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AssigneeTecres S.P.A.
InventorsGiovanni Faccioli, Renzo Soffiatti, Maurizio Petrolati, Giorgio Delaria, Gianrico Abbiati
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A metacarpal-phalangeal and/or interphalangeal (1) prosthesis, particularly for joints in the hand or foot, comprising a pair of pins (2, 3) which can be implanted in bone adjacent to a joint to be restored and connected by a flexible joint (4) encapsulated in a protective enclosure formed from the same biocompatible material as the pins. The biocompatible material may be a mixture of plastic resins having high compatibility. The enclosure comprises a pair of half shells (5, 6)integral with the corresponding pins which extend axially on opposite side of a longitudinal plane of symmetry (S) which perpendicularly intersects the axis of rotation (a) of the joint. In a first embodiment, axis (a) is defined by a cylindrical pin (13) inserted in the axial cavity in the half shells and free to rotate with respect to at least one axis with limited flexibility in a plane perpendicular to the axis of rotation (a). In a second embodiment the pin (13) is replaced by a cylindrical (13') or hemispherical (13") extension of one of the pins. Axis (a) may be defined by a helicoidal spring (14, 17) or by axial elastic wires (23, 24) anchored in the pins with transverse end plates (25, 26).
A metacarpal-phalangeal or interphalangeal prosthesis, particularly for joints in the hand or foot, comprising two pins (2, 3) which can be inserted into bone adjacent to a joint to be restored, and a flexible joint (4) or coupling designed to join said pins to each other, said pins (2, 3) being constructed of a material which is biocompatible with the surrounding tissue, said joint (4) being substantially completely encapsulated in a protective enclosure, characterized in that said enclosure is formed of the same basic material as the pins (2, 3) and comprises a pair of opposing half shells (5, 6) integral with the corresponding pins (2, 3).
Dependencies are inferred from the claim text.