JPS5815140B2 - Post for short leg orthosis - Google Patents

Description

Detailed Description of the Invention The present invention relates to a strut for a short leg orthosis, and in particular, in order to limit and expand plantar dorsiflexion of the foot and its plantar dorsiflexion range of motion, the present invention relates to a strut for a short leg orthosis. This invention relates to a support column that is integrally molded with a control means that allows the bending movement to be limited to a desired angular range.

An example of a disorder that requires a short leg brace is hemiplegia caused by a stroke, which causes the foot to become equinus, which hinders walking. Prescribe a leg orthosis.

After Achilles surgery, a short leg orthosis is used to control dorsiflexion of the foot in order to ensure complete healing.

Furthermore, if each node of dorsiflexion and plantar flexion of the foot is paralyzed, an orthosis is required to control plantar dorsal flexion and hold the foot at 90°.

Furthermore, it is necessary to expand the plantar dorsiflexion range according to the degree of recovery from the above-mentioned lower limb disorder.

Conventionally, the orthosis was made entirely of a flexible synthetic resin board called ortholen to restore function and assist walking for lower limb disorders such as those mentioned above, and the entire brace was fixed at the upper part of the gastrocnemius muscle.
A shoehorn-type short leg orthosis has been proposed in which a support column extends downward along the rear surface of the lower leg, and is provided with a caliber that is placed from the tip to the sole of the foot to hold the foot at the 90° angle. This is due to the fact that the ankle joint axis, which performs plantar dorsiflexion of the foot, and the post that bends at the back of the ankle are displaced, causing difficulties for the foot.Although the foot is fixed, it depends on each affected foot. It is impossible to control the desired plantar dorsiflexion range of motion and allow free movement.

Furthermore, in recent years, a support post has been pivoted to the upper end of a metal stirrup that stands up from both sides of the caliber to the ankle joint, creating a leg break, and a protrusion provided at the upper end of the stirrup engages with an adjustment line rod provided on the support post, so that both can be adjusted. A short leg orthosis has been proposed that controls the flexural range of motion of Although it is bent at a simple fixed point, the living ankle joint is an anatomical talocrural joint axis, and such a brace feels strange when worn and of course interferes with walking.

Furthermore, for example, after transitioning from the stance phase to the swing phase in walking, it is difficult for the foot to return to the 900 angle (perpendicular) angle to the lower leg, and there is a risk of falling when landing in the next stance phase.

The present invention overcomes the above-mentioned drawbacks and has a more favorable effect.The purpose of the present invention is to fix it to the heel side plate parts of a holder that supports a foot having a U-shaped cross section, and In a short leg orthosis whose upper end is fixed to a wrapping member at the gastrocnemius muscle region of the lower leg, the support is made of a long and thin plate-like body made of flexible synthetic resin, and the ankle joint part is incised from both sides in a reclining shape. The thin prismatic portion remaining in the center does not allow forward dorsiflexion of the foot during walking, so during the swing phase the foot holder bears the load of the forefoot and returns to the 90° (right angle) position. The tip-shaped portions which provide strength and point upward on both sides serve as locking bodies that are controlled by the engagement of both cut surfaces when the prismatic portion is bent.

When the prismatic part is fully flexed, for example, dorsiflexion of the foot is allowed, the front locking part is removed from the lower end, and when the dorsiflexion angle is gradually expanded as the function recovers, the locking part is removed. A simple configuration and operation are possible in which the trumpet-shaped cut surface is cut in an arc shape from the upper side.

The purpose is to propose an orthosis, and an actual case of the present invention will be described below with reference to the drawings.

1st, 2nd. Figures a and b show a short leg orthosis assembled using strut 1 with plantar flexion control due to hemiplegia due to stroke.

The foot holder 2 used in the orthosis 2 includes a bottom wall part 4 that supports the entire sole of the foot, and a peripheral wall part 5 that extends and stands up from the bottom plate part 4 to reach the back side of the heel and the back side of the midfoot, A band 6 provided with a velvet fastener is provided between the peripheral walls of the metatarsal surface to wrap around the forefoot.

The upper end of the support column 1 is fixed to both outer surfaces of a hard frame member 7 shaped to cover the gastrocnemius muscle of the lower leg.A velvet fastener for fixing the orthosis to the lower leg is attached between the both side edges of the frame member 7. The provided band 8 is attached.

The support column 1 according to the present invention is entirely formed into an elongated plate shape as shown in FIGS. 2a and 2b.

A synthetic resin material having flexible viscoelasticity and durability is used. In the case of this example, polypropylene, which has the best combination of the above properties, was used.

The lower end of the column is a rectangular mounting portion 1 that is expanded laterally to be firmly fixed to the outer surface of both side walls 5 of the foot holder 2 with screws 10, etc.
1 is provided.

The right upper part of the attachment part 11 receives the medial malleolus of the tibia and fibula of the lower leg, so it is curved in an arc toward the outside of the plane of the lower leg as shown in Figure 2, and the ankle joint is connected to the medial malleolus. The lower end and the center of the external body are the joint shafts, and it is necessary to provide a foot step and a control means for the foot step on the support portion corresponding to this portion.

In the present invention, a notch 13 is formed in the shape of an upward curve from the upper part of both side edges of the support part, a joint part 14 is formed at the central prismatic part, and both sides of the notch are used for locking to control the bending of the foot joint 14. It is made with body 15.

In FIG. 2a, the front locking body is removed from the base, and the rear locking body 15 remains.

゛The joint part 14' is used when the lower leg is placed on the ground and the lower leg is tilted forward.
Then, as shown by the dotted line in Figure 2a, the desired rising height is achieved so that the lower limb is bent in an arc shape, and the forefoot is prevented from plantar flexing when the lower limb swings out and lands under the weight of the body. The entire cut surface of the locking body 15 engages with the cut surfaces of the joint 14 and the lower surface of the support portion 16 to prevent backward bending, and when the lower leg tilts sideways while landing, a torsional load is applied. At this time, this part is formed thicker than the mounting part 11 and the support part 16 so that the engagement between the joint part and the locking body does not disengage, thereby providing strength and a uniform engagement surface.

Figure 3 shows a case in which locking bodies are left on both the front and rear sides due to paralysis of both the plantar flexor muscles and dorsi flexor muscles of the ankle joint.
His function gradually recovered through walking training and other measures, and he died by suicide.
Once the ankle is able to return to 0°, the locking body on one side or both sides is cut out in the shape of a circular arc as shown by the one-dot chain line 18 to gradually expand the range of motion of the ankle joint and further train walking. It makes walking itself smooth.

It is convenient for cutting if this one-dot chain line is drawn in advance after measuring the bending angle of the strut.

When cutting out the locking body 15 along the dashed line 18, the outer edge of the locking body is formed wide in advance so that the curved joint cut surface is always in close contact with the cut surface. If the dashed-dotted line is drawn over the measurement so as to match, the bending of the support can be further controlled.

FIG. 4 shows another embodiment of the present invention in which a plurality of locking bodies are formed by making the cuts 13 in different ways.

A plurality of horizontally parallel cuts 13' are provided from both side edges of the column 1 to the prismatic joint portion 14, and further cuts 13'' are provided downward from the front end of the cuts to form a plurality of locking bodies. This is what I did.

If a small amount of extra cut is made from the upper end edge of each locking body 15, the joint portion 14' will be bent while forming the same arcuate surface over its entire length.

Furthermore, the cuts 13 in the strut were made from both sides of the strut, but in cases where only plantarflexion control is needed from the beginning, such as in cases of peroneal nerve paralysis, only one cut from the rear edge of the strut can be made to engage the joint. What is necessary is to mold the stopper body.

When the support having the structure and function described above is raised from both sides of the foot holder and supports the foot, the foot is housed in the holder with the internal and external rotation symptoms of the foot corrected. Moreover, the foot is always held at a position of 90° with respect to the lower leg except when landing (stance phase).

Furthermore, the prismatic joint is made of a synthetic resin material and is formed by easily cutting a notch into a roughly elongated plate-shaped support with a simple cutter.Even if a load is applied and the foot lands on the ground, during the swing phase, the foot will bottom out and dorsiflex. The state returns to the 90° position.

Furthermore, the locking bodies formed integrally with the struts on both sides of the joint part by cutting into the struts control the bending of the struts by their cut surfaces, and when one locking body is cut out, the bending in that direction is prevented. The angle is freely allowed, and as the cut portions of the locking body are sequentially removed in an arc shape, the flexion angle range is gradually expanded, and the dorsiflexion range of the foot and dorsiflexion range can be improved for training and functional recovery. It can be expanded depending on the degree, and it becomes possible to perform activities of daily living extremely appropriately and rapidly.

Furthermore, since the prismatic joint has a rising length and is bent in an arc shape, it is compatible along the anatomical talocrural joint axis of the ankle joint, so that it does not cause discomfort when walking.

[Brief explanation of the drawing]

Figure 1 is an overall perspective view of a short leg orthosis using the strut of the present invention, Figures 2a and b are front and side views of the strut, respectively, and Figure 3 is a view of a locking body for expanding the bending angle of the strut. FIG. 4 is a partial front view showing the resection line, and FIG. 4 is a partial front view showing another actual case of the present invention. 1... Support column, 2... Leg holder, 4...
...Bottom wall part, 5...Side wall part, 6...
...Band, 11...Installation sound -13,13',
13"... cut, 14.14'...
Prismatic joint part, 15... Locking body, 16...
...Supporting part, 18... Cutting line of locking body.

Claims (1)

[Claims] 1 A support for a short leg orthosis consisting of an elongated plate-like body made of a synthetic resin material having flexibility and viscoelasticity, the support having a part corresponding to the ankle joint formed in an arc shape from the side edge toward the bottom. By making the cut in a straight line, one side of the cut has a substantially rectangular cross section and becomes a prismatic joint that bends when external force is applied;
The cut surface of the other side portion engages with the cut surface of the joint portion to form a locking body that controls the bending, and the locking body has an upper portion cut out thickly and in an arc shape along the cut surface. The joint part has a structure that allows the flexion rate to be changed to a desired degree by the stiffness, and the plantar flexion dorsiflexion range of motion of the foot is controlled when walking, and the foot is supported at 90 degrees (perpendicular) to the lower leg when not walking. A brace for a short leg orthosis.