WO1994010942A1 - Foot prosthesis - Google Patents

Foot prosthesis Download PDF

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Publication number
WO1994010942A1
WO1994010942A1 PCT/CH1993/000254 CH9300254W WO9410942A1 WO 1994010942 A1 WO1994010942 A1 WO 1994010942A1 CH 9300254 W CH9300254 W CH 9300254W WO 9410942 A1 WO9410942 A1 WO 9410942A1
Authority
WO
WIPO (PCT)
Prior art keywords
prosthesis
heel
characterized
foot according
spatula
Prior art date
Application number
PCT/CH1993/000254
Other languages
French (fr)
Inventor
Alain Lallemand
Original Assignee
Composites-Busch & Cie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CH347192 priority Critical
Priority to CH3471/92-9 priority
Application filed by Composites-Busch & Cie filed Critical Composites-Busch & Cie
Publication of WO1994010942A1 publication Critical patent/WO1994010942A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/76Means for assembling, fitting or testing prostheses, e.g. for measuring or balancing, e.g. alignment means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108Shapes
    • A61F2002/3011Cross-sections or two-dimensional shapes
    • A61F2002/30112Rounded shapes, e.g. with rounded corners
    • A61F2002/30131Rounded shapes, e.g. with rounded corners horseshoe- or crescent- or C-shaped or U-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30433Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5003Prostheses not implantable in the body having damping means, e.g. shock absorbers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5007Prostheses not implantable in the body having elastic means different from springs, e.g. including an elastomeric insert
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/5044Designing or manufacturing processes
    • A61F2002/5055Reinforcing prostheses by embedding particles or fibres during moulding or dipping, e.g. carbon fibre composites
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5072Prostheses not implantable in the body having spring elements
    • A61F2002/5073Helical springs, e.g. having at least one helical spring
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • A61F2002/6614Feet
    • A61F2002/6657Feet having a plate-like or strip-like spring element, e.g. an energy-storing cantilever spring keel
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • A61F2002/6614Feet
    • A61F2002/6657Feet having a plate-like or strip-like spring element, e.g. an energy-storing cantilever spring keel
    • A61F2002/6671C-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • A61F2002/6614Feet
    • A61F2002/6657Feet having a plate-like or strip-like spring element, e.g. an energy-storing cantilever spring keel
    • A61F2002/6685S-shaped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/68Operating or control means
    • A61F2002/74Operating or control means fluid, i.e. hydraulic or pneumatic
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0041Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • A61F2230/0013Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped

Abstract

A foot prosthesis comprising a front plate (1) and a heel (2). The heel (2) is C-shaped with the opening (5) of the C facing the back of the prosthesis. The front plate has a stretched S shape and comprises a forward portion (10), a rear portion (11) and a middle portion (13) where the curvature changes direction. The front plate and the heel each comprise a plurality of layers of carbon, glass or aramide fibres. The fibre layers of the front plate and those of the heel are respectively coated with one or more layers of woven material then impregnated and shaped.

Description

Foot prosthesis

Technical area

5 The present invention relates to a prosthetic foot in composite material.

prior art

10 It has already been proposed a variety of prosthetic feet compor¬ as a frame of composite material based on carbon or glass fibers, such as Kevlar, impregnated with resin.

The prostheses 15 in composite material allows to obtain a flexibility without significant dissipation of energy, so that the prosthesis restores the energy which has led to its bending when the bias ceases.

2O In fact, unlike dentures plastic thermo¬, the flexibility of composite prostheses decreases and when the application of force, which is important especially when climbing stairs. While a thermoplastic prosthesis would continue to

25 fold, the composite prosthesis is stretched and stops, then the load is reduced and when the foot leaves walking, prosthesis restores the energy which has been supplied thereto, thereby facilitating recovery of the body to the next step.

30 Prostheses of this type are for example described in US Patent Nos 4,645,509 and 4,959,073, in French patent applications published under our 2,612,768 and 2,626,463 and in European patent applications published under our 0,401,864 and 0,487,852.

35

However, none of the prosthetic feet above mentioned constitutes a truly versatile prosthesis is suitable for both normal walking and stair climbing. The difficulty of making a slow polyva¬ prosthesis is the variety of reactions it should cause according to the type of stress which it is subject. It must react in some cases as a more or less flexible damper and other like a springboard. In particular, heels prostheses proposed so far, when they are simple in design, are either too soft or too hard. Powerful heels, however, are of a relatively complex design. No foot prostheses that have been proposed so far does not allow to take full advantage of the desirable properties described above in modern composite materials.

Disclosure of the invention

The purpose of the present invention to provide a composite material prosthetic foot to overcome the disadvantages of prostheses set out above.

To this end, the invention relates to a prosthetic foot of composite material, comprising firstly a shaped heel "C", intended as a rear support of the prosthesis on the ground, the opening of the "C "being directed towards the rear of the prosthesis, and secondly a spatula having a front portion and a rear portion, the front portion of the tip being intended to serve as a support before the prosthesis against the ground, the heel being disposed below the rear portion of the spatula.

According to one embodiment, the heel may include an upper arm and a lower arm, both of substantially planar and parallel forms. The lower arm of the heel may be longer than the upper arm.

The spatula may have the shape of an "S" stretched compor¬ as a front portion, a rear portion and an intermediate portion having a zone of inflection of the curvature, the front portion of the tip may include a bottom surface substantially plane.

The tip and / or heel may comprise a plurali¬ side of carbon fiber layers, glass or aramid.

At least a portion of the layers of the tip fibers may be truncated at the front, so as to form a gradient of the thickness of the spatula.

All fiber layers of the tip and / or all of the heel of the fiber layers may be respectively covered (s) of at least one layer of woven then be impregnated material (s) and shaped.

The prosthesis may be arranged so that its attachment to the tibia takes place with a fastener passing through the upper arm of the bead and the rear portion of the tip and fixed in a connecting device mounted on a tibia .

The prosthesis may comprise a member arranged at the upper surface of the rear portion of the tip and intended to serve as attachment base of the prosthesis on the connecting member mounted on the tibia.

Brief description of drawings

The following description, given by way of example, refers to the drawing in which:

- Figure 1 is a perspective view three-quarter front of a schematic exemplary prosthetic foot according to the invention;

- Figure 2 is a side view of the prosthesis of Figure 1 coated with a cosmetic coating;

- Figure 3 is a perspective view illustrating the design of the tip of the prosthesis of Figure 1 in progress;

- Figure 4 is a view of prosthesis a schematic example profile according to the invention having a damping device of a first type;

- Figure 5 is a view of prosthesis a schematic example profile according to the invention comprising a shock absorber of a second type device; and

- Figure 6 is a plan view of prosthesis a schematic example profile according to the invention having a damping device of a third type.

Ways of carrying out the invention

The frame shown in Figure 1 includes a spatu¬ 1, a heel 2 and a plate 3 serving as the prosthesis fixing base to an artificial tibia. The tip 1 and the heel 2 are manufactured separately of a composite material and are assembled using a screw 4 at the fixation of the prosthesis to the artificial shin, the screws 4 passing through the upper arms 7 of the heel part back 11 of the spatula, and then the base plate 3 and is screwed into a connecting device, known in itself, attached to the tibia.

As can be seen in Figures 1 and 2, the profile of the tip recalls the shape of an "S" stretched, comprising a bearing portion 10, constituting the said spatula propre¬ ment, and a rear portion 11 substantially planar dimensions smaller than those of the front portion, the intermediate portion 13 connecting the front and rear portions having an area of ​​inflection of the curvature of the spatula. The bearing portion 10 of the tip 12 has a bottom surface substantially planar.

Trowel 1 comprises a plurality of layers of carbon fibers, glass fibers or aramid fibers disposed in the lengthwise and / or in the widthwise direction according to the desired degree of flexibility. Each layer having a thickness of about 0.5 mm is cut to the shape of the foot. The front portion of the upper layers is truncated gradient upwards, so as to gradually reduce the thickness of the tip between its front end and its rear end, as shown in Figure 3. The assembly is then covered with a or more layers of woven materials, e.g. tres¬ its carbon fiber or any other suitable fiber such as glass fibers or aramid fibers. The percentage of each kind of fiber and the direction of these fibers determines the different models of prosthesis according to the weight and the level of patient activity. Thus, for example, increase the poucentage glass fibers to increase the flexibility of the prosthesis or, on the contrary, increase the percentage of carbon fibers to decrease said flexibility. The assembly obtained is then treated with the RTM molding method (Resin Transfer Molding) method known per se, so as to impregnate all with epoxy resin by injection in a closed mold, while giving it the desired shape . The assembly is then cut at its ends according to the desired size and shape.

The bead 2 has the shape of a "C", the opening 5 is directed towards the rear of the prosthesis. It is en- disposed below the rear portion 11 of the spatula. According to a preferred embodiment, the two arms of the C are planar and parallel, the lower arm 6 being ment sensible¬ longer than the upper arm 7. The heel may be manufactured according to the same method as the spatula, to except that the fiber layers all have the same surface, that is to say that it is not necessarily provided a gradient of thickness. A circular hole 8 for handling the screw 4 is provided in the bottom arm 6 of the heel. This hole is dipose so that its center coincides with the axis 9 of the screw 4. The mounting base 3 may for example be machined in a plate of glass fiber / epoxy having a thickness of about four millimeters or molded from glass-carbon / epoxy. It can be attached to the upper rear end of the spatula by bonding, for example using an epoxy resin.

The combination of the form "C" heel and form "S" of the spatula actually allow versatile performance of the prosthetic foot of the invention. Must be emphasized here that the versatile properties result from structural characteristics of the prosthesis, while not employing only simple elements, that is to say without resorting to complex devices. Indeed, the heel-shaped "C" with its opening directed towards the rear, allows an adequate damping during normal walking. This amortization has fully and directe¬ ment of the nature and properties of the materials used, so that the response to stress is directly related to the solicitation itself and it is fully adapted consé¬ Quent, without sudden blockage or fixed stop. On the other hand, the shape "S" of the tip, with a front portion having a planar bottom surface, is particularly suitable for laying of the foot on a stair step. The shape "S" has a curved and against-curve for optimal energy restitution supplied to the prosthesis when the foot is supported on the step. This restitution is carried out in a way in two places by the double curve. On the other hand, the decrease in the thickness of the spatula forward it allows good flexibility of the forefoot during flexion of the foot. The implementation of more preformed curves has the advantage to print both a bending stress of the curve and a bending fighting against the curve. Depending on the nature of the solicitation, the division between the two types of bending will be different, but in all cases will result in a reaction harmo¬ nieuse offering the user a new comfort. Moreover, given its design, the connection area between the heel and 1 spatula 2 is not deformed and there is therefore no relative movement between the tip and tail in this area, so no friction this prevents squeak when walking.

It should also focus on the gradient of épais¬ ness that marks the front of the spatula. In fact, this gradient is used to trigger a stimulus effect with significant horizontal component. In fact, this part recreates the small pulse that normally give the toes when walking. This pulse allows reviving the member opposed to the revival of the whole body resulting from the middle part of the spatula.

The very small number of the components of the prosthesis has two advantages immediately noticeable. First, it must be pointed simplicity of fabrica¬ tion, installation and maintenance, and second, the extreme reliability of the whole. The technique of fabrica¬ tion as well as simplicity of form elements allow industrial production and consé¬ Quent a substantial reduction in manufacturing costs. Finally, and probably most important there, only implementing a limited number of pieces of simple shapes and not resorting to a technology fabrica¬ tion relatively simple, the prosthesis according to the invention offers really versatile usage characteristics, speaking in perfect harmony with each other, precisely because of the combination of simple lines and intimately fully complementary highlighting own performance materials used.

The prosthesis has been described above can be used as is, without a coating, as shown in Figure 1, or provided with a cosmetic coating 15 as shown in Figure 2. Thanks to the simplicity of the shapes of its components the prosthesis of the invention can be easily dressed and allows almost perfect reconstruc¬ tion of a foot, thanks to the narrowness of the prosthesis at the ankle. Foam filling 16 may be disposed in the limited volume on the one hand by the intermediate portion 13 of the tip and on the other by the bent part of the heel 2. foam filling may also be provided in the interior of the heel delimited by two arms 6, 7.

To further improve the comfort during the attack of the ground with the heel, a damping device, adjustable or not, may be inserted into the heel of the prosthesis so as to allow a progressive heel strike. This damping device can for example comprise a bearing plate independent basis connected to the heel by a damping element.

According to a first embodiment, shown in Figure 4, the damping device comprises a base support plate 41 disposed below the lower arm 6 of the heel and fixed to a damper cylinder 42, for example of polyurethane, mounted under the upper arm 7 of the heel.

According to a second embodiment, shown in Figure 5, the damping device comprises a base support plate 51 similar to plate 41 and arranged analogously. The plate 51 is soliodaire a damping element 52 integral with the upper arms 7 of the heel and having a spring 53.

According to a third embodiment, shown in Figure 6, the damper device comprises a support base plate 61 disposed below the lower arm 6 and the heel joint 62 mounted to the front portion of said lower arm 6. the plate 61 acts against a hydraulic shock absorber 64 secured to the bottom arm 6 of the heel. This damper may be adjustable via an adjustment device 65.

In all three cases described above, compensation may be diposée foam under the base support plate 41, 51, 61 to compensate for irregularities of the cosmetic coating.

Claims

1. Foot prosthesis of composite material, characterized in that it comprises on one hand a bead (2) in the shape of "C", intended as a rear support of the prosthesis on the ground, the opening ( 5) the "C" being directed towards the rear of the prosthesis, and secondly a spatula having a front portion (10) and a rear portion (11), the front portion (10) of the tip being intended to serve as a support before the prosthesis against the ground, the heel (2) being disposed en- below the rear portion (11) of the spatula.
2. A prosthesis foot according to claim 1, characterized in that the bead (2) comprises an upper arm (7) and a lower arm (6), both substantially planar and parallel forms.
3. A prosthesis according to claim 2, characterized in that the lower arm (6) of the bead is longer than the upper arm (7).
4. A prosthesis foot according to one of the preceding claims, characterized in that the spatula is shaped like "S" stretched, having a front part (10), a rear portion (11) and an intermediate portion (13) having an inflection of the curvature area.
5. A prosthesis foot according to claim 4, characterized in that the front part (10) of the spatula comprises a lower surface (12) substantially planar.
6. A prosthesis foot according to one of the preceding claims, characterized in that the tip and / or heel comprise (s) a plurality of layers of carbon fiber, glass or aramid.
7. A prosthesis foot according to claim 6, characterized in that at least part of the fiber layers of the tip is truncated at the front, so as to form a gradient of the thickness of the spatula.
8. A prosthesis foot according to one of Claims 6 or 7, characterized in that all the layers of fibers of the spatula and / or all of the layers of heel fibers is (are) respectively covered (s) at least one layer of woven material and is (are) impregnated (s) and shaped.
9. A prosthesis foot according to one of the preceding claims, characterized in that it is arranged so that the fixation of the prosthesis on the tibia takes place with the aid of a fastening element (4) passing through the upper arm (7) of the heel and the rear part (11) of the tip and fixed in a connecting device mounted on a tibia.
10. The prosthetic foot according to claim 9, characterized in that it comprises an element (3) disposed at the upper surface of the rear portion (11) of the tip and intended to serve as the prosthesis fixing base on connecting element mounted on the tibia.
11. The prosthetic foot according to one of the preceding claims, characterized in that a damping device, adjustable or not, is inserted in the heel of the prosthesis so as to allow a progressive heel strike.
12. The prosthetic foot according to claim 11, characterized in that the damping device comprises a bearing plate independent basis connected to the heel by a damping element.
PCT/CH1993/000254 1992-10-11 1993-11-05 Foot prosthesis WO1994010942A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH347192 1992-10-11
CH3471/92-9 1992-11-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19930923999 EP0625033A1 (en) 1992-10-11 1993-11-05 Foot prosthesis

Publications (1)

Publication Number Publication Date
WO1994010942A1 true WO1994010942A1 (en) 1994-05-26

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ID=4256684

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1993/000254 WO1994010942A1 (en) 1992-10-11 1993-11-05 Foot prosthesis

Country Status (3)

Country Link
EP (1) EP0625033A1 (en)
CA (1) CA2127691A1 (en)
WO (1) WO1994010942A1 (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0648479A1 (en) * 1993-10-14 1995-04-19 IPOS GMBH & CO. KG. Ankle spring module for leg prosthesis or artificial foot
US5425781A (en) * 1994-01-14 1995-06-20 Universite De Montreal Ankle connector for prosthetic foot
US5509937A (en) * 1994-01-14 1996-04-23 Universite De Montreal Prosthetic foot with enhanced heel control
GB2300986A (en) * 1995-05-15 1996-11-20 Asahi Kogaku Kk Optical data communication apparatus for printer
FR2734151A1 (en) * 1995-05-15 1996-11-22 Corima Reactive elastic construction for artificial foot prosthesis
US5746773A (en) * 1996-03-13 1998-05-05 United States Manufacturing Company C-shaped spring member for prosthetic limbs
EP0885600A2 (en) * 1997-04-24 1998-12-23 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Elastic spring insert for artificial foot
US5897594A (en) * 1996-03-04 1999-04-27 Otto Bock Orthopaedische Industrie Besitz-Und Jointless artificial foot
GB2361645A (en) * 2000-04-26 2001-10-31 Blatchford & Sons Ltd Prosthetic foot
US7364593B2 (en) * 2001-03-30 2008-04-29 Bioquest Prosthetics Llc Prosthetic foot with tunable performance
US7578852B2 (en) * 2001-03-30 2009-08-25 Bioquest Prosthetics, Llc Prosthetic foot with tunable performance and improved vertical load/shock absorption
US7794506B2 (en) * 2007-09-18 2010-09-14 Freedom Innovations, Llc Multi-axial prosthetic ankle
WO2010110637A1 (en) * 2009-03-26 2010-09-30 Ramiro Ruiz Cervantes Rebound device for lower-limb amputee prosthesis
US7955399B2 (en) 2004-04-01 2011-06-07 Bioquest Prosthetics, Llc Prosthetic foot with tunable performance
US8070829B2 (en) 2003-09-30 2011-12-06 Bioquest Prosthetics Llc Prosthetic foot with tunable performance
US8236062B2 (en) 2001-03-30 2012-08-07 Bioquest Prosthetics Llc Prosthetic foot with tunable performance
US8574314B2 (en) 2003-09-30 2013-11-05 Bioquest Prosthetics Llc Resilient prosthetic and orthotic components which incorporate a plurality of sagittally oriented struts
EP3203933A4 (en) * 2014-10-10 2018-07-04 C Lindhextend AB Prosthetic foot device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2626463A1 (en) * 1988-01-28 1989-08-04 Espace Composites Sarl Frame device for foot prosthesis
EP0401864A1 (en) * 1989-06-09 1990-12-12 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Jointless prosthetic foot
US5037444A (en) * 1989-01-05 1991-08-06 Phillips L Van Prosthetic foot
EP0487852A1 (en) * 1990-11-29 1992-06-03 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Jointless prosthetic foot
FR2673370A1 (en) * 1991-02-28 1992-09-04 Lehn Phillipe Van Foot prosthesis comprising an adjustable bladder and bladder usable in such a prosthesis.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2626463A1 (en) * 1988-01-28 1989-08-04 Espace Composites Sarl Frame device for foot prosthesis
US5037444A (en) * 1989-01-05 1991-08-06 Phillips L Van Prosthetic foot
EP0401864A1 (en) * 1989-06-09 1990-12-12 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Jointless prosthetic foot
EP0487852A1 (en) * 1990-11-29 1992-06-03 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Jointless prosthetic foot
FR2673370A1 (en) * 1991-02-28 1992-09-04 Lehn Phillipe Van Foot prosthesis comprising an adjustable bladder and bladder usable in such a prosthesis.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0625033A1 *

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0648479A1 (en) * 1993-10-14 1995-04-19 IPOS GMBH & CO. KG. Ankle spring module for leg prosthesis or artificial foot
US5425781A (en) * 1994-01-14 1995-06-20 Universite De Montreal Ankle connector for prosthetic foot
US5509937A (en) * 1994-01-14 1996-04-23 Universite De Montreal Prosthetic foot with enhanced heel control
GB2300986A (en) * 1995-05-15 1996-11-20 Asahi Kogaku Kk Optical data communication apparatus for printer
FR2734151A1 (en) * 1995-05-15 1996-11-22 Corima Reactive elastic construction for artificial foot prosthesis
US5897594A (en) * 1996-03-04 1999-04-27 Otto Bock Orthopaedische Industrie Besitz-Und Jointless artificial foot
US5746773A (en) * 1996-03-13 1998-05-05 United States Manufacturing Company C-shaped spring member for prosthetic limbs
EP0885600A2 (en) * 1997-04-24 1998-12-23 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Elastic spring insert for artificial foot
EP0885600A3 (en) * 1997-04-24 1999-01-20 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Elastic spring insert for artificial foot
US6077301A (en) * 1997-04-24 2000-06-20 Otto Bock Orthopaedische Industrie Besitz- und Verwaltungs-Kommandit-Gese llschaft Resilient foot insert for an artificial foot
GB2361645A (en) * 2000-04-26 2001-10-31 Blatchford & Sons Ltd Prosthetic foot
US6719807B2 (en) 2000-04-26 2004-04-13 Chas. A. Blatchford & Sons Ltd. Prosthetic foot
US7364593B2 (en) * 2001-03-30 2008-04-29 Bioquest Prosthetics Llc Prosthetic foot with tunable performance
US7578852B2 (en) * 2001-03-30 2009-08-25 Bioquest Prosthetics, Llc Prosthetic foot with tunable performance and improved vertical load/shock absorption
US7708784B2 (en) 2001-03-30 2010-05-04 Bioquest Prosthetics, Llc Prosthetic foot with tunable performance
US8236062B2 (en) 2001-03-30 2012-08-07 Bioquest Prosthetics Llc Prosthetic foot with tunable performance
US8070829B2 (en) 2003-09-30 2011-12-06 Bioquest Prosthetics Llc Prosthetic foot with tunable performance
US8574314B2 (en) 2003-09-30 2013-11-05 Bioquest Prosthetics Llc Resilient prosthetic and orthotic components which incorporate a plurality of sagittally oriented struts
US7955399B2 (en) 2004-04-01 2011-06-07 Bioquest Prosthetics, Llc Prosthetic foot with tunable performance
US7794506B2 (en) * 2007-09-18 2010-09-14 Freedom Innovations, Llc Multi-axial prosthetic ankle
WO2010110637A1 (en) * 2009-03-26 2010-09-30 Ramiro Ruiz Cervantes Rebound device for lower-limb amputee prosthesis
EP3203933A4 (en) * 2014-10-10 2018-07-04 C Lindhextend AB Prosthetic foot device
US10383746B2 (en) 2014-10-10 2019-08-20 C Lindhextend Ab Prosthetic foot device

Also Published As

Publication number Publication date
CA2127691A1 (en) 1994-05-26
EP0625033A1 (en) 1994-11-23

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