Abstract: A bone plate includes a plate body portion extending in a lengthwise direction, a head portion extending from one end portion in the lengthwise direction of the plate body portion, and tabs provided on the outer side of an outer peripheral portion of the head portion. The tabs comprise first-type tabs and side by side with each other, and a second-type tab located on one outside of the first-type tabs. The first-type tabs respectively include first connecting portions that are bendable and have a cross-sectional area in a widthwise cross section that is smaller than the cross-sectional area of the outer shape of the first tab body portions. The second-type tab includes a second connecting portion that is bendable and twistable and has a smaller cross-sectional area in a widthwise cross section than the first connecting portions.

Abstract: A bone plate bending tool includes a substantially rod-shaped first member having a first sandwiching surface, a substantially rod-shaped second member slidable along a side part of the first member and having a second sandwiching surface, and a connection tubular member connected to the second member and enclosing a peripheral surface of the first member. A projection on one of the sandwiching surfaces is insertable into a through-hole of the bone plate and does not prevent the bone plate from being sandwiched between the sandwiching surfaces. The connection tubular member is axially movable on the peripheral surface of the first member while the second member is disposed on the first member's side part. The connecting tubular member that has moved axially forward restricts expansion between the sandwiching surfaces. The sandwiching surfaces, together with the forward-moved connecting tubular member, sandwich and immovably hold a peripheral edge of the bone plate through-hole.

Abstract: A fixation mechanism in which a first thread groove extending in one turning direction and a second thread groove extending in a turning direction opposite to the one turning direction and intersecting the first thread groove are formed in a first member-side thread portion of a first member. The thread divided portion being formed as a result of the first thread groove and the second thread groove intersecting each other. A second member-side thread portion of a second member can be screwed to the first thread groove of the first member-side thread portion. The second member is fixed at a suitable angle 0 relative to the first member.

Abstract: A bone plate bending tool includes a substantially rod-shaped first member having a first sandwiching surface, a substantially rod-shaped second member slidable along a side part of the first member and having a second sandwiching surface, and a connection tubular member connected to the second member and enclosing a peripheral surface of the first member. A projection on one of the sandwiching surfaces is insertable into a through-hole of the bone plate and does not prevent the bone plate from being sandwiched between the sandwiching surfaces. The connection tubular member is axially movable on the peripheral surface of the first member while the second member is disposed on the first member's side part. The connecting tubular member that has moved axially forward restricts expansion between the sandwiching surfaces. The sandwiching surfaces, together with the forward-moved connecting tubular member, sandwich and immovably hold a peripheral edge of the bone plate through-hole.

Abstract: A bone treating device has a bone plate and a bone screw. The bone plate has an opening which penetrates therethrough and has a female screw part having a plurality of thread grooves formed on an inner surface of the opening. The bone screw has a shaft part capable of penetrating the opening of the bone plate and a head part provided at a proximal end of the shaft part. The head part has on an outer surface thereof a male screw part having a plurality of screw threads threadedly engageable with the thread grooves of the female screw part formed on the inner surface of the opening. The bone screw has a threaded engagement start guiding portion formed by extending screw threads whose number is fewer by at least one than the number of screw threads formed in the male screw part to a threaded engagement start side.

Abstract: A bone treating device has a bone plate and a bone screw. The bone plate has an opening which penetrates therethrough and has a female screw part having a plurality of thread grooves formed on an inner surface of the opening. The bone screw has a shaft part capable of penetrating the opening of the bone plate and a head part provided at a proximal end of the shaft part. The head part has on an outer surface thereof a male screw part having a plurality of screw threads threadedly engageable with the thread grooves of the female screw part formed on the inner surface of the opening. The bone screw has a threaded engagement start guiding portion formed by extending screw threads whose number is fewer by at least one than the number of screw threads formed in the male screw part to a threaded engagement start side.

Abstract: A male fastening tool body includes a body part, a flange part which has a seat surface, an annular concave part formed between the body part and the seat surface, and a resinous ring-shaped member disposed at the annular concave part. The annular concave part has an annular concave peripheral edge portion. The resinous ring-shaped member has an annular projected part which fills almost the entire annular concave part and a lower surface of which is projected downward beyond the seat surface and an annular peripheral part, having a tapered bottom surface or a curved bottom surface, which is formed between the annular projected part and the outer edge of the resinous ring-shaped member and becomes gradually thinner, with an outer edge of the resinous ring-shaped member being located at an outer edge of the annular concave peripheral edge portion or slightly toward the side of the body part.

Abstract: A bolt has a bolt body including a screw part, a head part formed at an upper end of the screw part, and a flange part formed at a lower end of the head part; and an unconductive ring-shaped resinous member covering a peripheral portion of the flange part. The flange part has a disk-shaped flange body portion; and a seat surface-forming portion having a seat surface which is pressed against a portion where the bolt is to be mounted. The ring-shaped member has an edge part which is located at a position nearer to a lower end of the screw part than the seat surface and outward from the flange body portion and an annular skirt part whose diameter gradually increases to the edge part. The annular skirt part is so formed that it deforms when the bolt is mounted on the portion where the bolt is to be mounted and forms an annular liquid-tight sealing portion for the portion where the bolt is to be mounted.

Abstract: A male fastening tool body includes a body part, a flange part which has a seat surface, an annular concave part formed between the body part and the seat surface, and a resinous ring-shaped member disposed at the annular concave part. The annular concave part has an annular concave peripheral edge portion. The resinous ring-shaped member has an annular projected part which fills almost the entire annular concave part and a lower surface of which is projected downward beyond the seat surface and an annular peripheral part, having a tapered bottom surface or a curved bottom surface, which is formed between the annular projected part and the outer edge of the resinous ring-shaped member and becomes gradually thinner, with an outer edge of the resinous ring-shaped member being located at an outer edge of the annular concave peripheral edge portion or slightly toward the side of the body part.

Abstract: A fixing tool used in a ligament reconstruction operation includes a fixing member having a main body part provided with a through-hole and two spike parts which can be stricken into the bone and a fixing screw. The fixing screw includes a shaft part having a self-tap portion and a male screw portion, a head part, and a lumen. The fixing screw can be screwed into the bone plug in a state where a guide pin pierced into the bone plug penetrates the lumen of the fixing screw and a pulling member mounted to the bone plug and extended from the bone tunnel is being pulled. The fixing screw can adjust a tensile force of the tendon graft by adjusting the amount of screwing of the fixing screw into the bone plug after the head part of the fixing screw contacts the fixing member.

Abstract: A fixing tool used in a ligament reconstruction operation to fix a tendon graft having a bone plug can be inserted into a bone tunnel formed at a bone. The fixing tool includes a fixing member having a main body part provided with a through-hole and two spike parts which extend almost parallelly and can be stricken into the bone and a fixing screw including a shaft part having a self-tap portion and a male screw portion, a head part, and a lumen. The fixing screw can be screwed into the bone plug in a state where a guide pin pierced into the bone plug is penetrated through the lumen of the fixing screw and a pulling member mounted to the bone plug and extended from the bone tunnel is being pulled. The fixing screw can be adjusted a tensile force of the tendon graft by adjusting an amount of screwing of the fixing screw into the bone plug after the head part of the fixing screw contacts to the fixing member.

Abstract: A nut 1 of the present invention has a nut body 2 including a female screw part 5 extended axially and a flange part 4 projected outward from a side surface of the nut body 2; and an unconductive ring-shaped resinous member 3 covering a peripheral portion of the flange part 4. The flange part 4 has a disk-shaped flange body portion 41; and a seat surface-forming portion 42 which is extended downward from a lower surface of the flange body portion 41, has a smaller diameter than the flange body portion 41, and has a seat surface 43 to be pressed against a portion where the nut is to be mounted. The unconductive ring-shaped resinous member 3 has an edge part 31 located below the seat surface 43 and outward from the flange body portion 4; and an annular skirt part 32 whose diameter gradually increases to the edge part 31.

Abstract: A bolt has a bolt body including a screw part, a head part formed at an upper end of the screw part, and a flange part formed at a lower end of the head part; and an unconductive ring-shaped resinous member covering a peripheral portion of the flange part. The flange part has a disk-shaped flange body portion; and a seat surface-forming portion having a seat surface which is pressed against a portion where the bolt is to be mounted. The ring-shaped member has an edge part which is located at a position nearer to a lower end of the screw part than the seat surface and outward from the flange body portion and an annular skirt part whose diameter gradually increases to the edge part. The annular skirt part is so formed that it deforms when the bolt is mounted on the portion where the bolt is to be mounted and forms an annular liquid-tight sealing portion for the portion where the bolt is to be mounted.

Abstract: A ligament graft-fixing apparatus has a rod-shaped shaft and a ligament graft-fixing unit that can be removably mounted on the rod-shaped shaft. The ligament graft-fixing unit has a screw part which drills a bone to form a tunnel therein to hold the ligament graft-fixing unit in the bone tunnel; a ligament graft-holding part; and a mounting tunnel in which the rod-shaped shaft is mounted. The mounting tunnel and the rod-shaped shaft have a torque transmission mechanism which transmits a rotational force imparted to the rod-shaped shaft to the ligament graft-fixing unit; and a removal prevention mechanism which holds the ligament graft-fixing unit on the rod-shaped shaft.

Abstract: A self tapping bolt which fastens a mounting member and a receiving member while the bolt cuts internal threads on an inner surface of a tap drill hole prepared in the receiving member. The bolt includes at least one groove formed near an end of a threaded portion of the bolt and a blade for cutting the internal threads. The bolt includes the feature of the blade being formed only on a rear end surface of the groove relative to a rotational direction of the bolt which is screwed into the tap drill hole.