Biopsy device with inner cutting member

A - Human Necessities – 61 – B

Patent

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Details

A61B 10/00 (2006.01) A61B 17/32 (2006.01) A61B 17/34 (2006.01)

Patent

CA 2516663

The invention is directed to devices and methods for separating and collecting a tissue specimen from a patient~s target site. The device includes a probe member with a penetrating distal tip and a tissue receiving aperture, and a tissue cutting member which is rotatable disposed within the prove member to cut a tissue specimen drawn into the interior of the device through the aperture. The longitudinal edges of the aperture are preferably sharpened to engage the cutting edges of the tissue cutting member. Vacuum may be provided in the inner lumen of the cutting member to transport tissue therethrough. Rotation, rotational oscillation and/or longitudinal reciprocation of the tissue cutting member is effective to separate a tissue specimen from surrounding tissue. An accessing cannula having an tissue receiving aperture may be concentrically disposed within the probe member and about the tissue cutting member. The tissue cutting edge of the tissue cutting member preferably is longitudinally oriented and may have a cutting angle less than 90~ with respect to the longitudinal axis of the tissue cutting member.

Cette invention se rapporte à des dispositifs et à des procédés servant à séparer et à recueillir des échantillons de tissus d'un site cible sur le corps d'un patient. Ce dispositif comprend un élément sonde comportant une extrémité distale de pénétration et une ouverture réceptrice de tissu, et un élément de coupe de tissu qui est disposé rotatif dans l'élément sonde, de façon à couper un échantillon de tissu amené à l'intérieur du dispositif par ladite ouverture. Les bords longitudinaux de l'ouverture sont de préférence aiguisés pour venir en contact avec les bords tranchants de l'élément de coupe de tissu. Une aspiration peut être créée dans le passage interne de l'élément de coupe pour transporter les tissus à travers lui. La rotation, l'oscillation rotative et/ou le mouvement de va-et-vient longitudinal de l'élément de coupe de tissu sert à séparer un échantillon de tissu du tissu qui l'entoure. Une canule d'accès comportant une ouverture réceptrice de tissu peut être disposée en position concentrique à l'intérieur de l'élément sonde et autour de l'élément de coupe de tissu. Le bord tranchant de l'élément de coupe de tissu est de préférence orienté longitudinalement et il peut présenter un angle de coupe inférieure à 90· par rapport à l'axe longitudinal de l'élément de coupe de tissu.

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