Abstract: An infusion pipe capable of achieving a flow rate higher or the same as that of a conventional product, and of easily joining to a cannula attached to an eyeball. The infusion pipe of the present invention is used in an ophthalmic operation with the infusion pipe joined to a cannula attached to an eyeball, and includes an insertion part to be inserted, at the time of joining to the cannula, inside a cannula piercing part, which is a part of the cannula for piercing the eyeball. A cross-section of the insertion part is an arc shape from which a part of a circle is cut out.

Abstract: Provided is a dental file exhibiting high performance and having high flexibility and excellent root canal followability. A dental file (10) of the present invention includes a working portion (11) in a spiral shape. An outer edge of the sectional shape of the working portion (11) at any position includes a single arc (40) and three or more lines (41, 42, 43). One end of the arc (40) forms a first cutting blade. The three or more lines (41, 42, 43) are positioned inside a virtual circle (50) partially including the arc (40). The length of the arc (40) may be equal to or greater than 1/12 and equal to or less than ? of the circumferential length of the virtual circle (50), or a second cutting blade (16) may be further provided inside the virtual circle (50).

Abstract: A dental file includes a working portion having a spiral shape, wherein a cross section perpendicular to a longitudinal direction of the working portion has a trapezoidal shape including an upper bottom, a lower bottom, and first and second oblique sides, vertexes at both ends of the lower bottom are located on an imaginary circle having a center at an axis in the longitudinal direction of the working portion, vertexes at both ends of the upper bottom are located inside the imaginary circle, and the imaginary circle has a diameter decreasing from a base end portion toward a leading end portion of the working portion.

Abstract: To reliably follow a tip end portion of a root canal and prevent biting into a root canal wall. A dental root canal treatment tool includes a shaft portion (A), a transition portion (D) formed continuously to the shaft portion, and a working portion (B) formed continuously to the transition portion. The working portion is formed in such a tapered shape that the working portion is narrowed from the transition portion to a tip end. A cross section (IIa) of the working portion closest to a shaft portion side is in a parallelogram shape having a pair of opposing long sides (1a), a pair of opposing short sides (2a), sharp edges (5a) formed on a long diagonal line (3a), and obtuse edge (6a) formed on a short diagonal line (4a).

Abstract: A cannula holder capable of securing a cannula to the holder at the time of piercing work, and easily removing the cannula from the holder using tweezers or the like. The cannula holder, to which a piercing needle for piercing an eyeball and a cannula are attached when attaching the cannula used in ophthalmic operations to the eyeball, includes claw portions that are formed on a front end of the cannula holder and which press sides of the cannula either at positions where said claw portions face each other or from multiple directions. A depression may be provided in a side of the front end of the cannula holder, allowing visibility of a part of a back end of the cannula from the depression.

Abstract: Provided is a dental file with excellent flexibility, cutting performance, and fracture resistance. The dental file (10) of the present invention has a spiral working portion (11) of which cross sections become smaller toward a tip end. At least one of shapes of the cross sections of the working portion (11) is a substantially rectangular shape formed of a single arc (40) and three lines (41, 42, 43), Two points of four points at four corners of the substantially rectangular shape are arranged on a virtual circle (50), which includes the arc (40) as part thereof. The other two points are arranged inside the virtual circle (50). The center position of the virtual circle (50) is inside the substantially rectangular shape. A shortest one of lengths of perpendicular lines each extending from the center position of the virtual circle (50) including the arc (40) as part thereof to the three lines (41, 42, 43) is equal to or greater than 45% and equal to or less than 65% of the radius of the virtual circle (50).

Abstract: There is provided a cannula that suppresses leakage of vitreous humor, etc., from a slit through which a surgical tool is inserted. A cannula (10) used for piercing through an eyeball during an ophthalmic operation, includes: a pipe (11); a cylindrical base (12) fitted together with the circumference of a base end of the pipe (11); a resin cap (13) including a cover surface (13c) covering the surface of the base end of the pipe (11) and a side surface (13a) covering a cylindrical side surface of the base (12); and a slit (13d) passing through the center of the cover surface (13c). The outer diameter of the cylindrical side surface of the base (12) at a position where the cylindrical side surface of the base (12) touches the side surface (13a) of the cap is larger than the inner diameter of the side surface of the cap.

Abstract: Provided is a medical suture needle configured so as to reduce the risk of bending and cracks occurring in a tip part in which a point is formed. The medical suture needle includes a cutting blade section (10) and a body section (20) that is continuous with the cutting blade section. The cutting blade section comprises one bottom surface (11) and two inclined surfaces (12) and includes a point (13) at which the one bottom surface and the two inclined surfaces meet, a cutting blade (14) formed so as to be continuous from the point and such that the bottom surface and the inclined surfaces meet, and a ridge (15) formed so as to be continuous from the point and such that the two inclined surfaces meet. The thickness of the cutting blade section decreases from the body section toward the point.

Abstract: A medical knife has a flat projection shape of a cutting part formed in an approximate rhomboid shape including a front end part, a widest part with the largest width, and a side surface part formed between the front end part and the widest part. A front side bevel constituting an edge on the front side and a back side bevel constituting an edge on the back side are individually formed, having as a boundary a virtual surface including an edge formed along the periphery of the cutting part. A ratio of the angle ? between the virtual surface and the back side bevel to the angle ? between the virtual surface and the front side bevel at the front end part is greater than the ratio of the angle ? between the virtual surface and the back side bevel to the angle ? at the side surface part.

Abstract: [Problem] To rationalize production steps for a medical stapler. [Solution] An anvil (A): that forms a medical staple (3) supported in conjunction with a ram (5) in a medical stapler; sutures biological tissue; has dimensions corresponding to the formed peak section in the staple (3) after forming; and has a support section (11) that supports the crown (3b) of the staple (3), and a chamfered corner section (12) formed along both end sections in a direction along the crown (3b) of the staple (3) in the support section (11), which comes in contact with the crown (3b) when the supported staple (3) is formed and regulates a curved section thereof. The chamfered corner section (12) is cured by plastic working and formed.

Abstract: An object of the present invention is to provide a method for producing a black-colored medical device being safe for living bodies with a shortened time for applying a pulse potential. The method for producing the black-colored medical device includes a step S1 of applying a square wave pulse potential to a stainless-steel medical device immersed in an electrolytic aqueous solution as one electrode for 40 to 90 minutes to form a colored passivation film on a surface of the medical device; and a step S3 of applying silicone to the medical device after applying the pulse potential. The method may include a step of curing a part of the medical device after the step of applying the pulse potential and before the step of applying silicone.

Abstract: The purpose of the present invention is to provide a medical suture needle with improved strength against repeated bending while ensuring visibility. The medical suture needle A including a needle tip part with a needle tip for piercing tissue, a base part for attaching a suture thread thereto, and a body part between the needle tip part and the base part, in which the body part includes at least one shallower groove 5 in a direction from the needle tip part to the body part, and the shallower groove 5 is defined by two opposing gentle slopes 6.

Abstract: The purpose of the present invention is to enable safer treatment and to reduce variation of treatment effects in root canal treatment using a dental handpiece, regardless of operator's skill level. The present invention is a dental handpiece system including a handpiece and a rod-shaped cutting tool, in which the handpiece includes a handpiece body and a head part provided at a tip of the handpiece body, the rod-shaped cutting tool is rotatably attached to the head part of the handpiece and is used to cut a root canal, and the dental handpiece system detects at least one selected from the group consisting of a force applied to the handpiece from an external matter in an axial direction of the cutting tool and an acceleration of the handpiece in the axial direction of the cutting tool when cutting the root canal.

Abstract: A medical knife has a flat projection shape of a cutting part formed in an approximate rhomboid shape including a front end part, a widest part with the largest width, and a side surface part formed between the front end part and the widest part. A front side bevel constituting an edge on the front side and a back side bevel constituting an edge on the back side are individually formed, having as a boundary a virtual surface including an edge formed along the periphery of the cutting part. A ratio of the angle ? between the virtual surface and the back side bevel to the angle ? between the virtual surface and the front side bevel at the front end part is greater than the ratio of the angle ? between the virtual surface and the back side bevel to the angle ? at the side surface part.

Abstract: There is provided a cannula that suppresses leakage of vitreous humor, etc., from a slit through which a surgical tool is inserted. A cannula (10) used for piercing through an eyeball during an ophthalmic operation, includes: a pipe (11); a cylindrical base (12) fitted together with the circumference of a base end of the pipe (11); a resin cap (13) including a cover surface (13c) covering the surface of the base end of the pipe (11) and a side surface (13a) covering a cylindrical side surface of the base (12); and a slit (13d) passing through the center of the cover surface (13c). The outer diameter of the cylindrical side surface of the base (12) at a position where the cylindrical side surface of the base (12) touches the side surface (13a) of the cap is larger than the inner diameter of the side surface of the cap.

Abstract: The purpose of the present invention is to provide a training device for ophthalmic surgery so as to make it possible to readily practice inner limiting membrane peeling by using a simulated eye including a Japanese quail eggshell. This training device 1 for ophthalmic surgery includes a base 10 with a hollow portion 11 and a soft simulated sclera member 20 shaped like a part of sphere, wherein the hollow portion 11 is tapered from an upper side to a lower side and houses, upon use, a simulated eye 50 including an eggshell; the simulated sclera member 20 is provided on an upper side of the base 10; and a surgical instrument can contact, through the simulated sclera member 20, an inner surface of the simulated eye 50.

Abstract: A cannula holder capable of securing a cannula to the holder at the time of piercing work, and easily removing the cannula from the holder using tweezers or the like. The cannula holder, to which a piercing needle for piercing an eyeball and a cannula are attached when attaching the cannula used in ophthalmic operations to the eyeball, includes claw portions that are formed on a front end of the cannula holder and which press sides of the cannula either at positions where said claw portions face each other or from multiple directions. A depression may be provided in a side of the front end of the cannula holder, allowing visibility of a part of a back end of the cannula from the depression.

Abstract: A nose knife with good usability and little interference with tools such as an endoscope in nasal cavity surgery is provided, and includes a handle, a shank, and a blade. The shank includes a straight part connected straight to the handle along the same axis, and a curved part integrally connected to the front end of the straight part. The blade is provided at the front end of the curved part. A tip of the blade is angled 65 degrees to 75 degrees inclusive relative to the axis of the straight part.

Abstract: There is provided a piercing needle-equipped cannula that has a pre-attached piercing needle, and no deformation of the slit portion due to the piercing needle is left after the piercing needle is pulled out. A piercing needle-equipped cannula (100) includes: a cannula (10) pierced in an eyeball and used in ophthalmic operations; a resin cap (13) having a slit (13a) opened in the cannula (10); and a piercing needle (15) attached to the cannula (10). The piercing needle (15) includes a needle main body (15c) on a front end side, a base (15d) on a base end side, and a slit piercing part (15s) piercing the slit (13a) in a state where the needle main body (15c) and the base (15d) are connected, and the cross-sectional area of the slit piercing part (15s) is smaller than that of the thickest part of the needle main body (15c).

Abstract: Provided is a two-dimensional code display medium which displays a distinctive two-dimensional code that is readily noticeable by itself, as well as being easy for a person to visually determine whether or not the two-dimensional code is the person's desired code. The two-dimensional code display medium according to the present invention is characterized by being provided with an information display surface having therein a display region for displaying a two-dimensional code, wherein the information display surface is square, and one side of the two-dimensional code and one side of the information display surface form an oblique angle therebetween. Further, the oblique angle is preferably 45 degrees.