JP4576589B2 - Surgical needle - Google Patents

Description

  The present invention relates to a surgical suture needle used during a surgical operation.

  The surgical suture needle includes a needle body portion that is curved and extends in an arc shape, a needle base portion that connects sutures, and a sharp needle tip. Conventionally, as this type of surgical suture needle, there is provided a cutting blade forming portion having a triangular shape in a cross-sectional view continuous toward the needle tip between the needle barrel portion and the needle tip. The thing in which the cutting blade which goes to a needle point along each was formed is known (for example, refer to patent documents 1).

  By the way, it is preferable that the surgical suture needle be formed sharply with a relatively small blade angle of each cutting blade in order to reduce resistance (piercing resistance) when piercing a tissue such as a human body. Specifically, the cutting blade provided at the cutting blade forming portion of the surgical suture needle is also formed to have a very sharp blade angle (20 to 30 degrees) as seen in a razor blade angle or a cutter knife blade angle. It is desirable to do.

  However, if the edge angle of each cutting edge is formed extremely sharply at the cutting edge forming part, for example, it becomes difficult to form the cutting edge by press molding, and a sufficient thickness is obtained at the cutting edge forming part. This is disadvantageous in that the bending strength of the suture needle is reduced.

Furthermore, this type of surgical suture needle is known to be grasped by a needle holder during tissue suturing. However, if the needle holder is inadvertently abutted against the cutting blade, the cutting blade may be damaged. There is a possibility that piercing resistance becomes large and smooth stitching cannot be performed.
JP-A-9-322898

  In order to eliminate such inconvenience, the present invention not only prevents the cutting blade from being damaged when grasped by the needle holder, but also enables the cutting blade to be sharply formed while obtaining high bending strength. An object of the present invention is to provide a highly operative surgical needle.

In order to achieve such an object, the present invention provides a needle body portion that is curved and extends in an arc shape with one side of a triangular shape in cross-sectional view being an inner circumferential surface or an outer circumferential surface, a needle base portion that connects a suture, In a surgical suturing needle comprising a needle tip, a cutting blade forming portion is provided between the needle barrel portion and the needle tip, and the cutting blade forming portion is formed on the peripheral surface continuous from the needle barrel portion. A first blade portion in which only a pair of side blades having a predetermined blade angle is formed along both side edges, and a pair of side blades that are continuous from the first blade portion while maintaining the predetermined blade angle are formed, and the peripheral surface A second blade portion having a angle blade of a predetermined blade angle formed on the top edge on the opposite side thereof, and a double-sided blade and a mountain blade continuous with the second blade portion while maintaining their respective blade angles and approaching each other e Bei and a third blade unit toward earlier, the between the side blade and the Yamaha in the second blade portion, the side edges slope that is inclined from the front end of the side cutting edge toward the base portion of the side edge And a straight line connecting the angled slope of the angled blade from the edge of the angled blade to the base of the angled blade, and the edge of the side edged edge and the angled edge of the angled blade are obtained by translating near the axis of the second edged portion. A first concave portion formed by an intermediate inclined surface formed along a straight line formed between the side blade and the angle blade in the third blade portion, and a base portion of the side blade and a base portion of the angle blade. A second recess having an intersecting shape is formed .

In the surgical suture needle of the present invention, a cutting blade forming portion is provided between the needle body portion and the needle tip, and the cutting blade forming portion is constituted by a first blade portion, a second blade portion, and a third blade portion. Has been. Among these, the 1st blade part is not provided with a cutting blade (mountain blade) in the top edge on the opposite side of the above-mentioned peripheral surface, but a side blade as a cutting blade is formed only on both side edges of the peripheral surface. By doing so, the first blade portion adjacent to the needle barrel portion and possibly in contact with the needle holder or the like has no cutting edge at the top edge on the opposite side of the peripheral surface, and more than the first blade portion. Since sharp angle blades can be formed on the second and third blade portions on the needle tip side, where there is very little risk of a needle holder or the like coming into contact with each other, damage to the angle blades is prevented and high piercing is achieved. Sex can be obtained.
Moreover, the 1st recessed part of a 2nd blade part is the intermediate | middle inclination formed along the line obtained by parallelly moving the line which connects the front-end | tip of a side blade and the front-end | tip of a mountain blade near the axial center of this 2nd blade part. Since it has a surface, even if the blade angle between the side blade and the mountain blade of the second blade portion is relatively small, the thickness of the second blade portion can be increased and high bending strength can be obtained. In addition, the third blade portion can be continuously formed up to the needle tip in a sharp state even if the blade angle between the side blade and the angle blade is relatively small by the second recess, and has high piercing properties. Obtainable. Further, when forming the second blade portion, the length from the tip of the angle blade to the base portion can be made relatively small, and the intermediate inclined surface of the first recess is formed between the tip of the side blade and the angle blade. Since the line connecting the tip may be set so as to be along the line obtained when the second blade portion is moved parallel to the axis of the second blade portion, for example, a sharp angle blade is formed in a press mold. It is possible to make the mold groove of the part relatively shallow, and it is possible to easily design and manufacture a mold having high mold accuracy without mold cracking and biting.

  Further, the boundary between the needle body part and the cutting blade forming part is positioned closer to the needle tip side than the center in the longitudinal direction of the suture needle, and the angle of the angle blade extending from the second blade part to the third blade part The length dimension is preferably ½ of the length dimension of the cutting edge forming portion. As a result of confirming the position of the grip mark by the needle holder with respect to a large number of surgical suture needles after use, the present inventor positions the cutting blade forming portion closer to the needle tip side than the longitudinal center of the suture needle. As a result, it was found that the grip traces at the cutting edge forming portion were extremely small, and that there were no grip traces from the position 1/2 of the length of the cutting blade forming portion to the needle tip. From this, by making the length dimension of the angled blade extending from the second blade part to the third edge part 1/2 of the length dimension of the cutting edge forming part, damage to the angled blade can be reliably avoided, High piercing property can be obtained.

  An embodiment of the present invention will be described with reference to the drawings. 1 is a side view showing a surgical suture needle according to the present embodiment, FIG. 2 is an enlarged view of a main part in FIG. 1, FIG. 3 is a sectional view taken along line III-III in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line VV of FIG. 2, FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 2, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. It is a table | surface which shows the design procedure of the 2nd blade part according to a shape, and its cross-sectional shape.

  As shown in FIG. 1, a surgical suture needle 1 (hereinafter referred to as a suture needle 1) of the present embodiment includes a needle body portion 2 that is curved in an arc shape, a needle base portion 4 to which a suture thread 3 is connected, A sharp needle tip 5 is provided, and a cutting edge forming portion 6 is integrally provided between the needle body portion 2 and the needle tip 5. The cutting edge forming portion 6 is located closer to the needle tip 5 than the longitudinal center s of the suture needle 1. As shown in FIG. 2, one end (the needle base 4 side) of the cutting edge forming portion 6 is continuous with the needle body portion 2 through the boundary portion 7, and the other end is continuously formed with the needle tip 5. ing. The cutting edge forming portion 6 is formed in a shape that gradually becomes narrower toward the needle tip 5.

  As shown in FIG. 3, the needle body portion 2 is formed in a triangular shape in sectional view, and is curved with one side thereof as an inner peripheral surface 8. The needle body 2 is gripped by the inner peripheral surface 8 and the top 9 on the opposite side by a needle holder (not shown). At this time, the inner peripheral surface 8 widely hits the needle holder so that stable gripping can be performed. Further, in the needle body portion 2, both side corner portions 10, 10 of the inner peripheral surface 8 and the top portion 9 on the opposite side of the inner peripheral surface 8 are formed in an arcuate shape, and further, the top portion 9 on the opposite side of the inner peripheral surface 8. The angle is formed at about 70 degrees, so that it is difficult to damage even if the needle holder comes into contact.

  As shown in FIG. 2, the cutting blade forming portion 6 includes a first blade portion 11 extending in the direction of the needle tip 5 continuously from the boundary portion 7 and a first blade portion 11 extending from the first blade portion 11 in the direction of the needle tip 5. A two-blade portion 12 and a third blade portion 13 that reaches the needle tip 5 continuously from the second blade portion 12 are configured.

  The boundary portion 7 is a portion that smoothly connects the needle barrel portion 2 and the first blade portion 11, and the arcs of the side corner portions 10, 10 are formed smaller than the needle barrel portion 2 as shown in FIG. 4. ing. As shown in FIG. 5, the first blade portion 11 includes side blades 14 and 14 having blade angles formed at 28 degrees along both side edges of the inner peripheral surface 8. On the other hand, the top portion 9 on the opposite side of the inner peripheral surface 8 is formed in a circular arc shape, and no cutting edge is formed. Thereby, even if the part of the 1st blade part 11 is hold | gripped with a needle holder, damage to the top part 9 on the opposite side of the internal peripheral surface 8 is prevented similarly to the needle body part 2.

  As shown in FIG. 6, the second blade portion 12 includes side blades 14 and 14 that extend continuously from the first blade portion 11 without changing the blade angle. Further, the second blade portion 12 includes a mountain blade 15 having a blade angle of 26 degrees along the top edge on the opposite side of the inner peripheral surface 8. A first recess 16 is provided between the side blade 14 and the mountain blade 15. The first recess 16 includes a side blade inclined surface 17 that is inclined from the tip of the side blade 14 to the base of the side blade 14, a mountain blade inclined surface 18 that is inclined from the tip of the mountain blade 15 to the base of the mountain blade 15, It is comprised by the intermediate | middle inclined surface 19 between the base part of the side blade 14 and the base part of the mountain blade 15.

  As shown in FIG. 7, the third blade portion 13 includes side blades 14 and 14 and a mountain blade 15 that continuously extend from the second blade portion 12 without changing the respective blade angles. The side blades 14 and 14 and the mountain blade 15 of the third blade portion 13 head toward the needle tip 5 while approaching each other while maintaining their respective blade angles. In addition, a substantially V-shaped second concave portion 20 where the base portion of the side blade 14 and the base portion of the mountain blade 15 intersect is formed between the side blade 14 and the mountain blade 15 of the third blade portion 13.

Further, the length _{L 2} of the Yamaha 15 from the second blade portion 12 over the third blade portion 13, the cutting edge forms part 6 (i.e., the first blade portion 11, the second blade section 12, and the third blade portions 13 are approximately 1/2 of the length _{L 1} of the total). Note that the length dimension L _2, if the length a sufficient penetration resistance can be obtained, may be slightly shorter than half the length L _1. Further, the length dimension L ₂ are preferably not exceed 1/2 of the length dimension L _1, there is no problem if slightly beyond the half of the length dimension L ₁ by a molding error, etc. .

  Thereby, the angle blade 15 can be kept away from the holding position by a needle holder, and the fall of the piercing property accompanying the damage of the angle blade 15 can be prevented.

  Here, the shape of the second blade part 12 will be described in more detail. As shown in FIG. The line r is formed along a line obtained by translating the connecting line r closer to the axial center of the second blade portion 12. By doing so, even if the side blades 14 and the mountain blades 15 are sharply formed, the thickness can be increased by the intermediate inclined surface 19 and the bending strength of the second blade portion 12 can be improved. The intermediate inclined surface 19 has no problem if it is substantially parallel to a line r connecting the tip of the side blade 14 and the tip of the mountain blade 15 when an error or the like occurs during molding.

Further, by setting the intermediate inclined surface 19 from a line obtained by translating a line r connecting the tip of the side blade 14 and the tip of the mountain blade 15 closer to the axial center of the second blade portion 12, FIG. As schematically shown in Fig. 2, the shape of the second blade portions 12, 12a, 12b suitable for the needle materials 21, 21a, 21b having different shapes can be easily obtained. That is, as shown in FIG. 8, first, the shape of the needle material capable of obtaining sufficient bending strength is set (procedure 1 in FIG. 8). As the shape of the needle material at this time, three preferable ones are shown in FIG. Each needle material 21, 21a, 21b has a different ratio between the width dimension X and the height dimension Y of the base (inner peripheral surface 8), and the first needle material 21 (the suture needle 1 of the present embodiment) is different. The ratio of the width dimension X to the height dimension Y is 10: 7, and the second needle material 21a is a ratio of the width dimension X to the height dimension Y of 10: 8.5. In the material 21b, the ratio of the width dimension X to the height dimension Y is 10: 6. Then, these needle material 21, 21a, when using 21b, even any one, first, set the angle theta ₂ of the angle theta ₁ Yamaha 15 side edge 14 (the procedure of FIG. 8 2) Next, a line r connecting the tip of the side blade 14 and the tip of the angle blade 15 is translated closer to the axial center to form the intermediate inclined surface 19 (procedure 3 in FIG. 8). By carrying out like this, with respect to each needle material 21, 21a, 21b, it is provided with the sharp side blade 14 and the mountain blade 15, and the second blade portions 12, 12a, 12b having high piercing property and high bending strength. A shape can be obtained (procedure 4 in FIG. 8). Note that the angle θ ₁ of the side blade 14 and the angle θ _{2 of the} mountain blade 15 are both preferably 20 degrees to 30 degrees, whereby extremely high piercing properties can be obtained.

  Further, when the second blade portions 12, 12a, 12b are formed by press molding, the shape of the mountain blade 15 and the first recess 16 obtained as described above is determined by a press molding die (not shown). Therefore, it is possible to easily design and manufacture a mold having a high molding accuracy in which the mold groove forming the angled blade 15 is relatively shallow and does not crack or bite.

  In the present embodiment, the suturing needle 1 that is curved with one side of the triangular shape in cross section as the inner peripheral surface (inner peripheral surface 8) has been described. It goes without saying that the same effect can be obtained even with a suture needle that is curved with one side as the outer peripheral surface.

The side view which shows the surgical suture needle of one Embodiment of this invention. The enlarged view of the principal part in FIG. III-III sectional view taken on the line of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. VV sectional view taken on the line of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 2. The VII-VII sectional view taken on the line of FIG. The table | surface which shows the design procedure of the 2nd blade part according to the cross-sectional shape of a needle material, and its cross-sectional shape.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Surgical needle for operation, 2 ... Needle trunk part, 3 ... Suture thread, 4 ... Needle base part, 5 ... Needle tip, 6 ... Cutting blade formation part, 8 ... Inner peripheral surface (peripheral surface), 11 ... First blade , 12 ... second blade part, 13 ... third blade part, 14 ... side blade, 15 ... mountain blade, 16 ... first recess, 17 ... side blade inclined surface, 18 ... mountain blade inclined surface, 19 ... intermediate inclination Surface, 20 ... second recess.

Claims (2)

In a surgical suture needle comprising a needle body extending in a circular arc shape with one side of a triangular shape in cross-sectional view as an inner or outer peripheral surface, a needle base connecting a suture, and a sharp needle tip,
A cutting edge forming part is provided between the needle body part and the needle tip,
The cutting blade forming portion includes a first blade portion in which only a pair of side blades having a predetermined blade angle is formed along both side edges of the peripheral surface continuous from the needle body portion, and a predetermined blade from the first blade portion. A second blade part in which a pair of side blades are formed while maintaining a corner and a mountain blade having a predetermined blade angle is formed on the top edge opposite to the peripheral surface, and a double-sided blade that is continuous with the second blade part Bei example and a third blade unit and Yamaha toward the needle tip approaching each other while maintaining the blade angle of each and,
Between the side blade and the angle blade in the second blade portion, there is a side blade inclined surface that is inclined from the tip of the side blade to the base of the side blade, and a mountain that is inclined from the tip of the angle blade to the base of the angle blade. A second inclined surface formed by a blade inclined surface and an intermediate inclined surface formed along a straight line obtained by translating a straight line connecting the tip of the side blade and the tip of the angle blade closer to the axis of the second blade portion. 1 recess is provided,
A surgical suturing needle, wherein a second recess having a shape in which a base portion of the side blade and a base portion of the angle blade intersect is formed between the side blade and the angle blade in the third blade portion . The boundary between the needle body part and the cutting blade forming part is located closer to the needle tip than the center in the longitudinal direction of the suture needle,
The surgical suture according to claim 1, wherein a length dimension of the angle blade extending from the second blade part to the third blade part is ½ of a length dimension of the cutting blade forming part. needle.

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