DE1284035B - Artificial foot - Google Patents

Description

The invention relates to an artificial foot, which by means of an im Foot movably supported ankle joint bearing and a holder supporting the latter, which ends around the hinge pin in a fork, connected to the lower leg is and for shock absorption of the foot against the holder by elastic buffer means is supported, according to patent 1261277, the additional damping and movement options that affect the front, stronger suspension element.

While there the ball suspension exclusively through the front Suspension elements takes place, here according to the invention, the forefoot, which is in his Heel point can be pivoted up and down via suspension elements, at his Recoil movement downwards over a piston an additional force impulse, the the recoil force of the tensioned front suspension elements increases, while the prosthesis wearer pushes off the ground and at the same time tensions a return spring that acts on the forefoot returns to normal position as the pressure drops.

This solves the problem of achieving the most natural possible Ganges and ball of the foot print from the ground the mobility of the prosthesis wearer to improve and in some way the calf muscle and ankle of the natural Replace leg.

According to A b b. 1 there is a special device that controls the movement when rolling over the foot forwards influenced in the following way when walking: When the ball of the foot is loaded with a body load P, the forefoot pivots in the known manner Way around the rear pivot point resiliently upwards in direction X 1. In contrast to the previous version, this pivoting movement takes place in community with the corresponding suspension element, e.g. B. a rubber hollow spring, over a pressure with receiving piston with cylinder pressure chamber. The rebound effect of the forefoot through the front suspension element in the direction of the arrow down to the starting position X is supported here by the piston.

After Ab b. 2 the following foot movement is achieved: The one when rolling over The foot loaded on the ball of the foot at P is moved upwards in the direction of a piston, as before X 1 moves in a springy and damping manner (piston shown in dotted lines). His recoil after below, in contrast to the previous version, by adding a any force impulse P 2 amplified, the forefoot moved further downwards in direction X 2 and thereby within the walking movement the prosthesis wearer an enlarged, Any repulsive force from the ground in the direction of walking, adjusted to the natural given, so that in some way the natural calf muscle is replaced. Further a return spring is tensioned by the piston and the recoil of the piston absorbed downwards by a buffer elastically while the tensioned return spring Then return the piston and foot to their normal position.

The artificial foot is in A b b. 1, for example, in a sectional drawing shown. The front foot bearing is specially drawn in section A-B on the left. The artificial foot consists of the actual foot part 1 and the calf part 2 or else Called knuckle wood.

Both parts are known and by inserting them in between of suspension elements connected to one another in the known way, in contrast to the known designs if the front, stronger suspension element consists of a hollow rubber spring t or a any similar suspension element and from an additional shock absorber, the for example made of a light metal such as titanium. The suspension element is at the top with a threaded sleeve 3, in the lower calf part 2 in the known way, for example screw connection attached. It is screwed into the threaded socket Guide tube 4 of the compression piston 5. As a stop cushioning and seal on the piston serves an intermediate layer 6. The piston is with its lower shaft end in the joint bracket 8 screwed and secured by a lock nut 8 a. The transverse part of the hinge bracket serves to support the Feder7, which by the threaded shaft of the piston more or can be less preloaded. The front suspension element is down with his Joint bracket by means of a threaded bolt 11 and a lock nut 12 on the inner ring attached to the torsion rubber bushing 10 and thus rotatable, elastic to the side and stored maintenance-free. The torsion rubber bushing is in the bearing with its outer ring 9 firmly pressed in, and over the threaded pin of the bearing 9 is thus a solid Connection established with the foot part 1 in the known manner.

The heel suspension under the load P 1 is opposite the known designs carried out as follows: When the heel is loaded with P 1 the foot in the center Y of the threaded bolt 11 is moved upwards in the direction Y 1 and twisted the tightly pressed-in torsion rubber bushing. Through this Twisting is thus achieved part of the heel suspension. The rest of the suspension is caused by one or more hollow rubber springs on the back of the heel 17 or any other suspension elements, the top and bottom by support rings 16 are supported. The spring return of the heel from top to bottom, from Y 1 to Y is made elastic by two stop buffers 14, one each in the foot and one in the calf part limited. The rubber hollow spring 17 is guided by a heel bar 13, which is embedded in elastic coats 15 and 18 and in the foot 1 and calf part 2 is elastically supported and guided on all sides. The ones in between above and below Stop buffers 14 result in connection with the heel bar 13 in addition to an elastic Limiting the heel suspension an elastic lock for the ball suspension. the Equinus footsteflung and the spring preload can be controlled via an adjusting screw 19 associated lock nut 20 can be changed.

From b. Figure 2 is a schematic cross-sectional view of the recoil piston 5 a, which is guided in a housing 4 a. The dotted lines show the piston position in the event of a load on the ball of the foot and in cooperation with it, the relaxed return spring 21. After the piston has reached its highest point due to the ball load P, a force impulse of your choice of strength2 is used to reinforce the recoil switched on, the pistonSa, the foot bearing point Y and finally the ball of the foot Press X 1 from above in the direction of the arrow downwards X 2, at the same time pressing the previous one relaxed return spring biases until the pressure P 2 stops and the stop below is elastically limited by a buffer 22. The tensioned return spring 21 brings the forefoot and the piston then finally in their normal or starting position before loading the ball of the foot back in direction X (dotted arrow).

Claims (4)

Claims: 1. Artificial foot to achieve a possible natural gait and ball of the foot print from the ground by means of suspension damping and recoil elements is resiliently and pivotably attached to the calf part, according to the patent 1261277, characterized in that the in a heel point up and down The forefoot can be pivoted via suspension elements during its downward recoil movement receives an additional force impulse via a piston, which the recoil force of the tensioned front suspension elements increased, thereby removing the prosthesis wearer from the ground pushes off and at the same time tensions a return spring that pushes the forefoot when the pressure decreases Returns pressure to normal. 2. artificial foot according to claim 1, characterized in that the front Suspension element consisting of an internally guided piston with a compression chamber damped hollow rubber spring. 3. Artificial foot according to claim 1, characterized in that the front The ankle joint consists of a torsion rubber-metal suspension that provides the heel suspension the rear suspension elements supported. 4. artificial foot according to claim 1, characterized in that the heel suspension consists of an internally guided rubber hollow spring.