CA2130141C - Endoprothesis for a shoulder joint - Google Patents

Endoprothesis for a shoulder joint

Info

Publication number
CA2130141C
CA2130141C CA002130141A CA2130141A CA2130141C CA 2130141 C CA2130141 C CA 2130141C CA 002130141 A CA002130141 A CA 002130141A CA 2130141 A CA2130141 A CA 2130141A CA 2130141 C CA2130141 C CA 2130141C
Authority
CA
Canada
Prior art keywords
endoprosthesis
shank
axis
pin
threaded
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.)
Expired - Fee Related
Application number
CA002130141A
Other languages
French (fr)
Other versions
CA2130141A1 (en
Inventor
Herbert F. Resch
Holger Muller
Bernd Robioneck
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.)
Stryker Trauma GmbH
Original Assignee
Howmedica GmbH
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 Howmedica GmbH filed Critical Howmedica GmbH
Publication of CA2130141A1 publication Critical patent/CA2130141A1/en
Application granted granted Critical
Publication of CA2130141C publication Critical patent/CA2130141C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • A61F2/40—Joints for shoulders
    • 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
    • A61F2/28—Bones
    • A61F2002/2835—Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
    • 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
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30125—Rounded shapes, e.g. with rounded corners elliptical or oval
    • 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
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
    • A—HUMAN NECESSITIES
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    • 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
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/3055—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting length
    • 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
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30574—Special structural features of bone or joint prostheses not otherwise provided for with an integral complete or partial collar or flange
    • 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
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30617—Visible markings for adjusting, locating or measuring
    • 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
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30777—Oblong apertures
    • 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
    • A61F2002/3082—Grooves
    • 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
    • A61F2/30767—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
    • A61F2002/30899—Protrusions pierced with apertures
    • A61F2002/30902—Protrusions pierced with apertures laterally or radially
    • 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
    • A61F2/40—Joints for shoulders
    • A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
    • A61F2002/4018—Heads or epiphyseal parts of humerus
    • 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
    • A61F2/40—Joints for shoulders
    • A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
    • A61F2002/4051—Connections of heads directly 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
    • A61F2/40—Joints for shoulders
    • A61F2/4059—Humeral shafts
    • A61F2002/4062—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
    • 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
    • A—HUMAN NECESSITIES
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    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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    • A61F2230/0008—Rounded shapes, e.g. with rounded corners elliptical or oval
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    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
    • A61F2250/0097—Visible markings, e.g. indicia

Abstract

An endoprothesis for a shoulder joint, comprising a head portion including a spherical joint surface and an elongate shank portion which is to be driven into the proximal humerus and which is to be connected to said head portion, wherein the head portion includes a first threaded portion cooperating with a second threaded portion provided at the proximal ending of the shank portion such that the distance between the head portion and the shank portion is adjustable.

Description

~ 1 3 0 ~

An Endoprothesis for a Shoulder Joint - ~

. :. ~ :

The present invention relates to an endoprothesis for a shoulder joint as defined in the preamble of claim 1.
: ~:
An endoprothesis of this type usually includes a tapered plug-in connection between a head portion including a spherical joint surface and the elongate shank portion. The axis of the plug-in connection coincides with the axis of the shank and the center of curvature of the joint surface ;.
is spaced from said axis.
For this structure the distance between the joint surface or, respectively, the center of curvature thereof and the shank portion ~erPn~ on the shape of the head portion and cannot be varied any more after the head portion has been manufactured. In particular, the lateral distance of the humerus from the joint cannot be adjusted. ' ~-..: ....~
It is an object of the present invention to provide an endoprothesis for a shoulder joint that provides for an adjustabLe distance between the head portion and the shank portion.
According to the invention the head portion of the endoprothesis is connected through a threaded connection to ';
the proximal end of the shank portion such that the distance ; ;~
between the head portion and the shank portion can be '~
varied. In ~he operation the head portion is screwed into ' ;~
the shank portion until the desired distance is ob~Ained. -,~
According to an embodiment of the invention, the center of curvature of the joint surface is located on the axis of the first threaded portion. This allows to symmetrically form the head portion which has advantages when being screwed ;-' into the shank portion. ~ ;~
. ~. . ~,;. ~

~,~, .-' '' 2130~41 According to another embodi.~ent of the invention, the axis of the second threaded portion is inclined with respect to the longitudinal axis of the shank portion. This makes it possible to adjust the lateral distance between the joint and the humerus. The angle of inclination is preferably about 50~ to conform to the natural joint.
According to a still further embodiment of the invention the threaded portion is formed as a threaded pin having an outer thread and the second threaded portion is formed as a threaded bore. On the one side this facilitates the handling when the head portion is screwed in and, on the other side, the head portion can be secured against rotation in the shank portion.
In a further embodiment of the invention, the threaded pin includes peripherally spaced longitudinal grooves extending parallel to the axis, said grooves preferably including a rounded transverse profile to secure the pin against a rotation.
According to a further embodiment of the invention, the head portion includes reference markings provided at the edge or -the lower side of the joint surface which markings are aligned to said longitudinal grooves. Thus the surgeon is able to observe the orientation of the longitudinal grooves even when the thread is not visible.
In a further embodiment of the invention, the head portion ;
includes recesses to be engaged for a turning tool to exert higher torque which recesses are located or close to the edge or at the lower side of the joint surface.
Still further, the longitudinal grooves are each of said about 90~, and the respective markings are formed as engaging recesses.
' " ,'','~' ' C~ 1 3 According to a further embodiment of the invention, the second thread is formed in a blind bore so that bony material cannot grow into the bore.
According to a still further embodiment of the invention, a locking screw is turned into a threaded bore transversally extending with respect to the second threaded portion. This - --locking screw can engage a longitudinal groove of the threaded pin to secure the pin against rotation. The locking screw is preferably defined by a pin-type screw, preferably ~;
including a rounded tip and a head formed for being engaged by a turning tool. According to a preferred embodiment of -the invention, the shaft of the locking screw includes a transversally extending plastic insert. The plastic insert ~ ' prevents an accidental release of the rotary lock. -Still further the invention provides for a peen having openings proximally attached to the shank portion for mounting fractured parts of the humerus bone.
According to a further embodiment of the invention, the -shank portion includes a proximal portion having openings, preferably axially extending elongate openings and a smooth distal portion. The shank portion farmost entering the humerus comprises a smooth surface, while the openings in the proximal shank portion facilitate an anchoring by means of bony material growing in.
According to a further embodiment of the invention, the shank portion in close proximity to the proximal end of the threaded portion includes a collar extending vertically with ;
respect thereto, and the shank portion including an oval'' cross section at the height of the distal end of the threaded portion with reference to the longitu~in~l axis of the shank. The joining areas between bone, shank and head may be thus designed to be of appropriate shape.
~"',''. ' ' ,, ,'','''''''.-"'',''''.
: ' '' ".: .
::: ., :

;- '21301~ -In a further embodiment of the invention, the head portion, the shank portion and/or the locking screw are made of metal, preferably titan or a cobalt-chrome alloy.
Embodiments of the present invention are now being described with reference to the accompanying drawings.
Fig. 1 shows a side view, partly in section, of an endoprothesis for a shoulder joint according to the invention.
:: .
Fig. 2 shows a side view of the head portion of the endoprothesis of Fig. 1.

Fig. 3 shows a top view of the head portion according to -~-~
Fig. 2 from the distal end.

Fig. 4 shows a side view, partly in section, of a shank ~ -portion according to the invention.
Fig. 5 shows a front view of the shank portion of Fig. 4. ~ ;
~.~,: ~,.'', Fig. 6 shows a cross-sectional view of the shank portion -of Fig. 4 taken along line A-A.
With reference to Fig. 1, the endoprothesis for a shoulder joint comprises a head portion 10 which is screwed into a shank portion 12 and which is secured by a locking screw 14.
The head portion 10 formed as a rotational head may cooperate with an artificial ~oint socket (not shown) of a natural shoulder bone (likewese not shown) to define a shoulder joint.
The head portion 10 includes a spherically shaped joint ' surface 16 and a threaded pin 18 including an outer thread 20. The joint surface 15 is approximately semispherically shaped with the center of curvature being located on the -acis 22 of the threaded pin. The joint surface t~ inAtes in 2130~ ~
.
an edge 24. As Fig. 2 and 3 s;now in some detail the outer side 20 of the threaded pin 18 extends up to a recess 26 provided at the free end of the pin.
The threaded pin 18 includes four peripherally spaced longitu~in~l grooves extending parallel to the axis and having a rounded profile. Four markings 30 shaped as engaging recesses are provided along the edge 24 of the joint surface 16, which markers are aligned with longitudinal grooves 28 of the threaded pin 18.
The proximal end of the shank portion 12 includes a threaded portion 32 comprising a bore 32 including an internal thread cooperating with the outer thread 20 along the thread axis 22. The axis 22 is inclined at an angle with respect to the -~
longitudinal axis 38 of the shank portion. The proximal end of the shank 12 further includes a threaded bore 40 -~ ' extending vertical with respect to the axis 22 for receiving ;~
a locking screw 14, said shank further comprising a peripheral collar 42 likewise extending vertically with respect to the axis 22. Still further a peen 44 having three openings 46 is provided close to the proximal end of the shank.
The shank 12 has a proximal portion 48 including axially ~- ;
elongate openings 50 and a smooth distal portion 52.
.. ,,~,-, ,,,.. ,, ~".
The locking screw 14 is a pin-type screw including an outer thread 54 and a head 56 to be shaped for being engaged by a ' turning tool, as well as a rounded tip 58. The pin-type screw further includes a bore 60 housing a plastic plaque. ~ , Figs. 4 to 6 show an alternative embodiment of the endoprothesis according to the invention in further details. ~, The threaded bore 34' cooperating with the threaded pin of ~ -the head portion as shaped as a blind bore. All the L~ ~ining features shown correspond to the ~o~ t described with reference to Fig. 1. ~ -' ' -' ":'-' ": , ~', ;.; ~; ;.: ~.

q '21'301~1 The concentrical shape ot the collar 42 with respect to the axis 22 is clearly visible. Fig. 6 shows the oval cross section of the shank with respect to the axis 38 in a section A-A in the height of the distal end of the threaded portion 32.
In operation, the shank portion with the smooth distal portion 52 being directed forwardly is driven into the humerus. The head portion 10 is guided along the axis 22 towards the shank portion 12, and is screwed with the threaded pin 18 into the threaded bore 34 until the desired - ;
distance between the joint surface 16 and the shank portion 12 with respect to its axis 38, for example, is obtained.
The next mark or, respectively engaging recess 30 will be aligned to the bore 40 and the locking screw 14 including the plastic insert is fixed in the threaded bore 40. The pin-type screw 14 is tightened until its rounded tip 58 engages the longitudinal groove 28 of the threaded pin 18.
The head 10 is now being locked against a rotary motion about the axis 22, while the plastic insert of the screw prevents a lo~sPning. Now the endoprothesis including the joint surface 16 may be inserted in the bone (not shown) and fractured parts, if any, may be secured to the peen 44.
After inserting the prothesis free of cement bony material will grow into the elongate openings 50 of the proximal shank portion 48.

Claims (11)

1. An endoprosthesis for a shoulder joint, comprising an elongate shank portion adapted to be driven into the proximal humerus and having a distal end and a proximal end portion, said proximal end portion being inclined with respect to the axis of said shank portion and having a blind bore coaxial or parallel with respect to the axis of said inclined end portion and being provided with an internal thread, a separate head portion having a spherical joint surface and a pin portion opposite to said joint surface, said pin portion having an external thread and being adapted to be threaded into said threaded blind bore, said pin portion further having peripherally spaced grooves extending parallel to the axis of said pin portions, said proximal portion having a transverse threaded bore which accommodates a threaded locking pin adapted to engage one of said grooves to secure said pin portion against rotation.
2. The endoprosthesis of claim 1, wherein said axis of said proximal portion is inclined with respect to the axis of said shank portion at an angle of approximately 50°.
3. The endoprosthesis of claim 1, wherein said longitudinal grooves have a rounded cross-sectional profile.
4. The endoprosthesis of claim 1, wherein said head portion includes reference marks which are provided at or close to the edge or at the lower side of said joint surface, said reference marks being aligned to said longitudinal grooves.
5. The endoprosthesis of claim 1, wherein said head portion includes recesses for the engagement by a turning tool, said recesses being provided at or close to the edge or at the lower side of said joint surface.
6. The endoprosthesis of claim 1, wherein four longitudinal grooves are provided peripherally spaced at 90°.
7. The endoprosthesis of claim 1, wherein said locking pin includes a rounded tip.
8. The endoprosthesis of claim 1, wherein said locking pin includes a head which is adapted to be engaged by a turning tool.
9. The endoprosthesis of claim 1, wherein the shank of said locking pin includes a transversally extending plastic insert.
10. The endoprosthesis of claim 1, wherein said head portion, said shank portion and/or said locking pin is formed of metal.
11. The endoprosthesis of claim 10, wherein said shank portion and/or said locking pin is formed of titan or a cobalt chrome alloy.
CA002130141A 1993-08-16 1994-08-15 Endoprothesis for a shoulder joint Expired - Fee Related CA2130141C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEG9312218.7 1993-08-16
DE9312218U DE9312218U1 (en) 1993-08-16 1993-08-16 Endoprosthesis for the shoulder joint

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CA2130141A1 CA2130141A1 (en) 1995-02-17
CA2130141C true CA2130141C (en) 1998-06-16

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EP (1) EP0639359B1 (en)
JP (1) JPH07148188A (en)
AT (1) ATE177617T1 (en)
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DE (2) DE9312218U1 (en)

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Also Published As

Publication number Publication date
CA2130141A1 (en) 1995-02-17
US5658340A (en) 1997-08-19
JPH07148188A (en) 1995-06-13
EP0639359B1 (en) 1999-03-17
DE69417120T2 (en) 1999-07-01
EP0639359A1 (en) 1995-02-22
DE69417120D1 (en) 1999-04-22
DE9312218U1 (en) 1993-10-21
ATE177617T1 (en) 1999-04-15

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