Medical knife

Abstract

To provide a medical knife which suppresses wobble of a blade body.SOLUTION: A medical knife is a tool for holding a blade body by a holder and a cover. The blade body has: a blade edge which extends from a point in plan view and has a tip in at least a part thereof; a back edge extending from the point; and a first edge which extends in a direction having a first angle to the back edge. The holder has a recessed blade body holding recess part which is formed along the shape of the blade body. The blade body holding recess part has a first inclined part which is inclined in a direction perpendicular to the first edge part in plan view on a position where the first edge part contacts, and has a second inclined part which is inclined in a direction perpendicular to the back edge in plan view, on a position where the back edge contacts.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] One aspect of the present invention relates to a medical blade.

Background Art

[0002] Conventionally, there has been a scalpel (medical blade) having a handle, a blade body, and a slider (movable body), in which the handle is held by hand and the slider to which the blade body is attached moves to enable storage of the blade body. In such a scalpel, the handle and the slider are formed of plastic and assembled, but due to the configuration in which the slider moves inside the handle, rattling may occur between the slider and the handle. At this time, since the blade body is attached to the slider, rattling occurs between the handle and the blade body.

[0003] On the other hand, the medical blade described in Patent Document 1 has a configuration including a handle, a blade body, and a movable body having a cover. In this configuration, since the blade body is attached to the handle, even if rattling occurs between the handle and the movable body, the blade body itself does not rattle.

[0004] Also, as another medical knife, there is one described in Patent Document 2.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the medical blade described in Patent Document 1, the blade body was clamped by the blade body overlapping portion of the handle formed of plastic, but rattling sometimes occurred between the resin member and the blade body. More specifically, the two blade body overlapping portions each had a convex portion and a concave portion that were slightly inclined, and the blade body overlapping portions clamped the blade body so that the rear end portion of the blade body was slightly warped, but rattling sometimes occurred in the width direction of the blade body. In particular, for medical blades used for delicate work, blades that can prevent such slight rattling are required.

[0007] Also, among the 17 goals in the SDGs (Sustainable Development Goals, Goals for Sustainable Development) adopted at the United Nations Summit, Goal 3 aims to "ensure health and well-being for all" and includes as a goal ensuring a healthy life and promoting well-being for all people of all ages. Under such circumstances, it is required to supply safer and easier-to-use instruments for those used in the medical field.

Means for Solving the Problems

[0008] In order to solve the above problems, the present invention provides, for example, the following means.

[0009] A medical blade according to one aspect of the present invention is a medical blade that clamps a blade body with a holder and a cover, The blade body, in plan view, has a blade edge extending from the cutting edge and having a blade tip at least in part, a back edge extending from the cutting edge, and a first edge portion extending in a direction having a first angle with respect to the back edge, The holder has a concave blade body holding recess formed along the shape of the blade body, The blade body holding recess has a first inclined portion that inclines in a direction perpendicular to the first edge portion in plan view at a position where the first edge portion abuts, At the position where the back edge abuts, it has a second inclined portion that inclines in a direction perpendicular to the back edge in a plan view. It is a medical blade.

[0010] According to the above medical blade, since the blade body is sandwiched between the holder and the cover while being curved in the thickness direction by the first inclined portion and the second inclined portion of the blade body holding recess of the holder, it has a relatively simple structure and can be configured to prevent rattling in the longitudinal direction, width direction, and rotational direction of the blade body. Thereby, a medical blade that can accurately incise a targeted site can be provided. By using such a medical blade, a safe and easy-to-use instrument can be provided, contributing to Goal 3 of the SDGs, "Ensure healthy lives and promote well-being for all."

[0011] In the above medical blade, preferably, the blade body further has a second edge portion that extends in a direction having a second angle with respect to the back edge from an end portion of the back edge on the side opposite to the cutting edge in a plan view. The first edge portion extends in a direction having a third angle with respect to the second edge portion from the second edge portion toward the blade edge in a plan view.

[0012] According to the above medical blade, the back edge and the first edge portion connected to the second edge portion continuing from the back edge are respectively provided with the second inclined portion and the first inclined portion, and the blade body can be more stably sandwiched between the holder and the cover.

[0013] In the above medical blade, preferably, the third angle is 90°.

[0014] In the above medical blade, preferably, the blade body has an elongated hole shape extending parallel to the extending direction of the back edge and has a through hole formed in the thickness direction. The holder has a convex blade body insertion portion inserted into the through hole. The through hole is formed so as to intersect a straight line connecting the central portion in the extending direction of the first inclined portion and the central portion in the extending direction of the second inclined portion in a plan view.

[0015] According to the above-mentioned medical blade, a straight line connecting the central part in the extending direction of the first inclined part and the central part in the extending direction of the second inclined part intersects the through-hole through which the blade insertion part is inserted. Thereby, the blade can be held more stably with respect to the holder, and rattling of the blade can be prevented more effectively.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

DETAILED DESCRIPTION OF THE INVENTION

[0017] A medical blade according to an embodiment of the present invention will be specifically described with reference to the drawings. The medical blade of the present invention is a so-called medical scalpel. The embodiments described below are merely examples of the present invention and do not limit the technical scope of the present invention in a restrictive manner. In each drawing, the same reference numerals are assigned to the same components, and redundant descriptions are omitted.

[0018] FIGS. 1 to 5 are perspective views of a medical blade 1 as seen from a first direction. FIG. 1 shows a state in which the blade body 4 is covered by the slider 5, FIG. 2 shows a state in which the slider 5 is moved to expose the blade body, FIG. 3 shows a state in which the slider 5 is removed, and FIG. 4 shows a state in which the cover 3 is further removed. That is, FIG. 4 is a perspective view of the holder 2 and the blade body 4 of the medical blade 1. FIG. 5 is an enlarged view of the medical blade 1 with the slider 5, the cover 3, and the blade body 4 removed and only the holder 2 left. FIG. 6 is an enlarged perspective view of the holder 2 shown in FIG. 5 as seen from a second direction different from the first direction. FIG. 7 is a perspective view of the medical blade 1 as seen from the second direction.

[0019] Figs. 8 to 11 are perspective views of the medical tool 1 as seen from a third direction. Fig. 8 shows a state where the blade body 4 is covered by the slider 5, Fig. 9 shows a state where the slider 5 is removed, Fig. 10 shows a state where the holder 2 is further removed, and Fig. 11 shows a state where the blade body 4 is further removed. That is, Fig. 11 is a view showing the cover 3 of the medical tool 1. Figs. 12 to 14 are side views of the medical tool 1. Fig. 12 shows a state where the blade body 4 is covered by the slider 5, Fig. 13 shows a state where the slider 5 is moved and the blade body 4 is exposed, and Fig. 14 shows a state where the slider 5 is removed.

[0020] In this specification, the state in which the holder 2, the cover 3, the blade body 4, and the slider 5 are connected may be referred to as a connected state or an assembled state.

[0021] In the drawings, the X-axis, the Y-axis, and the Z-axis are shown. The direction in which the blade body 4 extends is the X-axis direction, the thickness direction of the medical tool 1 is the Z-axis direction, and the X-axis, the Y-axis, and the Z-axis are directions that intersect perpendicularly to each other.

[0022] As shown in each figure, the medical tool 1 of this embodiment includes a holder 2, a cover 3, a blade body 4, and a slider 5. The holder 2, the cover 3, and the slider 5 are made of resin, and the blade body 4 is made of metal. The medical tool 1 sandwiches the blade body 4 between the holder 2 and the cover 3 (see Figs. 3, 9, 14, etc.). The slider 5 is slidably attached to the connected holder 2 and cover 3. By sliding the slider 5, the medical tool 1 changes its state between a storage state (see Fig. 1) in which the blade body 4 is covered so as not to be exposed by the slider 5 and a use state (see Fig. 2) in which the blade body 4 is exposed.

[0023] [Blade body 4] FIG. 15 is an enlarged plan view of the blade body 4 placed on the holder 2. The blade body 4 is formed of a plate-shaped metal and has a blade tip polished as detailed below. The blade body 4 has a blade edge 42 extending from the cutting tip 41, a back edge 43 extending from the cutting tip 41, a second edge portion 44 extending from the back edge 43, and a first edge portion 45 extending from the second edge portion 44 toward the blade edge 42. In a plan view, the blade body 4 is formed with these blade edge 42, back edge 43, second edge portion 44, and first edge portion 45 as outer edges.

[0024] The blade edge 42 extends from the cutting tip 41 and has a blade tip polished at least partially. The blade edge 42 consists of a curved blade edge 42a, a straight blade edge 42b, and a notch 42c. A blade tip is formed over the entire curved blade edge 42a and up to a position in the middle of the straight blade edge 42b. The curved blade edge 42a is curved convexly outward. The straight blade edge 42b is linear, and the notch 42c is notched in a shape that curves inward in a substantially arc shape from a straight line that is an extension of the straight blade edge 42b. In this embodiment, as described above, the entire curved blade edge 42a and a part of the straight blade edge 42b form the blade tip, but the location where the blade tip is formed may be changed.

[0025] The back edge 43 extends from the cutting tip 41 and consists of a curved back edge 43a and a straight back edge 43b. The curved back edge 43a is gently curved, the straight back edge 43b extends linearly, and it can be said that the back edge 43 is substantially linear. Near the center of the back edge 43, there is an inclined contact portion 43c that contacts the second inclined portion 25c of the holder 2 in the connected state where the blade body 4 is sandwiched between the holder 2 and the cover 3.

[0026] From the end (corner) 43d on the side opposite to the cutting tip 41 of the back edge 43, the second edge portion 44 extends toward the side of the blade edge 42. The second edge portion 44 is linear. The angle θ1 formed by the straight back edge 43b, which is the linear portion of the back edge 43, and the second edge portion 44 is 120°.

[0027] From the end (corner) 44a on the side opposite to the end (corner) 43d, which is the connection part of the second edge part 44 with the back edge 43, the first edge part 45 extends toward the cutting edge 41 side of the cutting tip 41. The first edge part 45 is linear. The angle θ2 formed by the second edge part 44 and the first edge part 45 is 90°, that is, a right angle. The angle formed by the extension line of the back edge 43 and the extension line of the first edge part 45 is 30° (= θ1 + θ2 - 180°).

[0028] The blade body 4 has a through hole 46 formed so as to penetrate in the thickness direction on the inner side in plan view. The through hole 46 extends in an elongated hole shape parallel to the X direction, which is the direction in which the back edge 43 extends. More specifically, the through hole 46 changes in length in the Y-axis direction, which is the width direction, in the order of a first width part 46a, a second width part 46b, and a third width part 46c from the side of the cutting tip 41. The length of the width is such that the first width part 46a < the second width part 46b < the third width part 46c.

[0029] [Holder 2] The holder 2 is a member connected by fitting with the cover 3, and in the connected state with the cover 3 and the blade body 4, it sandwiches the blade body 4 together with the cover 3. The holder 2 has a gripping part 21 that is gripped by the user. The end of the gripping part 21 on the side opposite to the blade body 4 in the longitudinal direction has a tapered shape that narrows in the width direction toward the tip.

[0030] As shown in FIGS. 4 and 5 etc., the holder 2 has a convex blade insertion part 22 that is inserted into the through hole 46 of the blade body 4 and the through hole 31 of the cover 3 in the connected state (see FIG. 10). The blade insertion part 22 has a shape along the through hole 46 and the through hole 31. That is, the blade insertion part 22 has a first width part 22a, a second width part 22b, and a third width part 22c corresponding to the first width part 46a, the second width part 46b, and the third width part 46c of the through hole 46. The lengths of these widths are such that the first width part 22a < the second width part 22b < the third width part 22c.

[0031] The holder 2 has recesses 22d, 22e, and 22f that are recessed in the width direction (Y-axis direction) at the base of the blade body insertion portion 22. The recesses 22e and 22f are formed on opposite sides in the Y-axis direction. These recesses 22d, 22e, and 22f are provided at positions corresponding to the convex portions 31d, 31e, and 31f of the cover 3. In the connected state, the convex portions 31d, 31e, and 31f are respectively inserted into the recesses 22d, 22e, and 22f, and the holder 2 and the cover 3 are fitted together.

[0032] The holder 2 has a concave blade body holding recess 25 formed along the shape of the blade body 4. The blade body holding recess 25 is formed at a position facing the cover 3 and is formed as a surface (a surface located on the -Z axis side) that is one step lower than the cover facing surface 26 that faces the cover 3 without passing through the blade body 4. The cover facing surface 26 is planar along the XY plane. The tip side (X-axis + side) of the holder 2 of the blade body holding recess 25 has the same shape as the cover tip portion 3a of the cover 3 in plan view.

[0033] As shown in FIGS. 5 and 6, the blade body holding recess 25 has a first inclined portion 25a at a position where the first edge portion 45 of the blade body 4 abuts in the connected state. The first inclined portion 25a is inclined so as to be recessed as it goes inward from the edge 25b. In other words, it is inclined in a direction perpendicular to the extending direction of the first edge portion 45 of the blade body 4 in plan view. Thereby, in the connected state, the first edge portion 45 of the blade body 4 is in a state of abutting against the inclined surface of the first inclined portion 25a.

[0034] As shown in FIG. 6, the blade body holding recess 25 has a second inclined portion 25c at a position where the straight back edge 43b of the blade body 4 abuts in the connected state. The second inclined portion 25c is inclined so as to be recessed as it goes inward from the edge 25d. In other words, it is inclined in a direction perpendicular to the extending direction of the straight back edge 43b of the blade body 4 in plan view. Thereby, in the connected state, a part of the straight back edge 43b of the blade body 4 is in a state of abutting against the inclined surface of the second inclined portion 25c.

[0035] As shown in the side views of FIGS. 5, 6, and 14, the blade body holding recess 25 has a third inclined portion 25e at a position continuous from the first inclined portion 25a. The third inclined portion 25e is inclined along the longitudinal direction (X-axis direction) of the holder 2. More specifically, the third inclined portion 25e is inclined toward the +Z side as it goes toward the -X side.

[0036] As shown in FIGS. 5 and 6 and the like, the holder 2 has connecting hole portions 23a, 23b, 23c, and 23d. The connecting hole portion 23d is a rectangular through-hole extending in the longitudinal direction (X-axis direction). The connecting hole portions 23a, 23b, and 23c are provided at positions corresponding to the connecting convex portions 32a, 32b, and 32c of the cover 3. In the connected state, the connecting convex portions 32a, 32b, 32c, and 32d of the cover 3 are inserted into the connecting hole portions 23a, 23b, 23c, and 23d, and the holder 2 and the cover 3 are fitted together.

[0037] The periphery of the position where the connecting hole portion 23b is formed is a cover facing inclined surface 26a facing the inclined edge portion 35a of the cover 3, and is inclined toward the cover 3 side (+Z side) as it goes toward the edge.

[0038] The holder 2 has a circular through-hole 25s in plan view near the center of the third inclined portion 25e of the blade body holding recess 25. In the connected state, the blade body 4 is visible from the through-hole 25s. Characters or symbols indicating the type of the blade body 4 are shown at positions visible from the through-hole 25s of the blade body 4.

[0039] As shown in FIGS. 8 and 9, the holder 2 has two finger abutting portions 27a and 27b extending in the longitudinal direction on the surface on the side opposite to the side facing the cover 3 (the surface located on the -Z side). The finger abutting portions 27a and 27b are each convex and extend in the longitudinal direction, and are provided side by side with a space in the width direction. The holder 2 has a convex finger abutting portion 27c extending in the longitudinal direction on the surface located on the +Y side (see FIG. 6). The finger abutting portions 27a, 27b, and 27c have irregularities formed in a wave shape in the longitudinal direction. Due to these irregularities, it is difficult for the fingers placed on the finger abutting portions 27a, 27b, and 27c to slip during use.

[0040] As shown in FIGS. 12 and 13, when viewed from the side, the finger contact portion 27a has notches 27d and 27e that are recessed toward the Z-axis side.

[0041] [Cover 3] The cover 3 is a member that is connected to the holder 2 by fitting, and sandwiches the blade body 4 together with the holder 2 in a connected state with the holder 2 and the blade body 4. The cover tip portion 3a, which is the tip side of the cover 3, has the same shape as the holder tip portion 2a located on the tip side (X-axis + side) of the blade body holding recess 25 of the holder 2 in a plan view (see FIGS. 11, 5, and 3, etc.).

[0042] As shown in FIGS. 10 and 11, the cover 3 has a through hole 31 through which the blade body insertion portion 22 of the holder 2 is inserted in the connected state. This through hole 31 has the same elongated hole shape as the through hole 46 of the blade body 4, and the width (length in the Y-axis direction) changes in the longitudinal direction. Specifically, the through hole 31 has a first width portion 31a, a second width portion 31b, and a third width portion 31c corresponding to the first width portion 46a, the second width portion 46b, and the third width portion 46c of the through hole 46 of the blade body 4. The lengths of these widths are such that the first width portion 31a < the second width portion 31b < the third width portion 31c. On the bottom of the through hole 31 on the side facing the holder 2, convex portions 31d, 31e, and 31f that protrude in the width direction are formed (see FIG. 11). These convex portions 31d, 31e, and 31f are provided at positions corresponding to the recesses 22d, 22e, and 22f of the holder 2 (see FIGS. 5 and 6), respectively.

[0043] As shown in FIG. 11, the cover 3 has a curved blade body holding recess 34 formed at a position facing the first inclined portion 25a and the third inclined portion 25e of the holder 2. The curved blade body holding recess 34 is inclined along the first inclined portion 25a and the third inclined portion 25e of the opposing holder 2, and has a shape that is partially recessed with respect to the planar holder facing surface 35 along the XY plane. The curved blade body holding recess 34 has edges 34a, 34b, and 34c along the second edge portion 44, the first edge portion 45, and the notch portion 42c of the blade body 4.

[0044] As shown in FIGS. 10 and 11, the cover 3 has connecting convex portions 32a, 32b, 32c, and 32d, and a hole portion 33. The hole portion 33 is a rectangular through-hole extending in the longitudinal direction (X-axis direction). The connecting convex portion 32d is provided adjacent to the hole portion 33 and is a rectangular convex portion extending in the longitudinal direction (X-axis direction) similar to the hole portion 33. The connecting convex portions 32a, 32b, and 32c are provided at positions corresponding to the connecting hole portions 23a, 23b, and 23c (see FIG. 4) of the holder 2. The connecting convex portion 32d is provided at a position corresponding to the connecting hole portion 23d of the holder 2. In the connected state, the connecting convex portions 32a, 32b, 32c, and 32d are inserted into the connecting hole portions 23a, 23b, 23c, and 23d of the holder 2, respectively, and the holder 2 and the cover 3 are fitted together. The tip of the connecting convex portion 32b is hook-shaped, and this hook-shaped portion engages with the connecting hole portion 23b of the holder 2 so that the connecting convex portion 32b does not come out of the connecting hole portion 23b.

[0045] The periphery of the position where the connecting convex portion 32b is formed is an inclined edge portion 35a that faces the cover-facing inclined surface 26a of the holder 2. The inclined edge portion 35a is inclined along the cover-facing inclined surface 26a of the holder 2. Specifically, the inclined edge portion 35a is an inclined surface that faces in the direction (Z-axis + side) away from the holder-facing surface 35 as it approaches the edge.

[0046] As shown in FIGS. 1 to 3, the cover 3 has two finger contact portions 37a and 37b that extend in the longitudinal direction on the surface (the surface located on the Z-axis + side) opposite to the side facing the holder 2. Similar to the finger contact portions 27a and 27b of the holder 2, the finger contact portions 37a and 37b are convex shapes that extend in the longitudinal direction and are provided side by side with a space in the width direction. The finger contact portions 37a and 37b have irregularities formed in a wavy shape in the longitudinal direction.

[0047] As shown in FIGS. 12 and 13, when viewed from the side, the finger contact portion 37a has notches 37d and 37e formed to be recessed on the Z-axis + side.

[0048] FIG. 16 is a plan view of the medical blade 1 with the slider 5 removed. FIG. 17 is a cross-sectional view taken at the position A-A in FIG. 16. In FIG. 15, A-A is indicated at the same position as the position A-A in FIG. 16. The blade body 4 is sandwiched between the holder 2 and the cover 3 in a state of being curved in the thickness direction with the straight line B forming this A-A as the center line of the curve.

[0049] As shown in FIG. 17 which is a cross-sectional view and FIG. 15 which is a plan view, the first edge portion 45 of the blade body 4 is sandwiched between the first inclined portion 25a of the holder 2 and the curved blade body holding recess 34 of the cover 3. More specifically, the first edge portion 45 of the blade body 4 abuts against the first inclined portion 25a of the holder 2 and is curved toward the cover 3 side (Z-axis - side) by stress.

[0050] As shown in FIG. 17 which is a cross-sectional view and FIG. 15 which is a plan view, the inclined contact portion 43c located near the center of the back edge 43 of the blade body 4 is sandwiched between the second inclined portion 25c of the holder 2 and the cover tip portion 3a of the cover 3. More specifically, the inclined contact portion 43c of the blade body 4 abuts against the second inclined portion 25c of the holder 2 and is curved toward the cover 3 side (Z-axis - side) by stress.

[0051] As shown in FIG. 17 which is a cross-sectional view and FIG. 14 which is a side view, in the connected state, the blade body 4 is curved in the thickness direction so as to be convex toward the holder 2 side (convex toward the Z-axis - side) along the straight line B connecting the central portion 25t in the extending direction of the first inclined portion 25a of the holder 2 and the central portion 25u in the extending direction of the second inclined portion 25c. In other words, the straight line B indicating the direction (second direction) in which the blade body 4 is curved in the thickness direction is a straight line connecting the central portion of the first edge portion 45 of the blade body 4 and the central portion in the extending direction of the inclined contact portion 43c. The straight line B is a straight line having a predetermined angle (30°) with respect to the X-axis which is the longitudinal direction of the medical blade 1 due to the positional relationship in which the first inclined portion 25a and the second inclined portion 25c are arranged. This straight line B intersects the through hole 46 of the blade body 4.

[0052] [Slider 5] As shown in FIGS. 1 and 2 and the like, the slider 5 is attached to the connected holder 2, cover 3, and blade body 4 and is slidable in the longitudinal direction (X-axis direction). The slider 5 has two elongated holes 51a and 51b extending in the longitudinal direction on the surface located on the + side of the Z-axis as shown in FIGS. 1 and 2, and two elongated holes 52a and 52b extending in the longitudinal direction on the surface located on the - side of the Z-axis as shown in FIG. 8. The finger contact portions 37a and 37b of the cover 3 are inserted into the elongated holes 51a and 51b, and the finger contact portions 27a and 27b of the holder 2 are inserted into the elongated holes 52a and 52b. As shown in FIGS. 1, 2, 8, and 12 and the like, the slider 5 has a side frame 53 formed by being sandwiched between the elongated holes 51a and 52a on the surface located on the - side of the Y-axis. A knob 53a is formed near the center in the longitudinal direction of the side frame 53. As shown in FIG. 7, the slider 5 has an elongated hole 54 on the surface located on the + side of the Y-axis. The finger contact portion 27c of the holder 2 is inserted into the elongated hole 54.

[0053] The side frame 53 of the slider 5 has convex portions 53b and 53c that protrude outward, that is, on the + side and - side of the Z-axis, respectively, in both width directions at positions on the + side of the X-axis close to the knob 53a. The convex portions 53b and 53c are formed at positions facing each other. In the stored state where the slider 5 covers the blade body 4 (see FIGS. 12 and 1 and the like), the convex portions 53b and 53c engage with the concave portions 37d and 27d, respectively. In the use state where the slider 5 moves from the stored state to expose the blade body 4 (see FIGS. 13 and 2 and the like), the convex portions 53b and 53c engage with the concave portions 37e and 27e, respectively.

[0054] The slider 5 has a through hole 5a through which the blade body 4 can be inserted during sliding (see FIG. 7).

[0055] [Use of the medical blade 1] When changing the medical blade 1 from the stored state to the used state, the user slides the slider 5 in the -X axis direction while pinching and pulling up the knob 53a of the slider 5 with a finger. At this time, the engagement between the convex portions 53b and 53c of the slider 5 and the concave portions 37d and 27d is released, and the slider 5 becomes slidable. When the slider 5 is moved in the -X axis direction, the convex portions 53b and 53c of the slider 5 engage with the concave portions 37e and 27e, and the further movement of the slider 5 in the -X axis direction is restricted. As a result, the medical blade 1 is in the used state where the blade body 4 is exposed (see FIG. 2). Note that the movement restriction of the slider 5 is performed not only by the engagement between the convex portions 53b and 53c and the concave portions 37e and 27e, but also by the longitudinal edges of the finger contact portions 27a, 27b, 37a, and 37b coming into contact with the edges of the long holes 52a, 52b, 51a, and 51b, respectively.

[0056] When using the medical blade 1 in the used state, for example, the user grips the vicinity of the finger contact portions 27a, 27b, 27c, 37a, and 37b with the thumb and index finger. At this time, the middle finger, ring finger, and little finger grip the gripping portion 21 to stabilize the medical blade 1 so that it does not rattle. Note that the way of holding the medical blade 1 may vary depending on the user and the usage situation.

[0057] [Modification Example] The medical blade 1 of the present invention is not limited to the shape described in the above embodiment, and a part thereof may be deformed without departing from the gist of the invention with respect to the shape of the embodiment.

[0058] The angles θ1 and θ2 of the blade body 4 may be arbitrarily changed. That is, the angle θ1 is not limited to 120°, and the angle θ2 is not limited to 90° (right angle). In this case, the angle formed by the extension line of the back edge 43 and the extension line of the first edge 45 is also not limited to 30°. However, in order to arrange the positions of the first inclined portion 25a and the second inclined portion 25c so that the blade body 4 can be stably clamped, the angle formed by the extension line of the back edge 43 and the extension line of the first edge 45 is preferably 10° or more and 80° or less, and it is preferable to determine the angles of θ1 and θ2 so that the angle formed by the extension line of the back edge 43 and the extension line of the first edge 45 becomes the above angle. In addition, when the angles shown in the embodiment are used, it is preferable because the shape of the end portion on the side opposite to the cutting edge 41 of the blade body 4 can be made relatively compact, and the second direction, which is the bending direction of the blade body 4, can be set in an appropriate direction. Further, even in a configuration where the angle formed by the extension line of the back edge 43 and the extension line of the first edge 45 is 10° or more and 80° or less as described above, the first inclined portion 25a extends in a direction different from the direction in which the second inclined surface 25c extends, and the blade body 4 can be pressed so as to bend in two different directions. Thereby, rattling of the blade body 4 can be effectively prevented.

[0059] In the blade body 4, although the cutting edge 42 and the back edge 43 are each shaped such that a part thereof is curved, at least one of the cutting edge 42 and the back edge 43 may be linear.

[0060] The blade body 4 may not necessarily have the second edge 44, or may be configured such that the first edge 45 connects the back edge 43 and the cutting edge 42. Further, in addition to the first edge 45 and the second edge 44, a configuration having additional edges may be used. Even in such a case, if the positional relationship between the blade body 4, the first inclined portion 25a, and the second inclined portion 25c is appropriate, a configuration in which the blade body 4 can be stably clamped can be achieved.

[0061] [Features of the medical blade 1] The medical blade 1 is configured to hold the blade body 4 with a holder 2 and a cover 3. The holder 2 and the cover 3 are configured to bend and sandwich the blade body 4 in the thickness direction (Z-axis direction) along a bending direction having a predetermined angle with respect to the X-axis direction, which is the direction in which the back edge 43 of the blade body 4 extends in a plan view and intersects the X-axis direction.

[0062] According to such a medical blade 1, the holder 2 and the cover 3 bend and sandwich the blade body 4 in the thickness direction (Z-axis direction) along a bending direction having a predetermined angle with respect to the back edge 43 of the blade body 4, rather than being parallel to the back edge 43. Therefore, it is possible to prevent the blade body 4 from being warped not only in the longitudinal direction of the blade body 4 but also in the width direction of the blade body 4 at the same time. Thereby, it is possible to provide the medical blade 1 that can accurately incise the targeted site.

[0063] Further, in the medical blade 1, the blade body 4 has an elongated hole shape extending parallel to the X-axis direction in which the back edge 43 extends, and has a through hole 46 formed in the thickness direction (Z-axis direction). The holder 2 has a convex blade insertion portion 22 to be inserted into the through hole 46. The through hole 46 of the blade body 4 is formed so as to intersect the second direction in which the blade body 4 bends. As a result, since the bending direction of the blade body 4 and the through hole 46 through which the blade insertion portion 22 is inserted intersect, the blade body 4 can be held more stably with respect to the holder 2 and the cover 3. Thereby, it is possible to provide the medical blade 1 that more effectively prevents the blade body 4 from rattling.

[0064] In the medical blade 1, in plan view, the blade body 4 includes a cutting edge 42, a back edge 43, and a first edge portion 45 on its outer edge. The cutting edge 42 extends from the cutting tip 41 and is a portion having a cutting edge at least partially. The back edge 43 is a portion extending from the cutting tip 41. The first edge portion 45 extends in a direction having a first angle (for example, 30°) with respect to the back edge 43. The holder 2 has a concave blade body holding recess 25 formed along the shape of the blade body 4. This blade body holding recess 25 has a first inclined portion 25a and a second inclined portion 25c. The first inclined portion 25a is inclined in a direction perpendicular to the first edge portion 45 in plan view at the position where the first edge portion 45 abuts. The second inclined portion 25c is inclined in a direction perpendicular to the back edge 43 in plan view at the position where the back edge 43 abuts. Since the medical blade 1 is configured to bend the blade body 4 in the thickness direction by the first inclined portion 25a and the second inclined portion 25c of the blade body holding recess 25 in this way, it has a relatively simple configuration and can prevent rattling in the longitudinal direction, width direction, and rotational direction of the blade body. Therefore, it becomes a medical blade that can accurately incise the targeted site.

[0065] Also, in the medical blade 1, in plan view, the blade body 4 has a second edge portion 44 that extends from an end portion 43d of the back edge 43 on the side opposite to the cutting tip 41 in a direction having a second angle (for example, 120°) with respect to the back edge 43. The first edge portion 45 extends in a direction having a third angle (for example, 90°) with respect to the second edge portion 45 from the second edge portion 44 toward the cutting edge 42 in plan view. With such a configuration, the second inclined portion 25c and the first inclined portion 25a are respectively provided on the back edge 43 and the first edge portion 45 connected to the second edge portion 44 continuing from the back edge 43, and it becomes a configuration in which the blade body 4 can be more stably clamped by the holder 2 and the cover 3.

[0066] Also, in the medical blade 1, the through hole 46 of the blade body 4 is formed so as to intersect a straight line B connecting the central portion in the extending direction of the first inclined portion 25a and the central portion in the extending direction of the second inclined portion 25c in plan view. According to such a medical blade 1, the blade body 4 can be held more stably with respect to the holder 2 and the cover 3, and a configuration capable of more effectively preventing rattling of the blade body 4 can be achieved.

Description of Symbols

[0067] 1…Medical blade 2…Holder 2a…Holder tip 21…Grip part 22…Blade body insertion part 22d, 22e…Recesses 23a, 23b, 23c, 23d…Connection hole parts 25…Blade body holding recess 25a…First inclined part 25c…Second inclined part 25e…Third inclined part 25s…Through hole 26…Cover facing surface 26a…Cover facing inclined surface 27a, 27b, 27c…Finger contact parts 3…Cover 3a…Cover tip 31…Through hole 31d, 31e…Protrusions 32a, 32b, 32c, 32d…Connection protrusions 33…Hole part 34…Curved blade body holding recess 34a, 34b…Edges 35…Holder facing surface 35a…Inclined edge 37a…Finger contact part 37d…Recess 37e…Recess 4…Blade body 41…Cutting edge 42…Blade edge 42a…Curved blade edge 42b…Straight blade edge 42c…Notch 43…Back edge 43a…Curved back edge 43b…Straight back edge 43c…Inclined contact part 44…Second edge 45…First edge 46…Through hole 5…Slider 5a…Through hole 51a, 51b, 52a, 52b, 54... elongated holes 53... side frame 53a... knob 53b, 53c... convex portions

Claims

1. A medical blade that sandwiches a blade body between a holder and a cover, wherein the blade body, in plan view, has a blade edge that extends from the cutting edge and has a cutting edge at least in part, a back edge that extends from the cutting edge, and a first edge portion that extends in a direction having a first angle with respect to the back edge, the holder has a concave blade body holding recess formed along the shape of the blade body, the blade body holding recess, at a position where the first edge portion abuts, has a first inclined portion that inclines in a direction perpendicular to the first edge portion in plan view, and at a position where the back edge abuts, has a second inclined portion that inclines in a direction perpendicular to the back edge in plan view, a medical blade.

2. the blade body further has, in plan view, a second edge portion that extends from an end portion of the back edge on the side opposite to the cutting edge in a direction having a second angle with respect to the back edge, the first edge portion extends in a direction having a third angle with respect to the second edge portion from the second edge portion toward the blade edge in plan view, the medical blade according to Claim 1.

3. wherein the third angle is 90°, the medical blade according to Claim 2.

4. the blade body has an elongated hole shape that extends parallel to the extending direction of the back edge and has a through hole formed in the thickness direction, the holder has a convex blade body insertion portion that is inserted into the through hole, the through hole is formed so as to intersect a straight line connecting a central portion in the extending direction of the first inclined portion and a central portion in the extending direction of the second inclined portion in plan view, the medical blade according to Claim 1.

Images