SU560606A1 - Artificial foot - Google Patents

Artificial foot

Info

Publication number
SU560606A1
SU560606A1 SU2154519A SU2154519A SU560606A1 SU 560606 A1 SU560606 A1 SU 560606A1 SU 2154519 A SU2154519 A SU 2154519A SU 2154519 A SU2154519 A SU 2154519A SU 560606 A1 SU560606 A1 SU 560606A1
Authority
SU
USSR - Soviet Union
Prior art keywords
foot
prosthesis
grooves
plantar
plate
Prior art date
Application number
SU2154519A
Other languages
Russian (ru)
Inventor
Алексей Константинович Покатилов
Original Assignee
Центральный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Протезирования И Протезостроения
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Центральный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Протезирования И Протезостроения filed Critical Центральный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Протезирования И Протезостроения
Priority to SU2154519A priority Critical patent/SU560606A1/en
Application granted granted Critical
Publication of SU560606A1 publication Critical patent/SU560606A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/68Operating or control means
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5001Cosmetic coverings
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5007Prostheses not implantable in the body having elastic means different from springs, e.g. including an elastomeric insert
    • A61F2002/5009Prostheses not implantable in the body having elastic means different from springs, e.g. including an elastomeric insert having two or more elastomeric blocks
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5016Prostheses not implantable in the body adjustable
    • A61F2002/503Prostheses not implantable in the body adjustable for adjusting elasticity, flexibility, spring rate or mechanical tension
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • A61F2002/6614Feet
    • A61F2002/6657Feet having a plate-like or strip-like spring element, e.g. an energy-storing cantilever spring keel

Landscapes

  • Health & Medical Sciences (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (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)

Description

Изобретентш относитс  к области протезировани  и иротезостроенуш, а . к протезам нижних конечностей. Извеютна искусственна  стопа, содержаща  подошвешгую пластину с покрытием из эластичного материала, игйколоткуг амО15ти заторы и элементы креплени . Однако извес на  искусственна  стопа при подгонке не имеет возможности регулировки в грех плоскост х и, кроме того, ограничено протезирование инвалидов с длинной ку/штей голени (укорочение до 1,5 см-)Цепью изобретени   в7шетс  устразСпю Бышеуказазщых недостатков. Поставленна  цель достигаетс  тем, что в стопе установлена дополнителыиш пласти на, соединенна  с подошвенной с помо1;1.ью амортизаторов. Причем дополлительна  плас тина имеет продольные пазы и выемку, а подошвенна  - пазы в поперечном направлении . На фиг. 1 иизображена искусственна  стопа , в общем виде; на фиг. 2 - то же, вид сверху; на фиг. 3 - нижзш  пластина стопы j;a фш, 4 ве|)хл   п.гтастила CTOin ij на фш о Екладыи: дл  длинной кулы.и; по 11ирог-ову, Пскусстве}Ц1 ш стопа содор;н-;ит подошвенiiyjo nnacTHJr. 1 с двум  nojijOp.ajiijiriaNQi, );юпoг oжeJПIЬi aI во фропталыюй плоскости, паo , 2, лопол,читслыг Ю пласти}гз- 3, i;:yio по fiasNtepy, с четырьм  п 1ОДО;1ЬН1 1 П naoaNGi 4, )ас1ю;южо;цп-1кт в сагиттсшыю) плоскости, н выемкой 5 в середи1е дл  Kfieii- лезпш щиколотки G или вкладыкит дл  длич- ной культи по Нирогову. Пластины 1 и 3 соодинеш11 юхсду собой четырь 1Я бо.чгами 7 с амортизаторами 8. Болты 7 пластины 1 закреплены корО}1чатыми гайками 9 ЧО1)(3 эластич1Г.Ю шайбу 10. I одО1:;велна  пл;:1Стина 1 спеооди заг)ута Kiu-nxy и имеет гибкие пластинки 11, выпол); )Ч.;И(. ()оль плкхгне-фалшггового соч.ло)1епн , а .тиз IUHIC- тшш 1 покрыт эластичным матори.ъюмстолькой 12с , па)аллольиыми iia- зам пластины 1, н KOTOpi)ix скрыты корончатые гайки 9. Регулировку ocyuiecTB.i.qjiT следующим образом.The invention relates to the field of prosthetics and irotozostroenush, as well. for lower limb prostheses. An artificial leg of foot, containing a sole plate with a coating of elastic material, arms and congestion and fasteners. However, the weights on the artificial foot during adjustment do not have the possibility of adjustment in sin planes and, in addition, prosthetics of persons with long cu / calf shank (shortening to 1.5 cm-) is limited. The chain of the invention resists inadaptive shortcomings. The goal is achieved by the addition of a plate in the foot, which is connected to the plantar by means of 1; 1. shock absorbers. Moreover, the additional plate has longitudinal grooves and a notch, and the bottom plate has grooves in the transverse direction. FIG. 1 depicts an artificial foot, in general; in fig. 2 - the same, top view; in fig. 3 - the bottom plate of the foot j; a fsh, 4 ve |) chl pgtastyla CTOin ij on fsh o Ekladyi: for long kulu.i; 11irog-ov, Pskusstve} Ts1 w foot sodor; n-; u it soleos nijacTHJr. 1 with two nojijOp.ajiijiriaNQi,); juridical artillery in the plane of the plane, pao, 2, lopol, chitslig upl} gz- 3, i;: yio fiasNtepy, with four n 1ODO; ; southerly; cp-1ct in the sagittal plane, with a notch 5 in the middle for Kfieii-ankle of the ankle G, or an insertion of a kipper for a different stump according to Nirogov. Plates 1 and 3 are combined with four 4 I of bows 7 with shock absorbers 8. Bolts 7 of plate 1 are fixed with corO} with 1 nut 9 FF1) (3 elastic 1G washer 10. I odO1:; well vel;: 1 Steen 1 speed zag) Uta Kiu-nxy and has flexible plates 11, done); ) H; AND (. () Ol PLKHGNE-FALSHGOVOJA SYO.LO) 1пн, and .tiz IUHIC- tshsh 1 is covered with an elastic mator. The adjustment of ocyuiecTB.i.qjiT is as follows.

Шикопотк 6 или вкладьки дл  длшшой гсупьти по IhiporoBy обьпетым способом ввх.регш ют к гипьзе гопсш протеза, Заг ги« BajoT корончатые гайки 9, распопоже1тые на подошвенной стороне стопы. В процессе примерки ипи пробной носки протеза при не обходимости коррекции посгроени  прогеэа корончатые гайки расспабп ют, поспе чего допопиигепысую пластину 3 вместе с укрепленной на шикопотке 6 гильзой голени про- теза воомоулно сместить вперед- назадj на ружу ипи внутрь, увеличить или уменьшить разворот всего узпа Эти движени  легко осуществить бпагодара наличию на пласти- нах взаиЪ1ЛО пер1 ендИ1суп рно расположен- ных паоов 2 и 4, Дополнительна  пластина 3 имеет меньший размер, чем. подошвенна  пластина 1, и при перемещении ее на 2 см от среднего положени j она не выходит за кра  ппаст П ы 1, что важно дл  собдюдениа косметню, размера и формы стопьи При попе проксимальной части протеза во фронтальной плоскости более JUIOTHO зат гивают две корончатые гай1Ш 9, расположеш1ые в сшиттапьной плоскости. При изменении нвli пона гильзы голени в сагиттапьной плоскост зат гивают корончатые гайки 9, расположен ные во фронтальной ппоскости. После отыскани  оптш 1альной сХемы построени  протеза корончатые Гайки 9 боптов 7 зат гива-ют и шплинтуют, р Внесение нодобных коррекдий занимлет две -три минзть и не требует распила и последующей сварки протеза в новом положенииоChic 6 or inlays for the longest one, according to IhiporoBy, use the hypoxia of the prosthesis, the BojoT crown nuts 9, located on the plantar side of the foot. In the process of fitting a test prosthesis, if necessary, correction of the crown nuts will be disassembled, and the top plate 3, together with the 6 sleeve of the prosthesis fixed on the tubing, should be shifted forward and backward along the rifle to extend the pattern. These movements are easy to carry out with the presence of the following on the plates: 11 perIndInd11 spherically located pao 2 and 4, the additional plate 3 is smaller than. plantar plate 1, and when moving it 2 cm from the middle position j, it does not extend beyond the edge of the patch 1, which is important for the makeup, size and shape of the foot. 9, located in a stacked plane. When the liner sleeve is changed, the crown nuts 9 located in the frontal plane tighten in the sagitta plane. After finding the optic of the first prosthesis building, the crown nuts 9 bopt 7 are tightened and pinned, p. Making such corrections takes two or three minutes and does not require cutting and subsequent welding of the prosthesis in a new position.

При . ходьбе иск сствен1иш стопа рабо. тает следующим, образом..At. walking lawsuit resch1ish foot rabo. melts in the following way ..

При опоре па п тк, искусственной стоны проьшнаетс  стелька 12 sia п тке и задние нижние и перед1Гие верхние амортизаторы 8„ По мере нагружешш передзшго отдела стонь срабатывают передние ннжпне и задние амортизаторы 8, Затем нагрузка перехо дит на плюсне -фадшповое со-иепение, где имеютс  гибкие пластинки 11 ПосколькуWhen supporting an artificial moan, the insole 12 sia and the lower lower and front upper shock absorbers 8 “will be removed.” “As the front division is loaded, the front dampers and the rear dampers 8 are activated, then the load passes on the plusline - front co-saw, there are flexible plates 11 Because

дополнительна  ппасткна 3 закреплена между верхними и нижними амортизаторами, то щиколотка стопы вместе с гильзой годенн при ходьбе имеет зарессоренную боковую и роташюшгую подвижность. Величину накпо )1ов гильзы гопени регулируют силой зат гивани  корончатых гаек 9 или путем подкладывшш  под амортизаторы допопнитепь- ной эла:тичной шайбы.Additional ppastkna 3 is fixed between the upper and lower shock absorbers, then the ankle of the foot, along with the sleeve, is suitable for walking when it has a spring-loaded side and rotary mobility. The size of the hopper liner is regulated by the force of tightening of the crown nuts 9 or by placing it under the shock absorbers of an extra flat elbow.

После выбора индивидуальной схемы потроени  протеза его отдают в отделку дл  обклейки известным способом стопы породе- ном и придани  ей косметики . Измен   линейное или угловое положение дистальной части протеза, можно подобрать оптимальную схему посароени  протеза, не прибега  к ргюпилу гильзы голени или гильзы бедра. Кроме того, измен   жесткость передних или зад}шх амортизаторов, вынос  шиколотку вперед или назад, всегда можно установить биомеханически выгодную подвижность стопьиAfter choosing an individual pattern of prostration, the prosthesis is given to the finish for pasting the foot of a breed in a known manner, and to impart cosmetics to it. By changing the linear or angular position of the distal part of the prosthesis, it is possible to choose the optimal scheme for cutting the prosthesis without resorting to the rump of the shin sleeve or thigh sleeve. In addition, by changing the stiffness of the front or rear axle shock absorbers, taking the paddle forward or backward, you can always set the biomechanically beneficial mobility of the foot.

Claims (1)

Формула изобретени Invention Formula Пскусственна  стопа, содержаща  подошвенную пластину с покрытием из эластичного материала, щиколотку, амортизаторы и элементы креплени , о т л и ч а ю- щ а   с   тем, что, с цепью обеспечени  возможности регулировки положени  стоны в трех плоскост х при подгонке протеза, а также протезировшто  инвалидов с длинной культей голени (укорочение до 1,5 см), в стопе установлена дополнительна  пластипа . Имеюща  продольные пазы и выемку, и соединенна  с подошвенной с помощью ам.ортизаторов, а подошвенна  пластина имеет пазы в поперечном направлении.An initial foot, containing a sole plate with a coating of elastic material, ankle, shock absorbers and fasteners, is so tied that, with a chain of ensuring the possibility of adjusting the position of the grooves in three planes when fitting the prosthesis, and also prosthetics of persons with disabilities with a long stump of the leg (shortening to 1.5 cm), an additional plastip was installed in the foot. It has longitudinal grooves and a notch, and is connected to the plantar with amortizers, and the plantar plate has grooves in the transverse direction. Источники информации, прин тые во внимание при экспертизе:Sources of information taken into account in the examination: 1 Авторское свидетельство №351542, А 61 F 1/08, 1972. 1 Copyright certificate №351542, A 61 F 1/08, 1972. .2.2 иг.Зig.Z иг. 4ig. four
SU2154519A 1975-07-18 1975-07-18 Artificial foot SU560606A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU2154519A SU560606A1 (en) 1975-07-18 1975-07-18 Artificial foot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU2154519A SU560606A1 (en) 1975-07-18 1975-07-18 Artificial foot

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SU560606A1 true SU560606A1 (en) 1977-06-05

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5944760A (en) * 1997-08-04 1999-08-31 Roland J. Christensen Family Limited Partnership Prosthetic foot with reinforcing member
US6241776B1 (en) 1997-08-04 2001-06-05 Roland Christensen Prosthetic foot with reinforcing member
US6527811B1 (en) * 1989-04-13 2003-03-04 Van L. Phillips Foot prosthesis with modular foot plate
US6805717B2 (en) 2002-10-08 2004-10-19 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Manager Of The Roland J. Christensen Family Limited Partnership Energy-storing prosthetic foot with elongated forefoot
US6899737B1 (en) 1998-04-10 2005-05-31 Van L. Phillips Foot prosthesis having cushioned ankle
US6911052B2 (en) 2002-10-08 2005-06-28 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with oblique attachment
US6929665B2 (en) 2002-10-08 2005-08-16 Roland J. Christensen Prosthetic foot with a resilient ankle
US7063727B2 (en) 2000-10-26 2006-06-20 Van L. Phillips Foot prosthesis having cushioned ankle
US7686848B2 (en) 2000-06-30 2010-03-30 Freedom Innovations, Llc Prosthetic foot with energy transfer
US7727285B2 (en) 2007-01-30 2010-06-01 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US7794506B2 (en) 2007-09-18 2010-09-14 Freedom Innovations, Llc Multi-axial prosthetic ankle
US7824446B2 (en) 2006-12-06 2010-11-02 Freedom Innovations, Llc Prosthetic foot with longer upper forefoot and shorter lower forefoot
US7879110B2 (en) 1998-04-10 2011-02-01 Ossur Hf Foot prosthesis having cushioned ankle
US8034121B2 (en) 2008-04-18 2011-10-11 Freedom Innovations, Llc Prosthetic foot with two leaf-springs joined at heel and toe
US8500825B2 (en) 2010-06-29 2013-08-06 Freedom Innovations, Llc Prosthetic foot with floating forefoot keel
US20140012397A1 (en) * 2011-03-23 2014-01-09 Otto Bock Healthcare Gmbh Prosthetic foot insert and prosthetic foot
US8808396B2 (en) * 2012-08-27 2014-08-19 Yao-Teng Cheng Prosthetic foot structure

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6527811B1 (en) * 1989-04-13 2003-03-04 Van L. Phillips Foot prosthesis with modular foot plate
US5944760A (en) * 1997-08-04 1999-08-31 Roland J. Christensen Family Limited Partnership Prosthetic foot with reinforcing member
US6241776B1 (en) 1997-08-04 2001-06-05 Roland Christensen Prosthetic foot with reinforcing member
US7879110B2 (en) 1998-04-10 2011-02-01 Ossur Hf Foot prosthesis having cushioned ankle
US6899737B1 (en) 1998-04-10 2005-05-31 Van L. Phillips Foot prosthesis having cushioned ankle
US7686848B2 (en) 2000-06-30 2010-03-30 Freedom Innovations, Llc Prosthetic foot with energy transfer
US7063727B2 (en) 2000-10-26 2006-06-20 Van L. Phillips Foot prosthesis having cushioned ankle
US6805717B2 (en) 2002-10-08 2004-10-19 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Manager Of The Roland J. Christensen Family Limited Partnership Energy-storing prosthetic foot with elongated forefoot
US6911052B2 (en) 2002-10-08 2005-06-28 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with oblique attachment
US6929665B2 (en) 2002-10-08 2005-08-16 Roland J. Christensen Prosthetic foot with a resilient ankle
US7824446B2 (en) 2006-12-06 2010-11-02 Freedom Innovations, Llc Prosthetic foot with longer upper forefoot and shorter lower forefoot
US7727285B2 (en) 2007-01-30 2010-06-01 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US7794506B2 (en) 2007-09-18 2010-09-14 Freedom Innovations, Llc Multi-axial prosthetic ankle
US8034121B2 (en) 2008-04-18 2011-10-11 Freedom Innovations, Llc Prosthetic foot with two leaf-springs joined at heel and toe
US8500825B2 (en) 2010-06-29 2013-08-06 Freedom Innovations, Llc Prosthetic foot with floating forefoot keel
US20140012397A1 (en) * 2011-03-23 2014-01-09 Otto Bock Healthcare Gmbh Prosthetic foot insert and prosthetic foot
US10299942B2 (en) * 2011-03-23 2019-05-28 Ottobock Se & Co. Kgaa Prosthetic foot insert and prosthetic foot
US8808396B2 (en) * 2012-08-27 2014-08-19 Yao-Teng Cheng Prosthetic foot structure

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