초록 ▼

A biopsy device and method are provided for removing samples of tissue from a patient's body. The device comprises a hollow outer needle with an opening, a rotatable inner needle with a cutting surface and a driving mechanism within a handle assembly. The needles are inserted into the patient's body

A biopsy device and method are provided for removing samples of tissue from a patient's body. The device comprises a hollow outer needle with an opening, a rotatable inner needle with a cutting surface and a driving mechanism within a handle assembly. The needles are inserted into the patient's body and the inner needle is rotated so as to expose the cutting surface. The driving mechanism is activated and the inner needle is oscillated along its longitudinal axis at a desired frequency. The inner needle is then rotated and tissue is pinched between the cutting surface and the outer needle. The combination of the pinching force and the oscillating motion severs a uniform sample of tissue. The tissue is captured between the cutting surface of the inner needle and the inner surface of the outer needle. The driving mechanism is then deactivated and the device is removed from the patient's body. The needle portion of the device may be removed from the handle assembly and discarded.

대표청구항 ▼

[ What is claimed is:] [1.] A biopsy device for removing tissue from a body, comprising:(A) a hollow outer needle, said outer needle having an opening defined by a sharp cutting edge;(B) a inner needle received within said outer needle having a cutting surface substantially aligned with said opening

[ What is claimed is:] [1.] A biopsy device for removing tissue from a body, comprising:(A) a hollow outer needle, said outer needle having an opening defined by a sharp cutting edge;(B) a inner needle received within said outer needle having a cutting surface substantially aligned with said opening of said outer needle and a substantially solid center, said inner needle having a substantially semicircular cross-section at said cutting surface, said outer needle and said inner needle having a common longitudinal axis and being adapted to rotate and translate relative to each other;(C) a rotation mechanism for producing relative rotation between said inner needle and said outer needle whereby the tissue protrudes into said opening and is pinched between said cutting edge and said cutting surface and severed from the body, wherein the severed tissue may be held between said inner needle and said outer needle while said inner needle and said outer needle are withdrawn from the body; and(D) a driving mechanism for oscillating either said outer needle or said inner needle or both along the longitudinal axis whereby a cutting motion is provided for severing the tissue.