GB2080114A - Method of making an artificial leg - Google Patents

Method of making an artificial leg Download PDF

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Publication number
GB2080114A
GB2080114A GB8023308A GB8023308A GB2080114A GB 2080114 A GB2080114 A GB 2080114A GB 8023308 A GB8023308 A GB 8023308A GB 8023308 A GB8023308 A GB 8023308A GB 2080114 A GB2080114 A GB 2080114A
Authority
GB
United Kingdom
Prior art keywords
foot
ankle
shin
attachment member
socket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8023308A
Other versions
GB2080114B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vessa Ltd
Original Assignee
Vessa Ltd
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 Vessa Ltd filed Critical Vessa Ltd
Priority to GB8023308A priority Critical patent/GB2080114B/en
Priority to DE19813127897 priority patent/DE3127897A1/en
Priority to FR8113900A priority patent/FR2486797A1/en
Priority to US06/283,865 priority patent/US4395783A/en
Priority to JP11013081A priority patent/JPS5745860A/en
Publication of GB2080114A publication Critical patent/GB2080114A/en
Application granted granted Critical
Publication of GB2080114B publication Critical patent/GB2080114B/en
Expired legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/76Means for assembling, fitting or testing prostheses, e.g. for measuring or balancing, e.g. alignment means

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  • 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)

Abstract

In the manufacture of an artificial leg a thigh member is connected to a preformed endoskeletal shin member with a moulded on cosmesis of cellular plastics material. The shin member is available in preselected sizes. <IMAGE>

Description

SPECIFICATION Method of making an artificial leg The present invention relates to a method for making an artificial leg which is assembled from a stock of modular components which can be held by a limb fitting centre and which can be assembled rapidly and inexpensively.
By the present method it is anticipated that patients will be able to be fitted with a leg in the course of a single working day, and the leg has sufficient cosmesis and in the embodiment described operates sufficiently well to be accepted for medium or long term use by relatively inactive patients such as geriatric patients. Accordingly the need to fit such patients with a pylon and then to fit them with a definitive leg can be avoided.
In one aspect the invention provides a method of making an artificial leg which comprises: providing a thigh member having a stump socket at its upper end supported on struts from a knee joint member; providing a plurality of preformed endoskeletal shin members each having an identical knee support member at its upper end, an identical ankle attachment member at its lower end, a shin tube rigidly connecting the knee support member and the ankle attachment member and a generally tubular cosmesis of cellular plastics material moulded onto the shin tube between the knee support member and the ankle attachment member, the shin tubes differing in length within a permitted range of length values; forming a pivoted knee joint in which load is transmitted from the knee joint member to the knee support member; of a selected one of the shin members of a length; and connecting a foot to the ankle attachment member.
A preferred method of forming the stump socket involves the steps of moulding a plurality of generally tubular socket blanks from sheet plastics material, the blanks having adjoining unconnected edges defining a vertical split in the socket blank; fitting a selected one of the socket blanks to the stump and cutting the adjoining edges so that the socket blank fits around the stump with the cut edges abutting; fastening the cut edges to form the socket; and fastening the socket to the struts.
Preferably the endoskeletal shin members are formed by securing a knee support member and an ankle attachment member to opposed ends of a shin tube, placing the assembly in a mould internally shaped to simulate the shin portion of a leg and introducing into the mould a resin composition which foams and cures to a cellular plastics material.
The leg substantially as described below and illustrated in the drawings is believed to be novel per se.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: - Figure 1 is a side view in vertical section of an artificial leg according to the invention; Figure 2 is an enlarged underneath view of an ankle attachment member used in the shin portion of the leg illustrated in Fig. 1; Figure 3 is enlarged plan view of an ankle base interconnecting the shin portion of the leg to the foot; and Figures 4a, 4b and 4c are top side and underneath views on an enlarged scale of a locating disc which fits between the ankle base and the ankle.
The leg shown in Fig. 1 has a thigh member indicated generally by 10 and a shin member indicated generally by 12 interconnected by a knee structure indicated generally by 13. A uniaxial foot indicated generally by 14 and believed to be of novel construction is fitted to the lower end of the shin member 12, but is optional and the needs of some patients may be met by a conventional solid ankle cushion heel (SACH) foot.
The thigh member 10 includes a load bearing stump socket 15 which is supported on struts 16 whose lower ends are secured in a knee fairing 17 of metal or preferably of a filled thermoplastics material such as glass reinforced nylon. The stump socket 15 is formed from a piece of thermo-plastics sheet of a selected one of a range of standard sizes which is rough-formed to the approximate dimensions and shape by vacuum or drape moulding. The resulting socket blank is fitted to the patient and the adjoining split edges can be trimmed to alter the angle of the socket in either direction and to alter the socket circumference. After the edges have been cut they are butted together and a plastics strip 18 is laid over them by rivets 19 whereby there is produced a socket to fit an individual stump. Alternatively butted edges of the stump socket may be welded together.
The top ends of the struts 16 are secured to the outer surface of the stump socket 15 using wing plates 20 of aluminium as reinforcement and the lower ends of struts 16 are riveted to the inner face of the knee fairing 17.
The knee fairing 17 has a generally hemispherical lower end as shown and is supported by a knee socket 25 forming part of the shin member 12 which is also made of a glass filled nylon and has a part spherical inner top surface complementary to the knee fairing. A transverse knee pivot shaft 26 interconnects the fairing 17 with the socket 25.
Forward travel of the thigh member 10 relative to the shin member 12 beyond the straight position illustrated is prevented by abutment of a rubber buffer 27 supported at an anterior portion of the knee fairing by a buttress member 28 with a thickened loadaccepting top anterior portion 29 of the socket 25. A pivoted link member 30 operated by a release handle 31 on the exterior of the knee fairing retracts a locking plunger 32 against the action of coil spring 33 from engagement with a locking face 34 in a posterior portion of the knee socket 25 thereby allowing flexion of the thigh member 10 relative to the shin member 12.
It will be understood that the uniaxial knee joint shown could for certain patients be replaced by a polycentric joint having a 4-bar or 6-bar linkage or by a stabilised knee joint of the general kind described in U.K. Patent No.
874327.
The shin member 12 is, as may be seen, of the endoskeletal type and has the knee socket 25 previously referred to secured to a shin tube 36 (e.g., by riveting it into a depending boss 35). The lower end of the tube 36 is secured in an upstanding boss 37 forming part of an ankle attachment member 38 also of filled thermoplastics material having a generally planar lower face in which there is a centrally positioned vertically directed internally threaded metal insert 39 for attachment of a uniaxial foot as described below. A cosmesis 40 in low density elastomer is formed surrounding the shin tube 36 between the socket 25 and the attachment member 38.
The shin assembly 12 is formed by cutting the tube 36 to length and riveting socket 25 and attachment member 37 to opposed ends thereof, after which the assembly is placed in a mould and a foamable plastics composition is introduced into the mould and allowed to cure. This structure of the shin member has the advantage that it can readily be provided in the form of a plurality of preformed shin members each of one of a range of possible standard lengths, and a limb fitter making a leg for a particular patient at a limb fitting centre can select the appropriate shin member for the particular patient who he is fitting.
Hitherto the shin members have been made individually and the cosmesis has also been made and shaped individually which is a laborious process. The provision of shin members in stock sizes which can be stored at a limb fitting centre in combination with the stump socket forming technique previously described enables a patient to be fitted with an artiticial leg during the course of a one-day visit to a limb fitting centre and is advantageous to the patient who is spared the trouble of repeated visits to a limb fitting centre and delay in receipt of his artificial leg as having self-evident cost advantages.
The shin member 12 is fitted with a uniaxial foot 14 made up of a body 25 of a low density micro-cellular elastomeric material in which is moulded a relatively rigid keel 41 of glass-reinforced plastics material. An ankle base 42 also of glass-reinforced plastics material is secured at its upper face to the ankle attachment member 38 and at its lower face is pivoted to the keel 41 about a transverse ankle pivot 43 which is held within a tee-bolt 43a with intermediate bearing bushes. An instep buffer 44 and a heel buffer 44a both of natural or synthetic rubber are located respectively between anterior and posterior portions of the ankle base 42 and the keel 41 to provide the appropriate degree of resistance to'.
flexion of the foot 14 relative to the shin member 12 from a normal position which they define. The ankle base 42 is secured to the angle attachment member 38 against movement longitudinally apart by means of a bolt 24 which is engaged in the threaded insert 39 and angular location of the foot 14 relative to the shin member 12 is achieved by means of a disc 46 having rows of circumferentially spaced teeth 47, 48 on its upper and lower faces which locate in respective sockets in attachment member 38 and an ankle base 42 as described in more detail below. The ankle base may be selected from a range of standardised injection-moulded ankle bases each having different lower face angles so that variation in heel height can be accommodated.The full range of ankle bases can be produced in a single mould, pads defining the desired angle for the lower face of the ankle base being inserted into the mould before the moulding operation is carried out.
The ankle attachment member of Fig. 2 is formed with a plurality of recesses 60 disposed about the circumference of a circle to receive the teeth 47 of the disc 46. It will be noted that the ankle attachment member has eighteen recesses at equal angular spacings of 20 and the top face of the disc 46 has six teeth at angular spacings of 20 . The ankle base 42 is formed with sixteen sockets 61 disposed at equal angular spacings of 22.5 and the disc 46 is formed on its lower face with eight teeth 48 at angular spacings of 45". This differential spacing of the teeth on the upper and lower faces of the disc 46 enables the angular position of the disc 46- z relative to the ankle adaptor 38 and the angular position of the ankle base 42 relative to the disc to be combined so that the foot 14 assumes any one of a large range of closely spaced angular positions relative to the anterior-posterior plane of the leg. The disc 46 is firmly held in position by the bolt 24 and the insert 39, and engagement of the teeth 47, 48 in their respective sockets 60 and 61 positively locates the foot 14 at a desired toeout angle. The teeth provide a relatively large bearing surface well spaced from the bolt 48 and therefore in a good position to resist turning forces on the foot 14.

Claims (14)

1. A method of making an artificial leg which comprises: providing a thigh member having a stump socket at its upper end supported on struts from a knee joint member; providing a plurality of preformed endoskeletal shin members each having an identical knee support member at its upper end, an identical ankle attachment member at its lower end, a shin tube rigidly connecting the knee support member and the ankle attachment member and a generally tubular cosmesis of cellular plastics material moulded onto the shin tube between the knee support member and the ankle attachment member, the shin tubes differing in length within a permitted range of length values; forming a pivoted knee joint in which load is transmitted from the knee joint member to the knee support member of a selected one of the shin members of a length; and connecting a foot to the ankle attachment member.
2. A method according to Claim 1, further comprising the steps of: moulding a plurality of generally tubular socket blanks from sheet plastics material, the blanks having adjoining unconnected edges defining a vertical split in the socket blank; fitting a selected one of the socket blanks to the stump and cutting the adjoining edges so that the socket blank fits around the stump with the cut edges abutting; fastening the cut edges to form the socket; and fastening the socket to the struts.
3. A method according to Claim 2, wherein the cut edges are fastened by riveting to them an overlying strip of plastics material.
4. A method according to any preceding claim, wherein the endoskeletal shin members are formed by securing a knee support member and an ankle attachment member to opposed ends of a shin tube, placing the assembly in a mould internally shaped to simulate the shin portion of a leg and introducing into the mould a resin composition which foams and cures to a cellular plastics material.
5. A method according to Claim 4, wherein the knee support member and the ankle attachment member are injected in a moulded glass reinforced plastics material.
6. A method according to any preceding claim, wherein the knee joint member and the knee support member are interconnected by a transversely directed pivot.
7. A method according to any preceding claim, wherein a SACH foot is connected to the angle attachment member.
8. A method according to any of Claims 1 to 6, wherein a uniaxial foot is connected to the ankle attachment member.
9. A method according to Claim 8, wherein the uniaxial foot has a keel and an ankle base pivoted to the keel and attached to the ankle attachment member, the ankle base being selected from a range of similar ankle bases differing in the angle which the lower face thereof makes with the top face.
10. A method according to Claim 7, 8 or 9, wherein a disc is sandwiched between the ankle attachment member and the foot, the disc having teeth projecting from its upper and lower faces and locating in recesses in the ankle attachment member and the foot whereby the foot is located in a fixed predetermined angular position relative to the leg.
11. A method according to Claim 10, wherein the angular spacing of the teeth on the upper face of the disc differs from the angular spacing between the teeth on the lower face of the disc so that close adjustment can be made of the angular position of the foot relative to the leg.
12. A method of making an artificial leg substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
13. An artificial leg having a thigh member and a shin member substantially as described with reference to and as illustrated in Fig. 1 of the accompanying drawings and either having a SACH foot or having a uniaxial foot.
14. An artificial leg according to Claim 12, having a uniaxial foot substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB8023308A 1980-07-16 1980-07-16 Method of making an artificial leg Expired GB2080114B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB8023308A GB2080114B (en) 1980-07-16 1980-07-16 Method of making an artificial leg
DE19813127897 DE3127897A1 (en) 1980-07-16 1981-07-15 "METHOD FOR PRODUCING A LEG PROSTHESIS AND LEG PROSTHESES PRODUCED BY THIS PROCESS"
FR8113900A FR2486797A1 (en) 1980-07-16 1981-07-16 METHOD FOR MANUFACTURING AN ARTIFICIAL LEG AND ASSEMBLY OF A TIBIAL SEGMENT AND AN ARTIFICIAL LEG FOOT
US06/283,865 US4395783A (en) 1980-07-16 1981-07-16 Method of making an artificial leg
JP11013081A JPS5745860A (en) 1980-07-16 1981-07-16 Manufacture of artificial leg and assembly for artificial leg

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8023308A GB2080114B (en) 1980-07-16 1980-07-16 Method of making an artificial leg

Publications (2)

Publication Number Publication Date
GB2080114A true GB2080114A (en) 1982-02-03
GB2080114B GB2080114B (en) 1984-03-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8023308A Expired GB2080114B (en) 1980-07-16 1980-07-16 Method of making an artificial leg

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Country Link
JP (1) JPS5745860A (en)
GB (1) GB2080114B (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068658A2 (en) * 1981-06-09 1983-01-05 J.E. HANGER &amp; COMPANY LIMITED Knee joint for artificial legs
EP0167727A2 (en) * 1984-04-19 1986-01-15 Teufel, Wilhelm Julius Artificial knee joint
EP0205785A1 (en) * 1985-05-28 1986-12-30 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Locking device for knee joint
EP0418420A1 (en) * 1989-09-22 1991-03-27 IPOS GmbH &amp; CO. KG. Process for the production of an above-knee prosthesis
WO2014153244A1 (en) * 2013-03-14 2014-09-25 Lim Innovations, Inc. Modular prosthetic sockets and methods for making and using same
US8978224B2 (en) 2011-11-12 2015-03-17 Lim Innovations, Inc. Modular prosthetic sockets and methods for making same
US20150168943A1 (en) * 2013-12-16 2015-06-18 Lim Innovations, Inc. Method and system for assembly of a modular prosthetic socket based on residual limb metrics
US9468542B2 (en) 2013-06-21 2016-10-18 Lim Innovations, Inc. Prosthetic socket and socket liner with moisture management capability
US9474633B2 (en) 2014-05-05 2016-10-25 Lim Innovations, Inc. Alignable coupling assembly for connecting two prosthetic limb components
US9962273B2 (en) 2015-05-13 2018-05-08 Ossur Iceland Ehf Adjustable socket system
US10172728B2 (en) 2015-11-25 2019-01-08 Lim Innovations, Inc. Transtibial prosthetic socket with textile jacket
US10206795B2 (en) 2015-07-27 2019-02-19 Lim Innovations, Inc. Prosthetic support socket for an osseointegrated femoral abutment
US10245775B2 (en) 2014-06-04 2019-04-02 Lim Innovations, Inc. Method and apparatus for transferring a digital profile of a residual limb to a prosthetic socket strut
US10426640B2 (en) 2010-10-22 2019-10-01 Ossur Hf Adjustable socket system
US10543112B2 (en) 2012-06-28 2020-01-28 Ossur Hf Adjustable prosthetic limb system
US10806607B2 (en) 2017-02-06 2020-10-20 Ossur Iceland Ehf Adjustable socket system
US10940028B2 (en) 2017-02-06 2021-03-09 Ossur Iceland Ehf Adjustable socket system
US11419740B2 (en) 2017-02-06 2022-08-23 Ossur Iceland Ehf Adjustable socket system
US11642233B2 (en) 2020-09-04 2023-05-09 Ossur Iceland Ehf Interchangeable distal end for a prosthetic socket system

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068658A2 (en) * 1981-06-09 1983-01-05 J.E. HANGER &amp; COMPANY LIMITED Knee joint for artificial legs
EP0068658A3 (en) * 1981-06-09 1983-02-16 J.E. Hanger & Company Limited Knee joint for artificial limbs
EP0167727A3 (en) * 1984-04-19 1987-04-15 Teufel, Wilhelm Julius Artificial knee joint
EP0167727A2 (en) * 1984-04-19 1986-01-15 Teufel, Wilhelm Julius Artificial knee joint
EP0205785A1 (en) * 1985-05-28 1986-12-30 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Locking device for knee joint
EP0418420A1 (en) * 1989-09-22 1991-03-27 IPOS GmbH &amp; CO. KG. Process for the production of an above-knee prosthesis
US10426640B2 (en) 2010-10-22 2019-10-01 Ossur Hf Adjustable socket system
US11351044B2 (en) 2010-10-22 2022-06-07 Ossur Hf Adjustable socket system
US8978224B2 (en) 2011-11-12 2015-03-17 Lim Innovations, Inc. Modular prosthetic sockets and methods for making same
US9044349B2 (en) 2011-11-12 2015-06-02 Lim Innovations, Inc. Modular prosthetic sockets and methods for making same
US9468543B2 (en) 2011-11-12 2016-10-18 Lim Innovations, Inc. Modular prosthetic sockets and methods for making same
US9549828B2 (en) 2011-11-12 2017-01-24 Lim Innovations, Inc. Modular prosthetic sockets and methods for making same
US10543112B2 (en) 2012-06-28 2020-01-28 Ossur Hf Adjustable prosthetic limb system
US11844710B2 (en) 2012-06-28 2023-12-19 Ossur Hf Adjustable prosthetic limb system
US11246724B2 (en) 2012-06-28 2022-02-15 Ossur Hf Adjustable prosthetic limb system
WO2014153244A1 (en) * 2013-03-14 2014-09-25 Lim Innovations, Inc. Modular prosthetic sockets and methods for making and using same
US9468542B2 (en) 2013-06-21 2016-10-18 Lim Innovations, Inc. Prosthetic socket and socket liner with moisture management capability
US9980779B2 (en) 2013-12-16 2018-05-29 Lim Innovations, Inc. Method and system for assembly of a modular prosthetic socket based on residual limb metrics
US10251710B2 (en) 2013-12-16 2019-04-09 Lim Innovations, Inc. Method and system for assembly of a modular prosthetic socket based on residual limb metrics
US20150168943A1 (en) * 2013-12-16 2015-06-18 Lim Innovations, Inc. Method and system for assembly of a modular prosthetic socket based on residual limb metrics
US9474633B2 (en) 2014-05-05 2016-10-25 Lim Innovations, Inc. Alignable coupling assembly for connecting two prosthetic limb components
US10245775B2 (en) 2014-06-04 2019-04-02 Lim Innovations, Inc. Method and apparatus for transferring a digital profile of a residual limb to a prosthetic socket strut
US10918503B2 (en) 2015-05-13 2021-02-16 Ossur Iceland Ehf Adjustable socket system
US9962273B2 (en) 2015-05-13 2018-05-08 Ossur Iceland Ehf Adjustable socket system
US10206795B2 (en) 2015-07-27 2019-02-19 Lim Innovations, Inc. Prosthetic support socket for an osseointegrated femoral abutment
US10179056B2 (en) 2015-11-25 2019-01-15 Lim Innovations, Inc. Transfemoral prosthetic socket with a textile-based cover and intra-frame force applicators
US10172728B2 (en) 2015-11-25 2019-01-08 Lim Innovations, Inc. Transtibial prosthetic socket with textile jacket
US10806607B2 (en) 2017-02-06 2020-10-20 Ossur Iceland Ehf Adjustable socket system
US10940028B2 (en) 2017-02-06 2021-03-09 Ossur Iceland Ehf Adjustable socket system
US10993819B2 (en) 2017-02-06 2021-05-04 Ossur Iceland Ehf Adjustable socket system
US11419740B2 (en) 2017-02-06 2022-08-23 Ossur Iceland Ehf Adjustable socket system
US11801154B2 (en) 2017-02-06 2023-10-31 Ossur Iceland Ehf Adjustable socket system
US11642233B2 (en) 2020-09-04 2023-05-09 Ossur Iceland Ehf Interchangeable distal end for a prosthetic socket system

Also Published As

Publication number Publication date
JPS5745860A (en) 1982-03-16
GB2080114B (en) 1984-03-14

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