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US 4,621,627 AGranted
External axial fixation device
AssigneeOrthofix S.r.l.
InventorsGiovanni DeBastiani, Giovanni Faccioli, Roberto Aldegheri, Lodovico R. Brivio
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AssigneeOrthofix S.r.l.
InventorsGiovanni DeBastiani, Giovanni Faccioli, Roberto Aldegheri, Lodovico R. Brivio
Estimating the term…
The invention contemplates an orthopedic axial-fixation device wherein an extended range of body-length adjustment is achieved using three mutually telescoping members which are keyed against relative rotation, thereby preserving the selectively clamped orientation of pin mounts having ball-joint connection to the ends of the body. Separate selective clamping is available for securing a given extended relation of inner and intermediate body members and for securing a given extended relation of the intermediate and outer body members. Jacking mechanism for precision length adjustment of the body also uses three mutually telescoping threaded members so configurated that rotation of one of these threaded members is operative to provide jack expansion or retraction which serves the fullest possible range of body-length adjustability.
Orthopedic external fixation apparatus, comprising an elongate extendable central body comprised of inner, intermediate and outer telescopically related parts adapted to be concentrically guided and mutually displaceable along the longitudinal axis of said body and retained against relative rotation of said parts, a first pin mount connected via a ball joint to the outer part at one end of said body, a second pin mount connected via a ball joint to the inner part at the other end of said body, the centers of said ball joints being substantially on said axis, first selectively operable means for locking a given longitudinally telescoped relation of said inner and intermediate parts, second selectively operable means for locking a given longitudinally telescoped relation of said intermediate and outer parts, selectively operable means associated with each ball joint for locking a given orientation of the involved pin mount with respect to said body, and selectively operable jack mechanism operative between said inner and outer parts for controlled length adjustment of said body, said jack mechanism comprising inner, intermediate and outer elongate members concentrically related on a common elongation axis, a first threaded engagement between said inner and intermediate members and a second threaded engagement between said intermediate and outer members.
In orthopedic external-fixation apparatus wherein an elongate extendable central body has inner and outer telescopically related parts adapted to be concentrically guided and relatively displaceable along the longitudinal axis of said body and retained against relative rotation of said parts, and wherein first and second pin mounts are ball-joint connected and releasably clamped to the respective ends of said body with ball-joint centers substantially on said axis, the improvement wherein an elongate sleeve concentric with said axis and radially interposed between and telescopically related to both said inner and outer parts is the means of concentric guidance of said inner and outer parts, a first selectively operable keying clamp coacting between said sleeve and said inner part for setting a selected longitudinal relation between said sleeve and said inner part, a second selectively operable keying clamp coacting between said sleeve and said outer part for setting a selected longitudinal relation between said sleeve and said outer part, the keying action of said clamps being the means of retention against relative rotation of said parts, and selectively operable jack mechanism operative between said inner and outer parts for controlled length adjustment of said body, said jack mechanism comprising inner, intermediate and outer elongate members concentrically related on a common elongation axis, a first threaded engagement between said inner and intermediate members and a second threaded engagement between said intermediate and outer members.
Orthopedic external-fixation apparatus, comprising an elongate extendable central body comprised of inner, intermediate and outer telescopically related parts adapted to be concentrically guided and mutually displaceable along the longitudinal axis of said body, means coacting between said telescopically related parts for retaining the same against relative rotation, a first pin mount connected via a ball joint to the outer part at one end of said body, a first ball-joint clamp at said one end of said body and including a rotatable clamp actuator on an axis normal to the longitudinal axis of said body, a second pin mount connected via a ball joint to the inner part at the other end of said body, a second ball-joint clamp at said other end of said body and including a rotatable clamp actuator on an axis normal to the longitudinal axis of said body and parallel to the rotatable clamp actuator for said first ball joint, and selectively operable jack mechanism including inner, intermediate and outer members having mutually telescoping threaded engagement, said jack mechanism being removably engageable at one end of its inner member to one end of said rotatable clamp actuators and being removably engageable at the opposite end of its outer member to the other of said rotatable clamp actuators.
Orthopedic external fixation apparatus, comprising an elongate extendable central body comprised of at least three telescopically related parts wherein said parts are adapted to be concentrically guided and mutually displaceable along the longitudinal axis of said body and retained against relative rotation of said parts, and wherein at least one of said parts is intermediate an inner part and an outer part, a first pin mount connected via a ball joint to the outer part at one end of said body, a second pin mount connected via a ball joint to the inner part of the other end of said body, the centers of said ball joints being substantially on said axis, first selectively operable means for locking a given longitudinally telescoped inner-to-intermediate part relation, second selectively operable means for locking a given longitudinally telescoped outer-to-intermediate part relation, selectively operable means associated with each ball joint for locking a given orientation of the involved pin mount with respect to said body, and selectively operable jack mechanism operative between said inner and outer parts for controlled length adjustment of said body, said jack mechanism comprising inner, intermediate and outer elongate members concentrically related on a common elongation axis, a first threaded engagement between said inner and intermediate members and a second threaded engagement between said intermediate and outer members.
Orthopedic external fixation apparatus, comprising an elongate extendable central body comprised of at least three telescopically related parts wherein said parts are adapted to be concentrically guided and mutually displaceable along the longitudinal axis of said body and retained against relative rotation of said parts, and wherein at least one of said parts is intermediate an inner part and an outer part, whereby coacting inner and outer concentric guide surfaces characterize the relation of each pair of radially adjacent telescoping parts, a first pin mount connected via a ball joint to the outer part at one end of said body, a second pin mount connected via a ball joint to the inner part at the other end of said body, the centers of said ball joints being substantially on said axis, separate selectively operable means for locking a given longitudinally telescoped relation of each pair of radially adjacent parts, selectively operable means associated with each ball joint for locking a given orientation of the involved pin mount with respect to said body, and selectively operable jack mechanism operative between said inner and outer parts for controlled length adjustment of said body, said jack mechanism comprising inner, intermediate and outer elongate members concentrically related on a common elongation axis, a first threaded engagement between said inner and intermediate members and a second threaded engagement between said intermediate and outer members.
Dependencies are inferred from the claim text.