Surgical instrument
Inventors
Bowman, Steven Mark • Kennedy, III, James J. • Frick, Sean M. • Trainer, Glenn Kenneth • Taylor, Jon B. • Callaghan, David J.
Assignees
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Publication Number
US-10357259-B2
Publication Date
2019-07-23
Expiration Date
Abstract
A cannulated retrograde reamer that is adjustable to create tunnels of multiple different diameters. The cannulated retrograde reamer substantially reduces the risk of tunnel malposition and/or misalignment, and can be adjusted to create a range of tunnel diameters, thereby allowing inventory levels to be reduced for a surgical case.
Core Innovation
A cannulated retrograde reamer is configured for surgical procedures, including ACL reconstruction, to drill a tunnel through bone. The reamer includes a first tubular shaft with a distal opening and a plurality of cutting edges circumferentially disposed around the opening, and at least one second shaft that is removeably insertable within the first tubular shaft such that a distal end of the second shaft is extendable through the opening.
A cutting member is moveably coupled to the second shaft and is adapted to be displaced from a collapsed position to at least one deployed position, thereby defining at least one cutting diameter. The cutting member comprises a first cutting member portion spaced from a second cutting member portion along a longitudinal axis, and a flex member formed separately from the first and second cutting member portions.
The first and second cutting member portions are disposed on the flex member such that at least a portion of the flex member extends between the cutting member portions. The portion of the flex member extending between the cutting member portions is configured to move through an opening in a sidewall of the first tubular shaft when the cutting member is in the deployed position, with displacement occurring in response to relative movement of the first tubular shaft and the second shaft.
Additional disclosed features include multiple alternative cutter-deployment configurations, multiple tunnel diameters including stepped or tapered options, guide-wire accommodation, suction, and diameter indication/locking, including ratchet-locking and diameter indication/measurement approaches.
Claims Coverage
The partial content provides two independent claims. Across these claims, the main inventive features are centered on a cannulated retrograde reamer with a first tubular shaft having an opening and circumferential cutting edges, a removeably insertable second shaft, and a flex-member cutting member that deploys from a collapsed position to a deployed position through a sidewall opening in response to relative movement, thereby defining a cutting diameter.
Axial/collapsed-to-deployed flex-member cutting member through a sidewall opening defining a cutting diameter
A first tubular shaft includes a distal opening with circumferential cutting edges, and at least one second shaft removeably insertable within the first tubular shaft so a distal end of the second shaft is extendable through the opening. At least one cutting member includes first and second cutting member portions spaced along a longitudinal axis, a flex member formed separately from the first and second cutting member portions, and a moveably coupled relationship to the second shaft. In response to relative movement of the first tubular shaft and the second shaft, the cutting member is adapted to be displaced from a collapsed position to at least one deployed position to define at least one cutting diameter, with a portion of the flex member extending between the cutting member portions configured to move through an opening in a sidewall of the first tubular shaft when deployed.
Axial movement enabling deployed passage of cutting portions through the sidewall opening
In response to axial movement of the second shaft toward the distal end of the first tubular shaft, a flex member allows first and second cutting member portions to be displaced from the collapsed position to the deployed position. The first and second cutting member portions pass at least partially through the sidewall opening of the first tubular shaft while being displaced to the deployed position.
Together, the independent claims require a cannulated retrograde reamer in which a flex-member cutting member coupled to a second shaft deploys from a collapsed position to a deployed position in response to relative movement, where deployment includes movement of cutting portions through a sidewall opening of a first tubular shaft and thereby defines at least one cutting diameter.
Stated Advantages
Defines at least one cutting diameter by displacing the cutting member from a collapsed position to at least one deployed position.
Allows passage of cutting member portions through a sidewall opening of the first tubular shaft when deployed.
Provides multiple tunnel diameters, including stepped or tapered options.
Enables guide-wire accommodation, suction, and diameter indication/locking, including ratchet-locking and diameter indication/measurement approaches.
Documented Applications
ACL reconstruction, including drilling a femoral ACL tunnel through bone using the cannulated retrograde reamer.
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