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Publication Number
US-11246606-B2
Publication Date
2022-02-15
Expiration Date
Abstract
Drill bits for cutting bones adjacent to soft tissue are disclosed. According to one example, the drill bit includes a working portion having a top cutting surface including a first top cutting surface and a second top cutting surface. The second stop cutting surface has an angle with respect to a line perpendicular to the longitudinal axis of the drill bit that is less than an angle with respect to a line perpendicular to the longitudinal axis of the drill bit of the first top cutting surface.
Core Innovation
A surgical drill bit is disclosed for cutting a hole in bone using a working portion adjacent a mounting portion configured to mount to a tool. The working portion includes a body portion extending from a distal end to a proximal end, with a top surface and a side surface, and a blocker formed at the proximal end of the body portion having a first diameter greater than a maximum diameter of the body portion.
At least one channel formed in a longitudinal direction extends from the top surface through the blocker. The at least one channel defines, along the body portion, a cutting blade portion configured to cut the bone upon rotation of the surgical drill bit.
The cutting blade portion includes a first top cutting surface having a first angle relative to a longitudinal axis of the body portion and a second top cutting surface having a second angle relative to the longitudinal axis, where the second angle is less than the first angle. In additional configurations, the second angle is greater than 10 degrees with respect to a line perpendicular to the longitudinal axis, and an axial height of the first top cutting surface is equal to or less than an axial height of the second top cutting surface.
Claims Coverage
The document includes three independent claims. Each independent claim centers on a surgical drill bit with a mounting portion and a working portion for cutting a hole in bone, where at least one longitudinal channel defines a cutting blade portion with first and second top cutting surfaces having different angles relative to the longitudinal axis, with additional constraints on blocker/channel arrangement and angle or axial-height relationships.
Cutting blade portion formed by channel and blocker
A surgical drill bit with a mounting portion configured to mount to a tool and a working portion configured for cutting a hole in bone. A blocker at the proximal end has a first diameter greater than a maximum diameter of the body portion, and at least one longitudinal channel extends from the top surface through the blocker. The channel defines a cutting blade portion configured to cut bone upon rotation, with first and second top cutting surfaces having different angles relative to a longitudinal axis, where the second angle is less than the first angle.
Second top cutting surface referenced to a perpendicular line
A surgical drill bit with a mounting portion configured to mount to a tool and a working portion configured for cutting a hole in bone. A body portion includes a top surface and a side surface, and at least one longitudinal channel extends through the body portion to define a cutting blade portion. The cutting blade portion includes a first top cutting surface having a first angle relative to the longitudinal axis and a second top cutting surface having a second angle relative to the longitudinal axis, where the second angle is greater than 10 degrees with respect to a line perpendicular to the longitudinal axis and is less than the first angle.
Axial height relationship between first and second top cutting surfaces
A surgical drill bit with a mounting portion configured to mount to a tool and a working portion configured for cutting a hole in bone. A body portion includes a top surface and a side surface, and at least one longitudinal channel extends through the body portion to define a cutting blade portion. The cutting blade portion includes a first top cutting surface having a first angle relative to the longitudinal axis and a second top cutting surface having a second angle relative to the longitudinal axis, where the second angle is less than the first angle and an axial height of the first top cutting surface is equal to or less than an axial height of the second top cutting surface.
Across the independent claims, the main inventive concept is a surgical drill bit whose channel-defined cutting blade portion includes first and second top cutting surfaces with a second angle less than a first angle relative to the longitudinal axis. Claim variations additionally define the channel through a blocker, impose that the second angle is greater than 10 degrees relative to a perpendicular reference, and require an axial-height relationship between the first and second top cutting surfaces.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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