Medical instrument

Abstract

To facilitate string fastening operation using an instrument in a surgical operation.SOLUTION: The medical instrument comprises a pair of arms respectively provided with surfaces facing each other to be able to insert and hold an object with the opposite surfaces at the tips of the arms. On the outer surfaces as peripheral surface other than the opposite surfaces at the tips, grooves are formed along a lateral direction orthogonal to the longitudinal direction of the arms.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to medical devices. [Background technology]

[0002] 2. Description of the Related Art There is known a medical instrument for gripping a suture needle and for gripping and fixing biological tissue when suturing biological tissue in a surgical operation (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-102719 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a surgical procedure, after suturing tissue with a suture needle with a suture thread, the suture thread is pulled to tighten it, which is called thread tightening. The thread tightening operation removes slack in the thread, allowing the desired suture state to be obtained, enabling faster and neater closure. Some surgeons perform the thread tightening operation by holding an instrument such as a pliers used for suturing in their hand, hooking the thread onto the instrument, and pulling the thread.

[0005] However, when the thread is hooked onto the tool, the thread may slip off the surface of the tool and come off, making it necessary to re-hook and re-tension the thread, which may result in a longer thread tightening operation.

[0006] Therefore, an object of one aspect of the present invention is to facilitate suture tightening operations using instruments in surgical operations. [Means for solving the problem]

[0007] In order to solve the above problems, one aspect of the present invention is a medical instrument having a pair of arms each with opposing surfaces facing each other, and capable of clamping an object between the opposing surfaces of the tips of the arms, wherein a groove is formed in the outer peripheral surface, which is the peripheral surface other than the opposing surfaces of the tips, along a horizontal direction perpendicular to the longitudinal direction of the arms. Effect of the Invention

[0008] According to one aspect of the present invention, suture tightening operation using an instrument can be easily performed in a surgical operation. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view of a pick according to an embodiment of the present invention. [Diagram 2] FIG. 13 is a diagram showing an example of a method for using grooves. [Diagram 3] 2 is a partial plan view of one arm portion in FIG. 1 as viewed from the side. [Figure 4] 2 is a partial plan view of one arm portion in FIG. 1 as viewed from the outer surface. [Diagram 5] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 6] 5 is a cross-sectional view taken along line BB in FIG. 4. [Figure 7] 7 is a cross-sectional view of an arm portion having a groove according to a modified example, corresponding to FIG. 6; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Fig. 1 shows a perspective view of a medical instrument 100 according to an embodiment of the present invention. Fig. 1 shows an example of a clamping tool for surgical operations, specifically a clamp, as the medical instrument 100. In this specification, a "clamping tool for surgical operations" is an instrument that has a function of clamping an object in a surgical operation. Here, the object may be an instrument or object used in surgery, such as a suture needle, suture thread, or material such as gauze, or human tissue such as an internal organ, muscle, or blood vessel.

[0011] As shown in FIG. 1, the medical instrument 100 has a pair of long arms 10. Each of the arms 10 is a generally plate-like piece (a shape in which the thickness dimension is smaller than the length and width dimensions), and is arranged symmetrically with the inner surfaces (also called opposing surfaces) F1 of the arms 10 facing each other. The arms 10 are joined to each other at the base end side of the arms 10 (the base end side of the medical instrument 100) to form a joint R3, whereas the arms 10 can move toward and away from each other at the tip side. Furthermore, the arms 10 may have a tip portion R1, which is a portion extending from the tip edge to a predetermined length, and a central portion R2, which extends from the tip portion R1 to the base end side for a predetermined length. The tip portion R1 is a portion that holds an object, and the central portion R2 is a portion that directly receives an external force when an external force is applied. The arms 10 can be moved closer to and farther apart by an external force applied to the central portion R2. In the example shown in Fig. 1, a user can hold the central portion R2 and push the arms 10 to move closer to each other.

[0012] In this specification, the longitudinal direction of the tip R1 of the arm 10 is L, the width direction perpendicular to the longitudinal direction L is W, and the thickness direction perpendicular to the longitudinal direction L and the width direction W is D (FIG. 1). In the form shown in FIG. 1, the arm 10 is generally plate-shaped even at the tip R1, that is, the thickness (length in the thickness direction D) is smaller than the width (length in the width direction W). However, the arm 10 may have a shape in which the thickness (length in the thickness direction D) is equal to the width (length in the width direction W) or larger than the width (length in the width direction W).

[0013] The material constituting the medical device 100 is not limited, and may be metal, resin, etc. Examples of metals include stainless steel and titanium. Examples of resins include polyethylene, polypropylene, polycarbonate, engineering plastics, etc. From the viewpoint of being able to reliably perform the thread tightening operation (described in more detail later), a metal device is preferable. Also, from the viewpoints of being inexpensive to manufacture and easy to mold, a resin device is preferable.

[0014] In this specification, the surfaces of the periphery of the arm portion 10 other than the inner surface F1 are referred to as the outer peripheral surface F2. When the arms 10, 10 are brought close to each other and closed, the inner surface F1 is hidden and the outer peripheral surface F2 of the arm portion 10 is exposed to the outside. The outer peripheral surface F2 also includes an outer surface F2e located opposite the inner surface (opposing surface) F1, and side surfaces F2s, F2s that extend on both sides of the outer surface F2e and are transitional surfaces between the outer surface F2e and the inner surface F1.

[0015] 1, grooves 5a, 5b, ... (collectively referred to as grooves 5) are formed on the peripheral surface of the tip portion R1 of the arm portion 10 of the medical instrument 100 along a direction perpendicular to the longitudinal direction L of the arm portion 10. More specifically, the grooves 5a, 5b, ... are formed on the outer peripheral surface F2 of the peripheral surface of the tip portion R1 of the arm portion 10. In this specification, "along a predetermined direction" includes not only a direction completely parallel to the predetermined direction, but also a direction deviating from the predetermined direction by 10° or less, preferably 5° or less.

[0016] The groove 5 formed on the outer peripheral surface F2 of the tip R1 of the arm 10 as shown in FIG. 1 provides the following advantages during surgery. When suturing tissues (organs, muscles, skin, blood vessels, etc.) during surgery, a suture needle and a suture are usually used to sew the tissue, and then the suture is pulled and tightened, which is called thread tightening. The thread tightening operation is important for making the wound surface more closely attached after the tissue is sewn. By appropriately performing the thread tightening operation, in the case of a single ligation, which is a so-called one-time knot, the ligation can be performed firmly and reliably. In addition, in the case of continuous suture, it is possible to prevent loosening during suturing, which would cause the wound surface to lose its adhesion. In the case of continuous suture, the thread tightening may be performed for each stitch, may be performed after the tissue has been sewn multiple times, or may be performed during or immediately before the thread tying (ligation). Such thread tightening operation may be performed with both hands or one hand after temporarily releasing the medical instrument (pliers, forceps, etc.) used for suturing, but some surgeons (users of medical instruments) may continue to hold the instrument used for suturing in their hands and perform thread tightening by hooking the looped thread around the instrument and pulling the thread. If the thread slips off the surface of the medical instrument when the thread is hooked around the medical instrument, it may be necessary to redo the hooking and pulling of the thread, resulting in a loss of time. In addition, the impact of the thread slipping off the surface of the instrument may affect the suture state of the tissue. In contrast, as in this embodiment, a groove 5 (FIG. 1) is formed on the outer peripheral surface F2 of the tip R1 of the arm 10 of the medical instrument 100, which prevents the thread from coming off the instrument and allows the thread tightening operation to be performed more reliably. For example, as shown in FIG. 2, the surgeon inserts the tip R1 of the medical instrument (pliers) 100 held in his right hand into the loop of the suture ST. At this time, by adjusting the position of the thread along the longitudinal direction L of the medical instrument 100, the loop of the suture ST can be hooked into one of the grooves (groove 5b in the example of FIG. 2) formed on the outer circumferential surface F2 of the tip R1. Then, with the suture ST extending in the width direction W of the arm 10, the medical instrument 100 can be further moved in the width direction W of the arm 10 to pull the thread in the width direction W and tighten it. At this time, the thread caught in the groove 5 is less likely to slip, so the surgeon can perform the thread tightening operation more easily and reliably.Suture tightening is a procedure that is often required during surgical procedures. If the suture tightening operation can be performed smoothly using the medical instrument 100 of this embodiment, the entire surgical process can be carried out accurately and quickly.

[0017] Incidentally, as in this embodiment, the medical instrument 100 in which the groove 5 formed on the outer peripheral surface F2 of the arm 10 can be used to tighten the suture thread can be suitably used in all suturing methods in surgical procedures, but is particularly suitable for use in continuous suturing, as the thread tightening operation can be performed while holding the suture needle.

[0018] The grooves 5 formed on the outer peripheral surface F2 of the tip R1 of the arm 10 can be formed at predetermined positions by cutting, etching, etc., after a medical instrument 100 without grooves is manufactured by a normal method. Alternatively, when the medical instrument is molded by casting, injection molding, etc., the grooves 5 can be formed using a casting mold with grooves at predetermined positions.

[0019] A more detailed configuration of the groove 5 will be described below. Fig. 3 shows an enlarged plan view of a part (mainly the tip R1) of one arm 10 of the medical instrument 100 in Fig. 1 as viewed in the width direction W, i.e., as viewed from one side surface F2s of the arm 10. Fig. 4 shows an enlarged plan view of a part (mainly the tip R1) of the arm 10 of the medical instrument 100 in Fig. 1 as viewed in the thickness direction D, i.e., as viewed from the outer surface F2e of the arm 10. Fig. 5 shows a partial cross-sectional view taken along line AA in Fig. 4, i.e., a cross-sectional view of the vicinity of the surface of the outer surface F2e of the arm 10 cut along the longitudinal direction L of the arm 10 at a position including the groove 5. Fig. 6 shows a cross-sectional view taken along line BB in Fig. 4.

[0020] As shown in FIG. 1, FIG. 3 and FIG. 4, in the medical instrument 100 according to this embodiment, a plurality of grooves 5a, 5b, 5c, 5d, 5e, 5f are formed in one arm 10 at a distance from each other. However, as long as the above-mentioned thread tightening operation can be easily performed, the number of grooves formed in one arm 10 of the medical instrument 100 may be one, or may be two or more other than six. If the number of grooves 5 per arm is two or more, the opportunity to hook the thread on the tip R1 along the longitudinal direction L of the arm 10 during the thread tightening operation can be increased, which is preferable. In other words, since the thread may be hooked on any of the plurality of grooves 5, the groove 5 can be selected according to the habits and circumstances of the surgeon and used for thread tightening. Note that, although it depends on the material constituting the medical instrument 100, the depth and width of the groove 5, etc., from the viewpoint of preventing a decrease in the strength of the tip R1, the number of grooves 5 per arm is preferably eight or less.

[0021] Whether the number of grooves 5 in one arm 10 is one or multiple, the range in which the grooves 5 are formed in the arm 10 is within the tip portion R1. The specific range of the length of the tip portion R1 depends on the size and configuration of the medical instrument 100, but may be in the range of 10 mm to 50 mm, preferably 20 mm to 30 mm, from the tip edge in the longitudinal direction L of the arm 10.

[0022] In addition, the position where each groove 5 is formed is not particularly limited as long as the thread tightening operation (FIG. 2) using the groove 5 is possible. However, it is preferable that at least one groove 5 is formed at a position that functions as a graduation line for measuring length (including depth). To make the groove 5 function as a graduation line for measuring length, for example, the distance from the tip edge to the groove (graduation line) 5 can be a length that can be visually recognized by the user and can be a unit for measuring length. Here, the "length that can be a unit for measuring length" may be, for example, 1 mm or a multiple thereof in the metric system, 2.5 mm or a multiple thereof, etc. For example, in the inch system, it may be 0.05 inch or a multiple thereof, or 0.25 inch or a multiple thereof. Thus, for example, the distance from the leading edge to the groove (scale line) 5 closest to the leading edge can be 2.5 mm, 5 mm, 10 mm, 20 mm, etc. for a user who measures lengths in metric units, and can be 0.25 inch, 0.5 inch, 1 inch, 2 inches, etc. for a user who measures lengths in inch units.

[0023] Also, in order to make the grooves 5 function as scale lines for measuring length or depth, for example, the distance (pitch) between at least two grooves can be set as one unit for measuring length (as described above) that is visually recognizable by a user. Thus, for example, the distance between the grooves can be 2.5 mm, 5 mm, 10 mm, 20 mm, etc. for a user who measures length in the metric system, and 0.25 inch, 0.5 inch, 1 inch, 2 inch, etc. for a user who measures length in the inch system.

[0024] In order for the grooves 5 to function as scale lines for measuring length, it is preferable to form a plurality of grooves 5 at a constant pitch or at equal intervals. In this embodiment, as shown in Figures 3 and 4, the grooves 5a, 5b, 5c, 5d, 5e, and 5f formed in one arm 10 are formed at equal intervals at a pitch of 5 mm in the longitudinal direction L of the arm 10. In the illustrated embodiment, the length from the tip edge to the center line of the groove 5a closest to the tip edge is 5 mm, and the distance in the longitudinal direction L between the center lines of the grooves is equal.

[0025] Furthermore, to let the user know that the grooves 5 also serve as graduation lines, letters or marks such as "5mm", "10mm", etc. may be printed or engraved in small letters or marks on the grooves 5. Alternatively, no letters or marks may be printed, or letters or marks may be printed and an instruction manual or the like may explain that the grooves also serve as graduation lines and / or what the distance from the leading edge to the grooves or the distance between the grooves indicates. In this case, the distance from the leading edge to the grooves or the distance between the grooves does not necessarily have to be a round number according to the method of length measurement.

[0026] In this way, the grooves 5 also function as graduation lines, so that the length can be measured without using a separate scale device or the like while the medical instrument 100 is in use. This allows the depth of the wound to be easily measured by inserting the tip R1 of the medical instrument 100 into the wound, and the length and width of the wound on the surface of the tissue can be reliably and easily measured by laying the tip R1 of the medical instrument 100 on the surface of the tissue. It is also useful for grasping not only the wound but also the pitch (suture interval) in the case of continuous suture. That is, with the medical instrument 100 according to this embodiment, the length or depth that one wants to know or measure is obvious at a glance. Therefore, by making it easy to measure the length or depth using the medical instrument 100, the condition of the wound can be quickly grasped. This also contributes to making the explanation of the instructor easier in the educational scene, or helping to deepen the understanding of the person receiving the instruction. In addition, such an action and effect can be obtained not only when the surgical field is directly observed with the naked eye, but also when observed through an image, for example, on a video. It can be particularly difficult to grasp size without a scale when viewing the surgical field through an image rather than looking directly at the actual object. However, even in such situations, the length or depth you want to know or measure can be easily grasped without having to bring out a dedicated scale.

[0027] As described above, the grooves 5 are formed on the outer peripheral surface F2 of the circumferential surface of the arm 10, and when the grooves 5 function as scale lines, this configuration provides the advantage that the scale lines can be seen even when the arms 10, 10 of the medical instrument 100 are closed. This advantage cannot be obtained when the scale is provided on the inner surface of the arm 10.

[0028] Furthermore, the fact that the grooves 5 function as graduation lines means, in other words, that groove-shaped graduation lines are formed. If graduation lines are simply provided on the tip R1 of the arm 10, the graduation lines can be formed by ridges (linear protrusions), or flat graduation lines without unevenness can be formed by coloring or material modification. However, by forming the graduation lines in a groove shape as in this embodiment, it is possible to prevent the ridges from getting caught on living tissue or items used in surgery (gauze, tampons, etc.) during surgery, and to prevent coloring or material modification from adversely affecting living tissue.

[0029] In the embodiment shown in FIG. 1, the groove 5 is formed in each of the arms 10, 10 of the medical instrument 100, but the groove 5 may be formed in only one of the arms 10. However, by forming the groove 5 in both arms 10, 10, the thread can be threaded in the groove 5 regardless of the orientation of the medical instrument 100 when tightening the thread. For example, when the medical instrument 100 is used with the side surface F2s of the arm 10 facing upward as shown in FIG. 2, the thread can be threaded in the groove 5 regardless of which of the arms 10, 10 is at the back, making the thread tightening operation easy. In addition, when the groove 5 functions as a scale line, it provides the advantage that the scale can be visually recognized regardless of the orientation of the medical instrument 100 when used. In addition, when the groove 5 is formed in both arms 10, 10, it is preferable that the position of the groove 5 in the longitudinal direction L of the arms 10 is the same for both arms 10, 10. As a result, even if the thread is hung across one arm 10 and the other arm 10 during the thread tightening operation, the thread fits across the grooves 5 of both arms 10, 10, and the thread can be securely held.

[0030] In addition, the position of the groove 5 in the longitudinal direction L of the arm portion 10 does not have to be the same on both arms 10, 10. For example, one arm 10 may have graduation lines in metric units and the other arm 10 may have graduation lines in inch units.

[0031] The groove width w (FIG. 5) of the groove 5 is not particularly limited as long as the suture used can be caught therein, but is preferably 10 μm to 1.2 mm, more preferably 100 μm to 1 mm, and even more preferably 300 μm to 800 μm. Such a range can accommodate the thickness of the suture normally used in surgery (10 μm to 800 μm). The groove width w may be constant along one groove 5, or may vary along the groove 5. When the groove width w varies along the groove 5, the groove width w may gradually increase or decrease, or the edge of the groove 5 may be wavy, for example. Although the function of the groove 5 to hold the thread is improved by having the edge of the groove 5 be wavy, from the viewpoint of preventing the edge of the groove 5 from being caught on a living tissue or an object during surgery, it is preferable that the edge of the groove 5 is straight. The groove width w (or the average value if the groove width w varies) may be the width measured at the surface position of the outer circumferential surface F2 (the width of the opening of the groove 5).

[0032] When multiple grooves 5 are formed, the groove width w of each groove may be the same or different. For example, the groove width w of the groove 5 closer to the tip may be smaller or larger. Furthermore, the groove width w of the groove 5 formed in one of the arms 10, 10 may be the same as or different from the groove width w of the groove 5 formed in the other arm 10. For example, the groove width w of the groove 5 formed in one arm 10 may be larger or smaller than the groove width w of the groove 5 formed in the other arm 10.

[0033] The depth d of the groove 5 (FIG. 5) is not particularly limited as long as it is large enough to hook the suture used, but may be preferably 10 μm to 1.2 mm, more preferably 100 μm to 1 mm, and even more preferably 300 μm to 800 μm. This allows the groove 5 to accommodate the thickness of the suture normally used in surgical operations (10 μm to 800 μm). The depth d of the groove 5 may also be constant along one groove 5, or may vary along the groove 5. When the depth d varies along the groove 5, the depth d may gradually increase or decrease.

[0034] When a plurality of grooves 5 are formed, the depth d of each groove may be the same or different. For example, the groove 5 closer to the tip may have a smaller or larger depth d. Furthermore, the depth d of the groove 5 formed in one of the arms 10, 10 may be the same as or different from the depth d of the groove 5 formed in the other arm 10. For example, the depth d of the groove 5 formed in one arm 10 may be larger or smaller than the depth d of the groove 5 formed in the other arm 10.

[0035] Furthermore, the groove 5 may be formed over the entire outer circumferential surface F2 of the arm 10 as shown in Figs. 3, 4 and 6. This allows the thread to be threaded in the groove 5 regardless of the orientation of the arm 10, that is, whether the outer surface F2e of the outer circumferential surface F2 of the arm 10 faces upward or any of the side surfaces F2s faces upward. This also provides the advantage that the thread tightening operation is easy whether the user holds the medical instrument 100 in the right hand or the left hand. Furthermore, when the groove 5 functions as a scale line, this provides the advantage that the scale can be seen regardless of the orientation of the medical instrument 100. In other words, the scale can be seen if any part of the outer circumferential surface F2 is visible.

[0036] However, the grooves 5 do not have to be formed over the entire outer peripheral surface F2. The form in which the grooves 5 are formed on a part of the outer peripheral surface F2 depends on the material constituting the medical device 100, the depth and width of the grooves 5, etc., but is preferable from the viewpoint of preventing a decrease in strength of the tip portion R1 or from the viewpoint of simplifying the work of forming the grooves 5 by cutting or the like during the manufacture of the medical device 100.

[0037] FIG. 7 (a view corresponding to FIG. 6) shows a modified example of the groove 5. In the example shown in FIG. 7, the groove 5 is formed only on the outer surface F2e of the outer peripheral surface F2, and is not formed on the side surfaces F2s, F2s. As a result, even if the medical instrument 100 is held with the side surface F2s facing upward as shown in FIG. 2, the thread can be hooked on the outer surface F2e. Also, as shown in FIG. 7, it is preferable that the groove 5 extends to the transition between the outer surface F2e and the side surface F2s. When a loop of thread is hooked on the tip portion R1 of the arm portion 10 (FIG. 2), the direction of the thread changes significantly at the transition between the outer surface F2e and the side surface F2s. If the thread can be more reliably held in the groove 5 at the transition, the thread holding function of the groove 5 will be improved. Note that, if the cross section of the arm portion 10 cut along the width direction W is rectangular, the transition between the outer surface F2e and the side surface F2s corresponds to the vertex of the rectangle.

[0038] As another modified example, the groove 5 may be formed in at least one of the transitions between the outer surface F2e and the side surface F2s, and not formed in other portions (not shown). This configuration can minimize the function of the groove 5 to hold the thread during the thread tightening operation, while preventing a decrease in the strength of the tip portion R1 and facilitating the manufacture of the medical device 100.

[0039] The configuration (number, formation position, groove width, groove depth) of the grooves 5 formed in one arm portion 10 may be the same as or different from the configuration (number, formation position, groove width, groove depth) of the grooves 5 formed in the other arm portion 10. For example, multiple grooves 5 may be formed in one arm portion 10, and one groove 5 may be formed in the other arm portion 10.

[0040] As shown in FIG. 1, a grip portion 7 is formed on the outer surface F2e of the central portion R2 of the arm portion 10 to prevent slipping when the medical instrument 100 is held by hand. The grip portion 7 is uneven formed on the outer surface F2e, and specifically, may be a series of linear grooves along the width direction perpendicular to the longitudinal direction of the arm portion 10. The series of linear grooves formed on the grip portion 7 are formed in the central portion R2 corresponding to the range where the user's fingers are placed, and are separated in the longitudinal direction from the above-mentioned groove 5 formed on the tip portion R1. Note that the grip portion 7 is not limited to linear grooves, and may be formed by forming non-linear unevenness or attaching a material for reducing friction, etc., as long as it makes it difficult for the user's fingers to slip.

[0041] As shown in FIG. 1, the inner surface F1 of the tip R1 of at least one of the arms 10, 10, preferably both, may have a roughened portion 8. The roughened portion 8 may be, for example, fine irregularities formed on the inner surface F1. The roughened portion 8 provides a function that allows the suture needle to be more securely held when the suture needle is held at the tip R1 of the medical instrument 100, that is, a needle-holding function. Therefore, when the suture needle is inserted into tissue and removed, the suture needle can be moved smoothly without the aid of a needle holder or the like. The configuration of the roughened portion 8 can be a known configuration for a needle-holding function. As long as the inner surface F1 of the tip R1 can be partially or entirely roughened, the roughened portion 8 may be in the form of an inner surface F1 with irregularities engraved thereon, a roughened or highly frictional sheet attached to the inner surface F1, or the like.

[0042] Furthermore, as shown in FIG. 1, hooks 9a and 9b are formed on the distal end edge of the distal end R1 of the arms 10 of the medical instrument 100, and the arms 10 are engaged with each other when the arms 10 are closed. In the example shown in FIG. 1, the hook 9a of one arm 10 is a convex portion that protrudes in the width direction W from the inner surface F1 at the center of the thickness direction D, and the hook 9b of the other arm 10 is a concave portion into which the convex hook 9a fits. By engaging such hooks 9a (convex portion) and 9b (concave portion), tissue can be firmly grasped and spread. When the medical instrument 100 has both the roughened portion 8 and the hook 9, it becomes a hooked tool with a needle-holding function. By using such a hooked tool with a needle-holding function, the operation during a surgical operation, particularly the suturing operation using a suture needle and suture thread, can be performed more smoothly. The configuration of the hook portions 9a and 9b is not limited to that shown in the figure, and any hook portion of a known hook-type fastener may be used.

[0043] The above describes the embodiment of the present invention by taking a medical tool, particularly a tool for surgical operation, as an example. However, the embodiment of the present invention is not limited to a tool, but is applicable to any tool used in surgical operation, and is preferably configured as various tools used for suturing and related operations (procedures) in surgical operation. In particular, it is preferably configured as a surgical clamping tool (a medical tool having a pair of arms, each of which has opposing surfaces facing each other and can clamp an object). Specific examples of forms other than a clamp include forceps, needle holders, scissors, and other tools that may catch a suture during surgery. In addition, the size of the medical tool according to this embodiment is not limited, and this embodiment may be, for example, a tool used while checking the operation visually, or a tool used while checking the operation using a magnifying glass, endoscope, etc.

[0044] Furthermore, the configuration of the grooves, etc. is not limited to the above embodiment. The embodiments shown in this specification are subject to various changes, modifications, substitutions, additions, deletions, and combinations within the scope of the claims, and these also belong to the technical scope of the present invention. [Explanation of symbols]

[0045] 5, 5a~5f groove 7 Grip 8 Roughened area 9a, 9b hook part 10 Arm 100 Medical instruments (surgical instruments) F1 Opposite surface (inner surface) F2 outer surface F2s: Side of the outer periphery F2e Outer surface of the outer periphery R1 Tip R2 central part R3 joint

Claims

1. A medical instrument having a pair of arms each having a mutually opposing surface, and capable of holding an object between the opposing surfaces at the tips of the arms, A medical instrument, comprising: an outer peripheral surface of the tip portion other than the opposing surface, the outer peripheral surface having a groove formed thereon along a lateral direction perpendicular to the longitudinal direction of the arm portion.

2. The medical instrument of claim 1 , wherein at least one of the grooves functions as a scale mark for length measurement.

3. The medical instrument according to claim 1 or 2, wherein the groove is formed continuously over the entire outer circumferential surface of at least one of the arms.

4. The medical device according to claim 1 or 2, wherein the groove has a width of 10 μm or more and 1.2 mm or less.

5. The medical instrument according to claim 1 or 2, wherein the tip portion is a hook.

6. The medical instrument according to claim 1 or 2, wherein the facing surface of the tip portion is provided with projections and recesses.

Images