Counter rotating biopsy needle
OwnerLarry S. Matthewsinventor
Life of this patent
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Abstract
An universally applicable biopsy needle includes two counter-rotating tubes having oppositely facing sawteeth formed on the distal ends thereof. A gear system transmits a driving force to the tubes, causing the counter-rotation which permits the sawteeth to act in a sawing manner for penetration of bone samples and in a cutting manner for soft tissues. Use of an outer cannula allows safe insertion of the needle to the location of the desired sample, and various grasping means are used to extract the sample core. The concentric, telescoping needles provide a sample preserving the natural architecture and orientation of the tissue or cell types, while minimizing harming and maceration of the same.
Claims23
A biopsy needle for cutting and removal of a core sample of bone or tissue comprising:
- (a) first and second tubes comprised of elongated concentric tubular components each having distal and proximate ends;
- (b) rotating means connected to said components at the proximate ends thereof for providing counter-rotating motion to said first and second tubes;
- and
- (c) sawteeth provided at the distal ends of said first and second tubes for sawing through bone or cutting through tissue.
A biopsy needle for cutting and removal of a core sample of bone or tissue comprising:
- (a) first and second changeable elongated concentric tubes eaching having distal and proximate ends;
- (b) a first set of teeth facing in a clockwise rotational direction and a second set of teeth facing in a counter clockwise rotational direction, said first set being formed on the distal end of one of said first and second tubes, said second set being formed on the distal end of the other of said first and second tubes;
- (c) a gear system for providing counter-rotating motions to said first and second tubes, including a housing having:
- (i) a first bevelled gear connected to said first tube,
- (ii) a second matching bevelled gear connected to said second tube, and
- (iii) at least one bevelled idler gear engaging said first and second bevelled gears;
- (d) wherein a means for driving one of said first and second bevelled gears rotates said one of said first and second tubes in a clockwise direction and said other of said first and second tubes in a counter-clockwise direction.
Dependencies are inferred from the claim text.