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WO2007071993A2 - Prothèse - Google Patents

Prothèse Download PDF

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Publication number
WO2007071993A2
WO2007071993A2 PCT/GB2006/004806 GB2006004806W WO2007071993A2 WO 2007071993 A2 WO2007071993 A2 WO 2007071993A2 GB 2006004806 W GB2006004806 W GB 2006004806W WO 2007071993 A2 WO2007071993 A2 WO 2007071993A2
Authority
WO
WIPO (PCT)
Prior art keywords
user
foot
prosthesis according
prosthesis
carrier
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/GB2006/004806
Other languages
English (en)
Other versions
WO2007071993A3 (fr
Inventor
Robert John Watts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of WO2007071993A2 publication Critical patent/WO2007071993A2/fr
Publication of WO2007071993A3 publication Critical patent/WO2007071993A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A61F2/66—Feet; Ankle joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/78—Means for protecting prostheses or for attaching them to the body, e.g. bandages, harnesses, straps, or stockings for the limb stump
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/78—Means for protecting prostheses or for attaching them to the body, e.g. bandages, harnesses, straps, or stockings for the limb stump
    • A61F2/80—Sockets, e.g. of suction type
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2002/5001—Cosmetic coverings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/5044—Designing or manufacturing processes
    • A61F2/5046—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, finite-element analysis or CAD-CAM techniques
    • A61F2002/5053—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, finite-element analysis or CAD-CAM techniques using a positive or a negative model, e.g. casting model or mould
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A61F2/66—Feet; Ankle joints
    • A61F2002/6614—Feet
    • A61F2002/6621—Toes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A61F2/66—Feet; Ankle joints
    • A61F2002/6614—Feet
    • A61F2002/665—Soles
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A61F2/66—Feet; Ankle joints
    • A61F2002/6614—Feet
    • A61F2002/6657—Feet having a plate-like or strip-like spring element, e.g. an energy-storing cantilever spring keel
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/78—Means for protecting prostheses or for attaching them to the body, e.g. bandages, harnesses, straps, or stockings for the limb stump
    • A61F2002/7881—Means for protecting prostheses or for attaching them to the body, e.g. bandages, harnesses, straps, or stockings for the limb stump using hook and loop-type fasteners

Definitions

  • This invention relates to prostheses, in particular to foot prostheses.
  • the first option previously proposed is problematic as the boots employed have very poor cosmesis. They are immediately identifiable as being “different”, and with children in particular this can be a cause of banule. It is also the case that to provide a stable platform the boot necessarily impairs motion, and the effect of this is that whilst the patient may subsequently be able to walk more normally than they otherwise would have been without the boot, their motion is impaired to the extent that they will typically not be able to walk quickly or run.
  • the boots are relatively heavy, again particularly for children, and cannot provide assistance when undertaking activities such as swimming.
  • the surgical option is inherently dangerous, as any surgical procedure is, and carries with it a host of associated psychological and physical drawbacks, the like of which are well known in the art. It is also the case that the surgical option is expensive, particularly when one considers that for a child the prosthesis will need to be regularly replaced until the child stops growing.
  • the present invention has been conceived with the aim of providing patients with an alternative to the options identified above.
  • a presently preferred embodiment of the present invention provides a foot prosthesis that comprises a resiliently flexible carrier comprising first and second portions respectively adapted to fit about a user's foot and lower leg, said first portion comprising an internal void shaped to fit closely about the user's foot, and said second portion being openable for the insertion of the user's foot and lower leg; means for securing the second portion about the user's lower leg; and a resiliently flexible member supported by said carrier to permit flexure of the member for energy storage during a heel-strike phase of the user's gait, and release of said stored energy during a toe-off phase of the user's gait.
  • a foot prosthesis comprising a silicone elastomer carrier supporting a carbon-fibre blade, the carrier including a first portion that is adapted to fit to the foot of a user and a second portion adapted to fit and be secured about the lower leg of said user, wherein said blade is supported by the portion of the carrier that is adapted to fit to the foot of the user such that the user bears on the blade to cause flexure of the blade during the heel-strike phase of the user's gait.
  • the blade may be supported so that the user bears indirectly on the blade in use.
  • Yet another aspect of the present invention provides a method of manufacturing a foot prosthesis, the method comprising: preparing a silicone elastomer having a desired flexibility; applying the silicone elastomer to a three- dimensional representation of a user's foot and lower leg to form a resilient carrier having a first portion adapted to fit about the user's foot and a second portion adapted to fit about the user's lower leg; supporting a resiliently flexible member in said carrier to permit flexure of the member for energy storage during a heel-strike phase of the user's gait, and release of said stored energy during a toe-off phase of the user's gait; and allowing the silicone elastomer to cure.
  • FIG. 1 is a schematic front perspective view of a prosthesis according to a preferred embodiment of the present invention
  • Fig. 2 is a schematic side elevation of the prosthesis depicted in Fig. 1 ; and Fig. 3 is a longitudinal cross-sectional view along the line A-A of Fig. 2.
  • the prosthesis 1 includes a first portion 3 that has been shaped and constructed to externally resemble a normal foot and ankle, and a second portion 5 that is configured to fit around the lower leg of the patient.
  • the first portion is shaped to include toes 7 and toenails 9, and both the first and second portions can be colour matched to the skin tones of the patient so that the prosthesis is virtually invisible when worn, at least to the casual observer.
  • the first portion 3 includes an internal void 11 that is shaped to match the external shape of the patient's abnormal foot.
  • the internal void is configured to match the external shape of the foot of a patient whose congenital transmetatarsal amputation exhibits the shortened foot structure that is typical of this condition.
  • the remainder 13 of the first portion is, in this embodiment, a resiliently flexible solid (i.e. a non-hollow body) and provides the additional bulk that is required to supplement the bulk provided by the patient's foot so that the external appearance of the prosthesis is like that of a normal foot.
  • a resiliently flexible solid i.e. a non-hollow body
  • the second portion 5 is generally tubular and is configured to fit closely around the lower leg of the patient.
  • the second portion is configured so that it can be opened, as will later be described, to allow the patient to put on the prosthesis and a closure is provided that allows the patient to secure the second portion of the prosthesis in a closed position about their lower leg once the prosthesis has been put on.
  • the internal void 11 includes a bottom wall 15 on which the patient's foot bears in use, and the prosthesis also includes an external sole portion 17.
  • a resiliently deformable blade 19 is embedded within the prosthesis between the bottom wall of the internal void 11 and the sole portion 17, and the provision of this blade is important as it is primarily the resilient nature of the blade that enhances the bio-mechanical properties of the prosthesis to the extent, in the case of one illustrative patient who had hitherto been unable to run, where energetic exercise becomes possible.
  • An advantage of embedding the blade within the first section is that flexible material of the first section cushions the patient's foot against the blade. This arrangement makes the device significantly more comfortable to wear as the patient's weight is not bearing directly on the blade.
  • the blade is shaped to provide stability to the patient whilst standing, and to provide an appropriate degree of flexure during the various phases of a patient's gait. For example, in the heel-strike phase of a patient's gait, the blade will tend to flex (as a result of the applied weight of the patient on the blade) so that a toe portion 21 of the blade moves relative to the remainder (in the direction generally indicated by arrow A) so that the blade assumes a more curved profile.
  • the material and thickness of the blade are chosen to suit the particular requirements of the patient. For example, for a lighter smaller patient the blade may be of a lighter material (so that the prosthesis is not overly tiring to wear), and more flexible (as the patient has less body weight to bring to bear on the blade). Conversely, for a larger heavier patient the blade may be of a heavier material and be less flexible (as the patient has more body weight to bring to bear on the blade). The amount of assistance required to provide a given patient with a normal gait will also need to be assessed before a particular blade material and thickness is chosen. The choice of blade material and thickness is therefore a matter of design choice for the prosthetist attending to a given patient and any of a number of conventional techniques can be used to assess each of the aforementioned factors.
  • the blade chosen comprised a 0.5 mm thick carbon-fibre plate manufactured by Otto Bock HealthCare GmbH (of Max-Nader-Str. 15, 37115 Duderstadt, Germany) and sold under the trade name "Springlite".
  • Carbon-fibre is a particularly suitable material for the blade as it is relatively light, relatively strong, and relatively flexible.
  • the blade could alternatively be of steel, but in this case it would be heavier, weaker and less flexible than a carbon-fibre equivalent.
  • the first and second portions of the prosthesis have two functions. Firstly they act as a flexible carrier for the blade 19, and secondly they function to provide the prosthesis with the external appearance of a normal foot and ankle. In a marked departure from the essentially rigid boots (described above) that have previously been proposed, the flexible nature of the first and second portions enhances the energy storage capacity of the prosthesis as a whole.
  • the first and second portions are sufficiently rigid to maintain the external appearance of a normal foot, and sufficiently flexible to allow the prosthesis to flex and store energy - and any internal structure that provides this functionality may be adopted. In most cases the first and second portions are more flexible than the blade.
  • first and second portions of the prosthesis are of a resiliently flexible material, such as silicone.
  • the silicone may have a hardness of 20 to 60 shore, most preferably 20 to 40 shore.
  • the first and second portions are of 20 to 35 shore A durometer silicone elastomer, preferably 20 or 35 shore silicone elastomer.
  • the entirety of the first and second portions may have substantially the same flexibility, or in a modification regions of the first and second portions may be more or less flexible than others to allow, for example, flexing to differing degrees to mimic more accurately the external appearance of a normal foot as it flexes.
  • Silicone is particularly preferred as a material for the first and second portions as it can readily be coloured, and as such can readily be colour matched to the patient's skin tones.
  • first and second portions could be of neoprene or other equivalent material.
  • the first and second portions may also be of another material, such as neoprene, that is provided with an outer layer of silicone, or indeed of silicone provided with an outer layer of another material.
  • the prosthesis may be manufactured by injection moulding or by milling (as described below) and subsequently building up layers of silicone elastomer upon a suitable cast (typically of a patient's foot and lower leg).
  • a first step is to take a cast of the patient's abnormal foot, and from this produce a positive impression that conforms at least substantially to the external shape of the patient's foot.
  • the next step in the process is to apply to this positive impression successive layers of silicone elastomer of the appropriate hardness to define, inter alia, the void in which the patient's foot will fit.
  • a blade is affixed to the silicone structure and additional elastomer is then applied over the blade so that it becomes embedded within the first portion.
  • the external shape of the first portion may be chosen to mimic that of the patient's good foot by taking a series of measurements of the good foot and building up layers of silicone until the external size and shape of the prosthesis, particularly the first portion thereof, is compatible with that of the patient's normal foot.
  • the prostheses may be constructed to a reference size appropriate for the height of the patient.
  • silicone elastomer is a particularly preferred material.
  • Two suitable elastomers are sold under the product names HCR9960 and MED4035 by Nusil Technology of 1050 Cindy Lane, Carpinteria, California, USA.
  • Another family of suitable elastomers are sold by Nusil Technology under the registered trademark VersaSil 3® .
  • HCR9960 has a working time of approximately 1 :2 hours and MED4035 has a shorter working time of approximately 3 to 4 hours, after which the elastomer cures.
  • the elastomers are thermo-setting and are strained through a 200 mesh screen to remove particulate contaminants.
  • the elastomers are supplied as A and B components which are preferably combined in equal portions on a two roll mill, or other suitable device, prior to use.
  • a suggested sequence for blending the two components is to first soften part B on the mill and then soften part A, after which an equal weight of part B should be added to part A and then thoroughly mixed. At this stage, it is recommended to keep the temperature of the material as low as possible so as to maximise the table life of the elastomer.
  • the mixture may then be manually fitted to a cast of a patient's foot, or supplied to injection moulding apparatus to mould a suitably shaped prosthesis. Curing of the blended elastomer may be accelerated by heat and can take from 3 to 4 hours. The cure may be inhibited by any ambient traces of organic rubbers and other substances and thus it is important for the fabrication of the structure to be conducted in a thoroughly cleaned area.
  • the VersaSil 3® family of elastomers include 3 base stocks which when vulcanised produce tough, durable elastomers with Shore A durometers of 30, 50 and 70, and the base stocks can be blended to produce elastomers of intermediate durometer.
  • the three base stocks are compounded with CAT-40 and CAT-55 - CAT- 40 being an inhibitor, and CAT-55 being a platinum catalyst.
  • Each series i.e. 30, 50 or 70 durometer
  • Elastomers of intermediate durometer can be produced by blending 30, 50 or 70 durometer elastomers in a 1 :1 ratio.
  • a 40 durometer elastomer can be achieved by blending VersaSil 3® 30 and VersaSil 3® 50 in a 1 :1 ratio mix.
  • Curing of the resulting mixture is accelerated by heat.
  • the elastomer will cure in a mould cross-section up to 0.075 inch (0.00195m) thick in less than ten minutes at 116°C.
  • the vulcanisation rate can be increased by increasing the cure temperature, and an optional post cure, such as four hours at 177°C may be implemented if desired.
  • cure of the elastomer may be inhibited by traces of amines, sulphur, nitrogen oxide, organo-tin compounds and carbon monoxide. As such it is important for manufacture of the structure to be conducted in a thoroughly clean environment.
  • the second portion 5 is longitudinally split to define an insertion slit (not visible) that runs longitudinally down the second portion in that region of the prosthesis which will overlie the rear of the patient's lower leg in use.
  • the insertion slit allows the second portion 5 to be opened so that a patient can insert their foot into the first portion and their lower leg into the second portion.
  • the second portion to one side of the insertion slit is provided with one or more tab portions 23 (in this instance three tab portions are provided) that extend from the edge of the slit and carry, on at least a portion of their underside, hooks or loops of a mechanical hook and loop closure (such as velcro ® ).
  • the second portion to the other side of the insertion slit is provided with one or more regions of complementary loops or hooks of the mechanical hook and loop closure embedded within the wall of the second portion.
  • the second portion may include a zip fastener (with respective parts of the fastener being attached to respective edges of the insertion slit) or a piece of elastic fabric attached to either side of the insertion slit, the fabric enabling the slit to be opened to permit the prosthesis to be put on, and serving to draw the edges of the slit together once the prosthesis has been put on to secure the prosthesis about the foot and lower leg of the patient.
  • a zip fastener with respective parts of the fastener being attached to respective edges of the insertion slit
  • a piece of elastic fabric attached to either side of the insertion slit
  • the prosthesis disclosed herein provides significant biomechanical improvements (in terms of flexure and resultant energy storage) to the typical rigid boot of the type previously proposed. These improvements make it significantly easier for the patient to walk, and may allow the patient to undertake vigorous activity. Indeed, tests with one patient have shown that where that patient could only previously walk with some difficultly, they are now freely able to run and, for the first time, partake in sporting activities. It is also the case that the prosthesis of the type disclosed herein is significantly more cosmetically pleasing than the rigid boot of the type previously proposed.
  • the first portion is non-hollow, it will be appreciated by those persons of ordinary skill in the art that it is only important for the prosthesis to look like and function as a foot, and as such it is possible for the first portion to comprise a hollow outer shell within which internal walls define the void that is shaped to match the exterior shape of the patient's foot.
  • the closure for the second portion is integrated within the body of the prosthesis, it will be apparent to persons skilled in the art that the closure may comprise one or more discrete straps that are adapted to be secured around the periphery of the second portion to hold the second portion to the lower leg of the patient.
  • a strengthening rib running up the dorsal aspect of the foot and the front of the shin may be included in the first and second portions to transfer applied loads to the shin and thereby avoid applying such loads to the stump.
  • the rib could conveniently be of silicone elastomer, for example 60 to 80 shore, preferably 70 shore, silicone elastomer.
  • the flexible member in another modification, whilst it is preferred for the flexible member to be embedded or supported in the carrier it will be appreciated that the flexible member need not be wholly embedded or supported within the carrier.
  • the flexible member could instead be supported (wholly or partly) by the carrier so that the patient bears directly on at least part of the flexible member.

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  • Health & Medical Sciences (AREA)
  • Transplantation (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Prostheses (AREA)

Abstract

L’invention concerne une prothèse de pied 1 qui consiste en: un support élastique flexible qui comprend une première (3) et une deuxième (5) portions conçues respectivement pour entourer parfaitement le pied et la partie inférieure de la jambe d'un utilisateur, ladite première portion (3) comprenant un vide interne (11) façonné pour s’ajuster parfaitement autour du pied de l'utilisateur, et ladite deuxième portion (5) pouvant s’ouvrir pour y insérer le pied et la partie inférieure de la jambe de l'utilisateur ; des moyens (23) pour fixer la deuxième portion (5) autour de la partie inférieure de la jambe de l'utilisateur; et un membre élastiquement flexible (19) supporté par ledit support afin de permettre la flexion du membre pour emmagasiner de l'énergie pendant une phase de pose du talon au cours du déplacement de l'utilisateur, et pour libérer ladite énergie stockée pendant une phase de soulèvement de l'avant du pied durant le déplacement de l'utilisateur.
PCT/GB2006/004806 2005-12-20 2006-12-19 Prothèse Ceased WO2007071993A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0525882A GB2433443B (en) 2005-12-20 2005-12-20 Prosthesis
GB0525882.7 2005-12-20

Publications (2)

Publication Number Publication Date
WO2007071993A2 true WO2007071993A2 (fr) 2007-06-28
WO2007071993A3 WO2007071993A3 (fr) 2007-08-23

Family

ID=35840761

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2006/004806 Ceased WO2007071993A2 (fr) 2005-12-20 2006-12-19 Prothèse

Country Status (2)

Country Link
GB (1) GB2433443B (fr)
WO (1) WO2007071993A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013116878A1 (fr) * 2012-02-02 2013-08-08 Nordman Elwin Isaac Coque de pied prothétique permettant une conversion rapide entre la marche en chaussures et pieds nus
EP2809275A4 (fr) * 2012-02-02 2016-05-11 Nordman Elwin Isaac Coque de pied prothétique permettant une conversion rapide entre la marche en chaussures et pieds nus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013116878A1 (fr) * 2012-02-02 2013-08-08 Nordman Elwin Isaac Coque de pied prothétique permettant une conversion rapide entre la marche en chaussures et pieds nus
EP2809275A4 (fr) * 2012-02-02 2016-05-11 Nordman Elwin Isaac Coque de pied prothétique permettant une conversion rapide entre la marche en chaussures et pieds nus

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GB2433443A (en) 2007-06-27
GB0525882D0 (en) 2006-02-01
WO2007071993A3 (fr) 2007-08-23

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