Biopsy device arming mechanism

Inventors

Swick, Zachary Stephen • Friedman, Rosario • Haarala, Brett • Sauvageau, David • Torres, Donna Schulz

Assignees

Hologic Inc

Abstract

A biopsy device for percutaneous tissue removal includes an elongated housing having an operational axis, a stylet hub slidably mounted in the housing, where the stylet hub is movable relative to the housing between a proximal, armed position, and a distal, fired position, the stylet hub having a stylet strike, a cannula hub slidably mounted in the housing alongside the stylet hub, and a spring-biased arming member. The cannula hub is movable relative to the housing between a proximal, armed position, and a distal, fired position. The arming member is moveably mounted to the housing proximal of the respective stylet and cannula hubs, and configured for manually-actuated movement from a relaxed, extended position to a loaded, compressed position to define a compressive arming stroke. The biopsy device also includes an arming member biasing spring that restores the arming member from the compressed position to the extended position.

Core Innovation

The invention describes a hand-held biopsy device with an elongated housing having an operational axis. The distal portion of the housing includes a first deflectable wall portion and a second deflectable wall portion that are integrally formed with the distal portion to form exterior surfaces of the device. A stylet hub is slidably mounted in the distal portion and is movable along the operational axis between a proximal, armed position and a distal, fired position. A cannula hub is also slidably mounted in the distal portion alongside the stylet hub and is movable between a proximal, armed position and a distal, fired position.

The device uses a first control button coupled to the first deflectable wall portion and a second control button coupled to the second deflectable wall portion, where the second control button overlaps at least a portion of the first and second deflectable wall portions. When the stylet hub is in the proximal, armed position, deflection of the first deflectable wall portion propels the stylet hub to the distal, fired position. When the cannula hub is in the proximal, armed position, deflection of the second deflectable wall portion propels the cannula hub to the distal, fired position. This establishes a deflection-to-propulsion relationship tied to the hubs’ respective armed positions.

Additional disclosed embodiments further include a spring-biased arming member that provides a compressive arming stroke from a relaxed, extended position to a loaded, compressed position, with spring restoration between strokes. The disclosure also describes interactions using wedge/ramp and catch interactions to sequentially arm the outer cannula and the inner stylet. Other embodiments indicate independently firing smaller/adjacent firing buttons and include design features intended to reduce actuation noise using non-perpendicular impact surfaces, together with energy-absorbing materials and flexible ribs.

The disclosure additionally describes features including aperture orientation control, axial needle concentricity, non-protruding arming surfaces for patient comfort, and distal needle support inserts/spacers.

Claims Coverage

The independent claim covers a hand-held biopsy device with integrally formed deflectable wall portions and corresponding control buttons that propel a stylet hub and a cannula hub from proximal armed positions to distal fired positions. The identified dependent claims add spring-biased arming and catch release behavior, sequential actuation, overlap spacing constraints, and a proximal end surface retention feature.

The core inventive coverage centers on a hand-held biopsy device in which integrally formed deflectable wall portions and overlapped control buttons propel a stylet hub and a cannula hub from proximal armed positions to distal fired positions, with dependent refinements for spring-biased compressive arming, catch-release with spring propulsion, sequential actuation, overlap spacing, and single-hand palm retention.

Stated Advantages

Documented Applications

No documented applications found