JP2017121310A - Medical scissors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide medical scissors eliminating trouble such as nick during an operation, significantly reducing friction resistance in cutting, and having significantly-enhanced sharpness of cutting edges.SOLUTION: Medical scissors 1 include: an upper blade 3 in which a blade for holding a cutting object is linearly formed or formed into a curved shape approximating to a straight line; a lower blade 2 curved toward a tip end side for cutting the cutting object held by the upper blade, where the upper blade and the lower blade rotationally cross with each other, with a spindle used as a fulcrum; and a handle 5 made of a metallic material such as a stainless steel, formed at the back of the spindle. The medical scissors further includes diamond-like carbon films at the upper/lower blade edges vertically crossing with each other, and portions adjacent to the inner/outer sides thereof.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a medical scissors used for surgery in various medical fields such as surgery, brain surgery, and vascular surgery.

  The purpose of this invention is to increase the strength of the cutting edge of a medical scissors and to improve the ease of cutting and the durability associated with a decrease in frictional resistance during cutting.

JP 2003-305047 A

The invention according to claim 1 is a metallic medical instrument having a part that is in direct contact with a living body, and at least the part that is in direct contact with the living body has a resistivity ρ of 10 ⁵ Ω · m or more. This is a ceramic-coated medical device characterized by being coated with an insulating ceramic film.
The invention according to claim 2 is the ceramic-coated medical instrument according to claim 1, wherein the ceramic film has a thickness of 0.05 to 5.0 μm.
The invention according to claim 3 is the ceramic-coated medical according to claim 1 or 2, wherein the ceramic film is made of at least one selected from the group consisting of nitrides, carbides and oxides of Al, B and Si. It is an instrument.
The invention according to claim 4 is the ceramic-coated medical device according to any one of claims 1 to 3, wherein the medical instrument is any one of tweezers for living body, forceps, scissors for operation, or a scalpel for operation. It is an instrument.

Claim 4 of Patent Document 1 discloses a ceramic-coated medical instrument for the invention of a medical scissors as either a surgical scissor or a surgical scalpel as a medical instrument.
And, in the above patent publication, as an effect of the invention in paragraph 0031 of the specification, according to the present invention, when performing surgery or the like, there is no adverse effect on living tissue or cells. There is a description that a ceramic-coated medical device having excellent properties can be obtained with peace of mind.

However, it is a fact that a medical scissors used in a medical field such as an actual operation may not be put to practical use due to the occurrence of blade sharpening after several or tens of uses. In particular, when the upper blade has a linear shape and the cutting edge shape of the lower blade facing the upper blade is a curved shape from the inside to the outside, the side shape with the upper blade and the lower blade closed is a so-called side shape. In a scissors-shaped medical scissors, the load on the lower blade during cutting of the object to be cut is very large in the process of closing the upper blade and the lower blade during cutting work, and the lower blade is against the hard object to be cut In other words, an important problem to be solved is that the blade is worn by several uses.
Therefore, it is difficult to use during a surgical operation or the like in a long-time surgical operation or the like, and it is possible that a situation that may have a serious influence on the surgical operation or the like may occur.

  The present invention solves the problem of blade cutting during operation of a conventional medical scissors including surgical scissors, etc., and in medical work etc. in surgery etc., doctors etc. can continue to perform medical acts etc. with peace of mind, during surgery etc. Endures long-term use of medical scissors, etc. by cutting down the frictional resistance of the upper and lower blades at the time of cutting the object to be cut, and the medical scissors at the time of cutting It is an object of the present invention to provide a medical scissors in which the frictional resistance of the blade portion is greatly reduced, the cutting operation can be smoothly performed, and an excessive burden is not imposed on a surgeon including a doctor.

  In addition, the present invention provides a friction between the cutting blades when cutting an object to be cut by the upper blade and the lower blade by forming a diamond-like carbon layer at least at the blade tip portion and in the vicinity of the conventional medical scissors. Combined with a significant decrease in resistance, the sharpness of the blades is further improved, the contact surfaces of the upper and lower blades are slippery, the risk of blade crushing is eliminated, and the affected parts of the human body and cut parts of animals etc. The purpose is to enable smooth cutting for all cutting operations, removal of affected areas, and the like, and to significantly reduce the time for cutting operations and the like.

  Furthermore, the present invention provides a medical scissors that can withstand long-term use, and is excellent in the durability of the medical scissors themselves. Corrosiveness, low frictional resistance, excellent corrosion resistance, and smooth cutting work can greatly reduce the burden of cutting work by doctors, etc. An object of the present invention is to provide a medical scissors that can eliminate the interruption of work due to blade cutting and can continuously achieve a smooth medical practice.

  The medical scissors according to the present invention include an upper blade in which a blade for holding an object to be cut is formed in a shape that is linear or approximate to a straight line, and a tip that cuts the object to be cut held by the upper blade The lower blade that is bent toward the pivot is a medical scissors made of a metal material such as stainless steel having a handle on the back of the support shaft and a handle behind the support shaft, A medical scissors characterized by having a diamond-like carbon film in the vicinity of the upper and lower cutting edge portions that intersect vertically and the inside and outside thereof.

  The invention according to claim 2 of the present invention is a medical scissors characterized in that the film thickness of the diamond-like carbon film structure at the cutting edge portion of the medical scissors according to claim 1 is 0.1 μm to 5 μm. .

  In the medical field or the like, the invention according to claim 1 is held by the upper blade in which the cutting blade is formed in a straight line or a shape approximating a straight line in a cutting operation of an object to be cut that is an operation target. A curved lower blade that cuts an object to be cut intersects with a pivot of a medical scissors so as to be rotatable, and is made of a cutlery steel such as stainless steel having a handle behind the spindle. This is a medical scissors, and each of the cutting edge portions that intersect with each other and the vicinity thereof has a diamond-like carbon film, so that the object to be cut held by the upper blade and the lower blade rotates around the support shaft as a fulcrum. Since the friction coefficient at the time of crossing between the upper and lower cutting edge parts is greatly reduced by the formation of the diamond-like carbon film even when cutting the object to be cut by freely intersecting, the sliding of the upper blade and the lower blade crossing Will be smooth and up and down Combined with a significant reduction in the friction coefficient between diamond-like carbon films, smooth cutting between the upper and lower blades allows the work to be cut to be performed smoothly and quickly. Work and treatment itself are performed smoothly, and the burden on both the practitioner including the doctor and the patient on the treatment side is greatly reduced.

  In addition, according to the present invention, the formation of a diamond-like carbon film in the upper and lower cutting edge portions that intersect and the vicinity thereof greatly reduces the frictional resistance that occurs when both cutting edges cross each other, so that the cutting operation of the target portion can be performed smoothly and quickly. It is easy and smooth, etc., and the labor required for the surgeon's operation work, etc. and the surrounding staff etc. are greatly reduced, and the burden on both patients and doctors etc. is reduced As a result, both concerns about surgery and the like are resolved at once, which contributes to an improvement in work efficiency.

It is the enlarged front view which gave DLC film to each blade tip part of the upper blade and lower blade of the medical scissors which show one example of the present invention. It is an enlarged front view which shows the state which the medical scissors which show one Example of this invention closed.

Hereinafter, the present invention will be specifically described with reference to the drawings.
FIG. 1 is an enlarged front view of a medical scissors, in which a diamond-like carbon film is formed in the vicinity of the blade tip including the tip.
The medical scissors 1 are a moving blade (hereinafter referred to as a lower blade 2) whose blade is formed in a curved shape toward the crossing side, and a stationary blade (hereinafter referred to as a straight shape approximating a straight line). , The upper blade 3) and the inner side and the outer side of the neck 4 of the lower blade 2 and the upper blade 3 are bent toward the inside. In the conventional neck portion 4, the curved shapes on the inner side and the outer side are formed with the same curvature. However, in the present invention, at least the curvatures on the outer side of the neck portion 4 and the inner side of the neck portion 4 of the lower blade 2 are changed. Is characterized in that the curvature is formed smaller than the conventional one (the radius R is made larger). By reducing the curvature of the neck 4 on the inner side of the lower blade 2 (that is, forming the radius of the curve bending inside the lower blade 2 larger than the radius of the curve bending outside the lower blade 2), the upper blade Since the present invention becomes smaller at the position where the elevation angle α of the straight blade 3a 3 and the curved blade 2a warped outside the lower blade 2 are the same, the object to be cut can be cut closer to the base of the blade, and the cutting work The burden on the doctor who performs the operation can be reduced, and the cutting work can be done with a small force.

  In the figure, reference numeral 5 denotes a handle, and 6 denotes a pin (which may be a screw) serving as a support shaft for cutting the object to be cut by the lower blade 2 and the upper blade 3 intersecting the tip of the handle 5. Show. In the present invention, the overall shape of the handle 5 is omitted, but the shape and structure are not particularly limited as long as it is easy to operate.

The lower blade 2 is a metal material including high carbon stainless steel having hardness and corrosion resistance, and is, for example, a stainless steel material having a hardness of HRC56 to 63 or more.
As the steel material used for the lower blade 2, for example, 13% Cr (martensitic) stainless steel is used in consideration of strength and rust. 13% Cr stainless steel is suitable as a medical instrument and blade because it has heat, hardness, mechanical properties, strength, and corrosion resistance. However, the material is not limited to the stainless steel as long as the material has hardness, mechanical properties, strength, and corrosion resistance, and other metal materials may be used.

  If the radius of the inner curved line intersecting with the upper blade 3 of the neck 4 of the lower blade 2 is, for example, 70 mm in the conventional art, the radius is made larger than that, for example, the radius of curvature is reduced to 94 mm (radius). It is important to increase R). The curved terminal located inside the neck 4 of the lower blade 2 and the base of the lower blade 2a are smoothly and continuously connected.

  The upper blade 3 shows the case where it forms with the multilayer laminated material of stainless steel knife steel. In this example, a case where seven stainless steel plates having a thickness of 0.2 mm are laminated is shown, but the number of laminated layers and the thickness are appropriately changed according to the application, and are not limited to the above numerical values. . Depending on the purpose of use, it can be reduced or increased. After heat treatment or cold treatment, the laminated plate is subjected to forging treatment in the plate thickness direction and the end surface on the blade side that holds the object to be cut, thereby changing the structure of the contained elements, and changing the component elements and moving between layers In order to roughen the blade end surface of the upper blade 3 holding the object to be cut by the inter-layer movement or the like in which the surface is formed in a wavy shape by the movement of the constituent elements, etc., when cutting with the curved blade 2a of the lower blade, The object to be cut can be cut while being reliably held by the blade end surface of the upper blade 3.

The surfaces of the lower blade 2 and the upper blade 3 are covered with a diamond-like carbon film at the upper and lower blade tip portions that intersect vertically or laterally or obliquely and in the vicinity thereof.
The diamond-like carbon film has a thickness of 0.1 μm to 5 μm. In the experiment, the thickness of the diamond-like carbon film was 2 μm, but it is not limited to this.

  A method for producing a diamond-like carbon film (DLC film) will be described. DLC is synthesized from carbon-containing gases such as methane or solid materials such as graphite. Energy is given to these raw materials by discharge or the like to generate positive ions containing carbon, and these ions are accelerated by an electric field and supplied onto the cathode substrate, thereby generating a DLC film on the substrate. In the DLC, the substrate temperature is usually from room temperature to 200 ° C. and at most 500 ° C., and is characterized by being lower than 800 ° C. of diamond. DLC does not form in the absence of ions, but at the same time, neutral radicals and clusters are thought to contribute to film formation, and the ratio of ions to radicals reaching the substrate affects the DLC synthesis rate and film quality. It will be.

  The present invention relates to a medical scissors such as a micro scissors used for surgery in various medical fields such as surgery, brain surgery, and vascular surgery. When excising a part, it is an instrument that can be surely and neatly cut in a short time, and withstands long-term use, so demand for medical manufacturers, distributors, doctors, and the like is aroused.

DESCRIPTION OF SYMBOLS 1 Medical scissors 2 Lower blade 2a Curved blade of lower blade 3 Upper blade 3a Straight blade of upper blade 4 Neck part 5 Handle 6 Pin 7 DLC film

Claims (2)

  An upper blade in which a blade for holding an object to be cut is formed in a linear shape or a curved shape approximating a straight line, and a lower blade that is bent toward the tip side for cutting the object to be cut held by the upper blade; Is a medical scissors made of a metal material such as stainless steel having a handle behind the support shaft and having a handle behind the support shaft, and the upper and lower cutting edge portions intersecting the upper and lower sides. And a medical scissors comprising a diamond-like carbon film in the vicinity of the inside and outside thereof. The medical scissors characterized in that the film thickness of the diamond-like carbon film structure at the cutting edge portion of the medical scissors according to claim 1 is 0.1 µm to 5 µm.

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