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US 10,702,325 B2Granted
Plastics implant revision and removal system
AssigneeRadley Scientific Limited
InventorMichael John Radley Young
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AssigneeRadley Scientific Limited
InventorMichael John Radley Young
Estimating the term…
A fracture in a hollow bone is supported temporarily by a rigid plastics implant formed within a balloon within the bone. To assist implant removal, an access port, comprising a hollow cylinder, is inserted through an aperture made in an end of the bone and surrounds a proximal end of the implant. The access port is connected to a source of torsional-mode ultrasonic vibrations to soften the plastic implant and improve engagement between access port and implant. Removal of the ultrasound source allows introduction of a cutting tool through the access port, which guides it to hollow out the implant. The implant then collapses within the balloon and is withdrawn through the access port. One suitable cutting tool has a head with four helical fins separated by part-circular grooves and a concave distal face. Ultrasonically activated, the fin tips soften and cut the plastic, which flows away along the grooves.
Apparatus for removal or revision of an internal plastics implant extending longitudinally within an elongate bone cavity of a hollow bone, comprising an operative head for an ultrasonically-vibratable surgical tool, said operative head comprising an elongate body of substantially cylindrical symmetry, having a proximal end and a distal end, said elongate body comprising at least three elongate, radially-outstanding helically-extending fins, each fin extending between said proximal and distal ends of the elongate body wherein said fins taper in width, being broader adjacent the proximal end of the elongated body than adjacent the distal end of the elongated body, and a corresponding number of helically-extending grooves also extending between said proximal and distal ends, each said fin being defined between a neighboring pair of said grooves, and said operative head further comprising a distal face, said distal face being concave.
Apparatus for removal or revision of an internal plastics implant extending longitudinally within an elongate bone cavity within a hollow bone, comprising an access port device and a tool for inserting said access port device into the bone, wherein said tool comprises a source of ultrasonic vibrations, said ultrasonic vibrations comprising torsional-mode ultrasonic vibrations, wherein the torsional-mode ultrasonic vibrations inhibit a distal extensional drilling effect on the internal plastics implant and elongate bone cavity, and wherein said access port device comprises a hollow cylindrical body extending between an open proximal end and an open distal end, the hollow cylindrical body comprising adjacent its proximal end a mounting adapted to mount the access device detachably to said source of ultrasonic vibrations, and wherein a distal portion of said hollow cylindrical body is insertable through an aperture formed in a wall of the hollow bone into said elongate bone cavity so that said distal portion surrounds a proximal portion of the internal plastics implant, with a longitudinal axis of the hollow cylindrical body being substantially coaxially aligned with a longitudinal axis of the internal plastics implant.
Apparatus for removal or revision of an internal plastics implant extending longitudinally within an elongate bone cavity of a hollow bone, comprising an operative head for an ultrasonically-vibratable surgical tool, said operative head comprising:
Dependencies are inferred from the claim text.