JP5167030B2 - Osteosynthesis plate processing instrument - Google Patents

Description

  The present invention relates to an osteosynthesis plate processing instrument, and more particularly, to an osteosynthesis plate that is preferably used when an osteosynthesis plate is bent at two locations in opposite directions and processed into a step-shaped osteosynthesis plate.

  In recent years, bone fixation and fixation has been performed using an osteosynthesis plate made of a biodegradable and absorbable polymer. In that case, according to the shape or undulation of the osteosynthesis site, for example, the osteosynthesis plate 4 as shown in FIG. 7 (a) is bent at substantially right angles in two opposite directions as shown in (b). In many cases, it is processed into a step-shaped osteosynthesis plate 40 having a step portion 4a in the middle.

  Up to now, bending of the osteosynthesis plate as described above has been done using a pair of forceps (Kochel), and one side of the bending portion of the osteosynthesis plate softened by heating is sandwiched with one of the forceps. Is clamped with the other forceps, or the other side is pinched with a finger and bent.

Also, recently, as a processing tool for the osteosynthesis plate, a support member that supports the processing site of the osteosynthesis plate or its vicinity and a support position for the osteosynthesis plate coupled with the receiving member when a bending force is applied to the osteosynthesis plate. A plurality of parts that cause the osteosynthesis plate to undergo different deformations (parts having a pair of support parts having different holding intervals and pressing parts having different curvatures of the arcuate surfaces). ) In the longitudinal direction has also been proposed (Patent Document 1).
JP 2007-185535 A

  However, if the osteosynthesis plate is bent into a step-shaped osteosynthesis plate 40 as shown in FIG. 7B using conventional forceps, the stepped portion 4a has a predetermined size unless it is very skilled. Thus, it is difficult to bend accurately at two locations, and the stepped portion 4a becomes difficult to pinch with forceps as the size of the stepped portion 4a becomes smaller. However, if the width is smaller than the width dimension of the conventional clamping part of the forceps, there is a problem that bending is impossible.

  Further, the processing tool of Patent Document 1 can bend and deform the osteosynthesis plate or bend it into a bowl shape with a rounded shape, but the step shape as shown in FIG. There was a problem that it was not possible to bend into a step shape with a small size of the portion 4a.

  The present invention has been made to cope with the above-mentioned problems, and the problem to be solved is an osteosynthesis plate that can be easily and accurately folded into an osteoplate with stepped portions having different stepped dimensions. The object is to provide a processing instrument, preferably a forceps-type osteosynthesis plate processing instrument.

  In order to solve the above-mentioned problems, the osteosynthesis plate processing instrument of the present invention is a machining instrument provided with a pair of clamping parts for clamping the osteosynthesis plate, and the opposing surfaces of the clamping parts are laterally widened toward the tip. Are stepwise reduced and divided into a plurality of holding surfaces having different widths, and stepped portions are formed on both side surfaces of the holding portion corresponding to the stepwise reduction of the widths of the opposing surfaces. It is characterized by.

  In the osteosynthesis plate processing instrument of the present invention, the length of each of the plurality of clamping surfaces having different lateral widths of the clamping portion is equal to or greater than the lateral width of the portion to be bent of the osteosynthesis plate, and It is desirable that both side surfaces of the sandwiching portion are inclined inward at an angle of 70 ° to 80 ° with respect to the opposing surfaces of the sandwiching portion.

  Preferably, the clamping part is provided at the distal ends of the left and right arms, and the left and right arms are pivotally attached to the rear crossing part of the clamping part so as to be configured as a forceps-type instrument. Furthermore, it is desirable to provide a locking means at the rear end portion of the arm for locking so that the clamping portion does not open when the osteosynthesis plate is clamped by the clamping portion.

  In the osteosynthesis plate processing instrument of the present invention, since the opposing surfaces of the pair of clamping portions are divided into a plurality of clamping surfaces having different widths, the osteosynthesis plate is bent into a step shape having a step portion of a predetermined dimension. When processing, an osteosynthesis plate softened by heating is inserted and held between opposing clamping surfaces having a lateral width equal to the predetermined dimension, and one end side and the other end side of the osteosynthesis plate are paired with each other. By simply bending in the opposite directions along the side surface of the sandwiching portion, it is possible to easily and accurately bend the stepped osteosynthesis plate having a stepped portion having a predetermined dimension. Therefore, if the osteosynthesis plate is clamped on a clamping surface having a narrow lateral width and bent, a step-shaped osteosynthesis plate with a small stepped portion can be easily obtained. Further, as in the osteosynthesis plate processing instrument of the present invention, when the opposing surfaces of the clamping part are divided into a plurality of clamping surfaces having different lateral widths, it is necessary to prepare a plurality of types of processing instruments having different lateral widths of the clamping parts. Therefore, the increase in the types of processing tools can be suppressed.

  In the above case, if both side surfaces of the sandwiching portion are inclined inwardly at an angle of 70 ° to 80 ° with respect to the opposing surfaces of the sandwiching portion, one end side and the other end side of the osteosynthesis plate are placed on the sandwiching portion. The angle of the bent portions at both ends of the stepped portion of the osteosynthesis plate can be made substantially right-angled simply by bending along the side surfaces in opposite directions. That is, the angle of the bent portion immediately after bending is 70 ° to 80 °, but the bent portion is slightly restored until it is naturally cooled and solidified, and the angle becomes substantially right angle.

  Further, if the length dimension of each clamping surface having a different width of the clamping part is equal to or larger than the width dimension of the part to be bent of the osteosynthesis plate, the part of the osteosynthesis plate to be bent by the clamping surface is Since it can be clamped over the entire width, the bending process can be performed more easily and accurately.

  Then, the sandwiching part is provided at the distal ends of the left and right arms, and the left and right arms are pivotally attached to the crossing part on the rear side of the sandwiching part to constitute a forceps-type instrument. As with conventional forceps, the operability is good, and a locking means is provided at the rear end of the arm to lock the clamping part so that it does not open when the osteosynthesis plate is clamped by the clamping part. Since the osteosynthesis plate can be fixed by the locking means so that it does not fall off from the holding part during the bending process, there is an advantage that the bending process can be surely performed.

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

  1 is a perspective view of an osteosynthesis plate processing instrument according to an embodiment of the present invention, FIG. 2 is a plan view of a pair of clamping parts of the processing instrument in a closed state, and FIG. 3 is a pair of clamping parts of the processing instrument. FIG. 4 is a perspective view showing a pair of clamping parts and an osteosynthesis plate of the processing instrument, and FIG. 5 is a diagram showing a bending process by clamping the osteosynthesis plate between the pair of clamping parts of the machining instrument. FIG. 6 shows the clamping part of the processing tool, (a) is a plan view, (b) is a front view, (c) is a right side view, (d) is a bottom view, FIG. 7 (a) is a perspective view showing an example of an osteosynthesis plate, and (b) is a perspective view of the osteosynthesis plate folded into a step shape.

  The osteosynthesis plate processing instrument of this embodiment is a simple instrument configured as a forceps type as shown in FIGS. 1 to 3, and a pair of clamping parts 1, 1 for clamping the osteosynthesis plate has left and right arms. The arms 2 are pivotally attached to the rear crossing portions 2a and 2a of the sandwiching portions 1 and 1 by pins 3 so as to be rotatable. The rear ends of the left and right arms 2 and 2 are provided with annular portions 2b and 2b for inserting fingers, and fingers (thumb and middle finger) are inserted into the annular portions 2b and 2b so that the arms 2 and 2 are When the opening / closing operation is performed, the sandwiching portions 1 and 1 at the distal end of the arm are opened and closed around the pin 3 so as to sandwich and release the osteosynthesis plate.

  As shown in FIG. 2, when the pair of sandwiching portions 1 and 1 are closed, a gap that is the same as or slightly smaller than the thickness of the osteosynthesis plate is provided between the opposing surfaces 1a and 1a of the sandwiching portions 1 and 1. It is configured so that it can be evenly held with an appropriate force no matter which part of the opposing surfaces 1a, 1a is used to hold the osteosynthesis plate.

  At the rear ends of the left and right arms 2, 2, a pair having engagement claws on the opposing surfaces as locking means for locking so that the clamping portions 1, 1 are not opened when the osteosynthesis plate is clamped by the clamping portions 1, 1. The locking pieces 2c, 2c are provided so as to protrude inward so as to overlap. The locking pieces 2c and 2c allow the arms 2 and 2 to rotate in the closing direction, but prevent the arms 2 and 2 from rotating in the opening direction, so that the holding portions 1 and 1 do not open. When the left and right arms 2 and 2 are slightly distorted up and down to disengage the lock pieces 2c and 2c, the lock can be easily released. When such locking pieces 2c and 2c are provided, the osteosynthesis plate is prevented from dropping from the clamping portions 1 and 1 while the osteosynthesis plate is clamped by the clamping portions 1 and 1 and bent. Therefore, there is an advantage that it can be reliably bent.

A major feature of this osteosynthesis plate processing instrument is the pair of clamping portions 1 and 1 that clamp the osteosynthesis plate 4. That is, as shown in FIGS. 4 and 6, the opposed surfaces 1 a (hereinafter referred to as opposed surfaces 1 a) of the sandwiching portion 1 are gradually reduced in width toward the tip, and a plurality of different widths are obtained. (In this embodiment, five clamping surfaces 1a ₁ , 1a ₂ , 1a ₃ , 1a ₄ , 1a ₅ ), and the clamping is performed in accordance with the stepwise reduction of the width of the facing surface 1a. Steps 1 b are formed on both side surfaces of the part 1. The width dimension of each clamping surface is not particularly limited, but considering the specific dimension of the step portion 4a of the osteosynthesis plate used by bending, the width dimension of the clamping surface 1a _{1 at} the tip having the narrowest width is determined. It is preferable that the width is set to about 2.5 mm and the lateral width of each subsequent clamping surface is increased by 1 mm.

Length L ₁ ~L ₅ of the sandwiching surfaces 1a ₁ to 1A ₅ is a more lateral width of the bending to be part of the osteosynthesis plate 4, folding the osteosynthesis plate 4 bent in any holding surface The part to be processed can be securely clamped over the entire width. In this embodiment, the clamping surface _1a 1 length _L 1 ~L ₄ of to 1A ₄ the same, but a little larger length _{L 5} of the holding surface 1a ₅ at the rear end, all clamping face Of course, the same length may be used. While the length of these holding surfaces 1a ₁ to 1A ₅ is not particularly limited, considering the specific width dimension of the osteosynthesis plate 4, sets the length of the sandwiching surfaces 7mm about or more that Is desirable.

Further, both side surfaces of the sandwiching portion 1 are 70 ° to 80 ° with respect to the opposing surface 1a (the sandwiching surfaces 1a _{1 to} 1a ₄ ) except for both side surfaces that rise perpendicularly from both sides of the rear end sandwiching surface 1a ₅ . Is inclined inwardly at an angle θ. The reason for inclining the both side surfaces of the sandwiching portion 1 in this way is to make it easier to bend the osteosynthesis plate 4 at a substantially right angle as will be described later, and the optimum inclination angle is 75 °. Needless to say, both side surfaces rising from both sides of the rear end clamping surface 1a ₅ may be inclined inwardly at an angle of 70 ° to 80 ° in the same manner as described above.

  Next, by using this osteosynthesis plate processing tool, a flat osteosynthesis plate 4 as shown in FIG. 7A is formed into a step having a step 4a having a predetermined dimension as shown in FIG. A method for bending the shaped osteosynthesis plate 40 will be described.

First, as shown in FIG. 4, the osteosynthesis plate 4 is inserted between a pair of clamping parts 1 and 1 of the processing tool, and the arms 2 and 2 are rotated in the closing direction, so that a predetermined stepped part 4a is formed. The osteosynthesis plate 4 is clamped by the clamping surface of any one of 1a ₁ to 1a ₅ having a lateral width equal to the dimension. When sandwiched in this way, the lock pieces 2c and 2c are engaged with each other, and the sandwiching portions 1 and 1 are locked so as not to open, and the osteosynthesis plate 4 is fixed so as not to drop off. This osteosynthesis plate 4 is made of biodegradable absorbable polymer such as poly-L-lactic acid containing bioactive bioceramics powder such as unfired hydroxyapatite, and is fixed with a biodegradable absorbable screw. For this purpose, a plurality of holes 4b are formed.

  Next, the osteosynthesis plate 4 is softened by heating it with a means such as immersing it in warm water while holding the osteosynthesis plate 4, and one end side and the other end side of the osteosynthesis plate 4 are shown in phantom lines in FIG. 5. As shown, it is bent in opposite directions along the inclined side surfaces of the sandwiching portions 1, 1. This bending operation may be performed by sequentially sandwiching one end side and the other end side of the osteosynthesis plate 4 with different forceps, or may be performed with a fingertip. When bent in this way, the angle of the bent portion immediately after the bending is 70 ° to 80 °, but the bent portion is slightly restored until the osteosynthesis plate is naturally cooled and solidified. As shown by the solid line, the angle of the bent portion becomes substantially right angle, and is processed into a step-shaped osteosynthesis plate 40 having a stepped portion 4a having a predetermined dimension as shown in FIG.

  As described above, this osteosynthesis plate processing tool can be easily and accurately folded into the step-shaped osteosynthesis plate 40 having the stepped portion 4a having a desired size by selecting the clamping surface and clamping the osteosynthesis plate 4. It can be bent. Especially, the processing tool constructed in the forceps type is easy and has good operability, and it is not necessary to prepare multiple types of processing tools with different widths of the clamping part. The effect is that the increase can be suppressed, and it is extremely practical.

  As described above, the method of using the osteosynthesis plate processing instrument of the present invention has been described by taking the case where the osteosynthesis plate 4 is bent into a step shape as an example. However, the processing instrument of the present invention bends the osteosynthesis plate into an L shape. Of course, it is also used when processing.

It is a perspective view of the osteosynthesis plate processing instrument concerning one embodiment of the present invention. It is a top view in the state where a pair of clamping parts of the processing instrument were closed. It is a top view in the state where a pair of clamping parts of the processing tool were opened. It is a perspective view which shows a pair of clamping part and osteosynthesis plate of the processing tool. It is explanatory drawing of the place which clamped the osteosynthesis plate by a pair of clamping part of the processing tool, and was bent. The clamping part of the processing tool is shown, (a) is a plan view, (b) is a front view, (c) is a right side view, and (d) is a bottom view. (A) is a perspective view which shows an example of an osteosynthesis plate, (b) is a perspective view of the osteosynthesis plate folded down in the step shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamping part 1a Opposite surface (opposing surface) of clamping part
1a _{1 to} 1a ₅ clamping surface 1b step 2 arm 2a crossing 2c lock piece (locking means)
4 Osteolytic plate 4a Stepped portion 40 Folded osteosynthesis plate θ Angles of both side surfaces with respect to opposing surfaces of the clamping portion

Claims (5)

  A processing tool comprising a pair of clamping parts for clamping an osteosynthesis plate, wherein the opposing surfaces of the clamping parts are divided into a plurality of clamping surfaces having different lateral widths, with the lateral width being reduced stepwise as approaching the tip. The osteosynthesis plate processing instrument is characterized in that stepped portions are formed on both side surfaces of the holding portion in correspondence with the stepwise reduction of the width of the opposing surfaces.   2. The osteosynthesis plate processing according to claim 1, wherein a length of each of the plurality of clamping surfaces having different lateral widths of the clamping portion is equal to or greater than a lateral width of a portion of the osteosynthesis plate to be bent. Instruments.   The osteosynthesis plate according to claim 1 or 2, wherein both side surfaces of the clamping part are inclined inwardly at an angle of 70 ° to 80 ° with respect to opposing surfaces of the clamping part. Processing equipment.   The forceps type of claim 1, wherein the holding portion is provided at the tip of the left and right arms, and the left and right arms are pivotally attached to the crossing portion on the rear side of the holding portion. 4. The osteosynthesis plate processing instrument according to any one of 3 above.   5. The osteosynthesis plate according to claim 4, wherein a locking means for locking the osteosynthesis plate so as not to open when the osteosynthesis plate is clamped by the clamping portion is provided at a rear end portion of the arm. Processing equipment.

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