JP2018099306A - Medical scissors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide medical scissors preventing fitting/fixing parts from moving and getting unstable when surgical procedure is performed.SOLUTION: Respective one ends of a pair of handles form an upper blade and a lower blade, the respective other ends of the pair of grip parts constitute grip parts, and the upper blade and the lower blade are opened/closed by opening/closing of the grip parts, with a point of support at which the grip parts intersect, used as a center. Rear ends of the grip parts include fitting parts, a rear end of one of the fittings includes an opening part and the rear end of the other has such a tip shape as to be inserted into the opening and fit and fix the two grip parts. The tip shape is configured to extend in the longitudinal direction of the grip part and then in the vertical direction thereof, so as to be fitted at one part. The opening includes a trapezoidal part where the opening width is taperedly narrowed toward the rear part, while the tip shape has a narrowed part that moves along the taper of the opening part and is fitted with the taper at one part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to medical scissors, and more particularly to medical scissors suitable for neurosurgery and the like.

  Scissors normally cut two objects by passing two blades through a rotatable shaft, rubbing the blades, placing the object between the blades, and closing the blade. A structure has been created in which one point reliably rubs from the blade edge to the blade edge, so that the object sandwiched between the rubbed parts can be cut. This mechanism is the same for both big and small ones.

  The scissors for medical use have various structures, materials, and dimensions depending on the surgical target site. In particular, scissors used for brain surgery and the like are small in size, and it is common to hold a pencil so as to perform an operation while monitoring an image. For this purpose, the pair of gripping parts on the opposite side of the blade is generally fixed. Furthermore, in order to facilitate the adjustment and assembly of the blade sharpness, it is common that the two blades are separated and manufactured, and then the two blades are assembled and integrated.

  Therefore, it is preferable that the tip of the cutter gripping part is fitted and fixed at the time of assembly. Such scissors for medical use have an upper blade and a lower blade, there are both grip portions made of an elastic material behind the fulcrum, and an opening portion and an insertion portion are provided at the end of each grip portion, What is comprised so that a fitting part may be formed is known (patent document 1). However, the simple insertion method with a gap in size is unstable because the insertion part is easy to move back and forth, up and down, and left and right, compared to welding and fixing, especially when it moves up and down. It has been pointed out that it often has a negative effect on the body and interferes with surgery.

JP 2012-90919 A

  An object of the present invention is to provide a scissor that solves the above-described problems and stabilizes the fitting and fixing of the gripping portion.

The present invention provides the following inventions in order to solve the above problems.
(1) Each tip of the pair of handle portions forms an upper blade and a lower blade, each other end of the pair of handle portions forms a grip portion, and the grip portion is centered on a fulcrum where the handle portions intersect. It is a scissors for medical use that opens and closes the upper and lower blades.
At the rear end of the gripping part, it has a fitting part,
There is an opening in one rear end of the fitting portion,
The other rear end has a tip shape for inserting and fixing the two gripping portions by inserting into the opening, and the tip shape is at one place in the longitudinal direction of the gripping portion and the direction perpendicular thereto. Configured to be mated,
The opening includes a trapezoidal portion having a taper with an opening width narrowing toward the rear,
The tip shape is configured to have a constriction that moves along the taper of the opening and fits into the taper in one place;
The gripping portion has a plate thickness t1, the opening has a trapezoidal portion so as to have a maximum lateral width W1 and a minimum lateral width W4, and the tip shape is a width of the rear end portion of the lateral width W2 and the constriction. scissors for medical use comprising a gap having t2 and a minimum width W3, and having a fitting portion configured to have dimensions such that W1>W2>W3> W4 and t1 <t2. .
(2) The scissors for medical use according to (1), wherein the trapezoidal portion is offset asymmetrically from the center in the longitudinal direction of the gripping portion.
(3) The scissors for medical use according to (1) or (2), wherein the constriction is offset asymmetrically in the vertical direction from the center with respect to the longitudinal direction of the grip portion.
(4) The medical scissors according to any one of the above (1) to (3), which are scissors for neurosurgery, cardiovascular surgery, plastic surgery, or otolaryngology surgery.

  ADVANTAGE OF THE INVENTION According to this invention, the scissors can be easily assembled and the medical scissors which prevented the fitting fixing | fixed part from moving and becoming unstable in the case of a treatment can be provided.

The figure which shows an example of a medical scissors. The figure explaining roughly fitting and fixation of the scissors holding | grip part for medical treatment of this invention. The figure which shows the site | part of each part of the scissors holding | grip part for medical treatments of this invention, and the conditions of the dimension. The embodiment example is shown about the shape of the opening part of the holding part of the medical scissors of this invention. The figure which shows the embodiment of the opening part of the holding part of the medical scissors of this invention, and a front-end | tip shape.

  In the scissors of the present invention, each tip of a pair of handle portions forms an upper blade and a lower blade, each other end of the pair of handle portions forms a gripping portion, and a fulcrum where the handle portions intersect is the center. The scissors for medical use in which the upper blade and the lower blade are opened and closed by opening and closing the grip portion.

  The scissors for medical use of the present invention have a fitting portion at the rear end of the gripping portion, an opening portion in one rear end of the fitting portion, and an opening portion in the other rear end. It has a tip shape for inserting and fixing the two gripping portions, and the tip shape is configured to be fitted at one place in the longitudinal direction of the gripping portion and the direction perpendicular thereto.

The opening includes a trapezoidal portion having a taper with an opening width narrowing toward the rear,
The tip shape is configured to move along the taper of the opening and have a constriction that fits at one location with the taper.

  The gripping portion has a plate thickness t1, the opening has a trapezoidal portion so as to have the maximum width W1 and the minimum width W4, the tip shape is the rear end portion of the width W2, and the constriction is the width t2. It is constituted by a gap having a minimum lateral width W3, and has a fitting portion constituted so as to have dimensions such that W1> W2> W3> W4 and t1 <t2.

  As a preferred embodiment example of the gripping portion of the medical scissors of the present invention, the trapezoidal portion of the opening can be formed into an asymmetric trapezoidal shape with the trapezoidal shape vertically from the longitudinal center line of the gripping portion. By doing so, the gripping part is offset from the center line, and when holding the scissors so as to hold the pen, when holding the scissors in the right hand, the thumb is in the right twist direction Since the force is applied and the gripping part and the blade are integrated with each other, the two blades can be brought into contact with each other more strongly without opening the mouth. The offset can thus form a trapezoidal shape of the opening so that the two blades are in greater contact.

  As a preferred embodiment example of the medical scissors of the present invention, the tip-shaped constriction can be made asymmetrical vertically from the grip center line as in the above example. By doing in this way, the two blades can be made to come into stronger contact with the action of the thumb as well, and the blades can cut the object well.

  As a preferred embodiment example of the medical scissors of the present invention, the trapezoidal shape of the opening is shifted asymmetrically from the center line and the constriction of the tip shape is shifted asymmetrically from the centerline vertically. With the opening / closing operation, the two blades can be made to contact each other more strongly.

  The medical scissors of the present invention are suitably used for medical purposes, and particularly suitable for medical applications such as cutting of living tissue in surgery, particularly neurosurgery, cardiovascular surgery, plastic surgery, otolaryngology surgery, etc. Used for.

  Hereinafter, the structure of the medical scissors of the present invention will be described in more detail with reference to the drawings and embodiments of the present invention.

FIG. 1 is a diagram schematically showing the structure and features of the medical scissors of the present invention for easy understanding. In FIG. 1, the upper blade 11 is made of, for example, a superelastic alloy, and can be made of, for example, an alloy represented by Ti ₃ (Nb, Ta, V) + (Zr, Hf) + O. The lower blade 12 can be formed of stainless steel knife. 3 is a fulcrum (required). Reference numerals 41, 42, 51, and 52 denote gripping portions. 51 and 52 constitute a part of the gripping part and are constituted by members imparted with a spring property. 53 is a fitting part.

FIG. 2A schematically shows the opening 54 and the tip shape 55 at the tip of the spring portion.
FIG. 2B is a diagram schematically showing a state in which the opening 54 and the tip shape 55 are fitted and fixed. FIG. 3 is a diagram schematically showing the shape of the opening 54 and the tip shape 55, and is a diagram for explaining the dimensions of each part and the mutual dimensional conditions. The tip shape 55 has a constricted portion.

  4 (a), 4 (b) and 4 (c) are diagrams showing an embodiment of the shape of the opening of the grip portion of the medical scissors of the present invention. FIG. 5A is a diagram in which the trapezoidal shape is shifted to the left and right from the longitudinal center line of the gripper, and FIG. 5B is a diagram in which the constriction of the tip shape 55 is laterally shifted from the longitudinal centerline of the gripper. Show. The example embodiment of FIG. 4 is not limited to that shown. Other embodiments can be mentioned as long as the opening 54 and the tip shape 55 can be fitted to each other and fixed at one point. Further, the embodiment shown in FIG. 5 is not limited to the illustrated example. Other embodiments that enhance the contact at the time of opening and closing the two blades can be mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, the scissors used suitably for medical uses, such as the cutting | disconnection of the tissue in neurosurgery etc., can be provided.

3 fulcrum 11 upper blade 12 lower blade 41, 42, 51, 52 gripping portion 53 fitting portion 54 opening portion 55 tip shape

Claims (4)

Each tip of the pair of handle portions forms an upper blade and a lower blade, each other end of the pair of handle portions forms a grip portion, and is opened by opening and closing the grip portion around a fulcrum where the handle portions intersect. A scissors for medical use that open and close the blade and lower blade,
At the rear end of the gripping part, it has a fitting part,
There is an opening in one rear end of the fitting portion,
The other rear end has a tip shape for inserting and fixing the two gripping portions by inserting into the opening, and the tip shape is at one place in the longitudinal direction of the gripping portion and the direction perpendicular thereto. Configured to be mated,
The opening includes a trapezoidal portion having a taper with an opening width narrowing toward the rear,
The tip shape is configured to have a constriction that moves along the taper of the opening and fits into the taper in one place;
The gripping portion has a plate thickness t1, the opening has a trapezoidal portion so as to have a maximum lateral width W1 and a minimum lateral width W4, and the tip shape is a width of the rear end portion of the lateral width W2 and the constriction. scissors for medical use comprising a gap having t2 and a minimum width W3, and having a fitting portion configured to have dimensions such that W1>W2>W3> W4 and t1 <t2. .   The medical scissors according to claim 1, wherein the trapezoidal portion is offset asymmetrically in the vertical direction from the center with respect to the longitudinal direction of the grip portion.   The medical scissors according to claim 1 or 2, wherein the constriction is offset asymmetrically in the vertical direction from the center with respect to the longitudinal direction of the grip portion.   The scissors for medical use according to any one of claims 1 to 3, which are scissors for neurosurgery, cardiovascular surgery, plastic surgery, or otolaryngology surgery.

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