Vacuum assisted biopsy needle set
Inventors
Mark, Joseph L. • Miller, Michael E. • Hoffa, Michael • Nicoson, Zachary R. • Hardin, Terry D. • Jarial, Inderjeet S. • Hodge, William O.
Assignees
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Publication Number
US-8357103-B2
Publication Date
2013-01-22
Expiration Date
Abstract
A biopsy device having a cutting element is disclosed. The cutting element includes an inner cannula having a tissue receiving aperture disposed proximate a distal end thereof and an inner lumen. The inner cannula is slidably disposed within the inner lumen of an outer cannula. A vacuum chamber is disposed about at least a portion of the cutting element and is configured to create a vacuum in the cutting element during a biopsy procedure. The inner cannula is advanced distally outwardly and to cause the vacuum to be generated in the vacuum chamber. The vacuum is delivered to the cutting element whereby tissue is drawn into the tissue receiving aperture. The outer cannula is advanced distally outwardly after the inner cannula such that tissue drawn into the tissue cutting aperture is severed.
Core Innovation
The invention provides a vacuum-assisted biopsy device with an outer cannula slidably mounted to a housing and an inner cannula disposed within the outer cannula. The inner cannula includes a lumen and a distal tissue receiving aperture in fluid communication with the lumen, and a vacuum chamber is disposed in the housing proximate to an open proximal end of the inner cannula. A trigger mechanism is operative to advance the distal end of the inner cannula to expose the tissue receiving aperture in response to a first actuation.
A second actuation causes the vacuum chamber to be advanced distally so that vacuum is generated in the inner cannula and delivered through the lumen to the tissue receiving aperture and the outer cannula. Vacuum draws tissue into the tissue receiving aperture of the inner cannula, and the outer cannula advances distally over the previously fired inner cannula and away from the housing so that the tissue drawn into the aperture is severed.
The invention further recites a piston slidably disposed within the vacuum chamber and attached to the inner cannula for concurrent movement, and a method in which the outer cannula, inner cannula, and vacuum chamber are arranged in cocked positions relative to the housing and moved to fired positions by first and second triggers. In this sequence, the vacuum chamber commences moving before the outer cannula commences moving, enabling vacuum generation before the outer cannula advances.
Claims Coverage
The document includes three independent claims covering sequential actuation, concurrent piston movement, and a firing sequence in which vacuum chamber movement begins before outer cannula movement.
Sequential inner cannula exposure and vacuum-driven severing
A biopsy device with an outer cannula slidably mounted to a housing, an inner cannula having a lumen and a distal tissue receiving aperture in fluid communication with the lumen, a vacuum chamber disposed in the housing proximate to an open proximal end of the inner cannula, and a trigger mechanism operative to cause the distal end of the inner cannula to advance away from the housing to expose the tissue receiving aperture in response to a first actuation and to cause the vacuum chamber to be advanced distally in response to a second actuation that generates and delivers vacuum through the lumen to the tissue receiving aperture and the outer cannula so that tissue drawn into the tissue receiving aperture is severed.
Concurrent piston movement within a vacuum chamber
A biopsy device with a housing, an outer cannula moveably mounted relative to the housing, an inner cannula slidably disposed within the outer cannula and moveably mounted relative to the housing with a lumen and a distal tissue receiving aperture fluidly connected to the lumen, a vacuum chamber fluidly connected to the lumen and moveably mounted relative to the housing, and a piston configured to be slidably disposed within the vacuum chamber and attached to the inner cannula for concurrent movement therewith during operation.
Method with vacuum chamber firing before outer cannula firing
A method for operating a biopsy device by arranging an outer cannula, an inner cannula slidably disposed within the outer cannula, and a vacuum chamber in cocked positions relative to a housing, actuating a first trigger to release the inner cannula to a fired position while maintaining the outer cannula in the cocked position, and actuating a second trigger to release the vacuum chamber and the outer cannula, wherein the vacuum chamber commences moving before the outer cannula commences moving.
Across the independent claims, the core coverage centers on a vacuum-assisted biopsy device where inner cannula exposure and vacuum generation are governed by triggers or coupled mechanical motion, and where vacuum chamber movement relative to the outer cannula is sequenced such that vacuum generation begins before outer cannula firing.
Stated Advantages
Documented Applications
No documented applications found
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