GB2197204A - Femoral prosthesis - Google Patents

Femoral prosthesis Download PDF

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Publication number
GB2197204A
GB2197204A GB08626836A GB8626836A GB2197204A GB 2197204 A GB2197204 A GB 2197204A GB 08626836 A GB08626836 A GB 08626836A GB 8626836 A GB8626836 A GB 8626836A GB 2197204 A GB2197204 A GB 2197204A
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GB
United Kingdom
Prior art keywords
prosthesis
stem
femur
body part
neck
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
GB08626836A
Other versions
GB2197204B (en
GB8626836D0 (en
Inventor
Ronald James Furlong
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.)
Joint Replacement Instrumentation Ltd
Original Assignee
Joint Replacement Instrumentation 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 Joint Replacement Instrumentation Ltd filed Critical Joint Replacement Instrumentation Ltd
Priority to GB8626836A priority Critical patent/GB2197204B/en
Publication of GB8626836D0 publication Critical patent/GB8626836D0/en
Publication of GB2197204A publication Critical patent/GB2197204A/en
Application granted granted Critical
Publication of GB2197204B publication Critical patent/GB2197204B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/367—Proximal or metaphyseal parts of shafts
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2/3676—Distal or diaphyseal parts of shafts
    • 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
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4607—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of hip femoral endoprostheses
    • 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
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30138—Convex polygonal shapes
    • A61F2002/30143—Convex polygonal shapes hexagonal
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
    • A61F2002/30362—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit with possibility of relative movement between the protrusion and the recess
    • A61F2002/30364—Rotation about the common longitudinal axis
    • A61F2002/30367—Rotation about the common longitudinal axis with additional means for preventing said rotation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A61F2002/30797—Blind bores, e.g. of circular cross-section internally-threaded
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • A61F2002/30813—Stepped or enlarged blind bores, e.g. having discrete diameter changes
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30884—Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A61F2002/3631—Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • 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
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4619—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof for extraction
    • 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
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0017—Angular shapes
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389—The prosthesis being coated or covered with a particular material
    • A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (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)
  • Prostheses (AREA)

Abstract

A femoral prosthesis comprises a straight stem (10) and an upper body part (12), a neck (13) extending from the body part (12) and, at the base of the neck a lip (14) extending outwardly along three sides of the prosthesis. The body part (12) may also carry a radially-projecting axially- extending fin (15). Between its body part (12) and lower stem (10) the prosthesis stem is formed with a tapered section (16) which narrows downwardly and provides an angled shoulder. The prosthesis can be formed as a single finished forging from titanium, steel or, preferably. from titanium/vanadium/aluminium alloy. and the part (12) and the length (11) are coated with calcium hydroxy- apatite (Ca5(PO4)3. The upper part (12) can have a recessed hexagonal socket which extends downwardly to a bore (18), to allow possible extraction of the prosthesis. <IMAGE>

Description

SPECIFICATION Femoral prosthesis This invention relates to orthopaedic prostheses and, more specifically, to a straightstem femoral prosthesis.
Femoral prostheses have been known and used, with considerable success, for a good number of years in so-called 'total hip replacements'. Very briefly, the operation involves extracting the head of the patient's femur from the acetabular cavity in the pelvis, replacing the neck and head of the femur with a femoral prosthesis, securing a cup prosthesis into the acetabular cavity, and inserting the head of the femoral prosthesis into the cup.
The preferred form of femoral prosthesis is now the straight-stem prosthesis which has replaced the earlier curved-stem or 'banana" types, and other improvements have evolved over the years. For example, apatite coatings have been applied to the prostheses stems to promote ingrowth of bone and anchor the prosthesis in the femur shaft without the use of bone cement. As a result, the success rate in hip-joint replacement operations is extremely high, reaching well over 90% under appropriate conditions.
One residual problem however has been that some cemented femoral prostheses have become slightly loose and unstable after a time; it is an object of this invention to provide a femoral prosthesis which will produce generally improved results and, specifically, will remain firmly in position on a more-or-less permanent basis.
According to the present invention there is provided a femoral prosthesis having a straight stem provided at its upper end with a neck and with a lip adapted to engage the upper end of the severed femur, characterised in that the stem is formed at an intermediate location in its length with a tapered section which narrows downwardly and provides an angled shoulder to engage a similarly shaped section formed inside the tubular femur shaft.
Preferably, the upper end of the stem is formed with a radially-projecting axially-extending fin to engage in the shaft of the femur which has been appropriately shaped, to resist rotation of the prosthesis.
Preferably, also, the prosthesis is formed from titanium/vanadium/aluminium alloy, and the straight stem is coated with calcium hydroxy-apatite.
According to a preferred further feature of the present invention, an upwardly-opening tapped bore is formed in the upper part of the stem to receive a screwed-rod instrument and so provide for possible extraction of the prosthesis. The tapped bore may be formed as a downward continuation of a shaped, usuallyhexagonal, socket in the upper part which is adapted to receive an Allen key instrument to facilitate rotary manipulation of the prosthesis.
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings in which: Figure 1 is a side elevation showing a femoral prosthesis according to the present invention; Figure 2 is a rear view in the direction of arrow 11 of Fig. 1; Figure 3 is a plan view corresponding to Fig. 1; Figure 4 is a side view showing the prosthesis, with its ceramic head, after insertion in the shaft of a femur.
Referring to Figs. 1 to 3 of the drawings, the femoral prosthesis comprises a straight stem 10 having a length 11 of circular section and an upper body part 12. A neck 13 extends from the body part 12 and, at the base of the neck, a lip 14 extends outwardly along three sides of the prosthesis. The body part 12 is also formed with a radially-projecting axially-extending fin 15 and, between its body part and circular-section length, the prosthesis stem is formed with a tapered section 16 which narrows downwardly and provides an angled shoulder.
The prosthesis is formed as a single finished forging from titanium, steel or, more desirably, from titanium/vanadium/aluminium alloy, and the part 12 and the length 11 are coated with calcium hydroxy-apatite, Ca#(PO4)3 OH.
As clearly shown in Fig. 3, the upper part 12 is formed with a hexagonal socket 17, and the socket extends downwardly as a tapped bore 18.
When inserted in an upper end of the tabular shaft 19 of a patient's femur (Fig. 4), which has been suitably prepared after removal of the neck with its head, the lip 14 engages the upper, severed face of the femur and, also, the angled shoulder provided by section 16 engages a correspondingly-prepared part in the femur. The combination of these two engagements, assisted by the bottom, rounded end 20 of the stem jamming in the shaft, plus the rotational stability afforded by the fin 15 which creates a slot in the femur, act to hold the prosthesis firmly and stably in position. After a period of a few weeks, the patient's bone will grow onto the apatite coating to ensure permanent fixation of the prosthesis. It is believed that this effect arises to a substantial extent due to the aforementioned stabilizing shoulder (16), and that this shoulder in combination with the lip 14, the rounded lower end 20 and the fin 15, ensure that the prosthesis will remain firmly and stably in position for a considerable number of years.
It might be added that the neck 13 includes an outer slightly-tapered section 21 which receives a ceramic head 22 (Fig. 4) adapted to be received by a prosthetic cup (not shown) which is fitted into the prepared acetabular cavity of the patient's pelvis. Such a cup is illustrated in British Design Registration No.
1030276, and comprises a polyethylene socket resting in an apatite-coated metal shell.
Ceramic heads (22) bored to alternative depths are provided for appropriate compatibility with the required length of the replaced neck of the femur.

Claims (5)

1. A femoral prosthesis having a straight stem provided at its upper end with a neck and with a lip adapted to engage the upper end of the severed femur, characterised in that the stem is formed at an intermediate location in its length with a tapered section which narrows downwardly and provides an angled shoulder to engage a similarly shaped section formed inside the tubular femur shaft.
2. A prosthesis as claimed in Claim 1, wherein the upper end of the stem is formed with a radially-projecting axially-extending fin to engage in the shaft of the femur which has been apropriately shaped, so as to resist rotation of the implanted prosthesis.
3. A prosthesis as claimed in Claim 1 or 2, which is formed from a titanium/vanadium/aluminium alloy, and the straight stem is coated with calcium hydroxy-apatite.
4. A prosthesis as claimed in Claim 1, 2 or 3, wherein an upwardly-opening tapped bore is formed in the upper part of the stem to receive a screwed-rod instrument and so provide for possible extraction of the prosthesis.
5. A femoral prosthesis constructed substantially as hereinbefore described with reference to the accompanying drawings.
GB8626836A 1986-11-10 1986-11-10 Femoral prosthesis Expired - Lifetime GB2197204B (en)

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Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8626836A GB2197204B (en) 1986-11-10 1986-11-10 Femoral prosthesis

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GB8626836D0 GB8626836D0 (en) 1986-12-10
GB2197204A true GB2197204A (en) 1988-05-18
GB2197204B GB2197204B (en) 1990-08-15

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0339879A1 (en) * 1988-04-26 1989-11-02 Headcorn Instrumentation Ltd. Hip prosthesis
EP0359097A1 (en) * 1988-09-06 1990-03-21 Friedrich Baumann Femoral shaft for a hip prosthesis
FR2652259A1 (en) * 1989-09-27 1991-03-29 Schwartz Claude Femoral prosthesis with flexible engagement in the metaphysis
FR2676914A1 (en) * 1991-05-28 1992-12-04 Tec Implant Sarl Anatomical femoral prosthesis
US5755811A (en) * 1995-08-25 1998-05-26 Zimmer, Inc. Prosthetic implant with fins
ES2138921A1 (en) * 1997-09-12 2000-01-16 Arnaud Jean Paul Improvements in the femoral stem and cotyloid cavity assemblies of total hip prostheses.
US6132469A (en) * 1997-11-07 2000-10-17 Biomet, Inc. Acetabular liner extractor
FR2996119A1 (en) * 2012-10-03 2014-04-04 Lape Medical Femoral stem for hip prosthesis to be inserted into medullary cavity of femur in young patient, has support unit extending radially from inner, front, and rear faces of stem, and including interruptions on front and rear faces of stem

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Publication number Priority date Publication date Assignee Title
GB1418757A (en) * 1972-05-04 1975-12-24 Saratovsky G Meditsinksy I Endoprosthesis of the proximal portion of the femur
GB1421366A (en) * 1972-05-04 1976-01-14 Saratovsky G Meditsninsky I Artificial hip-joint
GB1485295A (en) * 1973-09-20 1977-09-08 Minnesota Mining & Mfg Orthopaedic prosthetic implant devices
GB1489887A (en) * 1973-11-12 1977-10-26 Rosenthal Technik Ag Femoral head prostheses
GB1531487A (en) * 1974-12-27 1978-11-08 Mahay & Cie Complete hip-joint prosthesis
EP0077868A1 (en) * 1981-10-26 1983-05-04 Nunzio Godoli Hip prosthesis as expanding femoral component
GB2118043A (en) * 1982-04-08 1983-10-26 Robin Arthur Denham Femoral prosthesis
EP0032165B1 (en) * 1980-01-14 1983-12-28 GebràœDer Sulzer Aktiengesellschaft Blade-shaped shaft for anchoring a hip joint prosthesis
EP0158014A1 (en) * 1984-03-06 1985-10-16 GebràœDer Sulzer Aktiengesellschaft Hip prosthesis
EP0159510A2 (en) * 1984-04-14 1985-10-30 HOWMEDICA INTERNATIONAL, INC. Zweigniederlassung Kiel Hip joint endoprosthesis
EP0170982A1 (en) * 1984-07-26 1986-02-12 Ivica Jerkovic Joint endoprosthesis, especially hip joint prosthesis
EP0187903A1 (en) * 1984-12-13 1986-07-23 GebràœDer Sulzer Aktiengesellschaft Hip joint prosthesis
US4642124A (en) * 1984-06-11 1987-02-10 Clemson University Hip prosthesis

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1421366A (en) * 1972-05-04 1976-01-14 Saratovsky G Meditsninsky I Artificial hip-joint
GB1418757A (en) * 1972-05-04 1975-12-24 Saratovsky G Meditsinksy I Endoprosthesis of the proximal portion of the femur
GB1485295A (en) * 1973-09-20 1977-09-08 Minnesota Mining & Mfg Orthopaedic prosthetic implant devices
GB1489887A (en) * 1973-11-12 1977-10-26 Rosenthal Technik Ag Femoral head prostheses
GB1531487A (en) * 1974-12-27 1978-11-08 Mahay & Cie Complete hip-joint prosthesis
EP0032165B1 (en) * 1980-01-14 1983-12-28 GebràœDer Sulzer Aktiengesellschaft Blade-shaped shaft for anchoring a hip joint prosthesis
EP0077868A1 (en) * 1981-10-26 1983-05-04 Nunzio Godoli Hip prosthesis as expanding femoral component
GB2118043A (en) * 1982-04-08 1983-10-26 Robin Arthur Denham Femoral prosthesis
EP0158014A1 (en) * 1984-03-06 1985-10-16 GebràœDer Sulzer Aktiengesellschaft Hip prosthesis
EP0159510A2 (en) * 1984-04-14 1985-10-30 HOWMEDICA INTERNATIONAL, INC. Zweigniederlassung Kiel Hip joint endoprosthesis
US4642124A (en) * 1984-06-11 1987-02-10 Clemson University Hip prosthesis
EP0170982A1 (en) * 1984-07-26 1986-02-12 Ivica Jerkovic Joint endoprosthesis, especially hip joint prosthesis
EP0187903A1 (en) * 1984-12-13 1986-07-23 GebràœDer Sulzer Aktiengesellschaft Hip joint prosthesis

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0339879A1 (en) * 1988-04-26 1989-11-02 Headcorn Instrumentation Ltd. Hip prosthesis
US4944764A (en) * 1988-04-26 1990-07-31 Headcorn Instrumentation Ltd. Hip prosthesis
EP0359097A1 (en) * 1988-09-06 1990-03-21 Friedrich Baumann Femoral shaft for a hip prosthesis
FR2652259A1 (en) * 1989-09-27 1991-03-29 Schwartz Claude Femoral prosthesis with flexible engagement in the metaphysis
FR2676914A1 (en) * 1991-05-28 1992-12-04 Tec Implant Sarl Anatomical femoral prosthesis
US5755811A (en) * 1995-08-25 1998-05-26 Zimmer, Inc. Prosthetic implant with fins
ES2138921A1 (en) * 1997-09-12 2000-01-16 Arnaud Jean Paul Improvements in the femoral stem and cotyloid cavity assemblies of total hip prostheses.
US6132469A (en) * 1997-11-07 2000-10-17 Biomet, Inc. Acetabular liner extractor
FR2996119A1 (en) * 2012-10-03 2014-04-04 Lape Medical Femoral stem for hip prosthesis to be inserted into medullary cavity of femur in young patient, has support unit extending radially from inner, front, and rear faces of stem, and including interruptions on front and rear faces of stem

Also Published As

Publication number Publication date
GB2197204B (en) 1990-08-15
GB8626836D0 (en) 1986-12-10

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