JP5546293B2 - Prosthetic limb for competition - Google Patents

Description

  The present invention relates to a prosthetic limb, and particularly to a prosthetic limb for competition using a leaf spring.

  As shown in FIG. 12, the conventional prosthetic limb 10 for a competition includes a socket 20 into which a stump is inserted and fixed, a crus 30a and a foot 30b extending downward from the socket 20 directly or via a knee joint. (For example, refer to Patent Document 1). The leaf spring 30 has an arcuate shape when viewed from the side, and is curved so that the front is concave.

JP 11-291189 A

  The prosthetic limb for competition has progressed remarkably, and disabled persons wearing prosthetic limbs can run at a speed comparable to that of healthy persons. This is because the leaf spring 30 of a recent prosthetic limb for competition is made of carbon fiber reinforced plastic. The fiber spring reinforced plastic leaf spring 30 has high strength and repulsive force, and can run fast.

  However, even if the leaf spring 30 is made of fiber fiber reinforced plastic, it is necessary to support the human weight (about 70 kg), and the width w of the leaf spring 30 has to be about 60 mm.

  The inventor considered that the air resistance of the leaf spring 30 cannot be ignored as a prosthetic limb for competition where the width w is as much as 60 mm. Further, it was considered that the vortex loss generated near the side edge of the leaf spring 30 cannot be ignored.

  Therefore, an object of the present invention is to provide a prosthetic limb for competition that can run faster with less air resistance and eddy loss.

The prosthetic limb according to the present invention, which has been made to solve the problem, is curved forward to form a socket into which a stump is inserted, a lower leg extending downward from the socket or via a knee joint, and a foot. and and a leaf spring has, with the front and extending Mashimashi air resistance suppressing member suppresses the air resistance toward the foot portion from the lower leg to the upper surface of the foot portion of the lower leg, the air resistance suppression member the cross-sectional shape of the cut surface perpendicular to the longitudinal direction has a substantially arcuate convex, the height of the cross section is characterized that you gradually increases toward the toe.

Since the front及beauty on surfaces of the leaf spring comprises an air resistance suppressing member suppresses the air resistance, it can run faster.

In the above prosthetic limb for competition, a vortex suppressing member for suppressing vortices may be provided in the lower leg part .

Since the vortex suppressing member that suppresses the vortex is provided in the lower leg portion of the leaf spring, it is possible to run faster.

Moreover, the air resistance suppression member extends to the rear surface of the lower leg, the shape of the cut surface perpendicular to the longitudinal direction has a sectional shape of the convex (or Nakata), the height of the cross-sectional shape It is good to gradually increase downward . Moreover, the said vortex suppression member is good to extend in the side surface of the said crus part, and to make the cross section into the shape of a ball or a deformed ellipsoid.

  Air resistance can be reduced effectively.

  The air resistance suppressing member may be made of a soft resin.

  The deformation of the leaf spring is not suppressed, and the injuries of the other side of the prosthetic limb and the lower limb or another person's prosthetic limb and the lower limb are suppressed. Moreover, running noise is reduced.

  The vortex suppressing member may be made of a soft resin.

  Since the air resistance suppressing member for suppressing the air resistance is provided on the front surface and / or the rear surface of the leaf spring, it is possible to run faster.

1 is a perspective view of a game prosthesis according to Embodiment 1. FIG. It is a rear view of the artificial limb for competition of Embodiment 1. FIG. 2 is a cross-sectional view taken along line A1-A1 of FIG. FIG. 2 is a cross-sectional view taken along line A2-A2 of FIG. FIG. 3 is a cross-sectional view taken along line A3-A3 in FIG. FIG. 3 is a cross-sectional view taken along line A4-A4 of FIG. It is a perspective view of the artificial limb for competition of Embodiment 2. FIG. 8 is a cross-sectional view taken along line A5-A5 in FIG. It is a front view of the artificial limb for competition of Embodiment 3. FIG. 10 is a cross-sectional view taken along line A6-A6 of FIG. FIG. 10 is a cross-sectional view taken along line A6-A6 of FIG. 9 showing a deformation mode of the vortex suppressing member. It is a perspective view of the conventional artificial limb for competition.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the prosthetic limb 1 of the present embodiment includes a socket 2 into which a stump is inserted, a lower leg 3 a extending downward from the socket 2, and a leaf spring curved forward that constitutes a foot 3 b. 3.

  Note that the prosthetic limb 1 for competition of the present embodiment is for a disabled person cut below the knee, but in the case of the disabled person cut above the knee, a knee joint is mounted between the socket 2 and the leaf spring 3. The

  The leaf spring 3 is made of, for example, carbon fiber reinforced resin (CFRP).

  A first air resistance suppressing member 4a is bonded to the front surface (front side surface) of the leaf spring 3 from the middle of the lower leg 3a to the foot 3b with, for example, a double-sided adhesive tape.

  Further, as shown in FIGS. 1 and 2, a second air resistance suppressing member 4 b is bonded to the rear surface (rear surface) of the lower leg 3 a of the leaf spring 3.

  The first air resistance suppressing member 4a is made of urethane foam, for example, and as shown in FIGS. 1, 3, and 4, the shape of the cut surface that is long along the longitudinal direction of the leaf spring 3 and orthogonal to the longitudinal direction is medium-high. It has a mountain-shaped cross section. Further, the height h of the mountain gradually increases as h1 <h2 from the lower leg 3a side to the foot 3b.

  Similarly, the second air resistance suppressing member 4b is also made of urethane foam. As shown in FIGS. 1, 5, and 6, the shape of the cut surface that is long along the longitudinal direction of the leaf spring 3 and orthogonal to the longitudinal direction is used. It is a mid-high and mountain-shaped cross section. In addition, the height h of the mountain gradually increases as h3 <h4 from above to below the lower leg 3a.

  In addition, since the direction which made the 1st air resistance suppression member 4a and the 2nd air resistance suppression member 4b with foamed polyethylene can be reduced, it is preferable.

  Further, an anti-slip rubber sheet 5 is attached to the lower surface of the foot 3b.

  When the prosthetic limb 1 for competition of this embodiment is mounted | worn and it drive | works ahead, as shown in FIGS. 3-6, air flows from the front to the arrow direction. As shown in FIGS. 3 and 4, the lower leg 3a and the foot 3b are provided with the first air resistance suppressing member 4a having a mountain-shaped cross-section protruding forward, so that the air flow AF0 has a mountain-shaped cross-section. It flows backward along the slope like air flow AF1. Therefore, air resistance is suppressed.

  Further, as shown in FIGS. 5 and 6, since the second air resistance suppressing member 4b having a mountain-shaped cross section protruding rearward is attached to the crus 3a, the crus 3a has passed through the side of the crus 3a. The air flow AF0 flows backward along the slope of the mountain-shaped cross section like the air flow AF2. Therefore, generation | occurrence | production of the back vortex is suppressed and air resistance is suppressed.

  When running with a conventional prosthetic limb for competition, the ground spring vibrates and generates a high-pitched sound when kicking out after grounding. Even if the prosthetic limb 1 for competition of this embodiment is mounted | worn and it runs, since only the 1st air resistance suppression member 4a and the 2nd air resistance suppression member 4b are mounted | worn, only the sound of a knack will be generated. In addition, the mute time is short due to the low frequency.

  Further, since the first air resistance suppressing member 4a and the second air resistance suppressing member 4b are made of urethane foam, the deformation of the leaf spring 3 is not suppressed. Injury to the other side's prosthetic limb or lower limb or another person's prosthetic limb or lower limb is suppressed.

  In addition, when wearing a conventional prosthetic limb for competition, there may be anxiety that the leaf spring may break. Since the prosthetic limb 1 for competition of this embodiment is equipped with the 1st air resistance suppression member 4a and the 2nd air resistance suppression member 4b to the leaf | plate spring 3, the leaf | plate spring 3 has volume, and a sense of stability and security are provided. Increase.

(Embodiment 2)
As shown in FIGS. 7 and 8, the prosthetic limb 1 </ b> A of the present embodiment is formed by integrating the first air resistance suppressing member 4 a and the second air resistance suppressing member 4 b in the competitive prosthesis 1 of the first embodiment. Except for being attached to the thigh 3a, it is the same as in the first embodiment. The same components are denoted by the same reference numerals, and description thereof is omitted.

  As can be seen from FIG. 8, the air resistance suppression member 4 is a cylindrical shape having a rectangular hole in which the first air resistance suppression member 4 a and the second air resistance suppression member 4 b are integrated, and the lower leg 3 a is inserted in the center. It has a shape. Therefore, the prosthetic limb 1A for competition of the present embodiment can be easily assembled by simply inserting the leaf spring 3 into the rectangular hole of the air resistance suppressing member 4.

  8 may be divided into left and right at the center line indicated by a dotted line L in FIG.

  As shown in FIG. 8, the prosthetic limb 1 </ b> A of the present embodiment has a mountain-shaped cross section in which the air resistance suppressing member 4 protrudes forward and rearward, so that the air flow AF <b> 0 is a layer along the outer wall of the air resistance suppressing member 4. Flows backward as AF3. As a result, air resistance is further suppressed.

(Embodiment 3)
As shown in FIGS. 9 and 10, the prosthetic limb 1 </ b> B of the present embodiment is a side surface of the lower leg 3 a of the leaf spring 3 instead of the second air resistance suppressing member 4 b in the prosthetic limb 1 of the first embodiment. The first embodiment is the same as the first embodiment except that the vortex suppressing member 6 is attached. The same components are denoted by the same reference numerals, and description thereof is omitted.

  The vortex suppressing member 6 is made of urethane foam, has a slanted cross-sectional shape as shown in FIG. 10, and wraps around from the front side to the rear side of the crus 3a. Therefore, the vortex (flow AF5 indicated by the dotted line) generated in the vicinity of the side surface of the crus 3a is suppressed and flows like the air flow AF4 without receiving vortex loss.

  Although the vortex suppressing member 6 of the present embodiment has a slanted cross-sectional shape, as shown in FIG. 11, the foamed urethane tube may be halved to hold the side surface of the lower leg 3 a.

1, 1A, 1B ... Prosthetic limb 2 for competition ... Socket 3 ... Plate spring 3a ... Lower leg 3b ... Foot Part 4... Air resistance suppressing member 4a, 4a1... First air resistance suppressing member 4b, 4b1.

Claims (4)

And sockets stump is inserted, and a leaf spring which is curved forwardly that make up a foot portion extending forwardly from the lower leg and the lower leg portion extending downwardly through the direct or knee joint from the socket A competition prosthesis,
An air resistance suppressing member that extends from the lower leg portion to the foot portion on the front surface of the lower leg portion and the upper surface of the foot portion to suppress air resistance ;
The air resistance suppression member has the cross-sectional shape of the cut surface perpendicular to the longitudinal direction by a substantially arcuate convex, athletic prostheses height of the cross section is characterized that you gradually increases toward the toe. Furthermore, the prosthetic limb for competition of Claim 1 provided with the vortex suppression member which suppresses a vortex in the said leg part. The vortex suppressing member extends to the rear surface of the crus and has a substantially circular arc shape with a cross-sectional shape of a cut surface perpendicular to the longitudinal direction, and the height of the cross-sectional shape gradually increases downward. The prosthetic limb for competition according to claim 2. The prosthetic limb for competition according to claim 2, wherein the vortex suppressing member extends to a side surface of the crus and has a cross-sectional shape or a deformed ellipsoidal cross section.

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