10 is assembled, then packaged and sterilized.

The anti-skid area is processed by adopting the sheet metal manufacturing method, so that the processing efficiency is lower, and the processing cost is higher; and the first (second) tooth root groove is processed to form more sharp edges, so that the deburring cost is higher, the production cost of the disposable endoscope scissors is greatly improved, and the disposable endoscope scissors are not suitable for mass production.

In another aspect of the invention, an improved method of making a disposable laparoscopic scissors is provided, comprising the steps of:

s1: molding: forming (subsequently abbreviated as MIM) a first (second) blade comprising a first (second) non-slip region using a metal powder injection molding process;

s2: grinding: grinding the first (second) insert to form a first (second) grinding face and a first (second) grinding edge;

s3: deburring, namely deburring the joint corner of the first (second) grinding tool face and the first (second) tooth root groove formed by grinding;

s4: the instrument 10 is assembled and the package sterilized.

Adopt the aforesaid MIM method to make disposable chamber mirror scissors who contains anti-skidding district, because powder injection moulding's first (second) blade has contained anti-skidding district (tooth root groove) in advance, can produce great vibrations (undulant) during the grinding cutting edge, seriously influence the sharpness of cutting edge, and produce a large amount of burrs between the limit of first (second) grinding face and first (second) tooth root groove handing-over, the cost of burring is higher, its overall production cost is still higher, is not suitable for mass production.

Fig. 9-14 depict yet another embodiment of the invention, a cavity mirror scissors 11. The scissors 11 are similar in structure and composition to the instrument 10 (note that the same parts of the scissors 11 as the instrument 10 are not shown in the subsequent figures, and the same reference numerals are used for the same parts or components in the subsequent description and the drawings of the description).

The scissors 11 comprise a handle 20, a distal head assembly 40a, and an elongated shaft 30. The head assembly 40a includes a head pin 45, a holder 70, a driving mechanism 80, a first blade 100a and a second blade 200 a. The first blade 100a includes a first blade body 140a, a first connecting portion 120, a first fixing portion 130, a first fixing hole 135 and a first connecting shaft 110. The second blade 200a includes a second blade body 240a, a second connecting portion 220, a second fixing portion 230, a second fixing hole 235 and a second connecting shaft 210.

Referring now to fig. 9-12, in one design, the first blade body 140a includes a first blade tip 151, a first tool face 152, a first mating face 153 and a first outer side face 154, wherein the first tool face 152 intersects the first mating face 153 to form a first grinding edge 157, and the first tool face 152 intersects the first outer side face 154 to form a first transition edge 158. The first blade body 140a also includes a non-slip region 160 a. As shown in fig. 11-12, in more detail, the anti-slip groove 161a is disposed above the first mating surface 153 in the vicinity of the first grinding edge 157, and the anti-slip groove 161a is recessed from the first mating surface 153 toward the interior of the first blade body 140 a. Two adjacent anti-slip grooves 161a define an anti-slip rib 165a, and a plurality of anti-slip grooves 161a and anti-slip ribs 165a form the anti-slip region 160a of the present invention.

Referring now to fig. 13, in an alternative design, the second blade body 240a includes a second tip 251, a second edge face 252, a second mating face 253, and a second outer side surface 254, wherein the second edge face 252 intersects the second mating face 253 to form a second grinding edge 257, and the second edge face 252 intersects the second outer side surface 254 to form a first transition edge 258. The first blade body 240a also includes a non-slip region 260 a. A slip-resistant groove 261a is provided above the second mating surface 253 in the vicinity of the second grinding edge 257, the slip-resistant groove 261a being recessed from the second mating surface 253 toward the interior of the second insert body 240 a. Two adjacent anti-slip grooves 261a define an anti-slip rib 265a, and a plurality of anti-slip grooves 261a and anti-slip ribs 265a form the anti-slip region 260a of the present invention.

Fig. 14 depicts a common mode of use of the scissors 11, i.e., the pair of blades of the scissors 11 are opened to a maximum angle for cutting thicker tissue, or called a re-cutting mode. In this re-shearing mode, when the pair of shear blades close and shear the crushed tissue, the shear blades and their cutting edges generate a large pushing force from the proximal end to the distal end to the tissue. Fig. 15 depicts another common mode of use of the scissors 11, namely, a pair of blades of the scissors 11 fully engaged for blunt dissection, or tissue electrocoagulation or high efficiency electrotomy, otherwise known as an electrotomy mode. Particularly for tissue electrocoagulation or high-efficiency electrosection, the scissors 11 are well matched and the anti-slip area is not exposed outside so as not to influence the electrocoagulation/electrosection effect. When a pair of scissors is combined for electric cutting, tissues are burnt and then attached to the outer surface of the blade, and if the outer surface is provided with anti-slip teeth, the tissues are extremely difficult to clean. The existing endoscopic scissors design is usually only suitable for a certain use mode, and generally cannot be compatible with different use modes or functional performance under different use modes is deficient, so that surgeons usually need to be equipped with various endoscopic scissors, and particularly when the disposable endoscopic scissors are used, great resource waste is caused and the surgery cost is increased.

With continued reference to FIG. 14, the head assembly 40a of the laparoscopic scissors 11 includes non-slip regions 160a and or non-slip regions 260a that function in a manner similar to the non-slip regions 160 and or non-slip regions 260 of the head assembly 40 of the laparoscopic scissors 10. The first blade 100a has a greater anti-slip effect than the anti-slip region 160a compared to the first blade 100, and the blade 100a is significantly better than the blade 100a if compared to the anti-slip effect alone. However, it will be appreciated by those skilled in the art that, in order to save surgical costs and time, endoscopic scissors are typically used not only to cut tissue or organs, but also for blunt dissection and electrocoagulation. As shown in fig. 15, after the first blade and the second blade of the normal endoscopic scissors are closed, the anti-skid region is not exposed, when the anti-skid region is used for blunt tissue separation, or tissue electrocoagulation is carried out by utilizing the first outer side surface of the first scissors. The function (performance) of the blade 100a is significantly better than the blade 100, based on either blunt separation or electrocoagulation effect comparison. In consideration of the shearing performance (such as sharpness and skid resistance) of the endoscopic scissors, the blunt separation performance (such as prevention of accidental injury of other organs or tissues by sharp edges) and the electro-coagulation performance, and how to improve the processing and manufacturing efficiency so as to reduce the cost, various factors are interwoven together, so that the seeking of a design balance point is difficult.

Figures 16-27 depict a further embodiment of laparoscopic shears 12 of the present invention. The scissors 12 are similar in structure and composition to the instrument 10 (note that the scissors 12 are identical to the instrument 10 and will not be shown in subsequent figures, and like reference numerals are used to identify identical parts or elements throughout the subsequent description and drawings).

The scissors 12 include a handle 20, a distal head assembly 40a, and an elongated shaft 30. The head assembly 40b includes a head pin 45, a holder 70, a driving mechanism 80, a first blade 100b and a second blade 200 b. The first blade 100b includes a first blade body 140b, a first connecting portion 120, a first fixing portion 130, a first fixing hole 135 and a first connecting shaft 110. The second blade 200b includes a second blade body 240b, a second connecting portion 220, a second fixing portion 230, a second fixing hole 235 and a second connecting shaft 210.

Referring now to fig. 16-17, in one design, the first blade body 140b comprises a first blade tip 151, a first mating surface 152, a first mating surface 153 and a first outer side surface 154, wherein the first mating surface 153 intersects the first mating surface 152 to form a first grinding edge 157, and the first mating surface 152 intersects the first outer side surface 154 to form a first transition edge 158. The first blade body 140b also includes a non-slip region 160 b. As shown in fig. 16, 17 and 20, in more detail, the anti-slip rib 161b is disposed above the first mating surface 153 and in the vicinity of the first grinding edge 157, the anti-slip rib 161b is protruded from the first mating surface 153 toward the outside of the first blade body 140a, and a plurality of the anti-slip ribs 161b constitute the anti-slip region 160b according to the present invention.

With continued reference to fig. 17-20, the first fixing portion 130 includes a fixing plane 131, and the first mating surface 153 is twisted at an angle relative to the fixing plane 131. More precisely, any section perpendicular to the fixing plane 131 intersects the first mating surface 153 at an acute angle BX with the fixing plane 131. I.e. the first mating surface 153 is at an acute twisting angle BX with respect to the fixing plane 131.

Referring now to fig. 21-25, in an alternative design, the second blade body 240b includes a second tip 251, a second tip surface 252, a second mating surface 253, and a second outer side surface 254, wherein the second tip surface 252 intersects the second mating surface 253 to form a second grinding edge 257, and the second tip surface 252 intersects the second outer side surface 254 to form a first transition edge 258. The first blade body 240b also includes a non-slip region 260 b. A non-slip bead 261b is disposed above the second mating surface 253 in the vicinity of the second grinding edge 257, and the non-slip bead 261b protrudes from the second mating surface 253 toward the outside of the first blade body 240 a. A plurality of said cleats 261b constitute said non-slip zone 260b of the present invention.

With continued reference to fig. 22-25, the first fixing portion 230 includes a fixing plane 231, and the second mating surface 253 is twisted at an angle relative to the fixing plane 231. More precisely, an arbitrary section perpendicular to the fixing plane 231 intersects the first mating surface 253, and the intersection line thereof forms an acute angle CX with the fixing plane 231. I.e. the second mating surface 253 is at an acute twisting angle CX with respect to the fixing plane 231.

Referring now to fig. 26-27, the values and orientations of BX and CX are set such that when how many of the first grinding edge 157 and the second grinding edge 257 match each other to form an arbitrary point contact PX, the acute twisting angle BX and the acute twisting angle CX are twisted in such directions as to make the first mating face 153 (the second mating face 253) away from the horizontal plane PY of the point contact PX. The value of the twist acute angle BX (twist acute angle CX) and the shape and size of the bead 161b (bead 261b) are set as follows: at any position where the first blade 100b and the second blade 200b are mutually matched to open or close, the anti-slip rib 161b is not in contact with the anti-slip rib 261b, the anti-slip rib 161b is not in contact with the second matching surface 253, and the anti-slip rib 261b is not in contact with the first matching surface 153.

It should be understood by those skilled in the art that the anti-slip region 160b has a more significant anti-slip effect than the anti-slip region 160a when the first blade 100b is compared with the first blade 100 a. Due to the limited overall dimensions of the endoscopic scissors, and the comprehensive consideration of the cutting performance (such as sharpness and anti-slip performance), blunt separation performance (such as prevention of accidental injury of other organs or tissues by sharp corners), and electric excision coagulation performance of the endoscopic scissors, the dimensions of the anti-slip region, the design dimensions of the anti-slip ribs or the anti-slip grooves are usually very small. When the tissue or organ is cut by using the endoscopic scissors, the tissue or organ is coated on the outer surfaces of the first matching surface 153 and the second matching surface 253, and when the sizes of the anti-slip ribs and the anti-slip grooves are smaller, the anti-slip effect of the anti-slip ribs is obviously better than that of the anti-slip grooves.

It will be appreciated by those skilled in the art that if the foregoing sheet metal manufacturing method is used, i.e., the sheet metal is first blanked to form the blades and then cut or ground to form the anti-slip regions, the manufacturing cost of the first blade 100b is extremely high, much higher than that of the first blade 100 a. One of ordinary skill would understand that the MIM fabrication costs of the first blade 100b and the first blade 100a are substantially the same if fabricated using the MIM method, regardless of minor cost differences in mold fabrication. The cost is indeed comparable if only the MIM production link is considered, whereas the cost of the first blade 100b is much lower than the first blade 100a in view of the overall manufacturing costs. It will be appreciated by those skilled in the art that when the first blade 100b (100a) is used to make endoscopic scissors, particularly disposable endoscopic scissors, it is often necessary to perform overall polishing, passivation, cleaning to remove oil or other surface contamination of the blade. In the polishing passivation or cleaning step, the raised anti-slip ribs on the first cutting edge surface of the first blade 100b are convenient to polish, passivate or clean. The anti-slip groove recessed downward on the first cutting edge surface of the first blade 100a is difficult to polish and passivate, and when stored for a long time, the anti-slip groove is easy to accumulate dust or other dirt, and when cleaned (e.g., ultrasonic cleaning), the water flow is not easy to take away the dust or dirt in the anti-slip groove.

It should be apparent to those skilled in the art that the anti-slip effect can be improved by adapting the shape, size and position of the anti-slip ribs. Although the first blade 100a (100b) and the second blade 200a (200b) are disclosed as including anti-slip grooves or anti-slip ribs on the surfaces of the first engagement surface 153 (the second engagement surface 253), one of ordinary skill would appreciate that combinations of anti-slip grooves or anti-slip grooves may be used. In connection with the disclosure of the first blade 100, it is also contemplated that the first cutting edge surface 152 (second cutting edge surface 252) may also include a non-slip rib or groove (as shown in fig. 28), and one of ordinary skill would readily appreciate that a non-slip rib may be extended to intersect the first outer side surface, or other simple adaptations of a non-slip rib may be made. The examples shown in the drawings of the present specification are curved scissors, however, one of ordinary skill would readily recognize that the locking non-slip region design of the present invention could also be applied to straight scissors, and when applied to straight scissors, the first and second blades could be identical. Although the case has been shown in which both the first and second blades include a non-slip region, it will be understood by those skilled in the art that a significant non-slip effect may be achieved by having only one blade include a non-slip region. Although the driving mechanism of the cavity mirror scissors is composed of the driving slider 80 and the connecting shaft 110 in the illustrated case, other disclosed prior arts, such as the chute mechanism or the link mechanism disclosed in US5478347, US6168605, US8114107, etc., can be adopted instead. Or slightly modified and substituted for the drive slide 80 and connecting shaft 110 of the present invention in accordance with the teachings of the prior art.

Many different embodiments and examples of the invention have been shown and described. One of ordinary skill in the art can adapt the methods and apparatus described herein by making appropriate modifications without departing from the scope of the invention. Several modifications have been mentioned, and other modifications will occur to those skilled in the art. The scope of the invention should, therefore, be determined with reference to the appended claims, and not be construed as limited to the details of structure, materials, or acts shown and described in the specification and drawings.