Biopsy apparatus
First Claim
Patent Images
1. A biopsy apparatus, comprising:
- a disposable cutting element and a reusable handpiece;
wherein the disposable cutting element includes an outer cannula defining an outer lumen, a tissue-receiving opening proximate a distal end of the outer cannula communicating with the outer lumen, and an inner cannula slidably disposed within the outer lumen and defining an inner lumen from an open distal end to an open proximal end opposite the distal end, wherein the inner cannula includes a cutting edge at the open distal end operable to sever tissue projecting through the tissue-receiving opening, and a tissue aspiration path in the inner lumen from the open distal end of the inner cannula to the open proximal end of the inner cannula; and
wherein the reusable handpiece includes a first MRI compatible device detachably coupled to said inner cannula to rotate the inner cannula within the outer cannula, and a second MRI compatible device detachably coupled to the inner cannula to translate the inner cannula within the outer cannula while the inner cannula rotates, wherein the second MRI compatible device includes a hydraulic cylinder and a piston slidably disposed within said cylinder.
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Abstract
A biopsy apparatus having a disposable cutting element and a reusable handpiece is disclosed. The disposable cutting element includes an inner cannula that defines an inner lumen and terminates in a cutting edge. The inner cannula is slidably disposed within an outer cannula that defines an outer lumen that has a tissue-receiving opening. The inner cannula is driven by a rotary motor and a reciprocating motor. Both motors are constructed of a MRI compatible material.
257 Citations
26 Claims
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1. A biopsy apparatus, comprising:
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a disposable cutting element and a reusable handpiece; wherein the disposable cutting element includes an outer cannula defining an outer lumen, a tissue-receiving opening proximate a distal end of the outer cannula communicating with the outer lumen, and an inner cannula slidably disposed within the outer lumen and defining an inner lumen from an open distal end to an open proximal end opposite the distal end, wherein the inner cannula includes a cutting edge at the open distal end operable to sever tissue projecting through the tissue-receiving opening, and a tissue aspiration path in the inner lumen from the open distal end of the inner cannula to the open proximal end of the inner cannula; and wherein the reusable handpiece includes a first MRI compatible device detachably coupled to said inner cannula to rotate the inner cannula within the outer cannula, and a second MRI compatible device detachably coupled to the inner cannula to translate the inner cannula within the outer cannula while the inner cannula rotates, wherein the second MRI compatible device includes a hydraulic cylinder and a piston slidably disposed within said cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A biopsy apparatus, comprising:
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a disposable cutting element detachably connected to a reusable handpiece; wherein the disposable cutting element includes an outer cannula defining an outer lumen, a tissue-receiving opening proximate a distal end of the outer cannula communicating with the outer lumen, an inner cannula slidably disposed within the outer lumen and defining an inner lumen from an open distal end to an open proximal end opposite the distal end, and a drive gear disposed about a portion of a length of the inner cannula and having a plurality of longitudinally extending teeth, wherein the inner cannula includes a cutting edge at the open distal end operable to sever tissue projecting through the tissue-receiving opening, and a tissue aspiration path in the inner lumen that passes through the drive gear; and wherein the reusable handpiece includes a hydraulic rotary motor detachably coupled to said inner cannula by said drive gear to rotate the inner cannula within the outer cannula, and a hydraulic reciprocating motor detachably coupled to the inner cannula to translate the inner cannula within the outer cannula while the inner cannula rotates. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A biopsy apparatus, comprising:
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a disposable cutting element and a reusable handpiece; wherein the disposable cutting element includes an outer cannula defining an outer lumen, a tissue-receiving opening proximate a distal end of the outer cannula communicating with the outer lumen, and an inner cannula slidably disposed within the outer lumen and defining an inner lumen from an open distal end of the inner cannula to an open proximal end of the inner cannula opposite the distal end of the inner cannula, the inner cannula includes a cutting edge at the open distal end that is operable to sever tissue projecting through the tissue-receiving opening, the disposable cutting element further includes a drive gear having first and second ends and a plurality of longitudinal teeth disposed about a portion of a length of the inner cannula, a tissue aspiration path in the inner lumen from the open distal end of the inner cannula to the open proximal end of the inner cannula, and a tissue collection chamber with a filter, such that the open proximal end of the inner cannula is disposed in the tissue collection chamber; wherein the reusable handpiece includes an MRI compatible hydraulic rotary motor detachably coupled to the drive gear to rotate the inner cannula within the outer cannula, and an MRI compatible hydraulic reciprocating motor, and the hydraulic reciprocating motor comprises a hydraulic cylinder, a piston slidably disposed in the hydraulic cylinder, and a push rod having a first end connected to the piston and a second end detachably coupled to the drive gear adjacent the first end of the drive gear to translate the inner cannula within the outer cannula while the inner cannula rotates.
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Specification