JP2015078939A - Medical knife - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical knife which has two replaceable blade holding structures individually corresponding to two kinds of replaceable blades and can perform cutting work with a feeling on the replaceable blade like a part of fingertips even when either replaceable blade is mounted.SOLUTION: A replaceable blade holder 1 includes two replaceable blade holding structures individually corresponding to two kinds of replaceable blades 19, and the replaceable blade 19 held in each replaceable blade holding structure protrudes from different positions apart from each other on the circumference of the replaceable blade holder 1. The protrusion direction of the replaceable blade 19 held in one replaceable blade holding structure and the protrusion direction of the replaceable blade held in the other replaceable blade holding structure are different from each other.

Description

  The present invention is a medical knife mainly used for cutting a pathological sample or the like, and a microtome blade that is used for a microtome as a thin slicer for a sample piece and has a reduced sharpness is used as a trimming cutter for tissue examination. The present invention relates to a medical knife for reuse.

  A handle of a medical knife to which two types of replaceable blades having different sizes can be attached has conventionally existed as described in Patent Document 1, for example. This conventional handle is formed in a clip shape, and a pair of replacement blade holding portions that hold and hold the replacement blade from both sides of the surface thereof are pressed against each other by the elastic force of the spring. The replacement blade clamping portion is provided at the front end portion of the handle, and has two replacement blade holding structures respectively corresponding to two types of replacement blades having different sizes, and both replacement blade holding structures are adjacent to each other. It is provided to do. In use, only one replaceable blade is held in the replaceable blade holding structure and used. The replacement blade held in the replaceable blade holding structure and the replaceable blade in the other replaceable blade holding structure are used. When is held, the direction in which the replacement blade protrudes is the same direction.

  As described above, the conventional handle is provided with a pair of replacement blade clamping portions adjacent to each other at the front end portion thereof. And the finger | toe contact surface used by putting a finger | toe on the both-sides surface of the front-end part of each replaceable blade clamping part is formed. Therefore, in use, the abdomen of the tip of the thumb and forefinger is directed to the finger contact surface close to the replacement blade, the handle is picked from both sides, and the cutting work is carefully performed. Further, since the two replacement blade holding structures are provided adjacent to each other, the width of the front end portion of the handle has a width corresponding to two replacement blades. For this reason, even if any replacement blade is attached, the replacement blade is attached at a position shifted in the width direction from the center of the front end of the handle, so that the replacement blade is also on the side from the fingertip that is directed to the finger contact surface. It will shift to the direction. When the fingertip and the replacement blade do not deviate, the center of the replacement blade and the center of the fingertip addressed to the finger contact surface do not deviate so much, so the cutting operation is performed with the feeling that the replacement blade is part of the fingertip. be able to. Thereby, it is easy to work when performing a fine work such as cutting a sample finely. However, if the center of the fingertip and the replaceable blade is misaligned as in the conventional handle, the fingertip that is addressed and the replaceable blade may be very close. The difference becomes noticeable and makes the operator feel uncomfortable. For this reason, there is a possibility that the work to be adjusted with the fingertip, such as the force applied to the replacement blade and the angle of the blade edge of the replacement blade, may be out of the operator's intention. In order to remove the fear, it is conceivable to move the fingertip to the side of the handle, but because one side of the abdomen of the fingertip comes off from the finger contact surface of the handle, it becomes unstable when holding the handle, There is a risk that the usability will deteriorate. Further, since the conventional handle has two replaceable blade holding structures connected to each other, when the replaceable blade is held in one of the replaceable blade holding structures, the replacement blade mounting gap of the replaceable blade holding structure is caused by the replaceable blade. Although the gap between the other replacement blade holding structure remains open, there is a possibility that the replacement blade cannot be securely fixed, and there is a possibility that dust may enter the gap. Should not be adjacent.

Design Registration No. 1437306

  A medical knife having two replaceable blade holding structures that individually correspond to the two types of replaceable blades so as to be compatible with two types of replaceable blades of different sizes, etc., regardless of which replaceable blade is attached. An object of the present invention is to provide a medical knife capable of performing cutting work with a feeling that the replacement blade is a part of the fingertip.

The invention described in claim 1 includes a replaceable blade holder and a replaceable blade that can be attached to and detached from the holder. The replaceable blade holder includes a pair of holder parts that can be coupled to each other, and the replaceable blade holding structure provided in each holder part includes A medical knife that cooperates to hold one end of a replaceable blade and the other end of the replaceable blade protrudes from the replaceable blade holder. The replaceable blade holder can be replaced with two types of replaceable blades of different sizes and / or shapes. In order to be able to correspond, it has two replaceable blade holding structures corresponding to these two kinds of replaceable blades individually, and the replaceable blades held in the respective replaceable blade holding structures are different from each other on the periphery of the replaceable blade holder. It is a structure that protrudes from the position, and the direction in which the replaceable blade that is held by one replaceable blade holding structure protrudes from the direction in which the replaceable blade that is held by the other replaceable blade holding structure differs. is there.

According to the second aspect of the present invention, the replacement blade is held between the replacement blade holding structures of both holder parts, and the holder part is relatively rotated about a rotation axis perpendicular to the inner surface of the holder part. It is the structure which can make a blade removable.

The invention described in claim 3 has a configuration in which each holder part has substantially the same outer shape.

The invention according to claim 4 is configured such that the protruding direction of the replaceable blade held by one replaceable blade holding structure and the protruded direction of the replaceable blade held by the other replaceable blade holding structure are directed in opposite directions. is there.

According to a fifth aspect of the present invention, the holder parts are formed in an elongated plate shape having substantially the same size, and are superposed, and the replaceable blade holder has edges for projecting replaceable blades having different widths at both ends thereof. These end edges have a predetermined end length corresponding to the width of the replacement blade protruding from the end edges.

According to a sixth aspect of the present invention, the width of the replaceable blade holder is the largest at the center thereof, and both side edges of the replaceable blade holder come closer to each other from the center of the replaceable blade holder toward each end. The direction in which the cutting edge of the replaceable blade held by the replaceable blade holder extends is the same direction as one of the side edges that approach each other.

According to the seventh aspect of the present invention, a notch recess is formed in one side edge of the replaceable blade holder and the notch recess is formed in one holder part, and the notch recess is also formed in the other side edge of the replaceable blade holder. The cut-out recess is formed in the other holder part, and both the cut-out recesses are formed in a portion separated from the rotation axis of the replaceable blade holder by substantially the same distance.

The invention according to claim 8 is configured such that both holder parts can be disassembled.

In the invention described in claim 1, the replaceable blade holder has two replaceable blade holding structures individually corresponding to two types of replaceable blades having different sizes and / or shapes, and the replaceable blade holders are held by the replaceable blade holding structures. The blade protrudes from different positions on the periphery of the replaceable blade holder, and is held by the replaceable blade holding structure and the direction in which the replaceable blade is held by one replaceable blade holding structure. The direction in which the replacement blade protrudes is different. Therefore, both replaceable blade holding structures are not adjacent to each other, and are provided separately without interfering with other replaceable blade holding structures, so the held replaceable blade and the front end of the replaceable blade holder It is possible to form the replaceable blade holder so that the fingertip addressed to the provided finger contact surface does not shift in the width direction. Furthermore, since both of the replacement blade holding structures are provided separately, it is easy to handle and operate. As a result, it is possible to provide an easy-to-use medical knife that can perform a cutting operation without a sense of incongruity with a feeling that the replacement blade is part of the fingertip. Moreover, it becomes possible to fix a replaceable blade reliably by setting it as a replaceable blade holding | maintenance structure suitable for a replaceable blade which has a different size and shape. In the handle of Patent Document 1, two replacement blade holding structures are connected side by side. Therefore, when the replacement blade is held by one of the replacement blade holding structures, the replacement blade mounting gap of the replacement blade holding structure is caused by the replacement blade. Although it is buried, the gap of the other replaceable blade holding structure remains open, so that dust may enter the gap.

According to the second aspect of the present invention, the replacement blade is held between the replacement blade holding structures of both holder parts, and the holder part is relatively rotated about a rotation axis perpendicular to the inner surface of the holder part. The blade can be detachable. That is, when the holder parts are rotated relatively, the replaceable blade holding structure is sufficiently exposed and easy to see, and the replaceable blade can be easily set in the replaceable blade holding structure. The handle of Patent Document 1 is a clip and is thin. This is because it becomes difficult to use if it is formed thick. Since it is formed thin, the range in which the tip of the clip is widened is limited, the replacement blade holding structure inside the clip is difficult to see when the replacement blade is attached and detached, and it may take time to install the replacement blade.

In the invention according to claim 3, each holder part has substantially the same outer shape. Therefore, when holding the replaceable blade holder and placing the finger on the finger contact surface and using the knife, the outer periphery of both holder parts is aligned, so that the holder can be gripped and operated without a sense of incongruity.

In the invention according to claim 4, the protruding direction of the replaceable blade held by one of the replaceable blade holding structures and the protruded direction of the replaceable blade held by the other replaceable blade holding structure are directed in opposite directions. Therefore, since the two replaceable blade holding structures are provided separately from each other, it is not necessary to widen the width of the end of the holder part with respect to the width of the replaceable blade as in Patent Document 1, and is held. It is possible to form the replaceable blade holder so that the replaceable blade and the fingertip addressed to the finger contact surface provided at the front end of the replaceable blade holder are not displaced in the width direction. Thereby, the cutting operation can be performed without a sense of incongruity with a feeling that the replacement blade is a part of the fingertip. Moreover, even if two types of replaceable blades are held and used at the same time, the other replaceable blade does not get in the way during use.

  According to a fifth aspect of the present invention, the holder parts are formed in an elongated plate shape having substantially the same size, and are superposed, and the replaceable blade holder has edges for projecting replaceable blades having different widths at both ends thereof. The end edges have a predetermined end length corresponding to the width of the replaceable blade protruding from the end edges. In use, the abdomen of the tip of the thumb and forefinger is directed to the finger contact surface, and the blade holder is picked from both sides. Normally, the replacement blade at the end of the blade holder attached is used as the finger contact surface. A position close to is selected. In the invention according to claim 5, since the width of the edge has a width corresponding to the width of the replaceable blade, the width of the edge and the width of the replaceable blade are the same or slightly different, and the replaceable blade holder There is almost no deviation between the fingertip and the replacement blade projecting from the edge of the replacement blade holder when the fingertip is placed on the finger contact surface close to the replacement blade at the end. As a result, the cutting operation can be performed without a sense of incongruity with a feeling that the replacement blade is a part of the fingertip.

  According to a sixth aspect of the present invention, the width of the replaceable blade holder is the largest at the center thereof, and both side edges of the replaceable blade holder come closer to each other from the center of the replaceable blade holder toward each end. The direction in which the cutting edge of the replaceable blade held by the replaceable blade holder extends is the same direction as one of the side edges approaching each other. In other words, the replacement blade holder has a shape that is almost diamond-shaped, and when the blade edge of the replacement blade is leveled, the replacement blade holder rises as it goes to the rear end on the rear end side opposite to the side holding the replacement blade. It becomes a shape. The gripping portion of the replaceable blade holder in use is the latter half, and the latter half is gripped so as to be wrapped by the palm, ring finger, and little finger. At this time, since the lower side of the gripping portion is inclined upward with respect to the longitudinal direction of the replaceable blade, there is an effect that the replaceable blade holder can be easily held.

  According to the seventh aspect of the present invention, a notch recess is formed in one side edge of the replaceable blade holder, and the notch recess is formed in one holder part, and the notch recess is also formed in the other side edge of the replaceable blade holder. The cut-out recesses are formed in the other holder part, and both the cut-out recesses are formed at a portion separated from the rotation axis of the replaceable blade holder by substantially the same distance. Therefore, when you try to rotate from the state where both holder parts are completely overlapped to the replacement blade mounting position, with your thumb and index finger pressed against both notch recesses, the depth of the notch recesses will be reduced. Only the holder parts rotate a little. Thereby, since both holder parts mutually shift | deviate in the circumferential direction centering | focusing on a rotating shaft line, a holder part can be easily rotated from the position to a replacement blade attachment / detachment position. In the invention according to claim 8, since both holder parts can be disassembled, they can be sufficiently washed or sterilized after use.

Front view of the present invention in which the holder part is opened in the replaceable blade mounting state Front view of the present invention with the holder parts closed Rear view of the present invention Perspective view of one holder part viewed from the inside Perspective view of the other holder part viewed from the inside A-A enlarged sectional view Inside view of one holder part BB end view CC end view The perspective view of the back side of the present invention Rear view of a wide spare blade attached and the blade tip facing down Rear view of a narrow blade with the blade tip facing down

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the replaceable blade holder 1 includes one holder part 2 and the other holder part 3. As shown in FIG. 11, both holder parts 2 and 3 are formed in a plate shape close to a rhombus having substantially the same size, and their inner surfaces are overlapped with each other, and the center of the shaft portion 4 shown in FIG. It is coupled so as to be relatively rotatable about a rotation axis extending therethrough. Since the replaceable blade holder 1 is obtained by superimposing both holder parts 2 and 3, it has a rhombus shape in the same manner.

First, the structure which couple | bonds both holder parts 2 and 3 rotatably is demonstrated. As shown in FIG. 4, a shaft portion 4 is formed at the center of one holder part 2. Further, as clearly shown in FIG. 6, a concave portion 5 is formed at the center of the shaft portion 4, which is a stealing of injection molding. A pair of partial flanges 6 and 6 are formed in the opposite directions around the tip of the shaft portion 4. The term “partial flange” is used because the flange is not formed over the entire circumference of the shaft portion 4. The partial flanges 6 and 6 are raised by a predetermined height from the inner surface 7 of one holder part 2. Furthermore, the part of the holder part 2 projected by the partial flanges 6 and 6 is formed with arc-shaped holes 8 and 8 having the same shape as that of the partial flanges 6 and 6. These holes 8 and 8 are required for removing the holder part 2 from the mold during injection molding.

  As shown in FIG. 5, a shaft hole 9 is formed in the other holder part 3. A pair of partial inner peripheral surfaces 10, 10 are formed in the shaft hole 9. The length of each arc of the partial inner peripheral surfaces 10, 10 is slightly longer than the length of each arc of the partial flange 6 of one holder part 2. The diameter of the circle formed by the partial inner peripheral surfaces 10 and 10 is slightly larger than the diameter of the circle formed by the outer peripheral surfaces of the partial flanges 6 and 6. Furthermore, the height of each partial inner peripheral surface 10, 10 is formed to be approximately twice the thickness of the partial flange 6, 6.

Further, as shown in FIG. 5, the shaft hole 9 is formed so that the partially reduced inner peripheral surfaces 11, 11 having a diameter reduced from the partially inner peripheral surfaces 10, 10 face each other. The lengths of the respective arcs of the partially reduced inner peripheral surfaces 11, 11 are the outer peripheral surfaces 12 existing between the partial flanges 6, 6 formed on the outer peripheral surface of the shaft portion 4 of one holder part 2. , 12 is the same or slightly shorter than the length of each arc. The diameter of the circle formed by the partially reduced inner peripheral surfaces 11, 11 is slightly larger than the diameter of the circle formed by the outer peripheral surfaces 12, 12 of the shaft portion 4. Furthermore, the height of each partially reduced inner peripheral surface 11, 11 is slightly lower than the distance between the bottom surface of the partial flanges 6, 6 and the inner surface 7 of one holder part 2.

The shaft part 4 of one holder part 2 and the shaft hole 9 of the other holder part 3 are formed in the above-described configuration. Therefore, when both the holder parts 2 and 3 are overlapped while the partial flanges 6 and 6 of one holder part 2 are directed to the partial inner peripheral surfaces 10 and 10 of the other holder part 3, one holder part 2 and the inner surface 13 of the other holder part 3 can be overlapped. At this time, the pair of partial flanges 6, 6 are formed so as to be obliquely arranged with respect to the longitudinal direction of one holder part 2, and the pair of partial inner peripheral surfaces 10, 10 are formed in the longitudinal direction of the other holder part 3. Therefore, when the partial flanges 6 and 6 are overlapped with the partial inner peripheral surfaces 10 and 10, the lengths of the holder parts 2 and 3 are respectively long. The vertical direction must be orthogonal. That is, first, the holder parts 2 and 3 are orthogonal to each other, and then the partial flanges 6 and 6 of one holder part 2 are directed to the partial inner peripheral surfaces 10 and 10 of the other holder part 3, and then They can be combined by rotating them and assembled as a replaceable blade holder 1. Further, the assembled replaceable blade holder 1 can be disassembled and cleaned by a procedure reverse to the assembly. In this embodiment, since both the partial flanges 6 and 6 and both the partial inner peripheral surfaces 10 and 10 are formed in the same size, the partial flange 6 is formed of any of the partial inner peripheral surfaces 10 and 10. 10 will also be met. However, since there is only one correct fit, the length of the arcs of both partial flanges 6 and 6 and both partial inner peripheral surfaces 10 and 10 can be avoided if the connection is improper. By making the lengths and the like different, both holder parts 2 and 3 can be coupled only in a correct fit.

Next, the replaceable blade holding structure of the present invention will be described. FIG. 1 shows a state in which both holder parts 2 and 3 are opened in a replaceable blade mounting state, and a narrow replaceable blade 19 having a fitting hole 20 is positioned. Since there are two fitting holes 20, the left and right ends of the narrow replaceable blade 19 can be turned over and used. Similarly, as shown in FIG. 11, the wide replaceable blade 35 also has a fitting hole 41. FIG. 12 shows a state where both holder parts 2 and 3 are closed and a narrow replaceable blade 19 is attached to the replaceable blade holder 1. FIG. 11 shows a state in which both holder parts 2 and 3 are closed and a wide replaceable blade 35 is attached to the replaceable blade holder 1. Thus, the replaceable blade holder 1 can be attached with the wide replaceable blade 35 and the narrow replaceable blade 19 at both ends thereof, and has two replaceable blade holding structures for attaching them. Since the two replaceable blade holding structures have the same configuration and differ only in size corresponding to the replaceable blade to be attached, the replaceable blade holding structure for attaching the wide replaceable blade 35 on the other hand will be described. The replaceable blade holding structure is configured so that both the holder parts 2 and 3 respectively have one end portion of the replaceable blade in cooperation with each other. First, the replacement blade holding structure for one holder part 2 will be described. As shown in FIG. 4, the replaceable blade holding structure has a blade receiving portion 14. The blade receiver 14 has four surfaces. The four surfaces are the first surface 15, the second surface 16, the third surface 17, and the fourth surface 18. Since these planes are not flush with each other, their features will be described later. As shown in FIG. 4, a fitting protrusion 21 for a wide replaceable blade 35 is formed on the first surface 15. The fitting hole 41 of the wide replaceable blade 35 is fitted into the fitting protrusion 21 so that the replaceable blade 35 is positioned. In addition, a small positioning plate portion 22 for facilitating the positioning of the replacement blade to be attached is formed at the corner of the third surface 17. The positioning plate portion 22 is formed so as to be connected to the inner surface 7 of one holder part 2. Since the third surface 17 is at a position lower than the inner surface 7, there is a space between the inner surface 7 and the inner surface of the positioning plate portion 22, and a replacement blade is inserted into this space. This configuration becomes clear when the positioning plate portion 23 of the other replaceable blade holding structure is viewed. Incidentally, a hole 24 exists below the positioning plate portion 23, and this hole 24 is necessary for removing the holder part 2 from the mold during injection molding. Moreover, the side wall 25 exists in the side of the blade receiving part 14 mentioned above, and it becomes a wall which stabilizes a replacement blade or regulates rotation of the other holder part 3 in a predetermined position.

Next, each surface 15, 16, 17, 18 which the blade receiving part 14 mentioned above has is explained in full detail. FIG. 8 is an end view taken along line BB in FIG. As is apparent from this figure, the first surface 15 is a vertical surface and is a surface that is in close contact with the surface of the replaceable blade when the replaceable blade is completely attached. The second surface 16 is an inclined surface that is inclined so as to become lower as it goes upward. Moreover, FIG. 9 is a CC end view in FIG. As is apparent from this figure, the third surface 17 is an inclined surface that becomes slightly lower as it goes upward. The inclination angle of the third surface 17 is smaller than the inclination angle of the second surface 16. The fourth surface 18 is an inevitable inclined surface as a result of forming the first surface 15, the second surface 16, and the third surface 17 as described above, and has a special meaning. It ’s not a face. In FIG. 7, the highest position in the blade receiver 14 is a ridge line 26 that is a boundary line between the first surface 15 and the second surface 16, and the first surface 15 that follows the ridge line 26.

The reason why the second surface 16 and the third surface 17 are inclined surfaces is to facilitate the attachment of the replacement blade. The replacement blade is attached with one holder part 2 positioned below the other holder part 3, and first, the replacement blade is positioned on the blade receiving portion 14. Accordingly, the procedure for positioning the replacement blade will be described with reference to FIG. The positioning of the replaceable blade is performed by placing the blade edge of the replaceable blade downward in FIG. 7, placing one end of the replaceable blade on the third surface 17, and slightly tilting the replaceable blade, ) May be inserted below the positioning plate portion 22. At this time, the surface of the replaceable blade hits the fitting protrusion 21 and is pressed, but the inclination of the second surface 16 acts as a relief portion of the pressed replaceable blade, so that it can be smoothly inserted. If each surface of the blade receiving portion 14 is flush, there is no escape space for the replacement blade when the fitting projection 21 hits the replacement blade, and the corner of the replacement blade is inserted below the positioning plate portion 22. It's hard to get involved. Therefore, an inclined surface is formed so that it can be smoothly inserted. As shown in FIG. 1, the replacement blade mounting structure of one holder part 2 is almost entirely visible when both holder parts 2 and 3 are opened. It can be carried out.

Next, the replacement blade holding structure of the other holder part 3 will be described. As shown in FIG. 5, the replaceable blade holding structure has a blade receiving surface 27 formed on the inner surface 13 of the other holder part 3. The blade receiving surface 27 is a surface that faces the blade receiving portion 14 of one holder part 2 when both the holder parts 2 and 3 are overlapped. The blade receiving surface 27 and the first surface 15 of one holder part 2 cooperate to hold and hold the replacement blade. On the blade receiving surface 27, an outer groove 28 and an inner groove 29 are formed. The outer groove 28 is a guide groove of the fitting protrusion 21 of one holder part 2, and the inner groove 29 is also a guide groove of the positioning plate part 22. A narrow groove 30 that is continuous with the outer groove 28 is a guide groove for a small protrusion 31 formed on the side surface of one holder part 2. As shown in FIG. 4, the small protrusion 31 slightly protrudes in the vertical direction with respect to the inner surface 7 of one holder part 2. Therefore, when closing both the holder parts 2 and 3, the small protrusion 31 is guided by the narrow groove 30, and then rides on the blade receiving surface 27 in a press-contact state and fits into the receiving hole 32 in a press-contact state. . As a result, it is possible to prevent both the closed holder parts 2 and 3 from opening naturally and to prevent the holder parts 2 and 3 from opening in the thickness direction. Further, as shown in FIG. 10, an arc-shaped notch recess 33 is formed on the side edge of one holder part 2, and an arc-shaped notch recess 34 is also formed on the side edge of the other holder part 3. Therefore, when the holder parts 2 and 3 are opened, if the thumb and the index finger are applied to the portions of the notch recesses 33 and 34 and pressed, the small protrusion 31 and the receiving hole 32 are engaged. The two holder parts 2 and 3 are relatively rotated by a depth corresponding to the depth of the notch recesses 33 and 34 so that the holder parts 2 and 3 can be easily opened at a predetermined angle. .

As described above, the replaceable blade holder 1 of the present invention becomes a medical knife 39 by attaching the wide replaceable blade 35 or the narrow replaceable blade 19 to both ends thereof. The state is shown in FIG. 11 and FIG. FIG. 11 shows a state in which a wide replaceable blade 35 is attached, and FIG. 12 shows a state in which a narrow replaceable blade 19 is attached. Here, the size of the present embodiment will be described. The total length of the replaceable blade holder 1 is about 110 mm, the maximum width is about 30 mm, and the maximum thickness is about 10 mm. The wide replaceable blade 35 has a length of about 76 mm, the narrow replaceable blade 19 has a length of about 80 mm, the wide replaceable blade 35 has a width of about 14 mm, and the width of the narrow replaceable blade 19 Is about 8 mm. Of course, the present invention is not limited to these numerical values. As is apparent from the figure, the replaceable blade holder 1 is substantially diamond-shaped. However, instead of the regular rhombus, as shown in FIG. 11, the replaceable blade holder 1 has a shape close to a rhombus in which end edges 37 and 38 having a predetermined width are formed. The width of one end edge 37 is formed wider than the width of the other end edge 38, the wide replacement blade 35 is attached so as to protrude from one end edge 37, and the width from the other end edge 38 is narrow. The replacement blade 19 is attached so as to protrude. The width of one end edge 37 is slightly longer than the width of the wide replacement blade 35 attached thereto. As shown in FIG. 4, the long reason is that a side wall 25 is formed on the side, and the side wall 25 must be made longer by that amount. When using the medical knife 39, the replaceable blade holder 1 is grasped by hand, and a portion adjacent to one end edge 37 is sandwiched between the thumb and the index finger from both sides. At this time, as described above, the width of the one end edge 37 is slightly longer than the width of the wide replaceable blade 35 attached thereto, but slightly. Therefore, both the fingertips addressed to the surface of the distal end portion of the replaceable blade holder 1 and the wide replaceable blade 35 are not displaced or only slightly displaced. In this respect, it differs from Patent Document 1. Therefore, the replacement blade 35 can be operated with the same feeling as the fingertip, and an accurate cutting operation can be performed. In addition, the replaceable blade 35 is attached so that the cutting edge 40 of the wide replaceable blade 35 and one side 36 of the replaceable blade holder 1 that is continuous with the wide end blade 35 are aligned in a substantially straight line. Therefore, as apparent from FIG. 11, the second half of the replaceable blade holder 1 on the opposite side to the side holding the replaceable blade tilts upward when used, so that the replaceable blade holder 1 is easy to grip and cuts a sample or the like. It is easy to cut an object, and it has the effect of being less fatigued. The same applies to the case where the narrow replaceable blade 19 shown in FIG. 12 is attached.

In addition, this invention can take a various aspect based on the structure mentioned above. For example, the replaceable blade holder 1 may be formed in a shape different from the embodiment, such as a “<” shape when viewed from the front. In this case, the protruding directions of both of the replaceable blades are not opposite to each other and form an angle smaller than 180 °. The holder parts 2 and 3 of the present embodiment are each integrally molded of a thermoplastic resin, but other materials and manufacturing methods may be used as long as the product can be established. For example, you may shape | mold by a metal powder injection molding method (MIM). In the present embodiment, the longitudinal direction of the replaceable blade holder 1 and the longitudinal direction of the replaceable blades 19 and 35 attached thereto are not the same direction, but the replaceable blade is attached to the replaceable blade holder 1 so as to be in the same direction. Also good. The method of joining the holder parts 2 and 3 may be a method other than that of the embodiment, for example, screwed or magnetically joined. Further, the surfaces of the holder parts 2 and 3 may be subjected to anti-slip processing. For example, a large number of small protrusions may be provided on the surface or covered with an elastomer resin. Moreover, it is good also as providing three or more types of replaceable blades by providing three or more replaceable blade holding structures. Moreover, you may make it the structure which makes it possible to attach the sheath and cap which cover a blade in a replacement blade mounting state. Further, in the embodiment, when both holder parts 2 and 3 are opened to the replaceable blade mounting state, the replaceable blade holding structure at both ends appears, but instead, both replaceable blade holding structures are independently represented separately. It may be configured to be able to. For example, the other holder part 3 is divided into two parts, and the two parts rotate around different rotation axes. Moreover, in this embodiment, the fitting hole 41 of the wide replaceable blade 35 is fitted to the fitting protrusion 21, and the replaceable blade 35 is positioned. Instead, when the replaceable blade is a magnetic material, Further, positioning can be performed by attaching a magnet without providing the fitting protrusion 21.

A medical knife having two replaceable blade holding structures that individually correspond to two types of replaceable blades of different sizes and / or shapes, with the fingertip addressed to the finger contact surface adjacent to the replaceable blade at the end of the replaceable blade holder It is possible to form a replaceable blade holder in which the replaceable blade protruding from the edge of the fingertip and the edge of the replaceable blade holder does not deviate significantly in the width direction. It is possible to provide an easy-to-use medical knife that can be cut without a sense of incongruity with a sense that it is a part.

  1 replaceable blade holder, 2 one holder part, 3 other holder part, 4 shaft part, 5 recess, 6 partial flange, 7 inner surface of one holder part, 8 hole, 9 shaft hole, 10 partial inner peripheral surface 11 Partially reduced inner peripheral surface, 12 Outer peripheral surface, 13 Inner surface of the other holder part, 14 Blade receiving portion, 15 First surface, 16 Second surface, 17 Third surface, 18 Fourth surface 19 replacement blades, 20 fitting holes, 21 fitting protrusions, 22 positioning plate parts, 23 positioning plate parts, 24 holes, 25 side walls, 26 ridgelines, 27 blade receiving surfaces, 28 outer grooves, 29 inner grooves, 30 narrow groove, 31 small protrusion, 32 receiving hole, 33 notch recess, 34 notch recess, 35 wide spare blade, 36 Sides, 37 one edge, 38 other edge, 39 medical knife, 40 cutting edge 41 fitting hole

Claims (8)

The replaceable blade holder includes a replaceable blade holder and a replaceable blade that can be attached to and detached from the replaceable blade holder. The replaceable blade holder includes a pair of holder parts that can be coupled to each other, and the replaceable blade holding structure provided in each holder part cooperates with one end of the replaceable blade. A medical knife in which the other end of the replaceable blade protrudes from the replaceable blade holder, and the replaceable blade holder is compatible with two types of replaceable blades having different sizes and / or shapes. There are two replaceable blade holding structures corresponding to each replaceable blade, and the replaceable blades held by each replaceable blade holding structure protrude from different positions on the periphery of the replaceable blade holder, A medical knife characterized in that the direction in which the replaceable blade held by one of the replaceable blade holding structures protrudes and the direction in which the replaceable blade held by the other replaceable blade holding structure protrudes are different. The replacement blade is held between the replacement blade holding structures of both holder parts, and the replacement blade can be made detachable by rotating the holder part relative to the rotation axis perpendicular to the inner surface of the holder part. The medical knife according to claim 1, which can be made. The medical knife according to claim 1 or 2, wherein each holder part has substantially the same outer shape. The protruding direction of the replaceable blade held by one replaceable blade holding structure and the protruded direction of the replaceable blade held by the other replaceable blade holding structure are directed in opposite directions. The medical knife according to one item. Each holder part is formed as a long and narrow plate of approximately the same size and overlapped. The replaceable blade holder has edges for projecting replaceable blades of different widths at both ends, and the edges protrude from the edges. The medical knife according to any one of claims 1 to 4, wherein the medical knife has a predetermined edge length corresponding to the width of the replacement blade. The width of the replaceable blade holder is the largest at its center, and the side edges of the replaceable blade holder are closer to each other from the center of the replaceable blade holder to the respective ends, with respect to the longitudinal center line of the replaceable blade holder. The medical knife according to claim 5, wherein a direction in which the cutting edge of the replaceable blade held by the replaceable blade holder extends is the same direction as one of the side edges approaching each other. A cutout recess is formed in one side edge of the replaceable blade holder, and the cutout recess is formed in one holder part. A cutout recess is formed in the other side edge of the replaceable blade holder, and the cutout recess is the other. The medical knife according to claim 5 or 6, wherein the two notch recesses are formed in a portion separated from the rotation axis of the replaceable blade holder by substantially the same distance. The medical knife according to any one of claims 1 to 7, wherein both holder parts can be disassembled.

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