JP2015053945A - Surgical instrument and surgical instrument system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surgical instrument capable of reducing a cost, facilitating surgical instrument selection work in a pre-surgery conference and preparations for surgery, suppressing the deterioration of surgical efficiency, and acquiring an optimal shape in a surgery site during surgery.SOLUTION: A surgical instrument 11 has a bent part 11a at the end part, which is bent and inserted into a human body during surgery. In the surgical instrument 11, at least the bent part 11a is formed of a shape memory alloy.

Description

  The present invention relates to a surgical instrument used during surgery such as forceps, a lever, or a scissors. The present invention also relates to a surgical instrument system including such a surgical instrument.

  When performing an operation, various surgical instruments such as forceps, a forceps (tweezers), or a scissors are used. A scissors is a device whose end is bent like a hook, and is used when a tissue is taken out from the body by being hooked on the tissue inside the patient's body. Forceps and a lever are used when grasping a tissue in a patient's body, and a forceps or a lever whose tip is bent is also used during surgery. Surgical instruments are required to have a predetermined rigidity, and surgical instruments after surgery must be cleaned and sterilized in high-pressure steam. Therefore, surgical instruments are generally made of stainless steel, titanium alloy, etc. It is made of a metal material with little biotoxicity. Note that a forceps whose tip is bent is disclosed in Patent Document 1, for example.

JP 2001-245893 A

  Surgical instruments used during surgery vary depending on the location, extent and condition of the disease on which the surgery is performed. In addition, there are various surgical methods for the same disease, and different surgical instruments are used depending on the surgical method employed in the operation. Furthermore, there are surgical instruments that are easy to use and difficult to use depending on the surgeon even when performing the same surgical procedure. Therefore, there are a great variety of surgical instruments. For example, there are a great many types of scissors used at the time of surgery with different shapes and curvatures of bent portions at the ends. In addition, as forceps and levers used at the time of surgery, there are a great many types of forceps and levers having different shapes and curvatures of the bent portion of the tip.

  Therefore, in hospitals, it is necessary to purchase and store very many types of scissors, forceps and the like having different bent portion shapes and curvatures, increasing initial purchase costs and management costs after purchase. Prior to surgery, it is necessary to select scissors, forceps, etc. to be used in the surgery at the prior conference. However, if there are very many types of scissors, forceps, etc., the selection work at the prior conference becomes complicated. Become. In addition, since a relatively large number of types of scissors, forceps, and the like are selected at the preliminary conference so that the scissors, forceps, and the like necessary at the time of the operation are not present at the surgery site, preparation for surgery becomes complicated.

  Furthermore, even if a relatively large number of types of scissors, forceps, etc. are prepared, there are cases where there are no scissors, forceps, etc. in the optimal shape that the surgeon wants to use depending on the actual surgical situation. In this case, during the operation, the optimal shape of the scissors, forceps and the like from the material chamber where the scissors, forceps and the like are stored also occurs at the operation site, and the efficiency of the operation is reduced. In addition, if there are relatively many types of scissors, forceps, and the like at the surgical site, the communication between the surgeon and the nurse taking out the instrument becomes complicated, and the efficiency of the operation is reduced.

  Also, during the actual operation, depending on the situation of the operation, use the optimally shaped scissors and forceps that have a bent portion with a shape different from the curvature and the curvature of the ready-made scissors and forceps Sometimes you want to. For example, depending on the situation of surgery, it may be desirable to use an optimally shaped fold having a bent portion with a different shape or curvature from a bent portion of a ready-made fold. In this case, the end of the spatula formed of a thin metal plate such as stainless steel is used by the surgeon by bending it into an optimal shape at the operation site during the operation. ing. Since the spatula used is reused, the bent spatula is returned to the original flat plate shape after the operation, but once bent, the spatula does not return to the full flat plate shape. This makes it difficult for the surgeon to use the reused spatula by bending it into an optimal shape. Further, if the spatula is bent repeatedly, the spatula may be hardened due to work hardening, and if the spatula breaks, it is necessary to purchase a new spatula, which increases the cost.

  Therefore, the problems of the present invention are to reduce the cost, facilitate the selection of surgical instruments and preparation for surgery at a prior conference, suppress the decrease in efficiency of surgery, and perform surgery during surgery. An object of the present invention is to provide a surgical instrument capable of obtaining an optimum shape on site. Moreover, the subject of this invention is providing the surgical instrument system provided with this surgical instrument.

  In order to solve the above-described problems, the surgical instrument of the present invention includes a bent portion inserted into the body and bent at the end during the operation, and at least the bent portion is formed of a shape memory alloy. It is characterized by that.

  In the surgical instrument of the present invention, the bent portion is formed of a shape memory alloy. That is, in this invention, the edge part of the surgical instrument which makes a bending part is formed with the shape memory alloy. Therefore, in the present invention, it is possible to prepare a surgical instrument required at the time of surgery by bending the end part of the surgical instrument and forming the bent part in a shape necessary for each surgery. In the present invention, since the end of the surgical instrument is formed of a shape memory alloy, for example, when the surgical instrument is cleaned and sterilized in high-pressure steam after surgery, It is possible to reliably return the end part to the original shape, and by bending the end part of the surgical instrument before the next operation, the bent part is formed into the shape required at the time of the operation. It becomes possible to prepare a surgical instrument required at the time of surgery. Further, the surgical instrument can be reused without breaking the end of the surgical instrument. Therefore, in the present invention, it is possible to perform surgical operation required at the time of surgery while reusing the surgical instrument without purchasing and storing a very large number of surgical instruments having different shapes and curvatures of the bent portions. The instrument can be prepared, and as a result, the initial purchase cost and the post-purchase management cost of the surgical instrument can be reduced.

  Further, in the present invention, since the end of the surgical instrument is bent and the bent portion is formed in a shape necessary for each operation, it becomes possible to prepare the surgical instrument necessary for the operation. It is possible to prepare an optimally-shaped surgical instrument that is not available in a commercial surgical instrument. Therefore, if the surgical instrument of the present invention is used, an optimal operation can be performed. In particular, in the present invention, since the end portion of the surgical instrument is formed of a shape memory alloy, it has a bent portion having a shape or curvature different from that of the prepared bent portion of the surgical instrument depending on the actual surgical situation. If the surgeon wants to use a surgical instrument, the end of the bent surgical instrument must be securely returned to its original shape and bend again at the surgical site during the operation. It is possible to form a bent portion. Therefore, in the present invention, it is possible to obtain an optimally shaped surgical instrument at the surgical site during surgery, and as a result, it is possible to perform a more optimal operation by using the surgical instrument of the present invention. become. In addition, since it is possible to obtain an optimally shaped surgical instrument at the surgical site, it is possible to suppress a reduction in the efficiency of the surgery.

  Furthermore, in the present invention, it is possible to prepare an optimally shaped surgical instrument by bending the end of the surgical instrument to form a bent portion, so that relatively few types of surgery are performed during surgery. All you need to do is prepare equipment. Therefore, preparation for surgery becomes easy. In addition, since there are relatively few types of surgical instruments to be prepared during surgery, communication between the surgeon and the nurse taking out the instrument during surgery is facilitated, reducing the reduction in surgical efficiency. It becomes possible to do. In addition, it is possible to prepare an optimally shaped surgical instrument by bending the end part of the surgical instrument to form a bent part, so it is possible to operate from a great variety of surgical instruments. There is no need to select the necessary surgical instruments at the prior conference. Therefore, it becomes easy to select a surgical instrument at a prior conference before surgery.

  In the present invention, it is preferable that the end portion of the surgical instrument that forms the bent portion returns to the original shape that is linear or planar when the shape recovery temperature of the shape memory alloy is reached. If constituted in this way, it is only necessary to bend the end of a surgical instrument formed linearly or flatly to form a bent part before surgery, etc., so that the bent part is formed into a shape required for surgery. Easy to form.

  In the present invention, the surgical instrument includes a bent portion forming portion where the bent portion is formed, and a base portion to which the bent portion forming portion is joined, the bent portion forming portion is formed of a shape memory alloy, It is preferably formed of a metal material other than the shape memory alloy. Since the price of shape memory alloy is high compared to other metal materials, this configuration reduces the cost of the surgical instrument compared to the case where the entire surgical instrument is formed of the shape memory alloy. It becomes possible to reduce.

  In the present invention, the bent portion forming portion and the base portion are preferably joined by shrink fitting, brazing, or screws. If comprised in this way, it will become possible to raise the joint strength of a bending part formation part and a base, and it will become possible to improve the heat resistance of the junction part of a bending part formation part and a base. Moreover, since the adhesive agent for joining a bending part formation part and a base is not used if comprised in this way, it becomes possible to comprise the surgical instrument with little biotoxicity.

  In the present invention, the shape recovery temperature of the shape memory alloy is preferably equal to or higher than human body temperature. If comprised in this way, even if a bending part is formed with the shape memory alloy, it becomes possible to prevent that the edge part of the surgical instrument used as the bending part returns to an original shape during a surgery.

  In the present invention, the shape recovery temperature of the shape memory alloy is preferably 50 ° C. or higher and 60 ° C. or lower. If comprised in this way, the end part (namely, bending part) of the surgical instrument which was bent in the surgery site by immersing the end part of the surgical instrument in the heated physiological saline during surgery, for example It becomes possible to reliably return to the original shape. Therefore, if the surgeon wants to use a surgical instrument having a bent part with a shape or curvature different from that of the prepared surgical instrument bent part according to the actual surgical situation, the surgical operation is performed during the operation. In the field, it is possible to relatively easily return the end portion of the surgical instrument that has been bent back to its original shape and then bend it again to form the optimally bent portion.

  In the present invention, the transformation start temperature of the shape memory alloy is preferably 0 ° C. or higher. If comprised in this way, it will become possible to make below the transformation start temperature the end part of the surgical instrument which has returned to the original shape comparatively easily in the operation site during an operation. Accordingly, it is possible to form an appropriate bent portion by bending the end portion of the surgical instrument that is equal to or lower than the transformation start temperature.

  In the present invention, the transformation start temperature of the shape memory alloy is preferably equal to or higher than human body temperature. If comprised in this way, even if the bending part is formed with the shape memory alloy, it becomes possible to prevent that the edge part of the surgical instrument used as the bending part deform | transforms during an operation.

  The surgical instrument of the present invention can be used in a surgical instrument system including a bending jig for bending the end portion of the surgical instrument to form a bent portion. In this surgical instrument system, it is possible to reduce the cost of surgical instruments, to facilitate the selection of surgical instruments and preparations for surgery at prior conferences, to suppress the reduction of surgical efficiency, and to surgery It becomes possible to obtain the optimum shape of the surgical instrument on site. Further, in this surgical instrument system, it is possible to form a bent portion by relatively easily bending the end portion of the surgical instrument that has returned to its original shape using a bending jig.

  As described above, in the present invention, it is possible to reduce the cost of surgical instruments, to facilitate selection of surgical instruments and preparation for surgery at a prior conference, to suppress a reduction in surgical efficiency, and It becomes possible to obtain the optimum shape of the surgical instrument at the operation site during the operation.

It is a top view of the surgical instrument concerning embodiment of this invention. It is a figure which shows the example of the shape of the front-end | tip part of a surgical instrument from the EE direction of FIG. It is an enlarged view of the F section of FIG. It is sectional drawing of the GG cross section of FIG. It is a perspective view of the surgical instrument concerning other embodiment of this invention. It is a perspective view which shows a state when the both ends of the surgical instrument shown in FIG. 5 are returning to the original shape.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Configuration of surgical instrument)
FIG. 1 is a plan view of a surgical instrument 1 according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of the shape of the distal end portion of the surgical instrument 1 from the EE direction of FIG. FIG. 3 is an enlarged view of a portion F in FIG. 4 is a cross-sectional view taken along the line GG in FIG.

  The surgical instrument 1 of this embodiment is a forceps used when grasping a tissue in a patient's body. Therefore, hereinafter, the surgical instrument 1 of this embodiment will be referred to as “forceps 1”. The distal end portion of the forceps 1 inserted into the body is a bent portion 1a that is bent. That is, the bent portion 1 a constitutes the distal end portion of the forceps 1. The forceps 1 includes a gripping portion 1b as a bending portion forming portion where the bending portion 1a is formed, and a base portion 1c to which the gripping portion 1b is joined. The grip portion 1 b constitutes the distal end portion of the forceps 1, and the base portion 1 c constitutes the proximal end portion of the forceps 1. The forceps 1 includes a connecting shaft 2 and a pair of forceps members 3 and 4 that are connected to each other by the connecting shaft 2 so as to be relatively rotatable.

  The grasping portion 1b is inserted into a patient's body and grasps tissue inside the body. The grip 1b is made of a shape memory alloy. Specifically, the grip 1b is formed of a shape memory alloy made of a nickel titanium alloy. The shape recovery temperature of this shape memory alloy is equal to or higher than human body temperature. Humans die if their body temperature exceeds 42 ° C. Therefore, the shape recovery temperature of this shape memory alloy is 42 ° C. or higher. Specifically, the shape recovery temperature of this shape memory alloy is 45 ° C. or higher. In this embodiment, the shape recovery temperature of this shape memory alloy is 50 ° C. or higher and 60 ° C. or lower. The transformation start temperature of this shape memory alloy is 0 ° C. or higher. The grip 1b may be formed of a shape memory alloy made of an alloy other than a nickel titanium alloy.

  The distal end portion of the grip portion 1b is a bent portion 1a. The bent portion 1a is formed in a shape required for the operation in which the forceps 1 is used. For example, as shown in any of FIGS. 2A, 2B, or 2C, the bent portion 1a is a curved line having a substantially quadratic curve when viewed from the EE direction in FIG. Is bent. The original shape of the distal end portion of the grip portion 1b (that is, the distal end portion of the forceps 1) is linear as shown in FIG. Therefore, when the temperature of the gripping portion 1b is equal to or higher than the shape recovery temperature, the distal end portion of the gripping portion 1b that is bent as shown in any of FIGS. 2A to 2C (that is, the bent portion 1a) As shown in FIG. 2D, the original shape is restored to a straight line. Further, a joined portion 1d joined to the base portion 1c is formed on the proximal end side of the grip portion 1b so as to protrude toward the base portion 1c. The bent portion 1a may be bent so that the shape when viewed from the EE direction in FIG. 1 is a shape other than a substantially quadratic curve.

  The base 1c is disposed between the connecting shaft 2, the two finger rings 1e that constitute the proximal end portion of the base 1c and into which the fingers of the surgeon performing the operation are inserted, and the connecting shaft 2 and the finger ring 1e. Arm 1f, and a joining portion 1g that is disposed on the distal end side of the base portion 1c with respect to the connecting shaft 2 and constitutes the distal end portion of the base portion 1c and to which the grip portion 1b is joined. The base 1c is made of a metal material other than the shape memory alloy. Specifically, the base 1c is formed of a metal material with little biotoxicity (or no biotoxicity). The base 1c of this embodiment is formed of stainless steel. The base 1c may be formed of a titanium alloy or tungsten carbide.

  A fixed hole 1h is formed at the front end of the joint 1g to be inserted and fixed to the joint 1d of the grip 1b. In this embodiment, the bonded portion 1d is shrink-fitted into the fixed hole 1h, or the gripped portion 1b and the base portion 1c are brazed with the bonded portion 1d inserted into the fixed hole 1h. The grip portion 1b and the base portion 1c are joined. That is, in this embodiment, the grip portion 1b and the base portion 1c are joined by shrink fitting or brazing. Note that a male screw may be formed on the outer peripheral surface of the bonded portion 1d and a female screw may be formed on the inner peripheral surface of the fixing hole 1h. That is, the grip portion 1b and the base portion 1c may be joined by screws.

  In this embodiment, as shown in FIG. 2 (D), the distal end portion of the gripping portion 1b that has returned to its original shape is bent before the operation, and the bent portion 1a is formed in a shape necessary for the operation. One type or several types of forceps 1 required at the time of surgery are prepared. For example, a forceps 1 having a bent portion 1a bent as shown in FIG. 2A, a forceps 1 having a bent portion 1a bent as shown in FIG. 2B, and a forceps 1 shown in FIG. 2C. Three types of forceps 1 are prepared: forceps 1 having a bent portion 1a that bends.

  Further, after the operation, the forceps 1 are cleaned and sterilized by an autoclave. In the autoclave, the forceps 1 are cleaned and sterilized in a high temperature environment of about 130 ° C. The tip portion returns to its original shape. If the surgeon wants to use a forceps 1 having a bent portion 1a having a different shape or curvature from the prepared bent portion 1a of the forceps 1 depending on the situation at the time of surgery, The bent portion 1a is heated to return the distal end portion of the gripping portion 1b to its original shape, and then the distal end portion of the gripping portion 1b is bent again to form the optimally bent portion 1a. In this embodiment, the bent portion 1a is formed by bending the tip portion of the grip portion 1b using a tool such as pliers.

(Main effects of this form)
As described above, in this embodiment, the grip portion 1b where the bent portion 1a is formed is formed of a shape memory alloy, and the distal end portion of the grip portion 1b is bent before the operation, and is necessary for the operation. By forming the bent portion 1a in the shape to be obtained, the forceps 1 required at the time of surgery is prepared. Further, in this embodiment, the bent distal end of the gripping portion 1b returns to its original shape due to heat at the time of washing and sterilization performed after the operation, so that the distal end of the gripping portion 1b is returned before the next operation. By bending the portion and forming the bent portion 1a in a shape necessary for the operation, the forceps 1 required for the operation can be prepared. Further, the forceps 1 can be reused without breaking the tip of the grip portion 1b. Therefore, in this embodiment, the forceps 1 required at the time of surgery can be used while reusing the forceps 1 without purchasing and storing very many kinds of forceps 1 having different shapes and curvatures of the bent portion 1a. As a result, the initial purchase cost of the forceps 1 and the management cost after purchase can be reduced.

  In this embodiment, the forceps 1 necessary for the operation is prepared by bending the distal end of the gripping portion 1b and forming the bent portion 1a in a shape necessary for each operation. Thus, it becomes possible to prepare the forceps 1 having an optimal shape which is not in the range of 1. Therefore, if the forceps 1 of this embodiment is used, it is possible to perform an optimal operation. Further, in this embodiment, when the surgeon wants to use a forceps 1 having a bent portion 1a having a shape or curvature different from that of the prepared bent portion 1a of the forceps 1 depending on the situation at the time of surgery, the operation is performed during the operation. In the field, since the distal end of the gripping part 1b that has been bent is returned to its original shape, the distal end of the gripping part 1b is bent again to form the optimally bent part 1a. It is possible to obtain the forceps 1 having an optimal shape at the site. As a result, if the forceps 1 of this embodiment is used, a more optimal operation can be performed. In addition, since the optimally shaped forceps 1 can be obtained at the surgical site, it is possible to suppress a reduction in the efficiency of the operation.

  Furthermore, in this embodiment, the forceps 1 having the optimum shape is prepared by bending the distal end portion of the gripping portion 1b to form the bent portion 1a. Therefore, relatively few types of forceps 1 are prepared at the time of surgery. Just do it. Therefore, preparation for surgery becomes easy. In addition, since there are relatively few types of forceps 1 prepared at the time of surgery, communication between the surgeon and the nurse taking out the instrument during surgery is facilitated, and a reduction in the efficiency of the surgery is suppressed. It becomes possible. In addition, since the forceps 1 having the optimum shape is prepared by bending the distal end portion of the gripping portion 1b to form the bent portion 1a, it is possible to perform an operation from among many types of forceps as in the past. There is no need to select the necessary forceps at the prior conference. Therefore, in this embodiment, the selection work of the forceps 1 at the prior conference before surgery is facilitated.

  In this embodiment, when the temperature of the grip portion 1b becomes equal to or higher than the shape recovery temperature, the bent tip portion of the grip portion 1b returns to the original shape that forms a straight line. Therefore, in this embodiment, the bent portion 1a may be formed by bending the tip portion of the grip portion 1b formed in a straight line before surgery or the like. Therefore, with this form, it becomes easy to form the bending part 1a in the shape required by surgery.

  In this embodiment, the grip portion 1b is formed of a shape memory alloy, but the base portion 1c is formed of a metal material other than the shape memory alloy such as stainless steel. Therefore, in this embodiment, the cost of the forceps 1 can be reduced as compared with the case where the entire forceps 1 is formed of a shape memory alloy.

  In this embodiment, the grip portion 1b and the base portion 1c are joined by shrink fitting or brazing. Therefore, in this embodiment, it is possible to increase the bonding strength between the gripping portion 1b and the base portion 1c, and it is possible to increase the heat resistance of the bonding portion between the gripping portion 1b and the base portion 1c. Further, in this embodiment, since the adhesive for joining the grip portion 1b and the base portion 1c is not used, the forceps 1 with less biotoxicity can be configured. Even when the grip 1b and the base 1c are joined by screws, the same effect can be obtained.

  In this embodiment, the shape recovery temperature of the shape memory alloy constituting the grip portion 1b is equal to or higher than the human body temperature. Therefore, in this embodiment, even if the grasping portion 1b is formed of a shape memory alloy, it is possible to prevent the distal end portion of the grasping portion 1b that is the bent portion 1a from returning to the original shape during the operation. Become. In this embodiment, since the shape recovery temperature of the shape memory alloy constituting the grasping portion 1b is 50 ° C. or more and 60 ° C. or less, the distal end portion of the grasping portion 1b is treated with, for example, heated physiological saline during surgery. By soaking, it becomes possible to reliably return the bent distal end of the gripping portion 1b to its original shape at the surgical site. Therefore, in this embodiment, when the surgeon wants to use the forceps 1 having the bent portion 1a having a shape or curvature different from that of the prepared bent portion 1a of the forceps 1 according to the actual operation situation, the operation is performed. It is possible to relatively easily return the distal end of the bent gripping portion 1b to its original shape and then bend it again relatively easily at the surgical site to form the optimally bent portion 1a. .

  In this embodiment, the transformation start temperature of the shape memory alloy constituting the grip portion 1b is 0 ° C. or higher. Therefore, in this embodiment, it is possible to relatively easily bring the tip of the gripping portion 1b that has returned to its original shape to the transformation start temperature or lower at the surgical site during surgery. Therefore, in this embodiment, it is possible to form the appropriate bent portion 1a by bending the distal end portion of the gripping portion 1b, which is equal to or lower than the transformation start temperature, again.

(Other embodiments)
The surgical instrument of the above-described form is the forceps 1 used when grasping the tissue in the patient's body, but the surgical instrument to which the present invention is applied is shown in FIG. It may be a scissor 11 that is used when the tissue is taken out from the body by being hooked on the tissue. In the example shown in FIG. 5, both end portions of the flange 11 are bent portions 11a that are bent. That is, the bent portion 11a constitutes both end portions of the flange 11. The flange 11 includes a flange-shaped portion 11b as a bent portion forming portion where the bent portion 11a is formed, and a base portion 11c to which the flange-shaped portion 11b is joined. The hook-shaped part 11 b constitutes both ends of the hook 11.

  The hook-shaped portion 11b is formed of a shape memory alloy similar to the shape memory alloy constituting the grip portion 1b. In the example shown in FIG. 5, one of the two hook-shaped portions 11 b is formed in a single plate shape, and the other hook-shaped portion 11 b is formed in a bifurcated shape. The tip of the hook-shaped portion 11b is a bent portion 11a. The bent portion 11a is formed in a shape required for the operation in which the scissors 11 are used. For example, the bent portion 11a is formed in a curved surface shape (curved plate shape). Moreover, the original shape of the front-end | tip part (namely, front-end | tip part of the collar 11) of the hook-shaped part 11b is planar shape (flat plate shape), as shown in FIG. Therefore, when the temperature of the hook-shaped portion 11b is equal to or higher than the shape recovery temperature, the tip of the hook-shaped portion 11b that is bent as shown in FIG. 5 (that is, the bent portion 11a) is planar as shown in FIG. Return to the original shape. The base portion 11c is formed of a metal material other than a shape memory alloy such as stainless steel, like the base portion 1c. The hook-shaped portion 11b is joined to the base portion 11c in the same manner as the grip portion 1b is joined to the base portion 1c. The bent portion 11a may be formed in a shape other than a curved surface.

  Similar to the above-described embodiment, as shown in FIG. 6, the distal end portion of the hook-shaped portion 11 b that has returned to the original shape is bent before the operation, and the bent portion 11 a is formed in the shape required for the operation. Then, one or several types of scissors 11 required at the time of surgery are prepared. In addition, after the operation, in the cleaning and sterilization processing of the scissors 11 by the autoclave, the distal end portion of the bent scissors 11b returns to the original shape. Also, depending on the situation at the time of surgery, when the surgeon wants to use the scissors 11 having a bent portion 11a having a shape or curvature different from the prepared bent portion 11a of the scissors 11, The bent portion 11a is heated to return the bent portion 11b to the original shape, and then the bent portion 11b is bent again to form the bent portion 11a having the optimum shape. 5 and 6 can provide the same effect as that of the above-described embodiment. In this case as well, the bent portion 11a is formed by bending the tip of the hook-shaped portion 11b using a tool such as pliers.

  The surgical instrument to which the present invention is applied may be an instrument other than the forceps 1 and the scissors 11 as long as the bent part corresponding to the bent parts 1a and 11a is formed at the end. For example, the surgical instrument to which the present invention is applied may be an insulator. The surgical instrument to which the present invention is applied may be, for example, a spatula for pushing the tissues in the patient's body, or a scissors (for cutting or peeling the tissue in the patient's body). Scissors).

  In the embodiment described above, the forceps 1 are configured by joining the grip portion 1b and the base portion 1c formed separately, but the forceps 1 is configured by the grip portion 1b and the base portion 1c formed integrally. May be. In this case, the entire forceps 1 is formed of a shape memory alloy. Similarly, in the example shown in FIG. 5, the flange 11 is configured by joining the flange 11 b and the base 11 c formed separately, but the flange 11 b and the base formed integrally are formed. The ridge 11 may be configured by 11c. In this case, the entire ridge 11 is formed of a shape memory alloy. As described above, when the entire surgical instrument is formed of a shape memory alloy, the entire surgical instrument can be freely deformed, so that the usability of the surgical instrument can be improved. . Moreover, it becomes possible to form an epoch-making surgical instrument.

  In the embodiment described above, the shape recovery temperature of the shape memory alloy constituting the grip portion 1b and the bowl-shaped portion 11b is 50 ° C. or more and 60 ° C. or less. The shape recovery temperature of this shape memory alloy is the human body temperature. If it is above, it may be less than 50 ° C or may exceed 60 ° C. Moreover, in the form mentioned above, although the transformation start temperature of the shape memory alloy which comprises the holding part 1b and the bowl-shaped part 11b is 0 degreeC or more, the transformation start temperature of this shape memory alloy is less than 0 degreeC. There may be. In addition, it is preferable that the transformation start temperature of the shape memory alloy of the form mentioned above is more than a human body temperature. If comprised in this way, even if the holding part 1b and the hook-shaped part 11b are formed with the shape memory alloy, the hook-shaped part 11b used as the front-end | tip part of the holding part 1b used as the bending part 1a, or the bending part 11a. It is possible to prevent the tip of the body from being deformed during the operation.

  In the embodiment described above, the distal end of the gripping portion 1b is formed by bending the distal end of the gripping portion 1b and the distal end of the hook-shaped portion 11b using a tool such as pliers. Bend the tip of the grip 1b and the tip of the hook 11b using a bending jig (not shown) to bend the tip of the hook 11b to form the bent portions 1a, 11a. The bent portions 1a and 11a may be formed. The bending jig is, for example, a metal block having a bending hole formed according to the shape of the bent portions 1a and 11a. In this case, the bending portions 1a and 11a are formed by using the bending jig to relatively easily bend the distal end portion of the gripping portion 1b and the distal end portion of the hook-shaped portion 11b that have returned to the original shape. Is possible. In this case, a surgical instrument system is configured by the forceps 1 and the bending jig or by the scissors 11 and the bending jig.

  In the embodiment described above, the gripping portion 1b and the base portion 1c are joined by shrink fitting or brazing, but the joined portion 1d of the gripping portion 1b is press-fitted into the fixing hole 1h of the base portion 1c and an adhesive is used. The grip 1b and the base 1c may be joined.

  In the embodiment described above, the original shape of the distal end portion of the gripping portion 1b is linear, but the original shape of the distal end portion of the gripping portion 1b may be a bent shape such as a curved shape. In the example shown in FIG. 5, the original shape of the tip of the hook-shaped portion 11b is a flat shape, but the original shape of the tip of the hook-shaped portion 11b is a bent shape such as a curved surface. It may be.

1 Forceps (surgical instrument)
1a bent part 1b gripping part (bent part forming part)
1c Base 11 鉤 (surgical instrument)
11a bent part 11b hook-shaped part (bent part forming part)
11c base

Claims (9)

Provided with a bent part at the end that is inserted into the body during surgery and bent,
At least the bending portion is formed of a shape memory alloy.   2. The surgical operation according to claim 1, wherein an end of the surgical instrument that forms the bent portion returns to an original shape that is linear or planar when the shape recovery temperature of the shape memory alloy is reached. Instruments. A bent portion forming portion where the bent portion is formed; and a base portion to which the bent portion forming portion is joined;
The surgical instrument according to claim 1 or 2, wherein the bent portion forming portion is formed of the shape memory alloy, and the base portion is formed of a metal material other than the shape memory alloy.   The surgical instrument according to claim 3, wherein the bent portion forming portion and the base portion are joined by shrink fitting, brazing, or screws.   The surgical instrument according to any one of claims 1 to 4, wherein a shape recovery temperature of the shape memory alloy is equal to or higher than a human body temperature.   The surgical instrument according to claim 5, wherein a shape recovery temperature of the shape memory alloy is 50 ° C. or more and 60 ° C. or less.   The surgical instrument according to any one of claims 1 to 6, wherein the transformation start temperature of the shape memory alloy is 0 ° C or higher.   The surgical instrument according to claim 7, wherein the transformation start temperature of the shape memory alloy is equal to or higher than a human body temperature.   A surgical instrument comprising: the surgical instrument according to any one of claims 1 to 8; and a bending jig for bending the end of the surgical instrument to form the bent part. system.

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