JP2019136315A - Surgical torque wrench - Google Patents

Abstract

To provide a surgical torque wrench that is easily cleaned while being miniaturized.SOLUTION: A surgical torque wrench 1 includes: a main body 10 having a head 11 where a screw 60 is connected and a cylindrical body 12 extending from the head 11; a main shaft 30 having elasticity, inserted into a body part 12 and being held to the body part 12; and a scale part 40. In the body part 12, a notch 22 having a width larger than the smallest width of an outer shape in the cross section vertical to the longitudinal direction of the main shaft 30 is formed from the edge at the side opposite to the head 11 to a predetermined position along the extending direction. The end at the side opposite to the head 11 of the main shaft 30 is protruded outside from the edge at the side opposite to the head 11 in the body part 12. The scale part 40 has a scale 42 showing the bending degree of the main shaft 30 based on the extending direction of the body part 12 at the time when the main shaft 30 is bent at the side where the notch 22 is positioned.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a surgical torque wrench.

  Currently, a surgical torque wrench capable of tightening a screw with a predetermined torque is known in the medical field such as dentistry. For example, in an implant treatment, a support base is generally fixed to a root portion embedded in a jawbone with a screw, and an artificial tooth is attached to the support base. If the torque for tightening the screw when attaching the support base to the root portion with a screw is small, the artificial tooth may be rattled. If this torque is large, the support base or the like may be damaged. For this reason, a surgical torque wrench capable of tightening a screw with a predetermined torque is used.

  In the following Patent Document 1, a ratchet device having a cylindrical ratchet handle having a ratchet head and a bolt rod inserted into the ratchet handle, a cylindrical support body attached to the torque device, linear elasticity and one end A surgical torque wrench is disclosed that includes a bending rod secured to and extending along the support and a torque indicator having a scale located on the support. In this surgical torque wrench, torque can be transmitted to the screw fitted to the screwing tool by applying a force to the bending rod while the bolt rod is engaged with the screwing tool inserted into the ratchet head. At this time, the bending rod bends according to the applied torque, and the torque generated on the screw can be determined by a scale indicating the degree of bending of the rod. Therefore, the surgical torque wrench can tighten the screw with a predetermined torque.

Japanese Patent No. 2966772

  By the way, the instrument generally used in the medical field is subjected to cleaning including sterilization every time it is used. In the surgical torque wrench described in Patent Document 1, since the ratchet handle of the ratchet instrument and the support for the torque indicator are cylindrical, the inside thereof tends to be difficult to clean.

  In addition, instruments used in the medical field may be used by being inserted into a narrow space, such as the oral cavity, and there is a demand for miniaturization.

  Therefore, the present invention is intended to provide a surgical torque wrench that is easy to clean while being downsized.

  In order to achieve the above object, a surgical torque wrench according to the present invention includes a main body having a head to which a screw is connected and a cylindrical body extending from the head, and an elastic body inserted into the body. A notch whose width is larger than the minimum width of the outer shape in a cross section perpendicular to the longitudinal direction of the main shaft. Is formed from the end opposite to the head to a predetermined position along the extending direction of the body, and the end of the main shaft opposite to the head is opposite to the head in the body The scale portion protrudes outward from a side end, and the scale portion has a scale indicating the degree of bending of the main shaft with respect to the extending direction of the body portion when the main shaft is bent on the side where the notch is located. It is characterized by this.

  In the surgical torque wrench of the present invention, since the main shaft is held by the body portion, when torque is applied to the main shaft, the torque is transmitted to the main body. Therefore, the surgical torque wrench can apply torque to the screw connected to the head by torque applied to the main shaft, and can tighten the screw. The form in which the screw is connected to the head includes a form in which the screw is directly connected to the head and a form in which the screw is connected to the head via a tool or the like.

  In this surgical torque wrench, the main shaft has elasticity, and the scale portion has a scale indicating the degree of bending of the main shaft. Here, since the torque applied to the screw connected to the head has a predetermined relationship with the degree of bending of the main shaft, the torque applied to the screw can be understood from the degree of bending of the main shaft. Thus, the surgical torque wrench can tighten the screw with a desired torque.

  Moreover, in this surgical torque wrench, since the main shaft is inserted into the cylindrical body, the size can be reduced as compared with the case where the entire main shaft is located outside the main body.

  Further, in this surgical torque wrench, a notch whose width is larger than the minimum width of the outer shape in a cross section perpendicular to the longitudinal direction of the main shaft is formed on the trunk from the end opposite to the head. It is formed to a predetermined position along the extending direction. For this reason, when the main shaft is bent toward the notch with respect to the body portion, a part of the curved portion of the main shaft can protrude from the notch to the outside of the body portion. For this reason, it is possible to suppress the bending of the main shaft from being hindered by the body part, and it is possible to reduce the outer diameter of the body part and to reduce the size of the surgical torque wrench as compared with a cylindrical body part not formed with a notch. . In addition, it is easier to clean the inside of the body portion than a cylindrical body portion in which notches are not formed. The minimum width of the outer shape in the cross section perpendicular to the longitudinal direction of the main axis is, for example, the diameter when the outer shape of the cross section is approximately circular, and between the opposite sides when the outer shape of the cross section is approximately polygonal. It is the minimum distance among the distances.

  It is preferable that the main body can be disassembled into the head and the body.

  In this case, the head and the body can be cleaned separately, and the main body can be cleaned more easily than when the main body cannot be disassembled into the head and the body.

  The scale part may be attached to the body part.

  Alternatively, the scale portion may be attached to the main shaft.

  The head includes a housing portion that houses at least a part of the screw or at least a part of a tool to which the screw is connected, and the main shaft extends to the housing portion and extends in the axial direction of the main shaft. It is preferable to be movable.

  By adopting such a configuration, the end of the main shaft on the side of the head can be engaged with an engaging portion of a screw or an engaging portion of a tool, such as a groove or a protrusion, or this engagement can be released. With this main shaft, the screw can be connected to the head or the connection can be released. For this reason, this surgical torque wrench can connect a screw to the head of the main body without using another member different from the main shaft, for example, the bolt rod in the surgical torque wrench described in Patent Document 1 above. Can be solved. Therefore, compared with the case where a screw is connected with the head of a main body by another member different from a main axis | shaft, a surgical torque wrench can be made a simple structure. Further, when the screw or tool has a plurality of the engaging portions, the user can set the extending direction of the surgical torque wrench with respect to the screw or tool without removing the screw or tool from the housing portion of the head. Since it can be changed, a surgical torque wrench with good operability can be obtained.

  When the main shaft is movable in the axial direction of the main shaft as described above, the main shaft is rotatable about the axis of the main shaft, and the end of the main shaft on the head side is It is preferable to have an inclined surface inclined with respect to the axial direction so as to taper toward the head side of the main shaft.

  The force applied to the inclined surface inclined with respect to the axial direction so as to taper acts on the direction substantially perpendicular to the axial direction of the main shaft and the axial direction of the main shaft. Can move. For this reason, when a torque is applied to the surgical torque wrench and the above-mentioned screw or tool comes into contact with the inclined surface and a force is applied to the inclined surface, the main shaft moves in the axial direction and the end of the main shaft The engagement with the engaging portion of the screw or tool can be released, and torque can be prevented from being applied to the screw. On the other hand, if no force is applied to the inclined surface when a torque is applied to the surgical torque wrench, this engagement is not released and torque can be applied to the screw. Accordingly, it is possible to prevent the torque from being applied to the screw in accordance with how the torque is applied to the surgical torque wrench. In addition, since the main shaft is rotatable about the axis of the main shaft, the direction of the inclined surface with respect to the engaging portion of the screw or tool can be changed. Therefore, since the user can change the way of applying torque that can apply torque to the screw without removing the screw or tool from the housing portion of the head, a surgical torque wrench with good operability can be obtained.

  When the main shaft is movable in the axial direction of the main shaft as described above, it is preferable that the main body further includes an elastic body that biases the main shaft toward the head.

  With this configuration, the user can engage the end of the main shaft with the screw engaging portion or the tool engaging portion connected to the screw without moving the main shaft toward the head. Therefore, a surgical torque wrench with good operability can be obtained.

  As described above, according to the present invention, it is possible to provide a surgical torque wrench that is easy to clean while being downsized.

It is a front view which shows an example of the surgical torque wrench which concerns on 1st Embodiment of this invention. FIG. 2 is a cross-sectional view of a surgical torque wrench passing through the main shaft of FIG. 1. It is a side view of the surgical torque wrench of FIG. It is a front view which shows an example of the tool latched by the surgical torque wrench of FIG. It is a figure which shows the state by which the tool was latched by the surgical torque wrench of FIG. 1 from the same viewpoint as FIG. It is a figure which shows the state by which the tool was latched by the surgical torque wrench of FIG. 1 from the same viewpoint as FIG. It is a figure which shows the surgical torque wrench which concerns on 2nd Embodiment of this invention from the same viewpoint as FIG. It is a figure which shows the surgical torque wrench which concerns on 2nd Embodiment of this invention from the same viewpoint as FIG.

  Hereinafter, the form for implementing the surgical torque wrench which concerns on this invention is illustrated with an accompanying drawing. The embodiments exemplified below are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved from the following embodiments without departing from the spirit of the present invention.

(First embodiment)
FIG. 1 is a front view showing an example of a surgical torque wrench according to the present embodiment. As shown in FIG. 1, the surgical torque wrench 1 of this embodiment includes a main body 10, a main shaft 30, and a scale portion 40 as main components.

  2 is a cross-sectional view of the surgical torque wrench passing through the main shaft of FIG. 1, and FIG. 3 is a side view of the surgical torque wrench of FIG. In FIG. 3, a part of the head 11 is shown in cross section. As shown in FIG. 2, the main body 10 of the present embodiment includes a head portion 11, a body portion 12, a lock nut 13, and a coil spring 23 as main components.

  The head portion 11 of this embodiment includes a cylindrical locking portion 14 and a cylindrical connection portion 15. The connecting portion 15 extends from the locking portion 14 in the radial direction of the locking portion 14. The connecting portion 15 includes, in order from the locking portion 14 side, a small-diameter portion 16 where the inner diameter of the connecting portion 15 is minimized, and a large-diameter portion connected to the small-diameter portion 16 and having an inner diameter larger than the diameter of the small-diameter portion. 17. The small diameter portion 16 is formed with a protrusion 18 protruding from the inner peripheral surface. The large-diameter portion 17 includes, in order from the end opposite to the locking portion 14 side, an insertion portion 17A in which the outer diameter of the large-diameter portion 17 is minimized, and an outer diameter that is connected to the insertion portion 17A is larger than that of the insertion portion 17A. And an abutting portion 17B which is made large. The outer diameter of the contact portion 17B is substantially the same as the outer diameter of the small diameter portion 16. An end surface on the insertion portion 17A side of the contact portion 17B as a boundary between the insertion portion 17A and the contact portion 17B is a flat surface that is substantially perpendicular to the extending direction of the connection portion 15. Further, a male screw is formed on the outer peripheral surface of the contact portion 17B. A space surrounded by the cylindrical locking portion 14 is defined as a housing portion 19, and a circular opening 14 </ b> H that connects the housing portion 19 and the internal space of the connecting portion 15 is formed in the locking portion 14. Moreover, as shown in FIG. 3, the annular groove | channel 20 is each formed in the both ends of the cylinder axial direction in the internal peripheral surface of the latching | locking part 14. As shown in FIG.

  As shown in FIG. 2, the body portion 12 of the present embodiment is a cylindrical member, and a connecting portion 15 of the head portion 11 is fixed to one end portion in the extending direction of the body portion 12 by a cylindrical lock nut 13. Has been. Specifically, the body part 12 has a fitting part 12A in which the outer diameter of the body part 12 is made larger than the outer diameters of other parts from one end to a predetermined position along the extending direction. An end surface of the fitting portion 12 </ b> A, which is one end of the trunk portion 12, on the connection portion 15 side is a plane that is substantially perpendicular to the extending direction of the trunk portion 12. Further, the end surface of the fitting portion 12A opposite to the connection portion 15 side as a boundary between the fitting portion 12A and the portion other than the fitting portion 12A in the trunk portion 12 is substantially perpendicular to the extending direction of the trunk portion 12. It is assumed to be a plane. The body portion 12 is inserted into the lock nut 13, and the insertion portion 17 </ b> A in the large diameter portion 17 of the connection portion 15 is inserted into the fitting portion 12 </ b> A of the body portion 12. The lock nut 13 covers the fitting portion 12A of the body portion 12, the insertion portion 17A of the connection portion 15, and a part of the contact portion 17B. A female screw that engages with a male screw formed on the outer peripheral surface of the contact portion 17B is formed on the inner peripheral surface of the lock nut 13 on the connection portion 15 side. Further, a protrusion 13A that protrudes from the inner peripheral surface of the inner peripheral surface of the lock nut 13 and abuts on the end surface opposite to the connection portion 15 side of the fitting portion 12A is formed. When the female screw of the lock nut 13 and the male screw of the contact portion 17 </ b> B are screwed together, the body portion 12 moves to the connection portion 15 side and the body portion 12 is pressed against the connection portion 15. Specifically, the end surface on the connection portion 15 side of the fitting portion 12A, which is one end of the body portion 12, is pressed against the end surface on the insertion portion 17A side of the contact portion 17B. In this way, one end portion of the trunk portion 12 is fixed to the end portion of the connection portion 15 opposite to the locking portion 14. The main body 10 can be disassembled into the head portion 11 and the trunk portion 12 by unscrewing the female screw of the lock nut 13 and the male screw of the contact portion 17B.

  In addition, the structure which fixes the trunk | drum 12 to the connection part 15 is not specifically limited. Although description by illustration is abbreviate | omitted, the edge part on the opposite side to the latching | locking part 14 of the connection part 15 is inserted in the one end part of the trunk | drum 12, for example, and the inner peripheral surface of the trunk | drum 12 is crimped | bonded to the outer peripheral surface of the connection part 15 By doing so, the body portion 12 may be fixed to the connection portion 15. As such a configuration, for example, a plurality of cutouts are formed in the body portion from one end to a predetermined position along the extending direction, and one end portion of the body portion where the notches are formed is opposite to the locking portion of the connection portion. The side edge part is inserted, and the structure which a lock nut engages with the external screw formed in the outer peripheral surface of the one end part of a trunk | drum is mentioned. In this case, the inner peripheral surface of one end portion of the body portion is pressed against the outer peripheral surface of the end portion on the side opposite to the engaging portion of the connection portion, and the one end portion of this body portion is the end opposite to the engaging portion of the connection portion. It is fixed to the part by crimping. Further, the body portion may be fixed to the connection portion by a C-shaped retaining ring. As such a configuration, for example, a C-shaped retaining ring is attached to the outer peripheral surface of the end opposite to the engaging portion of the connecting portion, and the C-shaped retaining ring is elastically deformed so that the outer diameter of the C-shaped retaining ring is reduced. The structure by which the edge part on the opposite side to the latching | locking part of a connection part is inserted in the one end part of a trunk | drum in the state made small is mentioned. In this case, the C-shaped retaining ring is located between the inner peripheral surface of the trunk portion and the outer peripheral surface of the connection portion. The outer peripheral surface of the C-shaped retaining ring is pressed against the inner peripheral surface of the trunk by the elastic force of the C-shaped retaining ring, and the trunk is brought into contact with the connecting portion by the frictional force between the C-shaped retaining ring and the trunk. Fixed.

  The trunk portion 12 has a small-diameter portion 21 at which the inner diameter of the trunk portion 12 is minimized with a predetermined interval from one end portion fixed to the connection portion 15 of the head portion 11 to the other end side. The inner diameter of the small diameter portion 21 is substantially the same as the diameter of the main shaft 30. A cutout 22 is formed in the body portion 12 along the extending direction from the end opposite to the head portion 11 to the small diameter portion 21. The notch 22 is located on one side in a direction perpendicular to the extending direction of the body portion 12 when viewed from the cylinder axis direction of the locking portion 14. The notch 22 only needs to be formed from the end opposite to the head 11 to a predetermined portion, and the notch 22 does not have to extend to the small diameter portion 21.

  The main shaft 30 of the present embodiment is a columnar member and has elasticity against torque within a predetermined range in the radial direction of the main shaft 30. The main shaft 30 is inserted into the trunk portion 12 so that the axis of the main shaft 30 substantially coincides with the cylinder axis of the trunk portion 12, and can move in the axial direction of the main shaft 30 and rotate around the axis of the main shaft 30. The body 12 is held. Specifically, the diameter of the main shaft 30 is substantially the same as the inner diameter of the small diameter portion 21 of the trunk portion 12, and the main shaft 30 is inserted into the small diameter portion 21 and supported by the small diameter portion 21. The diameter of the main shaft 30 is set to be smaller than the width of the notch 22 of the body 12, that is, the width in the direction substantially perpendicular to the extending direction of the body 12. In other words, the width of the notch 22 of the body 12 is larger than the diameter of the main shaft 30.

  An end portion of the main shaft 30 opposite to the head portion 11 protrudes from the end of the trunk portion 12 opposite to the head portion 11, and a knob portion 31 is fixed to this end portion. Of the surface of the knob portion 31, arrows 32 are formed on the surfaces on both sides of the locking portion 14 in the cylinder axis direction. This arrow 32 shows the direction of the nail | claw part in the pin mentioned later, and has shown the side in which the notch 22 is located in the state shown by FIG. The arrow 32 may be formed by printing or may be formed by engraving.

  On the other hand, the end on the head 11 side of the main shaft 30 is located inside the connecting portion 15 beyond the small diameter portion 21, and a substantially cylindrical pin 33 extending in the axial direction of the main shaft 30 is provided at this end. Fixed. The pin 33 is connected in order from the main shaft 30 side to the large diameter portion 34 in which the diameter of the pin 33 is substantially the same as the inner diameter of the large diameter portion 17 of the connection portion 15, and the diameter is connected to the large diameter portion 34. A small-diameter portion 35 substantially the same as the inner diameter of the 15 small-diameter portions 16. Such a pin 33 is inserted into the connecting portion 15, and in the state shown in FIG. 2, the large diameter portion 34 is located at the large diameter portion 17 of the connecting portion 15, and the small diameter portion 35 is located at the small diameter portion 16 of the connecting portion 15. doing. The small diameter portion 35 has a claw portion 36 at the tip portion. The claw portion 36 is formed by cutting the outer periphery on both sides of the small diameter portion 35 in the direction perpendicular to the extending direction of the body portion 12 as viewed from the cylinder axis direction of the locking portion 14 to the tip along the extending direction. The surfaces of the notched portions are substantially parallel to each other. That is, the claw portion 36 is a tip portion of the pin 33 and is a portion whose width in the direction perpendicular to the extending direction of the trunk portion 12 as viewed from the cylinder axis direction of the locking portion 14 is narrowed, as shown in FIG. In the state, it extends so as to avoid the protrusion 18 protruding from the inner peripheral surface of the small diameter portion 16. For this reason, as shown in FIG. 2, when the claw portion 36 extends beyond the protrusion 18 toward the locking portion 14, when the main shaft 30 is rotated around the axis of the main shaft 30, the claw portion 36 and the protrusion 18 are in contact with each other, and this rotation is suppressed. The claw portion 36 includes an inclined surface 37 that is inclined with respect to the axial direction so as to be tapered as viewed from the cylinder axis direction of the locking portion 14, and an engagement surface 38 that is substantially parallel to the axial direction. In the state shown in FIG. 2, the engaging surface 38 is located on the side where the notch 22 is positioned with respect to the inclined surface 37 when viewed from the cylinder axis direction of the locking portion 14. The tip portion of the claw portion 36 having the inclined surface 37 and the engaging surface 38 protrudes from the opening 14H of the locking portion 14 into the housing portion 19. The arrow 32 in the knob 31 indicates the side where the engaging surface 38 is located with respect to the inclined surface 37. In the state shown in FIGS. 1 and 2, the notch 22 is the side where the engaging surface 38 is located. The side where is located.

  The coil spring 23 according to the present embodiment is an elastic body made of a wire wound in a spiral shape, and is an internal space of the body portion 12 between the small diameter portion 21 of the body portion 12 and the pin 33 of the main shaft 30. It is arranged so that it can contract in the space. The main shaft 30 is inserted into the coil spring 23, one end of the coil spring 23 abuts on the small diameter portion 21, and the other end abuts on the pin 33. The main shaft 30 held by the body portion 12 is urged toward the head portion 11 by the elastic force of the coil spring 23. In the state shown in FIG. 2, the end of the large diameter portion 34 of the pin 33 on the small diameter portion 35 side is The small diameter portion 16 of the connecting portion 15 is in contact with the end on the large diameter portion 17 side. The spring constant and size of the coil spring 23 can be set as appropriate. Further, in the space between the small diameter portion 21 of the trunk portion 12 where the coil spring 23 is disposed and the pin 33 of the main shaft 30, the tip of the claw portion 36 can be positioned closer to the trunk portion 12 than the protrusion 18. Formed as follows. When the main shaft 30 is moved so that the tip of the claw portion 36 is positioned on the body 12 side with respect to the protrusion 18, the main shaft 30 can be rotated around the axis of the main shaft 30.

  The scale part 40 of this embodiment has a base 41 and a scale 42. The base portion 41 of the present embodiment is fixed to the end of the body portion 12 opposite to the head portion 11 and extends beyond the body portion 12 from the body portion 12 to the side where the notch 22 is located. The shape of the base 41 viewed from the cylinder axis direction of the locking portion 14 is a generally arc shape that curves convexly toward the side opposite to the head 11. Note that the shape of the base 41 may be linear. The base 41 has a through-hole 41 </ b> H penetrating in the extending direction of the body 12 from one end to the other end in a direction perpendicular to the extending direction of the body 12 as viewed from the cylinder axis direction of the locking portion 14. The main shaft 30 is inserted through the through hole 41H. The width of the through hole 41 </ b> H in the cylinder axis direction of the locking portion 14 is substantially the same as the width of the notch 22. Scales 42 are formed on both surfaces of the locking portion 14 in the cylinder axis direction among the surfaces of the base portion 41. The scale 42 may be formed by printing or may be formed by marking.

  FIG. 4 is a front view showing an example of a tool locked to the surgical torque wrench of FIG. As shown in FIG. 4, the tool 50 locked to the surgical torque wrench of this embodiment is a substantially cylindrical member, and a tool body 51 and a tool body in which the diameter of the tool 50 is minimized. 51 and a tool head 52 having a diameter that is larger than the diameter of the tool body 51. The diameter of the tool head 52 is substantially the same as the inner diameter of the locking portion 14. The end of the tool body 51 opposite to the tool head 52 has a recess 53 that is recessed in the axial direction of the tool body 51, and the head of the screw 60 is fitted into the recess 53 so that the screw 60 is Connected to the tool 50. Further, an end of the tool head 52 on the side of the tool body 51 is provided with an annular flange 54 that protrudes in the radial direction from the outer peripheral surface, and a predetermined interval from the flange 54 to the side opposite to the tool body 51. And an annular protrusion 55 protruding in the radial direction from the outer peripheral surface. A plurality of grooves 56 extending in the axial direction of the tool head 52 are formed at substantially equal intervals in the circumferential direction on the outer peripheral surface opposite to the tool body 51 from the protrusion 55.

  In addition, the material which comprises each member of the surgical torque wrench 1 is not specifically limited. From the viewpoint of productivity, durability, etc., as a material constituting the head 11, the body 12, the lock nut 13, the main shaft 30, the knob 31, the pin 33, etc., for example, titanium, titanium alloy, stainless steel, aluminum, carbon Mention may be made of metals such as steel.

  Next, tightening of the screw 60 by the surgical torque wrench 1 will be described.

  5 is a view showing a state where the tool is locked to the surgical torque wrench of FIG. 1 from the same viewpoint as FIG. 2, and FIG. 6 is a view showing a state where the tool is locked to the surgical torque wrench of FIG. 3 is a diagram showing the same viewpoint as FIG. 5 and 6 are enlarged views of the vicinity of the head. As shown in FIGS. 5 and 6, the user connects the tool 50 to the head 11 of the main body 10. Specifically, the user inserts the tool head 52 of the tool 50 into the accommodating portion 19 that is a space surrounded by the locking portion 14, and flexes the protrusion 55 of the tool head 52 to engage the protrusion 55. It engages with an annular groove 20 formed on the inner peripheral surface of the stopper 14. In this way, the tool head 52 of the receiving portion 19 is received and the protrusion 55 is engaged with the groove 20, so that the tool 50 is locked so that it can rotate around the cylinder axis of the locking portion 14. Locked to the portion 14. When the protrusion 55 is bent and the engagement between the protrusion 55 and the groove 20 is released, the tool 50 is removed from the locking portion 14. Since the groove 20 of the locking portion 14 is formed at both ends of the locking portion 14 in the cylinder axis direction, the tool head 52 is inserted into the housing portion 19 from either side of the locking portion 14 in the cylinder axis direction. The tool 50 can be locked to the locking portion 14 even if it is inserted into the locking portion 14.

  By the way, as described above, the tip of the claw portion 36 of the main shaft 30 protrudes from the opening 14 </ b> H of the locking portion 14 into the accommodating portion 19 of the locking portion 14. The tip of the claw 36 is engaged with one of a plurality of grooves 56 formed in the tool head 52 so that the cylinder of the locking portion 14 of the tool 50 locked to the locking portion 14 is obtained. The rotation about the axis is suppressed, and the tool 50 is connected to the head 11. Specifically, for example, the user picks the knob portion 31 of the main shaft 30 and pulls the main shaft 30 in the axial direction of the main shaft 30 opposite to the head portion 11, and the tip of the claw portion 36 moves to the housing portion 19. Let it not protrude. Next, the user rotates the surgical torque wrench 1 about the tool 50 with respect to the tool 50 so that the extending direction of the surgical torque wrench 1 with respect to the tool 50 is a desired direction, and the main shaft 30 is pulled. Solve. Since a biasing force that biases the main shaft 30 toward the head 11 is applied to the main shaft 30 by the coil spring 23, the tip of the claw portion 36 of the main shaft 30 is pressed against the outer peripheral surface of the tool head 52. . In this state, the surgical torque wrench 1 is rotated with respect to the tool 50, and the tip of the claw portion 36 is positioned on the groove 56 of the tool head 52. The tip of the claw portion 36 located on the groove 56 is pushed into the groove 56 by the biasing force of the coil spring 23.

  Next, in a state where the tip of the claw portion 36 is pushed into the groove 56, the user applies a force to the knob 31 of the main shaft 30 so that the main shaft 30 bends to the side where the notch 22 is located. That is, the user applies a torque in the clockwise direction about the tool 50 in FIG. As described above, since the main shaft 30 is held by the body portion 12, when torque is applied to the main shaft 30, this torque is transmitted to the main body 10. Specifically, this torque is transmitted to the small diameter portion 21 of the trunk portion 12 that supports the main shaft 30. At this time, the engaging surface 38 of the claw 36 abuts against the inner surface of the groove 56 of the tool head 52, the claw 36 is engaged with the groove 56, the tool 50 is connected to the head 11, and the tool 50 The screw 60 to be connected is also connected to the head 11. For this reason, torque is applied to the screw 60 via the tool 50 connected to the head 11, and the screw 60 can be tightened by this torque.

  By the way, as described above, the main shaft 30 has elasticity with respect to torque within a predetermined range in the radial direction of the main shaft 30, so that the main shaft 30 is bent with respect to the trunk portion 12 by the torque applied to the main shaft 30. The portion where the main shaft 30 is curved is generally a portion closer to the knob portion 31 than the small-diameter portion 21 of the trunk portion 12, and an example of the state of the curved main shaft 30 is indicated by a broken line in FIG. 2. A notch 22 is formed in the cylindrical body 12 from the end opposite to the head 11 to the small diameter portion 21 along the extending direction. The width of the notch 22 is larger than the diameter of the main shaft 30. It is considered large. For this reason, when the main shaft 30 is bent toward the side where the notch 22 is located with respect to the body portion 12, a part of the curved portion of the main shaft 30 protrudes from the notch 22 to the outside of the body portion 12. obtain.

  By the way, the scale 42 of the scale part 40 described above indicates the degree of bending of the main shaft 30 with respect to the extending direction of the body portion 12 when the main shaft 30 is bent toward the side where the notch 22 is located. . The degree of bending of the main shaft 30 can be obtained based on the torque applied to the main shaft 30, the material of the main shaft 30, the cross-sectional shape of the main shaft 30, the position where the main shaft 30 is supported, and the like. Further, the torque applied to the screw 60 via the tool 50 connected to the head 11 is added to the main shaft 30 when the main body 10 has rigidity that hardly deforms due to the torque applied to the main shaft 30. And the distance from the portion supporting the main shaft 30 to the locking portion 14 can be obtained. When the main body 10 is deformed, this deformation is also taken into consideration. Therefore, the torque applied to the screw 60 connected to the head 11 has a predetermined relationship with the degree of bending of the main shaft 30, and the torque applied to the screw 60 can be understood from the degree of bending of the main shaft 30. The scale 42 of the present embodiment indicates the torque applied to the screw 60 based on the degree of bending of the main shaft 30. Therefore, a desired torque can be applied to the screw 60 by applying torque to the main shaft 30 so that the position of the desired torque on the scale 42 and the bent main shaft 30 overlap, and the screw 60 is fastened with the desired torque. Can do.

  As described above, the surgical torque wrench 1 of the present embodiment includes the head 10 to which the screw 60 is coupled via the tool 50 and the main body 10 having the cylindrical body 12 extending from the head 11. The main shaft 30 that is elastic and is inserted into the body portion 12 and held by the body portion 12, and the scale portion 40 are provided. A cutout 22 having a width larger than the diameter of the main shaft 30 is formed in the body part 12 from the end opposite to the head part 11 to a predetermined position along the extending direction of the body part 12. . An end of the main shaft 30 opposite to the head 11 protrudes outward from an end of the trunk 12 opposite to the head 11. The scale portion 40 has a scale 42 that indicates the degree of bending of the main shaft 30 with respect to the extending direction of the body portion 12 when the main shaft 30 is bent on the side where the notch 22 is located.

  In this embodiment, since the main shaft 30 is held by the body portion 12, when torque is applied to the main shaft 30, the torque is transmitted to the main body 10. Therefore, the surgical torque wrench 1 can apply torque to the screw 60 via the tool 50 connected to the head 11 by torque applied to the main shaft 30, and can tighten the screw 60.

  In the present embodiment, the main shaft 30 has elasticity, and the scale portion 40 has a scale 42 indicating the degree of bending of the main shaft 30. Here, since the torque applied to the screw 60 connected to the head 11 has a predetermined relationship with the degree of bending of the main shaft 30 as described above, the torque applied to the screw 60 can be understood from the degree of bending of the main shaft 30. Therefore, the surgical torque wrench 1 can tighten the screw 60 with a desired torque.

  Moreover, in this embodiment, since the main axis | shaft 30 is inserted in the cylindrical trunk | drum 12, it can reduce in size compared with the case where the whole main axis is located in the exterior of a main body.

  In the present embodiment, as described above, the cylindrical body 12 has a notch 22 whose width is larger than the diameter of the main shaft 30 from the end opposite to the head 11. It is formed to a predetermined position along the extending direction. Therefore, when the main shaft 30 is bent toward the side where the notch 22 is positioned with respect to the body portion 12 as described above, a part of the curved portion of the main shaft 30 is removed from the notch 22 to the body portion 12. Can protrude outside. For this reason, it can suppress that the bending of the main axis | shaft 30 is prevented by the trunk | drum 12, Compared with the cylindrical trunk | drum where the notch is not formed, the outer diameter of the trunk | drum 12 can be made small, and the surgical torque wrench 1 Can be miniaturized. Moreover, it is easier to clean the inside of the body part 12 than a cylindrical body part in which notches are not formed.

  In the present embodiment, the main body 10 can be disassembled into a head portion 11 and a trunk portion 12. For this reason, the head part 11 and the trunk | drum 12 can be wash | cleaned separately, and the main body 10 becomes easy to wash | clean compared with the case where a main body cannot be decomposed | disassembled into a head part and a trunk | drum.

  Moreover, in this embodiment, the head 11 has the accommodating part 19 which accommodates the tool head 52 of the tool 50 with which the screw 60 is connected. A pin 33 is fixed to the end of the main shaft 30 on the head 11 side, and the tip of the claw 36 serving as the tip of the pin 33 extends from the opening 14 </ b> H of the locking portion 14 to the receiving portion of the locking portion 14. 19 protrudes. The main shaft 30 is movable in the axial direction of the main shaft 30. For this reason, by moving the main shaft 30 in the axial direction of the main shaft 30, the tip end portion of the claw portion 36 can be engaged with or released from the groove 56 of the tool head 52, The screw 60 can be connected to the head 11 by the main shaft 30, or the connection can be released. For this reason, the surgical torque wrench 1 is not provided with another member different from the main shaft 30, for example, the bolt rod in the surgical torque wrench described in Patent Document 1, and the locking portion 14 of the head 11 of the main body 10. The screw 60 can be connected to or disconnected. Therefore, the surgical torque wrench 1 can be made simpler than when the screw is connected to the head of the main body by another member different from the main shaft. In addition, since the tool head 52 of the tool 50 has a plurality of grooves 56, the user can remove the tool 50 from the accommodating portion 19 of the locking portion 14 of the head 11 without using the surgical torque wrench 1 for the tool 50. Since the extending direction can be changed, operability can be improved.

  In the present embodiment, a pin 33 is fixed to the end of the main shaft 30 on the head 11 side, and the front end of the claw 36 that is the front end of the pin 33 is tapered. The inclined surface 37 is inclined with respect to the axial direction. Since the force applied to the inclined surface 37 of the claw portion 36 acts on the radial direction and the axial direction of the main shaft 30 as described above, the main shaft 30 can move in the axial direction by the axial force. For this reason, when torque is applied to the surgical torque wrench 1, when the edge of the groove 56 of the tool head 52 abuts against the inclined surface 37 and a force is applied to the inclined surface 37, that is, in FIG. When torque in the counterclockwise direction centered on 50 is applied to the surgical torque wrench 1, the main shaft 30 moves in the axial direction and the claw portion 36 is removed from the groove 56. The engagement is released and no torque is applied to the screw 60. In this manner, in the present embodiment, it is possible to prevent the torque from being applied to the screw in accordance with how to apply the torque to the surgical torque wrench 1.

  Further, in the present embodiment, when the main shaft 30 is moved so that the tip of the claw portion 36 is positioned on the body 12 side with respect to the protrusion 18 as described above, the main shaft 30 is moved to the axis of the main shaft 30. Can be rotated as a center. For example, in the state shown in FIG. 5, the main shaft 30 is rotated about 180 ° around the axis of the main shaft 30 to reverse the positional relationship between the inclined surface 37 and the engaging surface 38 with respect to the groove 56 of the tool head 52. . In this state, when applying torque in the clockwise direction around the tool 50 to the surgical torque wrench 1, the edge of the groove 56 of the tool head 52 contacts the inclined surface 37, and The engagement of the engagement portion between the tip portion and the groove 56 of the tool head 52 is released, and torque is not applied to the screw 60. On the other hand, in this state, when a torque in the counterclockwise direction around the tool 50 is applied to the surgical torque wrench 1, the engaging surface 38 of the claw 36 is the inner surface of the groove 56 of the tool head 52. , And the engagement between the claw portion 36 and the groove 56 is not released, and torque is applied to the screw 60. Thus, in this embodiment, since the user can change how to apply torque to the screw 60 without removing the tool 50 from the accommodating portion 19 of the head 11, the operability is good. Can be.

  In the present embodiment, the main body 10 includes a coil spring 23 as an elastic body that biases the main shaft 30 toward the head 11. For this reason, since the nail | claw part 36 can be engaged with the groove | channel 56 even if a user does not move the main axis | shaft 30 to the head 11 side, operativity can be made favorable.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIGS. In addition, about the component which is the same as that of 1st Embodiment, or equivalent, except the case where it demonstrates especially, the same referential mark is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 7 is a diagram showing the surgical torque wrench according to the present embodiment from the same viewpoint as FIG. 1, and FIG. 8 is a diagram showing the surgical torque wrench according to the present embodiment from the same viewpoint as FIG. As shown in FIGS. 7 and 8, the surgical torque wrench 1 of the present embodiment has a point where the main shaft 30 is fixed to the body portion 12, a point where the main shaft 30 and the pin 33 are separated, and a scale portion 40. It differs from the surgical torque wrench 1 of the first embodiment in that it is fixed to the main shaft 30. The surgical torque wrench 1 of this embodiment includes a main body 10, a main shaft 30, and a scale portion 40 as main components.

  The main body 10 of this embodiment includes a head 11, a body 12, a lock nut 13, a coil spring 23, and a pin 33 as main components. The trunk portion 12 of the present embodiment includes a holding portion 25 in which the inside of the trunk portion 12 is solid instead of the small diameter portion 21 of the trunk portion 12 in the first embodiment. It is fixed to the connection part 15. A cutout 22 is formed in the body portion 12 along the extending direction from the end opposite to the head 11 side to the holding portion 25. Further, marks 26 are formed on both surfaces of the locking portion 14 in the cylinder axis direction among the surfaces of the end portion of the body portion 12 opposite to the head 11 side. The mark 26 may be formed by printing or may be formed by marking.

  Unlike the pin 33 of the first embodiment described above, the pin 33 of the present embodiment is inserted into the connecting portion 15 in that the pin 33 is not fixed to the main shaft 30 as described above, so that the pin 33 can move in the axial direction of the pin 33. Supported by the portion 15. In the state shown in FIG. 8, the large diameter portion 34 is located in the large diameter portion 17 of the connection portion 15, and the small diameter portion 35 is located in the small diameter portion 16 of the connection portion 15. The small-diameter portion 35 has a claw portion 36 at the tip portion in the same manner as the pin 33 of the first embodiment. The claw portion 36 has an inclined surface 37 and an engagement surface 38, and the tip portion of the claw portion 36 protrudes from the opening 14 </ b> H of the locking portion 14 into the housing portion 19.

  The coil spring 23 according to the first embodiment is arranged such that the coil spring 23 can contract in a space between the holding portion 25 of the body portion 12 and the pin 33 inserted into the connection portion 15. And different. The pin 33 is urged toward the locking portion 14 by the elastic force of the coil spring 23, and in the state shown in FIG. 8, the large-diameter portion 34 of the pin 33 contacts the small-diameter portion 16 of the connecting portion 15. ing. In the space between the holding portion 25 of the trunk portion 12 where the coil spring 23 is disposed and the pin 33, the tip of the claw portion 36 may be located closer to the connecting portion 15 than the opening 14 </ b> H of the locking portion 14. In addition, the tip of the claw portion 36 is formed so as not to be positioned closer to the body portion 12 than the protrusion 18.

  The main shaft 30 of the present embodiment is different from the main shaft 30 of the first embodiment in that the main shaft 30 is fixed to the body portion 12 as described above. The main shaft 30 of the present embodiment is inserted into the body portion 12 so that the axis of the main shaft 30 substantially coincides with the cylinder axis of the body portion 12, and the end portion on the head 11 side of the main shaft 30 is held by the body portion 12. It is fixed to the part 25.

  The scale part 40 of this embodiment differs from the scale part 40 of the said 1st Embodiment in the point fixed to the main axis | shaft 30 as mentioned above. The base portion 41 of the scale portion 40 of the present embodiment is the main shaft 30 and is fixed to a portion between the end of the body portion 12 opposite to the head portion 11 and the knob portion 31. The base 41 is a plate-like member, is adjacent to the end of the body 12 opposite to the head 11, and extends from the main shaft 30 to the side opposite to the side where the notch 22 of the body 12 is located, beyond the body 12. Extend. The shape of the base 41 viewed from the cylinder axis direction of the locking portion 14 is a generally arc shape that curves convexly toward the side opposite to the head 11. Scales 42 are formed on both surfaces of the locking portion 14 in the cylinder axis direction among the surfaces of the base portion 41.

  In the present embodiment, similarly to the first embodiment, the user inserts the tool head 52 of the tool 50 into the accommodating portion 19 of the locking portion 14 in the head 11, and the protrusion 55 of the tool head 52. Is engaged with the groove 20 of the locking portion 14.

  Next, the user rotates the surgical torque wrench 1 with respect to the tool 50 around the tool 50, and positions the tip of the claw 36 on the groove 56 of the tool head 52. The tip of the claw portion 36 located on the groove 56 is pushed into the groove 56 by the biasing force of the coil spring 23.

  Next, in a state where the tip portion of the claw portion 36 is pushed into the groove 56, the user applies a force to the knob portion 31 of the main shaft 30 so that the main shaft 30 bends to the side where the notch 22 is located, that is, In FIG. 8, torque in the clockwise direction around the tool 50 is applied to the main shaft 30. As described above, since the main shaft 30 is fixed to the holding portion 25 of the trunk portion 12, this torque applied to the main shaft 30 is transmitted to the main body 10. At this time, the engaging surface 38 of the claw portion 36 comes into contact with the inner surface of the groove 56 of the tool head 52, the claw portion 36 is engaged with the groove 56, and the tool 50 is connected to the head portion 11 of the main body 10. The screw 60 connected to 50 is also connected to the head 11 of the main body 10. For this reason, in the present embodiment, as in the first embodiment, torque is applied to the screw 60 via the tool 50 connected to the head portion 11 of the main body 10, and the screw 60 is tightened by this torque.

  As described above, the main shaft 30 has elasticity with respect to the torque within a predetermined range in the radial direction of the main shaft 30, so that the main shaft 30 is bent with respect to the trunk portion 12 by the torque applied to the main shaft 30, and this main shaft The scale portion 40 fixed to 30 moves together with the main shaft 30 with respect to the trunk portion 12. In FIG. 8, an example of the state of the curved main shaft 30 is indicated by a broken line. By the way, the shape of the base part 41 seen from the cylinder axis direction of the locking part 14 described above is such that the edge of the base part 41 side of the base part 41 is along the end opposite to the head part 11 of the base part 12 during this movement. As shown in FIG. Since the notch 22 whose width is larger than the diameter of the main shaft 30 is formed in the cylindrical body portion 12, a part of the curved portion of the main shaft 30 can be part of the body portion 12 from the notch 22. Can protrude outside. For this reason, it can suppress that the bending of the main axis | shaft 30 is prevented by the trunk | drum 12, Compared with the cylindrical trunk | drum where the notch is not formed, the outer diameter of the trunk | drum 12 can be made small, and the surgical torque wrench 1 Can be miniaturized. Moreover, it is easier to clean the inside of the body part 12 than a cylindrical body part in which notches are not formed.

  By the way, the scale 42 of the scale portion 40 is similar to the first embodiment in that the main shaft 30 is based on the extending direction of the body portion 12 when the main shaft 30 is bent on the side where the notch 22 is located. The degree of bending is indicated, and is formed with reference to a mark 26 formed on the body portion 12. As described above, since the torque applied to the screw 60 connected to the head 11 has a predetermined relationship with the degree of bending of the main shaft 30, the torque applied to the screw 60 can be understood from the degree of bending of the main shaft 30. The scale 42 of the present embodiment indicates the torque applied to the screw 60 based on the degree of bending of the main shaft 30. Therefore, in the present embodiment, in the same manner as in the first embodiment, by applying torque to the main shaft 30 so that the position indicating the desired torque on the scale 42 and the mark 26 of the trunk portion 12 as a reference overlap each other, A desired torque can be applied to the screw 60 and the screw 60 can be fastened with the desired torque.

  Further, in the present embodiment, since the main shaft 30 is inserted into the cylindrical body 12 in the same manner as in the first embodiment, the size can be reduced as compared with the case where the entire main shaft is located outside the main body. .

  Further, in the present embodiment, the main body 10 can be disassembled into a head portion 11 and a trunk portion 12 as in the first embodiment. For this reason, the head part 11 and the trunk | drum 12 can be wash | cleaned separately, and the main body 10 becomes easy to wash | clean compared with the case where a main body cannot be decomposed | disassembled into a head part and a trunk | drum.

  Further, in the present embodiment, the head 11 has the accommodating portion 19 that accommodates the tool head 52 of the tool 50. Further, the main body 10 has a pin 33 to be inserted into the connection portion 15 of the head 11, and the tip portion of the claw portion 36 which is the tip portion of the pin 33 has an inclined surface 37 and an engagement surface 38. And it protrudes from the opening 14 </ b> H of the locking portion 14 to the accommodating portion 19 of the locking portion 14. Since the force applied to the inclined surface 37 of the claw portion 36 acts in the radial direction and the axial direction of the pin 33, the pin 33 can move in the axial direction by the axial force. When the torque is applied to the surgical torque wrench 1 and the edge of the groove 56 of the tool head 52 abuts against the inclined surface 37 and a force is applied to the inclined surface 37, that is, the tool 50 is centered in FIG. When the torque in the counterclockwise direction is applied to the surgical torque wrench 1, the pin 33 moves in the axial direction and the claw portion 36 is removed from the groove 56. For this reason, the engagement between the claw portion 36 and the groove 56 is released, and torque is not applied to the screw 60. In this manner, in the present embodiment, it is possible to prevent the torque from being applied to the screw in accordance with how to apply the torque to the surgical torque wrench 1 as in the first embodiment.

  As mentioned above, although this invention was demonstrated to the example for embodiment, this invention is not limited to these.

  For example, in the above-described embodiment, the cylindrical body portion 12 has been described as an example. However, the body portion 12 may be cylindrical, and the shape of the cross section perpendicular to the longitudinal direction of the body portion 12 is not particularly limited. In the above embodiment, the columnar main shaft 30 has been described as an example, but the shape of the cross section perpendicular to the longitudinal direction of the main shaft 30 is not particularly limited. However, the minimum width of the outer shape in the cross section perpendicular to the longitudinal direction of the main shaft 30 is larger than the width of the notch so that the main shaft 30 can protrude from the notch 22 formed in the body portion 12 to the outside of the body portion 12. Small. The minimum width of the outer shape in the cross section perpendicular to the longitudinal direction of the main shaft is, for example, the diameter when the outer shape of the cross section in the cross section perpendicular to the longitudinal direction of the main shaft is substantially circular as in the above-described embodiment, When the outer shape of the cross section is approximately polygonal, it is set to the minimum distance among the distances between the opposite sides.

  In the above embodiment, the main body 10 that can be disassembled into the head 11 and the trunk 12 has been described as an example. However, the main body 10 may not be disassembled into the head 11 and the trunk 12. However, from the viewpoint of facilitating cleaning of the main body, it is preferable that the main body can be disassembled into a head portion and a trunk portion.

  In the first embodiment, the main body 10 including the coil spring 23 that is an elastic body that biases the main shaft 30 toward the head 11 is described as an example. However, the main body 10 is such an elastic body. The coil spring 23 may not be provided. However, from the viewpoint of operability, the main body preferably includes such an elastic body.

  Moreover, in the said 1st Embodiment, the scale part 40 was attached to the trunk | drum 12, and the scale part 40 was attached to the main axis | shaft 30 in the said 2nd Embodiment. However, the scale portion 40 may be attached to the main shaft 30 in the same manner as in the second embodiment in the first embodiment. In the second embodiment, the scale portion 40 may be attached to the trunk portion 12 in the same manner as in the first embodiment. It may be attached.

  In the first embodiment, the knob 31 and the pin 33 are respectively fixed to the main shaft 30. In the second embodiment, the knob 31 is fixed to the main shaft 30. However, in the surgical torque wrench 1, the main shaft 30 and the knob 31 or the main shaft 30 and the pin 33 may be formed integrally with each other.

  Moreover, in the said embodiment, although the head 11 to which the screw 60 is connected via the tool 50 was demonstrated to the example, the head should just be able to connect a screw, and the structure of a head is not specifically limited. . In the above embodiment, the tool head 52 of the tool 50 is accommodated in the accommodating portion 19 of the locking portion 14 of the head 11, and the tool 50 is coupled to the head 11. However, the head does not have to have a receiving portion.For example, when the head has a protrusion and the tool has a groove corresponding to the protrusion, the groove of the tool is fitted into the protrusion on the head. You may connect a screw | thread to a head via a tool by combining. In the case where the head has a housing portion, it is sufficient that at least a part of the screw or at least a part of the tool to which the screw is connected is housed in the housing portion. For example, in the above embodiment, the locking portion 14 of the head 11 is formed in a cylindrical shape having openings at both ends, but the locking portion may be formed in a cylindrical shape in which the opening at one end is closed, for example. good. In the above embodiment, the claw portions 36 of the pin 33 are engaged with the plurality of grooves 56 as the engaging portions formed on the tool head 52 of the tool 50, and the screw 60 is connected to the head 11. . However, the engaging portion with which the pin 33 engages is not limited to the groove. For example, the claw portion 36 of the pin 33 may be engaged with a plurality of protrusions formed on the tool head, and the screw 60 may be connected to the head 11. Moreover, in the said embodiment, although the latching | locking part 14 of the head 11 was formed in the cylindrical shape, the shape of the cross section perpendicular | vertical to a longitudinal direction may be formed in the cylinder shape of C shape, for example. The head may be one to which a screw is directly connected. When the screw is directly connected to the head, for example, in the same manner as the tool head 52 of the tool 50, a plurality of grooves are formed in the head of the screw, and the inner diameter of the locking portion of the head is set to the screw head. It may be substantially the same as the outer diameter of the head, and the screw head may be inserted into the locking portion so that the screw is directly connected to the head. Further, when the screw head or the tool head of the tool has a polygonal column shape, for example, the shape of the cross section perpendicular to the longitudinal direction of the locking portion of the head is a polygonal shape corresponding to these polygonal columns. It may be formed in a cylindrical shape, and a screw head or a tool head of a tool may be inserted into the locking portion to connect the screw or tool to the head. Moreover, in the said embodiment, although the head 11 had the latching | locking part 14 and the connection part 15, the head does not need to have the connection part 15, for example, the end of a trunk | drum is screwed together. It may be attached to the locking portion by, for example.

  ADVANTAGE OF THE INVENTION According to this invention, the surgical torque wrench which is easy to wash | clean while reducing in size is provided and can be utilized in field | areas, such as dentistry.

DESCRIPTION OF SYMBOLS 1 ... Surgical torque wrench 10 ... Main body 11 ... Head 12 ... Body part 13 ... Lock nut 14 ... Locking part 15 ... Connection part 19 ... Accommodating part 22 ... Notch 23 ... Coil spring 30 ... Main shaft 33 ... Pin 36 ... Claw part 37 ... Inclined surface 38 ... Engagement surface 40 ... Scale part 42 ... ·scale

Claims (7)

A main body having a head to which a screw is connected and a cylindrical trunk extending from the head;
A main shaft that has elasticity and is inserted into the body part and held by the body part;
The scale,
With
The body portion has a notch whose width is larger than the minimum width of the outer shape in a cross section perpendicular to the longitudinal direction of the main shaft along the extending direction of the body portion from the end opposite to the head portion. To a predetermined position,
The end of the main shaft opposite to the head protrudes outward from the end of the trunk opposite to the head,
The scale portion has a scale indicating a degree of bending of the main shaft with respect to an extending direction of the trunk portion when the main shaft is bent toward the side where the notch is located. A wrench. The surgical torque wrench according to claim 1, wherein the main body can be disassembled into the head and the body. The surgical torque wrench according to claim 1 or 2, wherein the scale portion is attached to the body portion. The surgical torque wrench according to claim 1 or 2, wherein the scale portion is attached to the main shaft. The head has a housing portion that houses at least a part of the screw or at least a part of a tool to which the screw is connected,
The surgical torque wrench according to any one of claims 1 to 4, wherein the main shaft extends to the housing portion and is movable in an axial direction of the main shaft. The main shaft is rotatable around the axis of the main shaft,
The end of the main shaft on the head side has an inclined surface inclined with respect to the axial direction so as to be tapered toward the head of the main shaft. Surgical torque wrench. The surgical torque wrench according to claim 5 or 6, wherein the main body further includes an elastic body that urges the main shaft toward the head.

Images