| 摘要 |
A device to retrieve a specimen from soft tissue includes a cannula having an axial lumen, a sharpened distal tip and at least one tissue urging feature extending along at least a portion of the length of the cannula. As the cannula rotates, the tissue urging feature urges the specimen into the lumen. A vacuum may be used to assist in drawing the specimen into the lumen. The tissue urging feature may be continuous or discontinuous, such as a spiral thread within the lumen of the cannula, spirally wound raised features or a combination of raised and recessed features. The lumen may include a proximal section having a larger diameter than a distal section thereof. A soft tissue biopsy method includes a step of advancing a rotating cannula-stylet combination into a mass of soft tissue, the cannula having a distal center lumen and a proximal center lumen aligned with the distal lumen, the proximal lumen having a larger diameter than the diameter of the distal lumen. The stylet is at least partially retracted when the combination is near the target site within the soft tissue. The tissue within the distal lumen is then twisted and compressed as the tissue progresses therethrough as the cannula rotates and advances to and through the target site. The twisted and compressed tissue is thereafter at least partially untwisted and decompressed as it enters the proximal lumen. The tissue is then collected from the proximal lumen.
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