US20050027210A1 — Biopsy apparatus

Claim 1

Independent Claim 146 words

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 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.

Claim 2

Dependent Claim 146 words

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 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.

Claim 3

Dependent Claim 61 words

2 . The biopsy apparatus of claim 1 , further including: a tubular axle having a distal end and a proximal end; and a coupler connecting the distal end of the tubular axle to the proximal end of the inner cannula; wherein the first MRI compatible device is coupled to the tubular axle to rotate the axle and the inner cannula.

Claim 4

Dependent Claim 20 words

3 . The biopsy apparatus of claim 2 , wherein the first MRI compatible device is a hydraulic rotary motor.

Claim 5

Dependent Claim 69 words

4 . The biopsy apparatus of claim 3 , wherein the first MRI compatible device includes: a motor housing having opposite ends and defining a pilot port in fluid communication with a hydraulic system to receive pressurized fluid; a rotor rotatably positioned within the housing and connected to the axle extending through the housing; and bearing surfaces at the opposite ends of the housing for rotatably supporting the axle.

Claim 6

Dependent Claim 20 words

5 . The biopsy apparatus of claim 4 , wherein the second MRI compatible device is a hydraulic reciprocating motor.

Claim 7

Dependent Claim 77 words

6 . The biopsy apparatus of claim 5 , wherein the hydraulic reciprocating motor further includes: a hydraulic cylinder having a pilot port in fluid communication with the hydraulic system to receive pressurized fluid; a piston slidably disposed within said cylinder; and a hollow tube in fluid communication with the proximal end of the tubular axle; the tube engaged to the piston and operably coupled to the hydraulic rotary motor as the piston slides within the cylinder.

Claim 8

Dependent Claim 46 words

7 . The biopsy apparatus of claim 6 , further including a return spring disposed within the cylinder and biased against the piston to move the piston, the housing, and the inner cannula in a predetermined direction away from the distal end of the outer cannula.

Claim 9

Dependent Claim 17 words

8 . The biopsy apparatus of claim 7 , wherein the hydraulic system includes a vacuum source.

Claim 10

Dependent Claim 44 words

9 . The biopsy apparatus of claim 8 , further including a tissue collection chamber removably mounted to the handpiece and interposed between the vacuum source and an end of the inner cannula to receive severed tissue drawn into the chamber by the vacuum.

Claim 11

Dependent Claim 30 words

10 . The biopsy apparatus of clam 9 , wherein the tissue collection chamber includes a filter that permits fluid to pass while retaining the severed tissue within the chamber.

Claim 12

Dependent Claim 30 words

10 . The biopsy apparatus of clam 9 , wherein the tissue collection chamber includes a filter that permits fluid to pass while retaining the severed tissue within the chamber.

Claim 13

Dependent Claim 19 words

11 . The biopsy apparatus of claim 1 , wherein the disposable cutting element snaps into the reusable handpiece.

Claim 14

Dependent Claim 20 words

12 . The biopsy apparatus of claim 1 , wherein the cutting element is slidingly engaged with the reusable handpiece.

Claim 15

Dependent Claim 21 words

13 . The biopsy apparatus of claim 1 , wherein the inner and outer cannulae are constructed of inconel or titanium.

Claim 16

Dependent Claim 22 words

14 . The biopsy apparatus of claim 1 , wherein the cutting edge of the cutting element is an inwardly beveled surface.

Claim 17

Dependent Claim 13 words

15 . The biopsy apparatus of claim 1 further including a trocar tip.

Claim 18

Dependent Claim 29 words

16 . The biopsy apparatus of claim 15 , wherein the trocar tip has an enagement hub configured to fit tightly within the distal end of the outer cannula.

Claim 19

Dependent Claim 20 words

17 . The biopsy apparatus of claim 16 , wherein the hub includes an irrigation fitting having an irrigation lumen.

Claim 20

Dependent Claim 23 words

18 . The biopsy apparatus of claim 1 , further including a cutting board disposed at the distal end of the outer cannula.

Claim 21

Dependent Claim 26 words

19 . The biopsy apparatus of claim 18 , wherein the cutting board is affixed to an engagement hub that is affixed to a trocar tip.

Claim 22

Dependent Claim 39 words

20 . The biopsy apparatus of claim 1 , wherein the tissue receiving opening includes a longitudinal edges that have at least one tooth arranged to engage tissue surrounding the cannula when the cannula is inserted into the body.

Claim 23

Dependent Claim 24 words

21 . The biopsy apparatus of claim 1 , further including a stiffening element incorporated into the outer cannula opposite the tissue receiving opening.

Claim 24

Dependent Claim 146 words

22 . A biopsy apparatus, comprising: 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, 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 wherein the reusable handpiece includes a hydraulic rotary motor detachably coupled to said inner cannula 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.

Claim 25

Dependent Claim 146 words

22 . A biopsy apparatus, comprising: 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, 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 wherein the reusable handpiece includes a hydraulic rotary motor detachably coupled to said inner cannula 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.

Claim 26

Dependent Claim 19 words

23 . The biopsy apparatus of claim 22 , wherein the disposable cutting element snaps into the reusable handpiece.

Claim 27

Dependent Claim 20 words

24 . The biopsy apparatus of claim 22 , wherein the cutting element is slidingly engaged with the reusable handpiece.

Claim 28

Dependent Claim 21 words

25 . The biopsy apparatus of claim 22 , wherein the inner and outer cannulae are constructed of inconel or titanium.

Claim 29

Dependent Claim 29 words

26 . The biopsy apparatus of claim 22 , wherein the hydraulic rotary motor and the hydraulic reciprocating motor are constructed of a material that is compatible with MRI.

Claim 30

Dependent Claim 63 words

27 . The biopsy apparatus of claim 22 further including a vacuum source fluidly connected to the inner cannula for generating a vacuum in the lumen of the inner cannula to draw severed tissue therethrough and a tissue collection chamber positioned between the vacuum source and an end of the inner cannula to receive severed tissue drawn into the chamber by the vacuum.

Claim 31

Dependent Claim 16 words

28 . The biopsy apparatus of claim 27 wherein the tissue collection chamber includes a filter.

Biopsy apparatus

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