WO2006107329A1 - Prothese de pied a performances reglables - Google Patents

Prothese de pied a performances reglables Download PDF

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Publication number
WO2006107329A1
WO2006107329A1 PCT/US2005/034037 US2005034037W WO2006107329A1 WO 2006107329 A1 WO2006107329 A1 WO 2006107329A1 US 2005034037 W US2005034037 W US 2005034037W WO 2006107329 A1 WO2006107329 A1 WO 2006107329A1
Authority
WO
WIPO (PCT)
Prior art keywords
foot
calf shank
prosthetic foot
shank
keel
Prior art date
Application number
PCT/US2005/034037
Other languages
English (en)
Inventor
Barry W. Townsend
Byron K. Claudino
Original Assignee
Townsend Barry W
Claudino Byron K
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 claimed from PCT/US2005/011291 external-priority patent/WO2005097009A1/fr
Application filed by Townsend Barry W, Claudino Byron K filed Critical Townsend Barry W
Publication of WO2006107329A1 publication Critical patent/WO2006107329A1/fr

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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
    • A61F2/76—Means for assembling, fitting or testing prostheses, e.g. for measuring or balancing, e.g. alignment means
    • 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
    • A61F2/6607—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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The 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
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
    • 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
    • A61F2002/5016—Prostheses not implantable in the body adjustable
    • A61F2002/502—Prostheses not implantable in the body adjustable for adjusting length
    • 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
    • A61F2002/5016—Prostheses not implantable in the body adjustable
    • A61F2002/503—Prostheses not implantable in the body adjustable for adjusting elasticity, flexibility, spring rate or mechanical tension
    • 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
    • A61F2002/5072—Prostheses not implantable in the body having spring elements
    • A61F2002/5079—Leaf springs
    • 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
    • A61F2002/5081—Additional features
    • A61F2002/5083—Additional features modular
    • 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
    • A61F2002/607—Lower legs
    • 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
    • A61F2002/6635—Metatarsals
    • 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
    • A61F2002/6642—Heels
    • 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
    • A61F2002/6685—S-shaped
    • 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
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws

Definitions

  • the present invention relates to a high performance prosthetic foot providing improved dynamic response capabilities as these capabilities relate to applied force mechanics.
  • a jointless artificial foot for a leg prosthesis is disclosed by Martin et al. in U.S. Patent No. 5,897,594.
  • the jointless artificial foot of Martin et al. employs a resilient foot insert which is arranged inside a foot molding.
  • the insert is of approximately C-shaped design in longitudinal section, with the opening to the rear, and takes up the prosthesis load with its upper C-limb and via its lower C-limb transmits that load to a leaf spring connected thereto.
  • the leaf spring as seen from the underside is of convex design and extends approximately parallel to the sole region, forward beyond the foot insert into the foot-tip region.
  • the invention is based on the object of improving the jointless artificial foot with regard to damping the impact of the heel, the elasticity, the heel-to- toe walking and the lateral stability, in order thus to permit the wearer to walk in a natural manner, the intention being to allow the wearer both to walk normally and also to carry out physical exercise and to play sports.
  • the dynamic response characteristics of this known artificial foot are limited and do not mimic the human biomechanical function of the human foot, ankle and shank and soft supporting tissue.
  • the artificial foot of Martin et al. and other prior art prosthetic feet that utilize this ankle design and a rigid pylon as a shank cannot store enough elastic energy to create normal ankle joint sagittal plane kinetic power in gait. Tests have shown that prior art prosthetic feet with such designs produce only about 25% of normal ankle joint sagittal plane kinetic power in gait.
  • the prosthetic foot of the invention comprises a longitudinally extending foot keel having a forefoot portion at one end, a hindfoot portion at an opposite end and a relatively long midfoot portion extending between and upwardly arched from the forefoot and hindfoot portions.
  • a calf shank including a downward convexly curved lower end is also provided.
  • An adjustable fastening arrangement attaches the curved lower end of the calf shank to the upwardly arched midfoot portion of the foot keel to form an ankle joint area of the prosthetic foot.
  • the calf shank is a resilient member which forms an ankle and a shank of the prosthesis, the resilient member extending upward from the foot keel by way of an anterior facing convexly curved portion of the member.
  • the mechanical form's angular velocity increases in response to compressing force in late mid-stance loading.
  • ankle joint sagittal plane kinetic power of the prosthesis in gait is improved.
  • the adjustable fastening arrangement permits adjustment of the alignment of the calf shank and the foot keel with respect to one another in the longitudinal direction of the foot keel for tuning the performance of the prosthetic foot.
  • the dynamic response characteristics and motion outcomes of the foot are changed to be task specific in relation to the needed/desired horizontal and vertical linear velocities.
  • a multi-use prosthetic foot is disclosed having high and low dynamic response capabilities, as well as biplanar motion characteristics, which improve the functional outcomes of amputees participating in activities of daily living, sporting and/or recreational activities.
  • a prosthetic foot especially for sprinting is also disclosed.
  • the calf shank in several embodiments has its lower end reversely curved in the form of a spiral with the calf shank extending upward anteriorly from the spiral to an upstanding upper end thereof. This creates a calf shank with an integrated ankle at the lower end thereof, when the calf shank is secured to the foot keel, with a variable radii response outcome similar to a parabola-shaped calf shank of the invention.
  • the calf shank with spiral lower end is secured to the foot keel by way of a coupling element.
  • the coupling element can include a stop to limit dorsiflexion of the calf shank in gait.
  • the coupling element is monolithically formed with the forefoot portion of the foot keel.
  • the coupling element extends posteriorly as a cantilever over the midfoot . portion and part of the hindfoot portion of the foot keel.
  • the coupling element can be reversely curved upwardly to form an anterior facing concavity in which the lower end of the calf shank is housed, the reversely curved lower end of the calf shank being supported at its end from the coupling element.
  • the resulting prosthesis has improved efficiency.
  • the prosthesis according to a further feature of the invention can include a posterior calf device to store additional energy with anterior motion of the upper end of the calf shank and/or to limit the anterior motion of the upper end of the calf shank.
  • the device includes an elongated member in the form of a cable which is connected with play between the upper end of the calf shank and the lower portion of the prosthesis with the cable being tensioned only when a force loading on the calf shank is greater than that encountered in a normal gait cycle, preferably only when the force loading is greater than 120% of body weight of the user.
  • a resilient bumper in the device absorbs shock and stores energy when the cable is tensioned as, for example, by higher level activity, e.g., running, jumping, etc., by the user.
  • Fig. 1 is a schematic illustration representing the two adjacent radii of curvatures Ri and R 2 , one against the other, of a foot keel and calf shank of a prosthetic foot of the invention which creates a dynamic response capability and motion outcome of the foot in gait in the direction of arrow B which is perpendicular to the tangential line A connecting the two radii.
  • Fig. 2 is a view similar to Fig. 1 but showing the alignment of the two radii having been changed in the prosthetic foot according to the invention to increase the horizontal component and decrease the vertical component of the dynamic response capability and motion outcome of the foot in gait so that arrow B-i, perpendicular to tangential line A 1 , is more horizontally directed than is the case depicted in Fig. 1.
  • Fig. 3 is a side view of a prosthetic foot according to an example embodiment of the invention with pylon adapter and pylon connected thereto for securing the foot to the lower leg of an amputee.
  • Fig. 4 is a front view of the prosthetic foot with pylon adapter and pylon of Fig. 3.
  • Fig. 5 is a top view of the embodiment of Figs. 3 and 4.
  • Fig. 6 is a side view of another foot keel of the invention, especially for sprinting, which may be used in the prosthetic foot of the invention.
  • Fig. 7 is a top view of the foot keel of Fig. 6.
  • Fig. 8 is a bottom view of the foot keel in the prosthetic foot in Fig. 3 which, provides high low dynamic response characteristics as well as biplanar motion capabilities.
  • Fig. 9 is a side view of an additional foot keel of the invention for the prosthetic foot particularly useful for sprinting by an amputee that has had a
  • Fig. 10 is a top view of the foot keel of Fig. 9.
  • Fig. 11 is a further variation of foot keel for the prosthetic foot of the invention for a Symes amputee, the foot keel providing the prosthetic foot with high low dynamic response characteristics as well as biplanar motion capabilities.
  • Fig. 12 is a top view of the foot keel of Fig. 11.
  • Fig. 13 is a side view of a foot keel of the invention wherein the thickness of the keel tapers, e.g., is progressively reduced, from the midfoot portion to the hindfoot portion of the keel.
  • Fig. 14 is a side view of another form of the foot keel wherein the thickness tapers from the midfoot toward both the forefoot and hindfoot of the keel.
  • Fig. 15 is a side view from slightly above and to the front of a parabola shaped calf shank of the prosthetic foot of the invention, the thickness of the calf shank tapering toward its upper end.
  • Fig. 16 is a side view like Fig. 15 but showing another calf shank tapered from the middle towards both its upper and lower ends.
  • Fig. 17 is a side view of a C-shaped calf shank for the prosthetic foot, the calf shank thickness tapering from the middle towards both its upper and lower ends.
  • Fig. 18, is a side view of another example of a C-shaped calf shank for the prosthetic foot, the thickness of the calf shank being progressively reduced from its midportion to its upper end.
  • Fig. 19 is a side view of an S-shaped calf shank for the prosthetic foot, both ends being progressively reduced in thickness from the middle thereof.
  • Fig. 20 is a further example of an S-shaped calf shank which is tapered in thickness only at its upper end.
  • Fig. 21 is a side view of a J-shaped calf shank, tapered at each end, for the prosthetic foot of the invention.
  • Fig. 22 is a view like Fig. 21 but showing a J-shaped calf shank which is progressively reduced in thickness towards only its upper end.
  • Fig. 23 is a side view, from slightly above, of a metal alloy or plastic coupling element used in the adjustable fastening arrangement of the invention for attaching the calf shank to the foot keel as shown in Fig. 3.
  • Fig. 24 is a view from the side and slightly to the front of a pylon adapter used on the prosthetic foot of Figs. 3-5, and also useful with the foot of Figs. 28 and 29, for connecting the foot to a pylon to be attached to an amputee's leg.
  • Fig. 25 is a side view of another prosthetic foot of the invention similar to that in Fig. 3, but showing use of a coupling element with two releasable fasteners spaced longitudinally connecting the element to the calf shank and foot keel, respectively.
  • Fig. 26 is an enlarged side view of the coupling element in Fig. 25.
  • Fig. 27 is an enlarged side view of the calf shank of the prosthetic foot of Fig. 25.
  • Fig. 28 is a side view of another embodiment of the prosthetic foot wherein the calf shank is utilized within a cosmetic covering.
  • Fig. 29 is a top view of the prosthetic foot in Fig. 28.
  • Fig. 30 is a cross-sectional view of the prosthetic foot of Figs. 28 and
  • Figs. 31 A and 31 B are sectional views of wedges of different thicknesses which may be used in the dorsiflexion stop of the coupling element as shown in Fig. 30.
  • Fig. 32 is a side view of a further embodiment of the prosthetic foot wherein the lower end of the calf shank is reversely curved in the form of a spiral and housed within and supported by a coupling element monolithically formed with the forefoot portion of the foot keel.
  • Fig. 33 is a front view of the prosthesis of Fig. 32.
  • Fig. 34 is a rear view of the prosthesis of Fig. 32.
  • Fig. 35 is a side view of another embodiment of the prosthesis wherein a posterior component of the foot keel is joined to the reversely curved upper end of the coupling element which is monolithically formed with the forefoot portion of the foot keel.
  • Fig. 36 is a side view of another form of the invention wherein the coupling element is monolithically formed with the foot keel.
  • Fig. 37 is a side view of a still further variation of the prosthesis of the invention wherein the coupling element is joined at a posterior end thereof to the foot keel by a fastener.
  • Fig. 38 is a side view of another embodiment of the prosthesis showing the coupling element joined to the foot keel at the posterior end of the foot keel.
  • Fig. 39 is a side view of the calf shank and posterior calf device of the embodiments of Figs. 35-38 shown disassembled from the foot keel and its coupling element.
  • Fig. 40 is a perspective from the left side and to the rear of a prosthetic foot of an additional embodiment of the invention combining features of several other embodiments.
  • Fig. 41 is a side view of another embodiment of the prosthetic foot of the invention with posterior calf device.
  • Fig. 42 is a rear view of the prosthetic foot, taken from the right side of the prosthesis shown in Fig. 41.
  • Fig. 43 is a perspective from the left side and to the rear of the prosthetic foot in Fig. 41 with several parts thereof shown disassembled.
  • Fig. 44 is a cross sectional view along the longitudinal center line of a lower cable block of the posterior calf device depicting the lower end of the cable of the device extending longitudinally slidably through an aperture of the block and retained therein by a connector swaged on the lower end of the cable with a resilient bumper being provide on the cable between the connector and the block.
  • a prosthetic foot 1 in the example embodiment of Figures 3-5 is seen to comprise a longitudinally extending foot keel 2 having a forefoot portion 3 at one end, a hindfoot portion 4 at an opposite end and an upwardly arched midfoot portion 5 extending between the forefoot and hindfoot portions.
  • the midfoot portion 5 is upward convexly curved over its entire longitudinal extent between the forefoot and hindfoot portions in the example embodiment.
  • An upstanding calf shank 6 of the foot 1 is attached at a portion of a downward convexly curved lower end 7 thereof to a proximate, posterior surface of the keel midfoot portion 5 by way of a releasable fastener 8 and coupling element 11.
  • the fastener 8 is a single bolt with nut and washers in the example embodiment, but could be a releasable clamp or other fastener for securely positioning and retaining the calf shank on the foot keel when the fastener is tightened.
  • a longitudinally extending opening 9 is formed in a proximate, posterior surface of the keel midfoot portion 5, see Figure 8.
  • a longitudinally extending opening 10 is also formed in the curved lower end 7 of the calf shank 6 like that shown in Figure 15, for example.
  • the releasable fastener 8 extends through the openings 9 and 10 which permit adjusting the alignment of the calf shank and the foot keel with respect to one another in the longitudinal direction, A-A in Figure 5, when the fastener 8 is loosened or released for tuning the performance of the prosthetic foot to be task specific.
  • the fastener 8, coupling element 11 and longitudinally extending openings 9 and 10 constitute an adjustable fastening arrangement for attaching the calf shank to the foot keel to form an ankle joint area of the prosthetic foot.
  • the alignment capability of the calf shank and foot keel in the prosthetic foot of the invention allows the radii to be shifted so that horizontal or vertical linear velocities with the foot in athletic activities are affected.
  • an alignment change can be made to affect the relationship of the calf shank's radius and the foot keel radius. That is, to improve the horizontal linear velocity characteristic, the bottom radius R 2 , of the foot keel, is made more distal than its start position, Figure 2 as compared with Figure 1. This changes the dynamic response characteristics and motion outcomes of the foot 1 to be more horizontally directed and as a result greater horizontal linear velocity can be achieved with the same applied forces.
  • the amputee can, through practice, find a setting for each activity that meets his/her needs as these needs relate to horizontal and vertical linear velocities.
  • the coupling element 11 is a plastic or metal alloy alignment coupling (see Figures 3, 4 and 23) sandwiched between the attached foot keel 2 and calf shank 6.
  • the releasable fastener 8 extends through a hole 12 in the coupling element.
  • the coupling element extends along the attached portion of the calf shank and the proximate, posterior surface of the keel midfoot portion 5.
  • the curved lower end 7 of the calf shank 6 is in the shape of a parabola with the smallest radius of curvature of the parabola located at the lower end and extending upwardly, and initially anteriorly in the parabola shape.
  • a posteriorly facing concavity is formed by the curvature of the calf shank as depicted in Figure 3.
  • the parabola shape is advantageous in that it has increased dynamic response characteristics in creating both improved horizontal linear velocity associated with the relatively larger radii proximal terminal end thereof, while having a smaller radius of curvature at its lower end for quicker response characteristics.
  • the larger radii of curvature at the upper end of the parabola shape enable the tangential line A, explained with reference to Figures 1 and 2, to remain more horizontally oriented with changes in alignment, which creates improved horizontal linear velocity.
  • the parabolic shaped calf shank responds to initial contact ground forces in human gait by compressing or coiling in on itself. This makes the radii of the parabola curve smaller, and as a consequence, the resistance to compression is decreased.
  • GRFs heel off ground reaction forces
  • GRFs by eccentrically contracting to lower the foot to the ground and a dorsiflexion moment is created. From foot flat to toe off the larger posterior calf muscle group responds to GRFs also by eccentrically contracting and a greater plantar flexion moment is created. This moment size relates to the calf anterior and posterior muscle group difference in size.
  • the prosthetic calf shank's resistance to the dorsiflexion and plantar flexion moments in human gait are mimicked and normal gait is achieved.
  • the parabolic curves variable resistance capability mimics the human calf musculature function in human gait and running and jumping activities, and as a consequence prosthetic efficiency is achieved.
  • a prosthetic foot according to the invention produced 86% of non- pathological human ankle joint kinetic power generation, more than twice that obtained in tests of a conventional prosthetic foot of the aforementioned type having a posterior facing, convexly-curved ankle and shank. It is believed that at least one factor in this dramatic improvement in sagittal plane kinetic power generated by the prosthesis of the invention is that with the invention's anterior convexly curved resilient ankle and integral resilient shank, angular velocity is increased in response to compressing force in late mid-stance loading whereas in the prior art prosthesis angular velocity is decreased in response to such loading. This improvement with the present invention lowers the energy expenditure by a user for walking, increases walking speed and allows a more normal gait.
  • a human being walks at approximately three miles per hour.
  • a 4:00 minute miler runs at 12 miles per hour and a 10 second, 100 meter sprinter sprints at 21 miles per hour. This is a 1 to 4 to 7 ratio.
  • the horizontal component of each task is greater as the velocity of the activity increases.
  • the size of the prosthetic calf shank radii can be predetermined.
  • a walker needs a smaller radii parabolic curved calf shank than a miler and a sprinter.
  • a sprint runner needs a parabolic curved calf shank that is seven times as large. This relationship shows how to determine the parabolic radii for walkers, runners and sprinters.
  • a pylon adapter 13 is connected to the upper end of the calf shank 6 by fasteners 14. The adapter 13 in turn is secured to the lower end of pylon
  • Pylon 15 is secured to the lower limb of the amputee by a supporting structure (not shown) attached to the leg stump.
  • the forefoot, midfoot and hindfoot portions of the foot keel 2 are formed of a single piece of resilient material in the example embodiment.
  • a solid piece of material, plastic in nature, having shape-retaining characteristics when deflected by the ground reaction forces can be employed.
  • the foot keel and also the calf shank can be formed of laminated composite material having reinforcing fiber laminated with polymer matrix material.
  • a high strength graphite, laminated with epoxy thermosetting resins, or extruded plastic utilized under the tradename of Delran, or degassed polyurethane copolymers may be used to form the foot keel and also the calf shank.
  • the functional qualities associated with these materials afford high strength with low weight and minimal creep.
  • thermosetting epoxy resins are laminated under vacuum utilizing prosthetic industry standards.
  • the polyurethane copolymers can be poured into negative molds and the extruded plastic can be machined.
  • Each material of use has its advantages and disadvantages.
  • the laminated composite material for the foot keel and the calf shank can also advantageously be a thermo-formed (prepreg) laminated composite material manufactured per industry standards, with reinforcing fiber and a thermoplastic polymer matrix material for superior mechanical expansion qualities.
  • preg thermo-formed laminated composite material manufactured per industry standards, with reinforcing fiber and a thermoplastic polymer matrix material for superior mechanical expansion qualities.
  • a suitable commercially available composite material of this kind is CYLON ® made by Cytec Fiberite Inc. of Havre de Grace, Maryland.
  • the foot keel and calf shank in this and the other embodiments disclosed herein can be made of resilient metal alloy, for example, of grade 5 titanium alloy which has been solution heat treated and over aged (STOA) and shot peened with specifications that increase the fatigue life through the addition of compressive stresses on the surface.
  • STOA solution heat treated and over aged
  • the resilient material's physical properties as they relate to stiffness, flexibility and strength are all determined by the thickness of the material. A thinner material will deflect easier than a thicker material of the same density.
  • the material utilized, as well as the physical properties, are associated with the stiffness to flexibility characteristics in the prosthetic foot keel and calf shank.
  • the thickness of the foot keel and calf shank are uniform or symmetrical in the example embodiment of Figures 3-5, but the thickness along the length of these components can be varied as discussed below, such as by making the hindfoot and forefoot areas thinner and more responsive to deflection in the midfoot region.
  • the midfoot portion 5 is formed by a longitudinal arch such that the medial aspect of the longitudinal arch has a relatively higher dynamic response capability than the lateral aspect of the longitudinal arch.
  • the medial aspect of the longitudinal arch concavity is larger in radius than the lateral aspect thereof.
  • the interrelationship between the medial to lateral radii size of the longitudinal arch concavity of the midfoot portion 5 is further defined as the anterior posterior plantar surface weight bearing surface areas of the foot keel 2.
  • the line T 1 -T2 on the anterior section of 5 in Fig. 8 represents the anterior plantar surface weight bearing area.
  • Line P 1 -P 2 represents the posterior plantar weight-bearing surface of 5.
  • the plantar weight bearing surfaces on the lateral side of the foot would be represented by the distance between T 1 - P- I .
  • the plantar weight bearing surfaces on the medial side of the foot 2 are represented by the distance between P 2 -T 2 .
  • T 1 -P 1 and P 2 -T 2 determine the radii size, and as a result the high low dynamic response interrelationship is determined and can be influenced by converging or diverging these two lines T1-T2 to P 1 -P2. As a result, high low dynamic response can be determined in structural design.
  • the posterior end 17 of the hindfoot portion 4 is shaped in an upwardly curved arch that reacts to ground reaction forces during heel strike by compressing for shock absorption.
  • the heel formed by the hindfoot portion 4 is formed with a posterior lateral corner 18 which is more posterior and lateral than the medial corner 19 to encourage hindfoot eversion during initial contact phase of gait.
  • the anterior end 20 of the forefoot portion 3 is shaped in an upwardly curved arch to simulate the human toes being dorsiflexed in the heel rise toe off position of the late stance phase of gait. Rubber or foam pads 53 and 54 are provided on the lower forefoot and hindfoot as cushions.
  • Improved biplanar motion capability of the prosthetic foot is created by medial and lateral expansion joint holes 21 and 22 extending through the forefoot portion 3 between dorsal and plantar surfaces thereof.
  • Expansion joints 23 and 24 extend forward from respect ones of the holes to the anterior edge of the forefoot portion to form medial, middle and lateral expansion struts 25-27 which create improved biplanar motion capability of the forefoot portion of the foot keel.
  • the expansion joint holes 21 and 22 are located along a line, B-B in Figure 5, in the transverse plane which extends at an angle ⁇ of 35° to the longitudinal axis A-A of the foot keel with the medial expansion joint hole 21 more anterior than the lateral expansion joint hole 22.
  • the angle ⁇ of line B-B to longitudinal axis A-A in Figure 5 can be as small as 15° and still derive a high low dynamic response. As this angle ⁇ changes, so should the angle Z of the line T 1 -T 2 in Figure 8.
  • the expansion joint holes 21 and 22 as projected on a sagittal plane are inclined at an angle of 45° to the transverse plane with the dorsal aspect of the holes being more anterior than the plantar aspect.
  • the distance from the releasable fastener 8 to the lateral expansion joint hole 22 is shorter than the distance from the releasable fastener to the medial expansion joint hole 21 such that the lateral portion of the prosthetic foot 1 has a shorter toe lever than the medial for enabling midfoot high and low dynamic response.
  • the distance from the releasable fastener 8 to the lateral plantar weight bearing surface as represented by T-i, line is shorter than the distance from the releasable fastener to the medial plantar surface weight bearing surface as represented by the line T 2 - such that the lateral portion of the prosthetic foot 1 has a shorter toe lever than the medial for enabling midfoot high low dynamic response.
  • the anterior of the hindfoot portion 4 of the foot keel 2 further includes an expansion joint hole 28 extending through the hindfoot portion 4 between dorsal and plantar surfaces thereof.
  • An expansion joint 29 extends posteriorly from the hole 28 to the posterior edge of the hindfoot portion to form expansion struts 30 and 31.
  • a dorsal aspect of the midfoot portion 5 and the forefoot portion 3 of the foot keel 2 form the upwardly facing concavity, 32 in Figure 3, so that it mimics in function the fifth ray axis of motion of a human foot. That is, the concavity 32 has a longitudinal axis C-C which is oriented at an angle ⁇ of 15° to 35° to the longitudinal axis A-A of the foot keel with the medial being more anterior than the lateral to encourage fifth ray motion in gait as in the oblique low gear axis of rotation of the second to fifth metatarsals in the human foot.
  • FIG. 6 Another foot keel 33 of the invention, especially for sprinting, may be used in the prosthetic foot of the invention, see Figures 6 and 7.
  • the body's center of gravity in a sprint becomes almost exclusively sagittal plane oriented.
  • the prosthetic foot does not need to have a low dynamic response characteristic.
  • the 15° to 35° external rotation orientation of the longitudinal axis of the forefoot, midfoot concavity as in foot keel 2 is not needed. Rather, the concavity's longitudinal axis D-D orientation should become parallel to the frontal plane as depicted in Figures 6 and 7. This makes the sprint foot respond in a sagittal direction only.
  • the orientation of the expansion joint holes 34 and 35 in the forefoot and midfoot portions, along line E-E, is parallel to the frontal plane, i.e., the lateral hole 35 is moved anteriorly and in line with the medial hole 34 and parallel to the frontal plane.
  • the anterior terminal end 36 of the foot keel 33 is also made parallel to the frontal plane.
  • the posterior terminal heel area 37 of the foot keel is also parallel to the frontal plane.
  • Another variation in the sprint foot keel 33 is in the toe, ray region of the forefoot portion of the foot where 15° of dorsiflexion in the foot keel 2 are increased to 25-40° of dorsiflexion in foot keel 33.
  • Figures 9 and 10 show an additional foot keel 38 of the invention for the prosthetic foot particularly useful for sprinting by an amputee that has had a Symes amputation of the foot.
  • the midfoot portion of the foot keel 38 includes a posterior, upwardly facing concavity 39 in which the curved lower end of the calf shank is attached to the foot keel by way of the releasable fastener.
  • This foot keel can be utilized by all lower extremity amputees.
  • the foot keel 38 accommodates the longer residual limb associated with the Symes level amputee. Its performance characteristics are distinctively quicker in dynamic response capabilities. Its use is not specific to this level of amputation.
  • the foot keel 40 in the example embodiment of Figures 11 and 12 also has a concavity 41 for a Symes amputee, the foot keel providing the prosthetic foot with high low dynamic response characteristic as well as biplanar motion capabilities like those of the example embodiment in Figures 3-5 and 8.
  • the functional characteristics of the several foot keels for the prosthetic foot 1 are associated with the shape and design features as they relate to concavities, convexities, radii size, expansion, compression, and material physical properties - all of these properties relating, to reacting to, ground forces in walking, running and jumping activities.
  • the foot keel 42 in Figure 13 is like that in the example embodiment of Figures 3-5 and 8, except that the thickness of the foot keel is tapered from the midfoot portion to the posterior of the hindfoot.
  • each design of the foot keel and calf shank create different functional outcomes, as these function outcomes relate to the horizontal and vertical linear velocities which are specific to improving performance in varied athletic related tasks.
  • the capability of multiple calf shank configurations and adjustments in settings between the foot keel and the calf shank create a prosthetic foot calf shank relationship that allows the amputee and/or the prosthetist the ability to tune the prosthetic foot for maximum performance in a selected one of a wide variety of walking and recreational activities.
  • calf shanks for the prosthetic foot 1 are illustrated in Figures 17- 22 and include C-shaped calf shanks 46 and 47, S-shaped calf shanks 48 and 49 and modified J-shaped calf shanks 50 and 51.
  • the upper end of the calf shank could also have a straight vertical end with a pyramid attachment plate attached to this proximal terminal end.
  • a male pyramid could be bolted to and through this vertical end of the calf shank.
  • Plastic or aluminum fillers to accept the proximal male pyramid and the distal foot keel could also be provided in the elongated openings at the proximal and distal ends of the calf shank.
  • the prosthetic foot of the invention is a modular system preferably constructed with standardized units or dimensions for flexibility and variety in use.
  • the left side of the right and left prosthetic foot calf shanks can be made thinner than the right side and the amputee runner's curve performance could be improved.
  • the foot keels 2, 33, 38, 42 and 43 in the several embodiments, are each 29 cm long with the proportions of the shoe 1 shown to scale in Figures 3, 4 and 5, and in the several views of the different calf shanks and foot keels.
  • the specific dimensions of the prosthetic foot can be varied depending on the size, weight and other characteristics of the amputee being fitted with the foot.
  • the human foot, ankle, shank and soft supporting tissues are loaded with kinetic energy during the stance phase of the gait and running cycle.
  • a prosthetic calf shank that is longer in length has more elastic energy storage capacity. As a consequence, more ankle joint kinetic power is utilized to do the work of walking, running and jumping. Therefore, the prosthetic calf shank can be attached to the most proximal regions of the amputee's residual limb socket; for example, to the tibia tubercle height.
  • the stance phase analysis of walking and running activities begins with the contact point being the posterior lateral corner 18, Figs. 5 and 8, which is offset more posteriorly and laterally than the medial side of the foot. This offset at initial contact causes the foot to evert and the calf shank to plantar flex.
  • the calf shank always seeks a position that transfers the body weight through its shank, e.g., it tends to have its long vertical member in a position to oppose the ground forces. This is why it moves posteriorly-plantar flexes to oppose the ground reaction force which is pushing posteriorly on the foot.
  • the ground forces cause calf shanks 6, 44, 45, 46, 47, 50 and 51 and those in the other embodiments to compress with the proximal end moving posterior.
  • calf shanks 48 and 49 if the distal concavity is compressed in response to the ground reaction forces the proximal concavity would expand and the entire calf shank unit would move posteriorly.
  • the initial loading ground forces cause the lower end of the calf shank to compress with the proximal end moving posteriorly.
  • the calf shank lower tight radius compresses simulating human ankle joint plantar flexion and the forefoot is lowered by compression to the ground.
  • the compressed members of the foot keel and calf shank then start to unload - that is they seek their original shape and the stored energy is released - which causes the calf shank proximal end to move anteriorly in an accelerated manner.
  • the ground forces change from pushing posteriorly to pushing vertically upward against the foot.
  • the prosthetic foot has posterior and anterior plantar surface weight bearing areas and these areas are connected by a non-weight bearing long arch shaped midportion, the vertically directed forces from the prosthesis cause the long arch shaped midportion to load by expansion.
  • the posterior and anterior weight-bearing surfaces diverge.
  • the calf shank anterior progression is arrested and the foot starts to pivot off the anterior plantar surface weight-bearing area.
  • the expansion of the midfoot portion of the foot keel has as high and low response capability in the case of the foot keels in the example embodiments of Figures 3-5 and 8, Figures 11 and 12, Figure 13 and Figure 14. Since the midfoot forefoot transitional area of these foot keels is deviated 15° to 35° externally from the long axis of the foot, the medial long arch is longer than the lateral long arch. This is important because in the normal foot, during acceleration or deceleration, the medial aspect of the foot is used.
  • the prosthetic foot longer medial arch has greater dynamic response characteristic than the lateral.
  • the lateral shorter toe lever is utilized when walking or running at slower speeds.
  • the body's center of gravity moves through space in a sinusoidal curve. It moves medial, lateral, proximal and distal. When walking or running at slower speeds, the body's center of gravity moves more medial and lateral than when walking or running fast.
  • momentum or inertia is less and the ability to overcome a higher dynamic response capability is less.
  • the prosthetic foot of the invention is adapted to accommodate these principles in applied mechanics.
  • the body's center of gravity is as far lateral as it will go. From midstance through toe off the body's center of gravity (BCG) moves from lateral to medial. As a consequence, the body's center of gravity progresses over the lateral side of the foot keel 2. First (low gear) and as the BCG progresses forward, it moves medially on foot keel 2 (high gear). As a consequence, the prosthetic foot keel 2 has an automatic transmission effect. That is to say, it starts in low gear and moves into high gear every step the amputee takes.
  • BCG body's center of gravity
  • the anterior portion of the long arch of the midfoot portion is contoured to apply these posteriorly directed forces perpendicular to its plantar surface. This is the most effective and efficient way to apply these forces.
  • the same can be said about the posterior hindfoot portion of the prosthetic foot. It is also shaped so that the posteriorly directed ground forces at initial contact are opposed with the foot keel's plantar surface being perpendicular to their applied force direction.
  • the ray region of the forefoot portion is dorsiflexed I5°-35 O .
  • One of the main propulsion mechanisms in human gait is called the active propulsion phase.
  • the body weight is now forward of the support limb and the center of gravity is falling.
  • line C-C there is a downward acceleration, which results in the highest vertical force received by the body.
  • Acceleration of the leg forward of the ankle associated with lifting of the heel, results in a posterior shear against the ground.
  • the center of pressure moves anterior to the metatarsal heads axis of rotation the effect is an ever-increasing dorsiflexion torque. This creates a full forward fall situation that generates the major progression force used in walking.
  • the signs of effective ankle function during the active propulsion are heel lift, minimal ankle joint motion, and a nearly neutral ankle position.
  • a stable midfoot is essential for normal sequencing in heel lift.
  • the posterior aspect of the hindfoot and the forefoot region of the foot keel incorporate expansion joint holes and expansion joint struts in several of the embodiments as noted previously.
  • the orientation of the expansion joint holes act as a mitered hinge and biplanar motion capabilities are improved for improving the total contact characteristics of the plantar surface of the foot when walking on uneven terrain.
  • the Symes foot keels in Figures 9-12 are distinctively different in dynamic response capabilities - as these capabilities are associated with walking, running and jumping activities. These foot keels differ in four distinct features. These include the presence of a concavity in the proximate, posterior of the midfoot portion for accommodating the Symes distal residual limb shape better than a flat surface. This concavity also lowers the height of the foot keel which accommodates the longer residual limb that is associated with the Symes level amputee.
  • the alignment concavity requires that the corresponding anterior and posterior radii of the arched foot keel midportion be more aggressive and smaller in size. As a consequence, all of the midfoot long arch radii and the hindfoot radii are tighter and smaller. This significantly affects the dynamic response characteristics. The smaller radii create less potential for a dynamic response.
  • the prosthetic foot responds quicker to all of the aforementioned walking, running and jumping ground forces. The result is a quicker foot with less dynamic response.
  • the human foot is a multi-functional unit - it walks, runs and jumps.
  • the human tibia fibula calf shank structure on the other hand is not a multi- functional unit. It is a simple lever which applies its forces in walking, running and jumping activities parallel to its long proximal-distal orientation. It is a non-compressible structure and it has no potential to store energy.
  • the prosthetic foot of the invention has dynamic response capabilities, as these dynamic response capabilities are associated with the horizontal and vertical linear velocity components of athletic walking, running and jumping activities and out-performing the human tibia and fibula.
  • the fastener 8 is loosened and the alignment of the calf shank and the foot keel with respect to one another is adjusted in the longitudinal direction of the foot keel.
  • Such a change is shown in connection with Figures 1 and 2.
  • the calf shank is then secured to the foot keel in the adjusted position with the fastener 8.
  • the bolt of the fastener 8 slides relative to one or both of the opposed, relatively longer, longitudinally extending openings 9 and 10 in the foot keel and calf shank, respectively.
  • An alignment change that improves the performance characteristic of a runner who makes initial contact with the ground with the foot flat as in a midfoot strike runner, for example, is one wherein the foot keel is slid anterior relative to the calf shank and the foot plantar flexed on the calf shank.
  • This new relationship improves the horizontal component of running. That is, with the calf shank plantar flexed to the foot, and the foot making contact with the ground in a foot flat position as opposed to initially heel contact, the ground immediately pushes posteriorly on the foot that is pushing anteriorly on the ground. This causes the calf shank to move rapidly forward (by expanding) and downwardly.
  • Dynamic response forces are created by expansion which resists the calf shank's direction of initial movement. As a consequence, the foot pivots over the metatarsal plantar surface weight-bearing area. This causes the midfoot region of the keel to expand which is resisted more than compression. The net effect of the calf shank expansion and the midfoot expansion is that further anterior progression of the calf shank is resisted which allows the knee extenders and hip extenders in the user's body to move the body's center of gravity forward and proximal in a more efficient manner (i.e., improved horizontal velocity).
  • the sprinters have increased range of motion, forces and momentum (inertia) - momentum being a prime mover. Since their stance phase deceleration phase is shorter than their acceleration phase, increased horizontal linear velocities are achieved. This means that at initial contact, when the toe touches the ground, the ground pushes posteriorly on the foot and the foot pushes anteriorly on the ground.
  • the calf shank which has increased forces and momentum is forced into even greater flexion and downward movement than the initial contact foot flat runner. As a consequence to these forces, the foot's long arch concavity is loaded by expansion and the calf shank is loaded by expansion. These expansion forces are resisted to a greater extent than all the other previously mentioned forces associated with running.
  • the dynamic response capability of the foot is proportional to the force applied.
  • the human tibia fibula calf shank response is only associated with the energy force potential - it is a straight structure and it cannot store energy.
  • These expansion forces in the prosthetic foot of the invention in sprinting are greater in magnitude than all the other previously mentioned forces associated with walking and running.
  • the dynamic response capability of the foot is proportional to the applied forces and increased amputee athletic performance, as compared with human body function, is possible.
  • the prosthetic foot 53 depicted in Fig. 25 is like that in Fig.
  • the foot keel 54 is adjustably connected to the calf shank 55 by way of plastic or metal alloy coupling element 56.
  • the coupling element is attached to the foot keel and calf shank by respective releasable fasteners 57 and 58 which are spaced from one another in the coupling element in a direction along the longitudinal direction of the foot keel.
  • the fastener 58 joining the coupling element to the calf shank is more posterior than the fastener 57 joining the foot keel and the coupling element.
  • the upper end of the calf shank 55 is formed with an elongated opening 59 for receiving a pylon 15. Once received in the opening, the pylon can be securely clamped to the calf shank by tightening bolts 60 and 61 to draw the free side edges 62 and 63 of the calf shank along the opening together.
  • This pylon connection can be readily adjusted by loosening the bolts, telescoping the pylon relative to the calf shank to the desired position and reclamping the pylon in the adjusted position by tightening the bolts.
  • the prosthetic foot 70 according to a further embodiment of the invention is depicted in Figs. 28-31 B.
  • the prosthetic foot 70 comprises a foot keel 71 , a calf shank 72 and a coupling element 73.
  • the prosthetic foot 70 is similar to the prosthetic foot 53 in the embodiment of Figs. 25-27, except that the calf shank 72 is formed with a downward, anteriorly facing convexly curved lower end 74 which is in the form of a spiral 75.
  • the calf shank extends upward anteriorly from the spiral to an upstanding upper end thereof as seen in Fig. 28.
  • the calf shank can be advantageously formed of metal, such as titanium, as noted above but other resilient materials could be used to form the semi-rigid, resilient calf shank.
  • the spiral shape at the lower end of the calf shank has a radius of curvature which progressively increases as the calf shank spirals outwardly from a radially inner end 76 thereof and as the calf shank extends upwardly from its lower, spiral end to its upper end, which may be curved in the longitudinal direction or straight. It has been found that this construction creates a prosthetic foot with an integrated ankle and calf shank with a variable radii response outcome similar to the parabola shaped calf shank of the invention, while at the same time allowing the coupling element 73 and the calf shank 72 to be more posterior on the foot keel 71.
  • the coupling element 73 is formed of plastic or metal alloy, and is adjustably fastened at its anterior end to the posterior of foot keel 71 by a threaded fastemer 78 as shown in Fig. 30.
  • the foot keel has a longitudinally extending opening 79 in an upwardly arched portion thereof which receives the fastener 78 to permit adjusting the alignment of the calf shank and foot keel with respect to one another in the longitudinal direction, e.g. along the line 30-30 in Fig. 29, in the manner explained above in connection with the other embodiments.
  • the posterior end of the coupling element includes a cross member 80 which is secured between two longitudinally extending plates 81 and 82 of the coupling element by metal screws 83 and 84 at each end of the cross member.
  • the radially inner end 76 of the spiral 75 is secured to the cross member 80 of the coupling element by a threaded fastener 85 as depicted in Fig. 30.
  • the calf shank spirals around the radially inner end 76 above the heel portion of the foot keel and extends upward anteriorly from the spiral through an opening 85 through the coupling element between plates 81 and 82 anterior of the cross member 80.
  • a cross member 86 in the anterior end of coupling element 73 is secured between plates 81 and 82 by fasteners 87 and 88 at each end as seen in Figs. 28 and 30.
  • the fastener 78 is received in a threaded opening in cross member 86.
  • the posterior surface of the cross member 86 supports a wedge 89 formed of plastic or rubber, for example, which is adhesively bonded at 90 to the cross member.
  • the wedge serves as a stop to limit dorsiflexion of the upwardly extending calf shank in gait.
  • the size of the wedge can be selected, wider at 89' in Fig. 31 A, or narrower at 89" in Fig. 31 B, to permit adjustment of the desired amount of dorsiflexion.
  • a plurality of the wedges could be used at once, one atop another and adhesively bonded to the coupling element for reducing the permitted dorsiflexion.
  • a prosthetic socket, not shown, attached to the amputee's lower leg stump can be connected to the upper end of the calf shank 72 via an adapter 92 secured to the upper end of the calf shank by fasteners 93 and 94 as shown in Fig. 28.
  • the adapter has an inverted pyramid-shaped attachment fitting 91 connected to an attachment plate attached to an upper surface of the adapter. The pyramid fitting is received by a complementarily shaped socket-type fitting on the depending prosthetic socket for joining the prosthetic foot and prosthetic socket.
  • the prosthetic foot 100 of the embodiment of the invention of Figs. 32- 34 comprises a longitudinally extending foot keel 101 having a forefoot portion
  • An upstanding calf shank 105 is secured to the foot keel at a lower end of the calf shank to form an ankle joint of the prosthetic foot and extends upward from the foot keel by way of an anterior facing convexly curved portion 106 of the calf shank.
  • the calf shank is secured to the foot keel by way of a coupling element 107 which is monolithically formed with the forefoot portion 102 of the foot keel.
  • the coupling element extends posteriorly from the forefoot portion as a cantilever over the midfoot portion 104 and part of the hindfoot portion 103.
  • the hindfoot portion and the midfoot portion of the foot keel are monolithically formed and connected to the monolithically formed forefoot portion and coupling element by fasteners 108 and 109.
  • the lower end of the calf shank 105 is reversely curved in the form of a spiral 110.
  • a radially inner end of the spiral 110 is fastened to the coupling element by a connector 111 in the form of a threaded bolt and nut extending through facing openings in the calf shank and the coupling element.
  • the coupling element posterior portion 112 is reversely curved to house the spiral lower end of the calf shank, which is supported at the upper end of the curved portion 112 by the connector 111.
  • a cosmetic covering anterior of the calf shank in the shape of a human foot and lower leg is optionally located over the foot keel 101 and at least he lower end of the calf shank 105 with the calf shank extending upwardly from the foot keel within the lower leg covering in the manner illustrated and described in connection with the embodiment of Fig. 28.
  • the prosthetic foot 100 of the embodiment of Figs. 32-34 has increased spring efficiency of the foot keel.
  • the ankle formed by the lower end of the calf shank in the prosthesis replicates human ankle joint function, the prosthesis helping to conserve forward momentum and inertia.
  • the configuration of the foot keel in the embodiment is not limited to that shown but could be any of the foot keel configurations shown previously including those having a high-low gear or a high gear only, having one or more expansion joints, or being formed with plural longitudinal sections, for example.
  • the calf shank of the embodiment could have its upper end, e.g. above the ankle and the anterior facing convexly curved portion extending upward from the foot keel, configured differently as for example with a configuration in any of the other embodiments disclosed herein.
  • the upper end of the calf shank can be connected to a socket on the lower limb of a person for use by means of an adapter, for example that in Fig. 3, Fig. 27 or Fig. 28, or other known adapter.
  • the prosthetic foot 100 in Figs. 32-34 further includes a posterior calf device 114 to store additional energy with anterior motion of the upper end of the calf shank in gait.
  • a flexible elongated member 116, preferably in the form of a strap, of the device 114 is connected to an upper portion of the calf shank by fasteners 119 and to a lower portion of the prosthetic foot, namely to coupling element 107 and lower end 110 of the shank by connector 111 as discussed above.
  • the length of the flexible strap which can be elastic and/or non-elastic, is tensioned in gait and can be fixed in length or adjusted by use of a slide adjustment 117 between overlapping lengths of the strap.
  • a curvilinear spring 118 is adjustably supported at its base on the upper end of the calf shank, for example between the calf shank and an adapter, not shown, secured to the calf shank, with fasteners 119.
  • the lower, free end of the spring is positioned to interact with the flexible strap. When the strap is tensioned the spring changes the direction of the longitudinal extent of the strap.
  • the strap tension serves to assist posterior movement of the upper end of the resilient shank as well as control anterior movement of the calf shank during use of the prosthesis. Assisting the posterior movement can be helpful in attaining a rapid foot flat response of the prosthetic foot at heel strike in the initial stance phase of gait akin to that which occurs in a human foot and ankle in gait at heel strike where plantarflexion of the foot occurs.
  • the assisting posterior movement and the controlling anterior movement of the upper end of the resilient calf shank during use of the prosthesis using the posterior calf device 114 are each effective to change the ankle torque ratio of the prosthetic foot in gait by affecting a change in the sagittal plane flexure characteristic for longitudinal movement of the upper end of the calf shank in response to force loading and unloading during a person's use of the prosthetic foot.
  • the natural physiologic ankle torque ratio in the human foot in gait defined as the quotient of the peak dorsiflexion ankle torque that occurs in the late terminal stance of gait divided by the plantar flexion ankle torque created in the initial foot flat loading response after heel strike in gait has been reported as 11.33 to 1.
  • An aim of changing the sagittal plane flexure characteristic for longitudinal movement of the upper end of the calf shank using the posterior calf device 114 is to increase the ankle torque ratio of the prosthesis to mimic that which occurs in the human foot in gait. This is important for achieving proper gait with the prosthesis and, for a person with one natural foot and one prosthetic foot, for achieving symmetry in gait.
  • the ankle torque ratio of the prosthesis is increased so that the peak dorsiflexion ankle torque which occurs in the prosthesis is an order of magnitude greater than the plantar flexion ankle torque therein. More preferably, the ankle torque ratio is increased to a value of about 11 to 1 , to compare with the reported natural ankle torque ratio of 11.33 to 1.
  • a further purpose of the posterior calf device is to improve the efficiency of the prosthetic foot in gait by storing additional elastic energy in the spring 118 of the device during force loading of the prosthesis and to return the stored elastic energy during force unloading to increase the kinetic power generated for propulsive force by the prosthetic foot in gait.
  • the device 114 may be considered to serve the purpose in the prosthetic foot that the human calf musculature serves in the human foot, ankle and calf in gait, namely efficiently generating propulsive force on the person's body in gait utilizing the development of potential energy in the body during force loading of the foot and the conversion of that potential energy into kinetic energy for propulsive force during force unloading of the foot.
  • the control of anterior movement of the upper end of the calf shank 105 by the posterior calf device 114 is effective to limit the range of anterior movement of the upper end of the calf shank.
  • the foot keel in the prosthetic foot 100 by the expansion of its resilient longitudinal arch in the coupling element 107 and the compression of reversely curved portion 112 of the coupling element also contributes to storing energy during force loading in gait as discussed above. This potential energy is returned as kinetic power for generating propulsive during force unloading in gait.
  • the prosthesis 120 in Fig. 35 comprises a foot keel 121 , a calf shank 122 and a posterior calf device 123.
  • An adapter 124 is connected by suitable fasteners, not shown, to the upper end of the calf shank for securing the prosthesis to a socket on the lower limb of a person for use.
  • a coupling element 125 of the prosthesis is monolithically formed with a forefoot portion 126 of the foot keel.
  • a hindfoot portion 127 of the foot keel is joined to the upper end of the reversely curved portion of the coupling element by a fastener arrangement 128, shown disassembled in Fig.
  • the fastener arrangement includes a radially inner component 129 against the radially inner end of the reversely curved spiral of the lower end of the calf shank, and a radially outer component 130 against the upper end of the hindfoot portion 127.
  • a mechanical fastener not shown, such as a through bolt and nut, extends through aligned openings in the components
  • the posterior calf device 123 on the prosthetic foot 120 includes a coiled spring 131 supported at its one end at the upper end of the calf shank for movement therewith.
  • a second, free end of the coiled spring has one end of a flexible elongated member, strap 132, secured thereto by a metal clip 133.
  • the clip is connected at its one end to a first end of the strap and at its other end is hooked over in clamping engagement with the free end of the coiled spring as depicted in Fig. 35.
  • An intermediate portion of the flexible strap 132 extends down to the foot keel and lower end of the calf shank where it extends about a return 134 in the form of a cylindrical pin 135 mounted on the component 130 of the fastener arrangement 128.
  • the pin 134 may be rotatably mounted in the component 130.
  • the second end of the strap is clampingly retained at the upper end of the calf shank between the posterior surface of the shank and a complementarity shaped spring retainer member 135 which extends part way down the length of the shank.
  • the upper end of the member 135 is secured between the upper end of the coiled spring and the upper end of the shank by suitable fasteners, not shown.
  • the length of the flexible strap which can be elastic and/or non-elastic, is tensioned in gait. This length is fixed, or it can be adjusted by use of a slide adjustment, not shown, between overlapping lengths of the strap adjacent the connection to the metal clip 133, for example.
  • the coiled spring 131 is formed of spring steel in the embodiment but other metal alloys or non-metals such as plastic could be employed.
  • the spring retainer member 135 is formed of carbon fiber encapsulated in epoxy resin in the embodiment but other materials, including a metal alloy, and plastic could be used.
  • the flexible strap 132 like the strap 116 in Figs. 32-34, is made of a woven Kevlar (DuPont) material having a width of 5/8 inch and a thickness of 1/16 inch but other materials and dimensions could be employed as will be apparent to the skilled artisan.
  • the first end of the strap 132 extends through an opening in the end of the metal clip 133 and is doubled back on the strap where it is adjustably retained by a slide adjustment or other fastener.
  • the prosthesis 140 in the embodiment of Fig. 36 employs the calf shank 122 and posterior calf device 123 used with the prosthesis 120 of Fig. 35.
  • the foot keel 141 of the prosthetic foot 140 includes a reversely curved coupling element 142 connected to the lower end of the calf shank by fastener arrangement 128 for housing and supporting the spiral lower end of the calf shank.
  • the coupling element is monolithically formed with both the forefoot portion 143 and the hindfoot portion 144 of the foot keel.
  • the prosthetic foot 150 of the embodiment of Fig. 37 is like that in Figs. 35 and 36 except that the coupling element 151 is formed as a separate element which is secured at its posterior end by a fastener 153 to the foot keel 152 forming the forefoot, midfoot and hindfoot portions 155, 156 and 157 of the foot keel.
  • the area of the connection at fastener 153 is posterior the connection of the calf shank and the coupling element for increasing the active length of the foot keel and its spring rate in the late mid-stance phase of gait. This effect is still greater in the embodiment of Fig.
  • the fastener can be a mechanical fastener such as a bolt and nut or other fastener including a composite of wrapped carbon fiber and epoxy resin or a composite of a wrapped aromatic polyamide fiber such as Kevlar by DuPont and epoxy resin.
  • the lower anterior end 165 of the coupling element is extended to serve as a stop for the anterior movement of the calf shank in dorsiflexion.
  • a separate stop as provided at 113 in the embodiment of Figs. 32-34 could be provided. Either type of stop could also be used in the embodiments of Figs. 35 and 36.
  • the prosthetic foot 170 in Fig. 40 is similar to the prosthetic foot in the embodiment of Figs. 28-31 B.
  • the prosthesis 170 includes a foot keel 171 , a calf shank 172 and a coupling element 173.
  • the shank 172 is formed with a downward, anterior facing convexly curved lower end 174 which is reversely curved in the form of a spiral 175.
  • the calf shank extends upward from the spiral to an upstanding upper end thereof, which may be curved in the longitudinal direction or straight.
  • the spiral shape at the lower end of the calf shank has a radius of curvature which progressively increases as the calf shank spirals outwardly from a radially inner, upper end 176 where it is fastened to the coupling element by a connector, not shown, in the form of a threaded bolt and nut extending through facing openings in the calf shank and coupling element as in the embodiments of Figs. 32-38.
  • the coupling element 173 serves as a housing for the spiral 175 and is adjustably fastened to the foot keel 171 by a threaded fastener as in Fig. 30.
  • the foot keel has a longitudinally extending opening in an upwardly arched portion thereof which receives the fastener to permit adjusting the alignment of the calf shank and foot keel with respect to one another in the longitudinal direction as explained in connection with the other embodiments.
  • the coupling element 173 is formed with open sides and an anterior facing opening bounded laterally by laterally spaced, anterior side edges 177 of the coupling element.
  • the calf shank extends upwardly through the anterior facing opening as in the embodiment of Figs. 28-30.
  • a stop can be provided as in Figs. 28-30 to limit dorsiflexion of the calf shank in gait.
  • An adapter 124 like that in the embodiments of Figs. 35-39 is connected by suitable fasteners, not shown, to the upper end of the calf shank for securing the prosthesis to a socket on the lower limb of a person for use.
  • a posterior calf device 178 on the prosthetic foot 170 is like device 123 in Fig. 35 and includes a coiled spring 179 supported at its one end at the upper end of the calf shank for movement therewith.
  • a second, free end of the coiled spring has one end of a flexible elongated member, strap 180, secured thereto by a metal clip 181.
  • the clip is connected at its one end to a first end of the strap and at its other end is hooked over in clamping engagement with the free end of the coiled spring as in the posterior calf device in Fig. 35.
  • An intermediate portion of the flexible strap 180 extends down to the foot keel and lower end of the calf shank where it extends about a return 182 in the form of a cylindrical pin mounted on component 183 of the fastener arrangement 184 joining the coupling element and lower end of the calf shank.
  • the pin 182 may be rotatably mounted in the component 183 to minimize sliding resistance.
  • the second end of the strap is clampingly retained at the upper end of the calf shank between the shank and the coiled spring.
  • the flexible strap can be fixed in length or adjustable in length by use of a slide adjustment, not shown, as in the embodiment of Fig. 35.
  • the device 178 serves to store energy during force of the prosthesis in the late mid- stance phase of gait, which stored energy is released during force unloading thereby contributing to sagittal plane ankle power generation as discussed with respect to the embodiment of Fig. 35.
  • the ankle of the prosthesis 170 is higher above the ground than the ankle in prosthesis 70.
  • the lower end of the reversely curved, spiral ankle joint 174 in Fig. 40 is above the upwardly arched midportion of the foot keel 171 in Fig. 40 because of the upwardly and posteriorly extending configuration of the coupling element 173 whereas the lower end 75 of the spiral 74 in prosthesis 70 of Figs. 28-30 is lower than the height of the upwardly arched midportion of the foot keel.
  • the height of this ankle area above the ground affects the ankle's sagittal plane angular change which occurs in the stance phase of gait. A higher placement of the ankle area will increase the angular change while a lower placement of the ankle will decrease the angular change.
  • the higher placement of the ankle as in Fig. 40 has greater angular velocity potential for the same amount of angular change that occurs at the proximal end of the shank.
  • This increase in angular velocity is quite significant; for example, an ankle height of two inches has 35% less angular change than an ankle height of three and one-half inches.
  • the ankle height in the prosthesis of the invention is determined by a number of factors including the size and configuration of the coupling element, the longitudinal arch height, the length of the forefoot, midfoot and hindfoot portions of the foot keel, etc. as will be apparent to the skilled artisan.
  • the prosthetic foot 190 of the embodiment of Figures 41-44 is similar to the prosthetic foot in Figure 40 except for its posterior calf device 191.
  • the prosthesis 190 includes a foot keel 192, a calf shank 193 and a coupling element 194.
  • the shank is formed with a downward, anterior facing convexly curved lower end 195 which is reversely curved in the form of a spiral 196.
  • the calf shank extends upward from the spiral to an upstanding upper end thereof, which may be curved in the longitudinal direction or straight.
  • the spiral shape at the lower end of the calf shank has a radius of curvature which progressively increases as the calf shank spirals outwardly from a radially inner, upper end 197 where it is fastened to the coupling element by a connector 198, Fig. 43, in the form of a threaded bolt and nut with washer extending through facing openings in the calf shank and coupling element.
  • the bolt of the connector passes through an aperture of a backing plate 199, an elongated aperture 200 in the coupling element and an aperture in the radially inner, upper end 197 of the shank where it is received in a threaded opening of a nut plate 201 , Figure 41.
  • the coupling element 194 serves as a housing for the spiral 196 and is adjustably fastened to the foot keel by a threaded fastener 220 as described previously, except that an elongated aperture at the connection is provided in the coupling element instead of the foot keel to permit adjusting the alignment of the calf shank and foot keel with respect to one another in the longitudinal direction as explained in connection with the other embodiments.
  • the coupling element 194 is formed with open sides and an anterior facing opening bounded laterally by laterally spaced, anterior side edges 202 of the coupling element.
  • the calf shank extends upwardly through the anterior facing opening as in the embodiment of Figures 28-30.
  • a stop can be provided as in Figures 28-30 to limit dorsiflexion of the calf shank in gait.
  • the posterior calf device 191 acts as a stop to preclude further anterior, longitudinal motion of the upper end of the shank when a force loading on the shank is greater than that in a normal gait cycle.
  • the posterior calf device 191 on the prosthetic foot 190 includes an elongated member in the form of a metal cable 204 of stainless steel or other alloy having a diameter of, for example V 8 " to 3 /i 6 ", connected with play and extending between the upper end of the calf shank and a lower portion of the prosthetic foot.
  • the length of the cable is such that force loading on the calf shank encountered in a normal gait cycle does not tension the cable with the longitudinal movement of the upper end of the calf shank anteriorly in dorsiflexion or posteriorly in plantarflexion.
  • a force loading on the calf shank during use e.g. from a loading or push off force
  • the cable length is such in relation to the anterior, longitudinal movement of the upper end of the shank relative to the foot keel that the cable is tensioned to limit, e.g. stop, further anterior, longitudinal motion of the upper end of the calf shank to avoid increased stressing of the calf shank.
  • the upper and lower ends of the cable 204 are each provided with a connector 205, in the form of a swaged metal sleeve on the cable, for example.
  • the connector at the lower end is schematically depicted in Figure 44.
  • These connectors function to retain the cable ends in their respective blocks when the cable is tensioned.
  • An upper metal block 206 formed of a metal such as aluminum, titanium or stainless steel, is fastened to the upper end of the calf shank by socket head counter screws 207 which extend through apertures in the calf shank and block 206 into threaded holes in a metal tongue 208 as shown in Fig. 44.
  • the upper end of the block 206 has a recess 209 for the connector 205 at the upper end of the cable and a groove 210 extending downwardly from the recess along the posterior surface of the block for receiving and guiding the metal cable 204.
  • the tongue 208 overlays the cable and block when secured by the screws 207 against the block.
  • the diameter of the connector 205 is larger than the diameter of the groove 210 in order to retain the upper end of the cable in the recess 209 when the cable is tensioned.
  • the d-shaped block 206 is shown hollowed at 211 to reduce weight.
  • the lower end of the cable 204 extends through an aperture 212 in a lower metal block 213, formed of a metal such as aluminum, titanium or stainless steel, where it is secured by connector 205 thereon.
  • a resilient bumper 221 formed of rubber or synthetic rubber such as polyurethane, for example, in the form of a washer %" to 3 Ai 6 " thick, for example, is located about the cable between the connector 205
  • the resilient bumper absorbs shock when the cable is tensioned during use and it also serves to store energy and return the same for improving efficiency of the prosthesis as discussed above.
  • the block 213 is pivotably connected to the end of the backing plate 199 by a stainless steel dowel pin
  • connection of the posterior calf device 191 to the prosthesis is followed by enclosure of the upper end of the assembly in an aluminum, titanium or stainless steel socket head 215.
  • the socket head has internal grooves that accept the tongue 208, block 206 and shank 193.
  • the socket head is secured to the assembly with three set screws 216, two on the anterior side and one on the posterior side as depicted in Figure 43.
  • a further socket head 217 of the adapter 204 is then telescoped over the socket head 215 and retained thereon by tightening socket head cap screw 218 in the apertures of a band clamp about the lower end of the socket head 217.
  • the upper end of the socket head 217 is provided with two pairs of set screws 219 which respectively allow longitudinal angular change and medial-lateral angular change of a structure received by the socket head. This allows transverse plane motion and tow in - tow out adjustment of the prosthesis with respect to the structure on the leg stump of the user.
  • the lower end of the calf shank in the prosthetic foot of the invention is not limited to a parabola shape or a spiral shape but can be hyperbolic or otherwise downward convexly, curvilinearly configured to produce the desired motion outcomes of the foot when connected to the foot keel to form the ankle joint area of the foot.
  • the configuration of a spring in the device could be different than those shown.
  • a resilient tube of metal or plastic extending transversely to the longitudinal extent of the prosthesis could be interposed between the elongated member and the upper portion of the shank for storing and releasing energy.
  • the features of the various embodiments including the materials for construction could also be used with one another. More particularly, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings, and the appended claims without departing from the spirit of the invention. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.

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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 (190) comprenant un pied artificiel (192) et une tige élastique (193), son extrémité inférieure étant reliée au pied artificiel afin de former l’articulation de la cheville de la prothèse. La tige s’étend vers le haut depuis le pied artificiel à l’aide d’une partie incurvée de façon convexe tournée vers l’avant (195) de la tige, et est fixée au pied artificiel par un élément d’assemblage (194). La partie inférieure de la tige est incurvée de façon inverse (196) et logée dans une partie incurvée de façon inverse de l’élément d’assemblage. Un dispositif postérieur de mollet (191) possède un câble (204) qui n’est pas tendu lors d’un cycle de marche normal mais qui est tendu par une force s’exerçant sur la prothèse supérieure à 120% du poids du corps de l’utilisateur afin de limiter, voire de stopper, tout mouvement supplémentaire vers l’avant de la partie supérieure de la tige.
PCT/US2005/034037 2005-04-01 2005-09-26 Prothese de pied a performances reglables WO2006107329A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
PCT/US2005/011291 WO2005097009A1 (fr) 2002-03-29 2005-04-01 Pied prothetique a performances adaptables
PCT/US2005/011304 WO2005097011A1 (fr) 2002-03-29 2005-04-01 Prothese de pied reglable pour une plus grande efficacite
USPCT/US2005/011291 2005-04-01
USPCT/US2005/011304 2005-04-01

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WO2006107329A1 true WO2006107329A1 (fr) 2006-10-12

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8620224B2 (en) 2009-12-28 2013-12-31 Fujitsu Limited Communication method and communication apparatus
CN115339543A (zh) * 2022-09-21 2022-11-15 吉林大学 一种适用于斜坡地面具有缓冲节能稳定功能的仿生机械腿

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4555817A (en) * 1983-07-18 1985-12-03 Mckendrick Roderick W Prosthetic foot and ankle joint
US5312669A (en) * 1992-01-03 1994-05-17 Becker Orthopedic Appliance Company Thermoplastic composite reinforcement and method for orthotic, prosthetic and other devices
US5695526A (en) * 1993-10-12 1997-12-09 Wilson Michael T One-piece mechanically differentiated prosthetic foot and associated ankle joint with syme modification
US6602295B1 (en) * 1999-05-24 2003-08-05 Ohio Willow Wood Company Prosthetic foot having shock absorption
US20030191540A1 (en) * 2001-03-30 2003-10-09 Townsend Barry W. Prosthetic foot with tunable performance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4555817A (en) * 1983-07-18 1985-12-03 Mckendrick Roderick W Prosthetic foot and ankle joint
US5312669A (en) * 1992-01-03 1994-05-17 Becker Orthopedic Appliance Company Thermoplastic composite reinforcement and method for orthotic, prosthetic and other devices
US5695526A (en) * 1993-10-12 1997-12-09 Wilson Michael T One-piece mechanically differentiated prosthetic foot and associated ankle joint with syme modification
US6602295B1 (en) * 1999-05-24 2003-08-05 Ohio Willow Wood Company Prosthetic foot having shock absorption
US20030191540A1 (en) * 2001-03-30 2003-10-09 Townsend Barry W. Prosthetic foot with tunable performance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8620224B2 (en) 2009-12-28 2013-12-31 Fujitsu Limited Communication method and communication apparatus
CN115339543A (zh) * 2022-09-21 2022-11-15 吉林大学 一种适用于斜坡地面具有缓冲节能稳定功能的仿生机械腿
CN115339543B (zh) * 2022-09-21 2023-06-20 吉林大学 一种适用于斜坡地面具有缓冲节能稳定功能的仿生机械腿

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