JP2011147533A - Medical stapler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To bend a staple approximately at right angles, and to smoothly and securely return a forming plate. <P>SOLUTION: In the medical stapler, a center opening 13 for housing a compression spring 15 for return is formed in the forming plate 8, and a shaping groove 21 is formed in the lower part of the forming plate 8. The upper part of a spring receiving top 14 for receiving the upper end of the compression spring 15 is pressed by an operation lever 2 rotatably attached to a stapler body 1 to extrude the forming plate 8 downward, and both sides of a staple placed on an anvil 11 are bent within the shaping groove 21 in the forming plate 8 to shape the staple. The upper edge of the center opening 13 formed at the center of the forming plate 8 is divided into right and left sections 17a and 17b, and a weak part 24 is formed in the lower edge 22 between the center opening 13 and the shaping groove 21 to connect leg pieces 20 on both sides. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a medical stapler for stably bending a leg portion of a staple substantially at a right angle.

  In general, medical staples are used in addition to sutures as means for suturing wounds in surgery and the like. This medical staple is composed of a crown portion and a needle tip portion bent at a substantially right angle from both side ends thereof via a bent portion. The medical stapler is a stapler body that includes a head part that houses a plurality of medical staples and a forming plate that pushes both sides of the crown part of the leading staple and bends it inward. By firmly grasping and turning the operating lever, both sides of the crown portion of the leading staple are pushed in at the lower end of the forming plate so as to protrude from the projecting portion of the head portion, and both the needle tips are bent while folding the leading staple inward. The part is inserted into the skin, and the wound is brought close and sutured.

  As shown in Patent Document 1, the staple is bent by a forming groove formed on the tip (lower end) side of the forming plate and an anvil provided at the center of the launching portion. The forming groove is mainly composed of a groove bottom part and groove wall parts on both sides thereof, and the groove wall part is formed at right angles to the groove bottom part. The anvil is provided horizontally, that is, perpendicular to the driving direction. The leading staple is fed onto the anvil. At this time, both sides of the crown portion of the staple protrude from the anvil. By pushing out the forming plate with the operation lever in the launch direction, the protruding portion of the staple is pushed in on both side portions of the forming groove, so that both side portions (leg pieces) of the crown portion are bent substantially at right angles to the inside of the forming groove. Suture the wound. After the wound is sutured, the staple is removed from the anvil while the forming plate is returned to the initial position.

Japanese Patent No. 3054202

  By the way, in the conventional forming plate shape, in order to bend both sides of the staple firmly, it is necessary to bend the staple by increasing the rigidity of the forming plate and narrowing the clearance with the anvil.

  However, if the clearance between the forming plate and both ends of the anvil is small, a large load is applied to the staple and the forming plate when the forming plate is operated to bend both side portions of the staple on the anvil. Moreover, when the forming plate is returned, there is a springback of the folded staple, so that a large sliding resistance is generated between the staple and the forming plate, and a smooth return cannot be performed.

  It is an object of the present invention to provide a medical stapler that can solve the above-described problems and return the forming plate smoothly and reliably.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that an anvil for placing the central portion of the medical staple is formed on the medical staple launching portion provided in the stapler body, The forming plate is arranged so that it can be moved up and down, and a central opening that houses the return compression spring is formed in the center of the forming plate, and a molding groove is formed between the leg pieces projecting on both sides of the lower part. The upper part of the spring receiving piece that receives the upper end of the compression spring is pressed by an operation lever that is rotatably provided on the stapler body, and the forming plate is pushed downward together with the spring receiving piece, and placed on the anvil. In the medical stapler for forming the staple by folding both sides of the staple in the molding groove, the staple is formed at the center of the forming plate. In addition, the upper edge of the central opening is divided into left and right, and a fragile portion is formed at the lower edge that is provided between the opening and the molding groove and connects the upper portions of the leg pieces. .

  The invention according to claim 2 is characterized in that, in claim 1, the fragile part is formed by a notch provided in the lower edge part.

  According to a third aspect of the present invention, in the first or second aspect, a notch formed by dividing an upper edge portion of the forming plate into left and right portions is formed above the weakened portion of the forming plate, and the spring receiving piece is formed. Is characterized in that an engaging portion capable of interrupting is formed in the notch.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the notch is formed in a wedge shape having a wide upper portion and a narrow lower portion, and the spring receiving piece is formed with an engaging portion that engages with the wedge-shaped cut portion. And

  According to the first aspect of the present invention, the upper edge portion of the central opening portion formed in the central portion of the forming plate is divided into left and right portions, and the leg pieces on both sides are provided between the opening portion and the molding groove. Since the fragile portion is formed at the lower edge portion connecting the upper portions of the two, the forming plate can be bent and deformed so that both leg pieces become narrower or wider with respect to the fragile portion. Therefore, when the forming plate is driven downward, the tip ends of both leg pieces of the forming plate are pushed down on both side portions of the leading staple placed on the anvil to be bent inside the forming groove, and the staple tip portion of the staple is Turn to get closer to the center. Then, the staple comes into contact with the upper surface of the anvil by the pressing piece provided in the forming groove of the forming plate and stops. On the other hand, since a load is continuously applied downward to the forming plate, a force is applied to bend and deform so that both leg pieces approach each other around the fragile portion. For this reason, the staple leg piece can be further pressed inward to bend the staple closer to a right angle.

  Thereafter, when the forming plate returns to the initial position, the leg pieces are rotated and deformed so as to spread outwardly around the fragile portion of the lower edge due to its inherent elasticity, so that the frictional force with the staple is rapidly reduced. Therefore, the forming plate returns smoothly and reliably.

  According to the invention which concerns on Claim 2, since the weak part is formed of the notch part provided in the said lower edge part, a weak part can be formed easily.

  According to the invention of claim 3, a notch formed by dividing the upper edge portion of the forming plate into the left and right is formed above the weakened portion of the forming plate, and the spring receiving piece includes an inner portion of the notch. Since the engaging part that can interrupt is formed, when the upper part of the spring receiving piece is pressed by the operating lever, the upper part of the forming plate is pushed to the left and right by the engaging part being cut into the notch, and Since the fragile portion is provided at the lower edge portion, the upper part of the forming plate is expanded around the fragile portion, and a rotating moment is generated so that the lower portion is reduced. Therefore, the leg pieces are arranged in the width direction of the forming plate. It bends inward and deforms. For this reason, the staple leg piece can be further pressed inward to bend the staple closer to a right angle.

  After that, when the forming plate returns to the initial position, the force that pushes the wedge-shaped notch on the upper edge of the forming plate is lost, so the forming plate tries to return to its original state due to its inherent elasticity. The leg piece pivots outward about the weak part of the part. Moreover, since it is possible to rotate beyond the initial state, the frictional force with the staple is rapidly reduced. Therefore, the forming plate returns smoothly and reliably.

  According to the invention of claim 4, since the notch has a wedge shape with the upper part being wider and the lower part being narrower, and the spring receiving piece is formed with the engaging portion that engages with the wedge-shaped notch, the force applied to the operation lever Even if it is small, the force increases due to the wedge effect, and the forming plate can be reliably deformed.

(A) is the side view at the time of non-use of one embodiment of the medical stapler concerning the present invention, (b) is the side view which abbreviate | omitted a part after the end of bending of a staple, and showed in section Enlarged view of the main parts of the above medical stapler Front view of forming plate Front view showing the positional relationship between the forming plate and the medical staple in the initial position Front view of the initial folding of staples with forming plate Front view at the end of staple folding with forming plate Front view of the return after the forming plate has been folded

  FIG. 1A is a side view of a medical stapler according to an embodiment of the present invention when not in use, and FIG. 1B is a side view showing a section after a part of a staple is finished being folded, FIG. Is an enlarged view of the main part.

  In the above figure, reference numeral 1 denotes a stapler body, and 2 denotes an operation lever. Both the stapler body 1 and the operation lever 2 are made of synthetic resin. The stapler main body 1 is formed in a substantially inverted U-shaped longitudinal section, and a head portion 3 for driving out medical staples is fixed inside the front portion.

  The operation lever 2 is provided with a support shaft 4, and this support shaft 4 is supported by a shaft support hole (not shown) provided in the stapler body 1, so that the support shaft 4 is centered upward (in the closing direction). And attached to the stapler body 1 so as to be rotatable downward (opening direction). Further, the portion of the operation lever 2 on the tip 2 a side is housed and disposed in a space (housing portion) inside the stapler body 1.

  Further, when the operation lever 2 rotates in the closing direction, its tip 2a is configured to press a forming plate 8 (described later) toward a medical staple launching portion 5 provided at the tip of the head portion 3. Yes.

  Next, the head plate 3 of the stapler body 1 is provided with a face plate 6 and a magazine portion 7, and a guide block 9 is disposed on the back side of the face plate 6. Sliding guide grooves of the forming plate 8 are formed on both sides of the guide block 9, and a projecting portion 5 is provided at the lower part. An anvil 11 that supports the center portion of the staple from below is disposed in the launch portion 5. Further, a magazine section 7 is formed along the bottom surface of the head section 3, and several to several tens of medical staples 12 are loaded in the magazine section 7, and the ejecting section is sequentially launched from the top by a feeding means (not shown). 5 anvils 11 are configured to be supplied.

  The forming plate 8 bends both sides of the staple 12 and is provided at the top of the launching portion 5 and is slidable in the vertical direction while being guided by the sliding guide groove of the guide block 9.

  As shown in FIGS. 3 and 4, a central opening 13 is formed at the center of the forming plate 8. Further, a leg piece 20 protruding downward from both sides and a molding groove 21 between the leg pieces 20 are provided at the lower part of the forming plate 8. A pressing piece 23 is formed projecting downward at the center of the upper side of the molding groove 21.

  By the way, the forming plate 8 is divided | segmented into right and left in the upper edge part of the center opening part 13 formed in the center part. A cut 18 is formed between the divided upper edge portions 17a and 17b. The notch 18 is formed in a wedge shape having a wide upper portion and a narrow lower portion. Moreover, the weak part 24 is formed in the lower edge part 22 which is provided between the center opening part 13 and the shaping | molding groove | channel 21, and connects the upper part of the leg piece 20 of both sides. Specifically, the fragile portion 24 is formed by a C-shaped cutout portion 25 provided in the lower edge portion 22. Due to the cutout portion 25, the central portion of the lower edge portion 22 becomes fragile and a fragile portion 24 is formed.

  Next, a spring receiving piece 14 is provided on the inner upper portion of the central opening 13. The spring receiving piece 14 has an engaging portion 16 formed on the upper portion of the spring receiving portion 14 a, and the tip 2 a of the operation lever 2 is disposed so as to contact the upper surface of the engaging portion 16 of the spring receiving piece 14. Further, the engaging portion 16 is formed in a wedge shape, and is arranged so as to cut inside the wedge-shaped notch 18 of the forming plate 8.

  A return compression spring 15 is accommodated in the central portion of the inner side of the central opening 13 of the forming plate 8. The upper end portion of the compression spring is engaged with the lower surface of the spring receiving portion 14a of the spring receiving piece 14, and the lower end portion 15a is supported by the guide block 9 (see FIG. 2). For this reason, the forming plate 8 is always urged by the compression spring 15 so as to be in the upper initial position. Further, the operation lever 2 is also urged in the opening direction by the compression spring 15.

  An interval w (see FIG. 4) that is substantially the same as the width of the staple is formed between both ends of the anvil 11 and the forming groove 21.

  Next, an operation mode of the medical stapler having the above configuration will be described. When the wound is sutured, the tip of the head portion 3 is pressed against the skin 30 on both sides of the wound, and the operation lever 2 is pivoted about the support shaft 4 by grasping the operation lever 2. The tip 2a presses the spring receiving piece 14 at the upper end of the forming plate 8 downward. Thus, the forming plate 8 is driven downward from the state of FIG. 4 as shown in FIG. 5 against the spring force of the compression spring 15. Since the tip ends of both leg pieces 20 of the forming plate 8 push down both side portions of the leading staple 12 placed on the anvil 11, both side portions 12 b of the staple 12 are bent inside the forming groove 21, and the staple of the staple 12 The tip 12c is bent from both ends of the anvil 11 so as to approach the center. Since the central portion 12a of the staple is curved in a mountain shape, the pressing piece 23 presses the central portion 12a of the staple downward as shown in FIG. As a result, when the staple 12 comes into contact with the upper surface of the anvil 11 and becomes straight, the lowering of the lower end of the pressing piece 23 stops.

  By the way, a gap w that is substantially the same as the width of the staple 12 is formed between both ends of the anvil 11 and the forming groove 21. Moreover, since the weak part 24 is formed between the upper part of the shaping | molding groove 21 of the forming plate 8, and the notch part 25, intensity | strength is falling. In addition, the staple 12 contacts the upper surface of the anvil 11 by the pressing piece 23 of the forming plate 8 and stops. On the other hand, as shown by the arrow A in FIG. 6, the load is continuously applied downward to the forming plate 8, so that the force that causes the leg pieces 20 to bend and deform so that the leg pieces 20 approach each other around the fragile portion 24. work. In addition, the engaging portion 16 of the spring receiving piece 14 cuts inside the wedge-shaped cut 18 of the forming plate 8 and proceeds downward. Since the upper edge portions 17a and 17b of the forming plate 8 are expanded to the left and right, and the fragile portion 24 is provided at the lower edge portion, the forming plate 8 is centered on the fragile portion 24 as shown by the arrows in FIG. Therefore, the leg piece 20 is bent and deformed inward in the width direction of the forming plate 8. For this reason, the staple leg piece 20 can be further pressed inward and bent at a right angle.

  Then, as the operation lever 2 is moved to the moving end, the tip 12c of the staple 12 is inserted into the skin, approaches each other, pulls the wound and sutures.

  Thereafter, when the operating force on the operating lever 2 is released, the forming plate 8 receives a force that moves upward by the spring force of the compression spring 15. Since the gap between the both ends of the anvil 11 and the forming groove 21 is substantially the same as the width of the staple 12, it is usually between the bent portion of the staple 12 and the groove wall portion of the forming groove 21. A strong frictional force is generated. However, when the forming plate 8 is raised and the pressing piece 23 is separated from the staple, the engaging portion 16 of the spring receiving piece 14 is also shown in FIG. Since it moves upward away from the wedge-shaped notch 18 of the forming plate 8, the force which pushes the wedge-shaped notch 18 between the upper edges 17a and 17b of the forming plate 8 is lost. For this reason, as shown by the arrow in the figure, the wedge-shaped notch 18 of the forming plate 8 tends to be restored to its original state due to the inherent elasticity, so that the forming plate 8 rotates in the direction of the initial state around the weakened portion 24. To do. In addition, since the forming plate 8 can be deformed so that the leg piece 20 opens outward beyond the initial state by the spring back against the bending of the staple, the frictional force with the staple 12 is rapidly reduced. Therefore, the forming plate 8 returns smoothly and reliably. At this time, the staple 12 hits against a detent (not shown) and stops, and after being released from the forming groove 21, when the stapler is lifted, it moves to the front space of the anvil 11 and comes off from the anvil 11. Remain in.

  As described above, even when the forming plate 8 is actuated when the wound is sutured and the staple 12 is bent and the pressing piece 23 formed at the center of the forming groove 21 presses the central portion of the staple onto the anvil 11 and stops, Since a load continues to be applied to the forming plate 8 downward, the leg piece 20 is bent and deformed inward with the fragile portion 24 as the center by this downward load. For this reason, the leg piece 20 of the staple can be pressed further inward and can be stably bent near a right angle.

  Further, when the forming plate 8 is returned, even if a strong frictional force is generated between the staple 12 and the forming groove 21, the leg piece 20 can be bent outwardly around the fragile portion 24, and the forming plate 8 is pulled up. Accordingly, the forming plate 8 can return smoothly and reliably.

  The notch 18 between the upper edge portions 17a and 17b does not need to be wedge-shaped. The engagement portion 16 of the spring receiving piece 14 may be a wedge shape. Further, when the notch 18 has a wedge shape, the engaging portion 16 of the spring receiving piece 14 does not need to have a wedge shape. In short, the engaging portion may have any shape that can be inserted into the notch when pushed by the operating lever at the time of sewing and can be spread to the left and right when pushed.

DESCRIPTION OF SYMBOLS 1 Stapler main body 2 Operation lever 8 Forming plate 11 Anvil 12 Staple 14 Spring receiving frame 15 Compression spring 16 Engagement part 18 Notch 20 Leg piece 21 Forming groove 22 Lower edge part 23 Pressing piece 24 Fragile part 25 Notch part

Claims (4)

An anvil on which the central portion of the medical staple is placed is formed on the medical staple launching portion provided on the stapler body, and a forming plate is disposed on the upper portion of the anvil so as to be movable up and down. A central opening for storing the return compression spring is formed in the part, a molding groove is formed between the leg pieces projecting on both sides of the lower part, and an operation lever provided rotatably on the stapler body. The upper part of the spring receiving piece that receives the upper end of the compression spring is pressed to push the forming plate downward together with the spring receiving piece, and both sides of the staples placed on the anvil are bent and formed in the forming groove. In medical stapler,
The upper edge of the central opening formed at the center of the forming plate is divided into left and right parts, and the lower edge that is provided between the opening and the molding groove and connects the upper part of the leg pieces is fragile. A medical stapler characterized by forming a part.   The medical stapler according to claim 1, wherein the fragile portion is formed by a notch portion provided in the lower edge portion.   A notch formed by dividing the upper edge of the forming plate into left and right parts is formed above the weakened part of the forming plate, and an engaging part capable of interrupting in the notch is formed in the spring receiving piece. The medical stapler according to claim 1 or 2, wherein   4. The medical stapler according to claim 3, wherein the notch has a wedge shape having an upper portion and a lower portion having a narrow shape, and the spring receiving piece is formed with an engaging portion that engages with the wedge shape notch.

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