Biopsy device having rotational cutting
First Claim
1. A biopsy device, comprising:
- a probe assembly including;
a first cannula having a first side wall defining a first lumen, said first cannula having a first proximal end and a first distal end, said first cannula having a first aperture extending through said first side wall to said first lumen proximal to said first distal end, said first cannula having a longitudinal axis, anda second cannula having a second side wall defining a second lumen, said second cannula having a second proximal end and a second distal end, said second cannula having a second aperture extending through said second side wall to said second lumen proximal to said second distal end, said second cannula being disposed co-axially with said first cannula,at least one of said first aperture and said second aperture having a cutting edge; and
a driver unit configured for releasably mounting said probe assembly, said driver unit being operatively configured to simultaneously rotate said first cannula and said second cannula in opposite rotational directions at different rotational velocities so that said first aperture and said second aperture periodically come into alignment to form a virtual tissue sample aperture.
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Accused Products
Abstract
A biopsy device includes a probe assembly and a driver unit. The probe assembly includes a first cannula having a first aperture extending to a lumen proximal to a first distal end of the first cannula. A second cannula has a second aperture extending to a lumen proximal to the second distal end of the second cannula. The second cannula is disposed co-axially with the first cannula. A least one of the first aperture and the second aperture has a cutting edge. The driver unit is configured for releasably mounting the probe assembly. The driver unit is operatively configured to simultaneously rotate the first cannula and the second cannula at different rotational velocities so that the first aperture and the second aperture periodically come into alignment to form a virtual tissue sample aperture.
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Citations
27 Claims
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1. A biopsy device, comprising:
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a probe assembly including; a first cannula having a first side wall defining a first lumen, said first cannula having a first proximal end and a first distal end, said first cannula having a first aperture extending through said first side wall to said first lumen proximal to said first distal end, said first cannula having a longitudinal axis, and a second cannula having a second side wall defining a second lumen, said second cannula having a second proximal end and a second distal end, said second cannula having a second aperture extending through said second side wall to said second lumen proximal to said second distal end, said second cannula being disposed co-axially with said first cannula, at least one of said first aperture and said second aperture having a cutting edge; and a driver unit configured for releasably mounting said probe assembly, said driver unit being operatively configured to simultaneously rotate said first cannula and said second cannula in opposite rotational directions at different rotational velocities so that said first aperture and said second aperture periodically come into alignment to form a virtual tissue sample aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A biopsy device, comprising:
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a probe assembly including; a first cannula having a first side wall defining a first lumen, said first cannula having a first proximal end and a first distal end, said first cannula having a first aperture extending through said first side wall to said first lumen proximal to said first distal end, said first cannula having a longitudinal axis, and a second cannula having a second side wall defining a second lumen, said second cannula having a second proximal end and a second distal end, said second cannula having a second aperture extending through said second side wall to said second lumen proximal to said second distal end, said second cannula being disposed co-axially with said first cannula, at least one of said first aperture and said second aperture having a cutting edge; and a driver unit configured for releasably mounting said probe assembly, said driver unit being operatively configured to rotate said first cannula in accordance with a first velocity profile and said second cannula in accordance with a second velocity profile to periodically align said first aperture and said second aperture to form a virtual tissue sample aperture at a plurality of angular radial positions relative to said longitudinal axis during a biopsy procedure by continuous simultaneous rotation of both of said first cannula and said second cannula. - View Dependent Claims (22, 23)
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24. A method for controlling a biopsy device during a biopsy procedure, said biopsy device having a probe assembly with an outer cannula having a distal needle tip and an inner cannula arranged coaxial with said outer cannula with respect to a longitudinal axis, said outer cannula having a first side aperture and said inner cannula having a second side aperture with at least one of said first side aperture and said second side aperture having a cutting edge, and a vacuum source connected in fluid communication with a lumen of said inner cannula and with a tissue sample receptacle, comprising:
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positioning each of said outer cannula and said inner cannula at a respective initial rotational position; inserting said probe assembly in a region of a patient to be biopsied; establishing continuous simultaneous rotation of said outer cannula in accordance with a first velocity profile and said inner cannula in accordance with a second velocity profile to periodically align said first side aperture and said second side aperture to form a virtual tissue sample aperture at a plurality of angular radial positions relative to said longitudinal axis; establishing a supply of negative pressure in said lumen of said inner cannula, such that each time said virtual tissue sample aperture is formed tissue is pulled through said virtual tissue sample aperture into said lumen of said inner cannula, thereafter said first side aperture and said second side aperture cooperate to sever said tissue that is pulled into said inner cannula as said virtual tissue sample aperture is closed by said continuous simultaneous rotation of said outer cannula and said inner cannula, each tissue sample so severed being transported through said lumen of said inner cannula by said negative pressure to a tissue sample receptacle; and ceasing said continuous simultaneous rotation of said outer cannula and said inner cannula after all desired tissue samples have been harvested. - View Dependent Claims (25, 26, 27)
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Specification