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WO2005079710A1 - Hip prosthesis stem provided with a gripping membe connected to it - Google Patents

Hip prosthesis stem provided with a gripping membe connected to it Download PDF

Info

Publication number
WO2005079710A1
WO2005079710A1 PCT/IB2005/000068 IB2005000068W WO2005079710A1 WO 2005079710 A1 WO2005079710 A1 WO 2005079710A1 IB 2005000068 W IB2005000068 W IB 2005000068W WO 2005079710 A1 WO2005079710 A1 WO 2005079710A1
Authority
WO
WIPO (PCT)
Prior art keywords
stem
gripping member
jaws
forceps
hip prosthesis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2005/000068
Other languages
French (fr)
Inventor
Sheila Ragbir
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.)
Mariasal Investment NV
Original Assignee
Mariasal Investment NV
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 Mariasal Investment NV filed Critical Mariasal Investment NV
Publication of WO2005079710A1 publication Critical patent/WO2005079710A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—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
    • A61F2/46—Special tools for implanting artificial joints
    • A61F2/4603—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4607—Special tools for implanting artificial joints 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
    • 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
    • A61F2/3662—Femoral 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
    • 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
    • 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
    • A61F2002/30331—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
    • A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
    • 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
    • A61F2002/30906—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth shot- sand- or grit-blasted
    • 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
    • A61F2002/3652—Connections of necks to 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2002/3678—Geometrical features
    • A61F2002/368—Geometrical features with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
    • 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 for implanting artificial joints
    • A61F2/4603—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4625—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use
    • A61F2002/4628—Special tools for implanting artificial joints for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
    • 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 for implanting artificial joints
    • A61F2002/4681—Special tools for implanting artificial joints by applying mechanical shocks, e.g. by hammering
    • 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
    • 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
    • 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
    • A61F2310/00395—Coating or prosthesis-covering structure made of metals or of alloys
    • A61F2310/00407—Coating made of titanium or of Ti-based 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
    • A61F2310/00389—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

Definitions

  • Hip prosthesis stem provided with a gripping member connected to it.
  • the present invention relates to the technical field of the design and production of hip prosthesis stems, in other words of tapered metal members which are inserted into the femur and which are each provided with a cavity into which is inserted the movable neck which supports a spherical head that replaces the head of the femur.
  • the aforementioned stem is implanted in a reliably permanent way into the femur to which it is fitted.
  • this is achieved by means of what is known as the "primary" adhesive effect imparted by the forced joint between the stem and the femur, obtained by forcefully inserting the stem, which as stated has a tapered shape, into the femur.
  • Use is also made of what is known as the "secondary” adhesion, provided by the incorporation of the outer surface of the stem into the layer of bone tissue which is in contact with it and which regenerates after the operation.
  • the said outer surface of the stem is treated, or an additional layer is applied to it, in such a way that the surface directly in contact with the bone has a degree of roughness and/or considerable porosity.
  • the cells of the regenerated bone tissue thus penetrate between the said roughnesses or into the said pores, creating a multiplicity of small protuberances which remain firmly fixed to the stem and thus prevent any movement .
  • the methods used at the present time include the application of hydroxyapatite, or a thin layer of porous titanium, as well as the sanding of the outer surface of the stem.
  • the roughness and/or porosity is extremely shallow, and if an area of the treated surface is touched before the stem is introduced into the femoral cavity, with the application of a layer of grease, blood or physiological tissue, even if this layer is very thin, then the said surface, as will be understood, becomes unable to perform the aforesaid function.
  • Stems produced at the present time are removed from their sterile wrapping during the operation, and their necessary handling, which may be complicated, very frequently gives rise to the problem mentioned above. If pliers or tongs are used to grip a stem in order to avoid this problem, then, because of the tapered shape of the stem, it is necessary to grip the inside of the aforementioned cavity for the insertion of the movable neck, and this gives rise to a risk of causing abrasion, dents or scratches, which, even if extremely small, may compromise the adhesion of the complicated joint between the stem and the movable neck.
  • the inventor of the solution proposed in this application has devised a stem which can be provided in advance with a convenient gripping member connected to it in an easily reversible way, with the aid of suitable connecting means formed on the said stem, before it is enclosed in its sterile wrapping.
  • the stem can thus be removed from its wrapping by gripping the said gripping member, and can be manipulated until it has been fitted into the femur, after which the said gripping member, preferably of the disposable type, can be removed.
  • the said means formed on the stem for connection to the gripping member can be designed in such a way that, on completion of the connection between them, the stem and the gripping member form a single unit, without the possibility of movement and/or rotation with respect to each other.
  • the object of the present invention is therefore a hip prosthesis stem as described in the attached Claim 1.
  • a more detailed description will now be given of a preferred example of embodiment of the stem according to the invention, with additional reference to the attached drawings, in which:
  • FIG. 1 is a side view of the said example of embodiment of a hip prosthesis stem according to the invention with a separate gripping member which is subsequently connected to it;
  • FIG. 2 is a front view of the example of embodiment of Figure 1, showing only a part of the gripping member.
  • FIGS. 1 and 2 show how a hip prosthesis stem 1 according to the invention has the said cavity 2 provided with an opening 2a for the insertion of a movable neck (not shown) .
  • this opening 2a and in particular in the part of the outer surface le of the stem 1 surrounding this cavity 2, there are formed two recesses 10 and 11 parallel and opposite to each other in such a way that a relatively thin ridge 9 is formed between them, and can be clamped between the two jaws 5 and 6 of forceps 3, preferably of plastics material, provided with elastic return means consisting of a simple flexion or torsion spring 4 of a known type.
  • the forceps 3 is shown in solid lines in the situation in which it is kept open by overcoming the opposition of the spring 4: the drawing shows how a projection 7, cylindrical in this case, is formed on the inner surface of the terminal portion 5t of one 5 of the jaws 5, 6, for connection in a complementary way to a cylindrical through hole 8 formed at the base of one of the said two recesses 10 and 11 (namely the recess numbered 10 in the drawing) .
  • the inventor suggests that the said recesses 10 and 11 with the edges 12 ( Figure 2) be shaped so that they house in a complementary way the said terminal portions 5t and 6t of the jaws 5 and 6 of the forceps 3.
  • the profiles of the said terminal portions adhere to the edges of the said recesses 10 and 11, and, for obvious geometrical reasons, cannot rotate in any way with respect to the forceps 3.
  • This method can be used to form a hip prosthesis stem which, being connected reversibly to a gripping member in such a way that it cannot carry out rotational or translatory movements with respect to it, can be manipulated without being touched on its outer surface. In this way the inventor's objective is achieved.
  • the creation of the said recesses in the proximity of the opening of the cavity described above creates connecting edges between the edges and the bases of the said cavities, which, together with the ridge 9, form reliable elements for the application of one of the types intermediate members used to transmit to the stem the kinetic energy of a mallet with which the said stem is forcefully inserted into the femur .

Landscapes

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

Abstract

What is described is a hip prosthesis stem (1), having a cavity (2) for the insertion of a movable neck. The stem (1) is provided with a gripping member (3) and with means (10, 11) for its reversible connection by complementary means (7) to the said gripping member (3), in such a way that the stem (1) can be manipulated without any touching of the outer surface (1e), while being unable to be translated or rotated with respect to the said gripping member (3).

Description

Hip prosthesis stem provided with a gripping member connected to it.
The present invention relates to the technical field of the design and production of hip prosthesis stems, in other words of tapered metal members which are inserted into the femur and which are each provided with a cavity into which is inserted the movable neck which supports a spherical head that replaces the head of the femur.
As is known, the success of an operation for fitting a hip prosthesis depends not only on the correct design of the various components but also on the extent to which each part remains securely fixed without the possibility of rotational and translatory movement or slipping.
In particular, it is very important that the aforementioned stem is implanted in a reliably permanent way into the femur to which it is fitted. At the present time, this is achieved by means of what is known as the "primary" adhesive effect imparted by the forced joint between the stem and the femur, obtained by forcefully inserting the stem, which as stated has a tapered shape, into the femur. Use is also made of what is known as the "secondary" adhesion, provided by the incorporation of the outer surface of the stem into the layer of bone tissue which is in contact with it and which regenerates after the operation. To increase the effectiveness of the aforesaid secondary adhesion, the said outer surface of the stem is treated, or an additional layer is applied to it, in such a way that the surface directly in contact with the bone has a degree of roughness and/or considerable porosity. The cells of the regenerated bone tissue thus penetrate between the said roughnesses or into the said pores, creating a multiplicity of small protuberances which remain firmly fixed to the stem and thus prevent any movement .
The methods used at the present time include the application of hydroxyapatite, or a thin layer of porous titanium, as well as the sanding of the outer surface of the stem.
Whatever type of treatment is used, the roughness and/or porosity is extremely shallow, and if an area of the treated surface is touched before the stem is introduced into the femoral cavity, with the application of a layer of grease, blood or physiological tissue, even if this layer is very thin, then the said surface, as will be understood, becomes unable to perform the aforesaid function.
Stems produced at the present time are removed from their sterile wrapping during the operation, and their necessary handling, which may be complicated, very frequently gives rise to the problem mentioned above. If pliers or tongs are used to grip a stem in order to avoid this problem, then, because of the tapered shape of the stem, it is necessary to grip the inside of the aforementioned cavity for the insertion of the movable neck, and this gives rise to a risk of causing abrasion, dents or scratches, which, even if extremely small, may compromise the adhesion of the complicated joint between the stem and the movable neck.
To overcome all the drawbacks described above, the inventor of the solution proposed in this application has devised a stem which can be provided in advance with a convenient gripping member connected to it in an easily reversible way, with the aid of suitable connecting means formed on the said stem, before it is enclosed in its sterile wrapping. The stem can thus be removed from its wrapping by gripping the said gripping member, and can be manipulated until it has been fitted into the femur, after which the said gripping member, preferably of the disposable type, can be removed.
As described more fully below, the said means formed on the stem for connection to the gripping member can be designed in such a way that, on completion of the connection between them, the stem and the gripping member form a single unit, without the possibility of movement and/or rotation with respect to each other.
The object of the present invention is therefore a hip prosthesis stem as described in the attached Claim 1. A more detailed description will now be given of a preferred example of embodiment of the stem according to the invention, with additional reference to the attached drawings, in which:
- Figure 1 is a side view of the said example of embodiment of a hip prosthesis stem according to the invention with a separate gripping member which is subsequently connected to it; - Figure 2 is a front view of the example of embodiment of Figure 1, showing only a part of the gripping member.
With reference to the aforesaid Figures 1 and 2, these show how a hip prosthesis stem 1 according to the invention has the said cavity 2 provided with an opening 2a for the insertion of a movable neck (not shown) . Near this opening 2a, and in particular in the part of the outer surface le of the stem 1 surrounding this cavity 2, there are formed two recesses 10 and 11 parallel and opposite to each other in such a way that a relatively thin ridge 9 is formed between them, and can be clamped between the two jaws 5 and 6 of forceps 3, preferably of plastics material, provided with elastic return means consisting of a simple flexion or torsion spring 4 of a known type.
It should be noted that, by making the forceps in a suitable way according to known methods, its jaws can be made to bend and act as an opposing spring, without any need to fit an additional member having this function (this case is not shown in the drawings) .
The forceps 3 is shown in solid lines in the situation in which it is kept open by overcoming the opposition of the spring 4: the drawing shows how a projection 7, cylindrical in this case, is formed on the inner surface of the terminal portion 5t of one 5 of the jaws 5, 6, for connection in a complementary way to a cylindrical through hole 8 formed at the base of one of the said two recesses 10 and 11 (namely the recess numbered 10 in the drawing) .
If the forceps 3, opened as described, is advanced in such a way that its two jaws 5 and 6 enclose the said ridge 9, and the action of the spring 4 ceases to be opposed, the forceps 3 closes, and its cylindrical projection 7 penetrates into the complementary recess 8 described above, thus preventing any relative translatory movement between the forceps and the stem 1. (The forceps 3 is shown in broken lines in this connected state.)
To prevent any relative rotation between them, the inventor suggests that the said recesses 10 and 11 with the edges 12 (Figure 2) be shaped so that they house in a complementary way the said terminal portions 5t and 6t of the jaws 5 and 6 of the forceps 3. Thus the profiles of the said terminal portions adhere to the edges of the said recesses 10 and 11, and, for obvious geometrical reasons, cannot rotate in any way with respect to the forceps 3.
This method can be used to form a hip prosthesis stem which, being connected reversibly to a gripping member in such a way that it cannot carry out rotational or translatory movements with respect to it, can be manipulated without being touched on its outer surface. In this way the inventor's objective is achieved.
A further note should be added: the creation of the said recesses in the proximity of the opening of the cavity described above creates connecting edges between the edges and the bases of the said cavities, which, together with the ridge 9, form reliable elements for the application of one of the types intermediate members used to transmit to the stem the kinetic energy of a mallet with which the said stem is forcefully inserted into the femur .

Claims

Claims
1. Hip prosthesis stem (1), having a cavity (2) for the insertion of a movable neck, characterized in that it is provided with a gripping member (3) and with means (10, 11) for its reversible connection by complementary means (7) to the said gripping member (3), in such a way that the stem (1) can be manipulated without any touching of the outer surface (le) , while being unable to be translated or rotated with respect to the said gripping member (3) .
2. Stem according to Claim 1, in which the said gripping member consists of a forceps (3) with elastic return means (4), provided with two jaws (5 and 6), the inner surface of the terminal portion (5t) of at least one of these jaws having at least one recess or a projection (7) which can be connected in a complementary way to at least one projection or recess (8) formed on the outer surface of the stem (1) in the proximity of the opening (2a) of the said cavity (2) .
3. Stem according to Claim 2, in which the said at least one recess (8) or projection of the stem (1) is formed on a ridge (9) having parallel sides enclosed between two parallel and opposite recesses (10, 11) formed in the area of the outer surface (le) of the stem on which the said opening (2a) is located, these recesses being capable of containing on opposite sides the terminal portions (5t and 6t) of the jaws (5 and 6) of the said forceps (4).
4. Stem according to Claim 3, in which the edges (12) of the said two recesses (10 and 11) are shaped so that they house in a complementary way the terminal parts (5t and 6t) of the said jaws (5 and 6) , thus preventing the rotation of these jaws with respect to the stem (1) when this is connected to the said forceps (3)
PCT/IB2005/000068 2004-01-22 2005-01-11 Hip prosthesis stem provided with a gripping membe connected to it Ceased WO2005079710A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00084/04A CH697227B1 (en) 2004-01-22 2004-01-22 Stem hip prosthesis provided with a gripping member connected to it.
CH00084/04 2004-01-22

Publications (1)

Publication Number Publication Date
WO2005079710A1 true WO2005079710A1 (en) 2005-09-01

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PCT/IB2005/000068 Ceased WO2005079710A1 (en) 2004-01-22 2005-01-11 Hip prosthesis stem provided with a gripping membe connected to it

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CH (1) CH697227B1 (en)
WO (1) WO2005079710A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2970170A1 (en) * 2011-01-07 2012-07-13 Tornier Sa Femoral stem for surgical assembly used for hip prosthesis by introducing stem into medullary canal of femur, has notch including plane surface for guiding stem in rotation and curved surface for support during impaction at same time
US12208021B2 (en) 2018-10-04 2025-01-28 Depuy Ireland Unlimited Company Prosthesis extraction system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476466A (en) * 1993-07-20 1995-12-19 Zimmer, Inc. Orthopaedic positioning instrument
FR2721200A1 (en) * 1994-06-17 1995-12-22 Cremascoli France Hip prosthesis with variable articulation
WO1996000539A1 (en) * 1994-06-30 1996-01-11 Howmedica, Inc. Modular femoral trial hip replacement system
US5951564A (en) * 1996-12-18 1999-09-14 Bristol-Myers Squibb Company Orthopaedic positioning apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476466A (en) * 1993-07-20 1995-12-19 Zimmer, Inc. Orthopaedic positioning instrument
FR2721200A1 (en) * 1994-06-17 1995-12-22 Cremascoli France Hip prosthesis with variable articulation
WO1996000539A1 (en) * 1994-06-30 1996-01-11 Howmedica, Inc. Modular femoral trial hip replacement system
US5951564A (en) * 1996-12-18 1999-09-14 Bristol-Myers Squibb Company Orthopaedic positioning apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2970170A1 (en) * 2011-01-07 2012-07-13 Tornier Sa Femoral stem for surgical assembly used for hip prosthesis by introducing stem into medullary canal of femur, has notch including plane surface for guiding stem in rotation and curved surface for support during impaction at same time
US12208021B2 (en) 2018-10-04 2025-01-28 Depuy Ireland Unlimited Company Prosthesis extraction system

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