Orthopedic locking screw for an orthopedic fastening system
AssigneeStryker European Holdings I, LLC
InventorsManfred Wieland, Nils Zander
Life of this patent
Estimating the term…
Abstract
An orthopedic locking screw is configured to be retained inside a bore of an orthopedic implant. The orthopedic locking screw includes a shaft extending axially, a casing secured around an outer surface of the shaft, a deformable thread disposed along an outer surface of the casing, and a forward external thread disposed on the shaft. The forward external thread has a pitch that is different from a pitch of the deformable thread of the casing. Further, an orthopedic locking screw is provided, wherein projections and the casing are alternately arranged on the outer surface of the shaft.
Claims20
An orthopedic locking screw configured to be secured through a bore, provided with an engagement feature, of an orthopedic implant, the orthopedic locking screw comprising:
- a shaft extending along an axis between a first end and a second end;
- a casing having a first end proximate the first end of the shaft and a second end proximate the second end of the shaft, the casing secured to an outer surface of the shaft such that during securing of the orthopedic locking screw through the bore of the orthopedic implant the casing is rotationally and axially fixed around the outer surface of the shaft and prevented from slipping radially relative thereto;
- a deformable thread disposed along an outer surface of the casing configured to deform when the deformable thread engages the engagement feature as the orthopedic locking screw is secured through the bore of the orthopedic implant;
- and
- a forward external thread disposed on the shaft between the first end of the casing and the first end of the shaft,
- wherein the forward external thread has a pitch that is different from a pitch of the deformable thread of the casing.
An orthopedic fastening system, comprising:
- an orthopedic implant comprising a threaded bore;
- and
- an orthopedic locking screw configured to be restrained inside the threaded bore, the orthopedic locking screw comprising:
- a shaft extending along an axis between a first end and a second end, the first end sized to be received in the threaded bore;
- a casing having a first end proximate the first end of the shaft and a second end proximate the second end of the shaft, the casing secured to an outer surface of the shaft such that during securing the orthopedic locking screw through the threaded bore of the orthopedic implant the casing is rotationally and axially fixed around the outer surface of the shaft and prevented from slipping radially relative thereto;
- a deformable thread disposed along an outer surface of the casing, wherein the deformable thread is configured to deform when engaged with a complementary internal thread feature of the threaded bore as the orthopedic locking screw is screwed through the threaded bore of the orthopedic implant;
- and
- a forward external thread disposed on the shaft between the first end of the casing and the first end of the shaft, wherein the forward external thread has a pitch that is different from a pitch of the deformable thread of the casing.
An orthopedic locking screw configured to be secured through a bore, provided with an engagement feature, of an orthopedic implant, the orthopedic locking screw comprising:
- a shaft having projections disposed on an outer surface of the shaft;
- and
- a casing secured to the outer surface of the shaft such that during securing the orthopedic locking screw through the bore of the orthopedic implant the casing is rotationally and axially fixed around the outer surface of the shaft and prevented from slipping radially relative thereto, wherein the casing is formed of a deformable material configured to deform when engaged with the engagement feature as the orthopedic locking screw is secured through the bore of the orthopedic implant,
- wherein the projections and the casing are alternately arranged on the outer surface of the shaft, such that the projections and the casing together form a thread-like feature along the shaft.
Dependencies are inferred from the claim text.