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US 12,029,437 B1Granted
Hand piece for powered osteotome
AssigneeHenry Schein, Inc.
InventorsBrian David Parlato, Alfred Anthony Litwak
Life of this patent
Estimating the term…
Abstract
Provided is an osteotome handpiece that may be driven by compressed gas. In an embodiment, a spherical piston may be movable inside a cylinder having a liner, which may be made of a low-friction material such as a fluoropolymer. The spherical piston may impact a blade holder that transmits force to a blade. A piston return spring may be provided, along with a piston washer to avoid any possible outward deformation of the spring. The blade holder may be retained by a split and threaded retaining collar. Single-stroke or multi-stroke operation may be chosen by the user. The device has long-operating low-maintenance advantages.
Claims18
An osteotome, comprising:
- a blade suitable to cut materials during surgery;
- and
- a drive mechanism that either is configured to transmit a force to a force-transmitting component that transmits force to said blade, or is configured to transmit force directly to said blade,
- wherein said drive mechanism comprises a cylinder having a cylinder liner, said cylinder liner being made of or comprising a cylinder liner material, and wherein said drive mechanism further comprises a spherical piston, said spherical piston being movable within said cylinder liner, said spherical piston being made of or comprising a piston material,
- wherein a coefficient of sliding friction of said cylinder liner material with said piston material is less than 0.20, or a coefficient of sliding friction of said cylinder liner material with itself is less than 0.20, and
- wherein said cylinder liner has an internal surface having a surface roughness of 125 microinches rms or smoother and said spherical piston has a surface roughness of between 5 and 20 microinches rms.
3 more elements
An osteotome, comprising:
- a blade suitable to cut materials during surgery;
- a drive mechanism that either is configured to transmit a force to a force-transmitting component that transmits force to said blade, or is configured to transmit force directly to said blade,
- wherein said drive mechanism comprises a cylinder,
- wherein said drive mechanism further comprises a spherical piston, said spherical piston being movable within said cylinder,
- wherein said drive mechanism further comprises a piston return spring located within said cylinder,
- wherein said drive mechanism further comprises a piston washer, said piston washer being located within said cylinder between said spherical piston and said piston return spring,
- wherein said piston washer has a concave surface facing said spherical piston,
- wherein said piston washer has a central opening therethrough;
- wherein said piston washer comprises a head region and a neck region, said head region being larger in transverse dimension than said neck region, said head region facing said spherical piston, said neck region being suitable to occupy space inside a coil of said piston return spring;
- and
- wherein said neck region has an outside diameter that is greater than an inside diameter of said coil of said piston return spring in an undeformed condition, but can fit inside said coil of said piston return spring when said coil is deformed radially outward, wherein said coil in said radially-outward-deformed condition still has a smaller outside diameter than an outside diameter of said head region.
8 more elements
An osteotome, comprising:
- a blade suitable to cut materials during surgery;
- and
- a drive mechanism that is configured to transmit a force to a force-transmitting component that transmits force to a blade,
- wherein said drive mechanism comprises a first cylinder and a first piston movable with respect to said first cylinder,
- wherein said osteotome further comprises a second cylinder that is connected to and in a defined spatial relationship with said first cylinder, and said force-transmitting component comprises a second piston that is disposed to be able to receive impact force from said first piston, said second piston further extending to a narrower region and thence to a chuck, said chuck being suitable to grip said blade, said narrower region being narrower than said second piston,
- wherein said narrower region is retained within said osteotome by a retaining collar that is threaded with an external helical thread,
- wherein said retaining collar has a central hole therethrough having a central hole diameter that is smaller than a diameter of said second piston,
- wherein said retaining collar comprises two parts each of which makes up approximately half of a circumference of said retaining collar and contains a portion of said external helical thread, wherein said two parts in combination form said external helical thread.
5 more elements
Dependencies are inferred from the claim text.