Biopsy device with replaceable probe incorporating static vacuum source dual valve sample stacking retrieval and saline flush

1. A biopsy device, comprising:

a. a needle comprising a probe tube having a sample aperture;

b. a cutter tube received in the probe tube for relative axial translation across the sample aperture to sever tissue prolapsed therein, a first fluid passage defined within the cutter tube and a second fluid passage defined between an outer surface of the cutter tube and an inner surface of the probe tube, wherein the cutter tube is operable to translate axially;

c. a flush control;

d. a flush valve assembly responsive to the distally positioned cutter tube and to an activation of the flush control to couple a selected one of the first and second fluid passage to a liquid source, wherein the other one of the first and second fluid passage is maintained at a lower pressure to the liquid source to effect fluid through the needle;

e. a vacuum assist valve assembly responsive to an at least partially retracted longitudinal position of the cutter tube to couple a selected one of the first and second fluid passage to a pneumatic source, wherein the vacuum assist valve assembly further comprises a valve body comprising a distally open cylinder body, a first port distally positioned, a second port positioned proximal to the first port, and a third port positioned between the first and second port; and

f. a vacuum valve actuator having distal and proximal dynamic seals spaced to encompass the first and third ports when distally positioned and the second and third ports when proximally positioned.

2. The biopsy device of claim 1 , wherein the probe tube further comprises a cylindrical cutter lumen attached to and in distal fluid communication with a lateral lumen defining the second fluid passage.

3. The biopsy device of claim 1 , further comprising:

a. a cutter gear proximally attached to the cutter tube;

b. a lead translation screw longitudinally aligned with the translation of the cutter gear; and

c. a first carriage longitudinally translated by rotation of the lead screw engagable to a proximal portion of the cutter tube.

4. The biopsy device of claim 3 , further comprising a second carriage engaged to the lead screw proximal to the first carriage, the lead screw further comprising a distal nonengaging portion enabling free wheeling of the first carriage, wherein the first carriage is operable to draw the second carriage onto an engaging portion of the lead screw, the second carriage engaged to the flush valve assembly.

5. The biopsy device of claim 3 , further comprising a rotation spur gear engaged to the cutter gear during translation for imparting a rotation to the cutter tube.

6. The biopsy device of claim 5 , further comprising a motor driven gearbox operatively configured to turn the translation lead screw and the rotation spur gear at a fixed ratio.

7. The biopsy device of claim 1 , wherein the first port is connectable to a first pressure source, the second port is connectable to a second pressure source having lower pressure than the first pressure source, the third port is in communication with a vacuum lumen conduit, and the vacuum valve actuator is operatively configured to place the first port into communication with the third port during at least a portion of proximal translation of the cutter tube and to place the second port into communication with the third port during at least a portion of distal translation of the cutter tube.

8. A biopsy device, comprising:

a. a probe assembly, comprising:

i. a probe support structure,

ii. a probe tube attached to the probe support structure and having a side aperture,

iii. a cutter tube slidingly received by the probe tube and sized to translate across the side aperture,

iv. a first fluid passage defined within the cutter tube and a second fluid passage defined between an outer surface of the cutter tube and an inner surface of the probe tube,

v. a pneumatic conduit connectable between a vacuum source and a proximal end of the probe tube communicating with a selected one of the first and second fluid passages, and

vi. a flush valve assembly operatively configured to selectively communicate between a fluid source and the proximal end of the probe communicating with the other one of the first and second fluid passages; and

b. a hand piece, comprising:

i. a hand piece support structure having a lateral engaging portion operatively configured to receive the probe assembly,

ii. a lead screw for cutter translation attached for rotation to the hand piece support structure,

iii. a first carriage longitudinally translated by rotation of the lead screw and having an engagement member positioned to engage a proximal portion of the cutter tube, and

iv. a second carriage, wherein the second carriage engages the lead screw proximal to the first carriage, the lead screw further comprising a distal nonengaging portion enabling free wheeling of the first carriage.

9. The biopsy device of claim 8 , wherein the probe tube further comprises a cylindrical cutter lumen attached to and in distal fluid communication with a lateral lumen defining the second fluid passage.

10. The biopsy device of claim 8 , wherein the probe assembly further comprises a cutter gear attached to the proximal portion of the cutter tube, the hand piece further comprising a rotation spur gear aligned to engage the cutter gear during longitudinal translation of the first carriage.

11. The biopsy device of claim 10 , wherein the hand piece further comprises a motor and a gearbox operatively configured to turn the translation lead screw and the rotation spur gear when the gearbox is driven by the motor.

12. The biopsy device of claim 8 , further comprising a vacuum assist valve assembly, comprising:

a. a vacuum assist valve body comprising first, second and third ports, the first port connectable to a first pressure source, the second port connectable to a second pressure source having lower pressure than the first pressure source, the third port in communication with the other one of the first and second fluid passage; and

b. a vacuum assist valve actuator coupled to the first carriage and operatively configured to place the first port into communication with the third port during at least a portion of proximal translation of the cutter tube and to place the second port into communication with third port during at least a portion of distal translation of the cutter tube.

13. The biopsy device of claim 12 , wherein the second carriage is longitudinally translated by rotation of the lead screw and positioned to engage for movement the flush valve assembly of the probe assembly, wherein the flush valve assembly further comprises:

a. a flush valve body comprising first, second and third ports, the first port connectable to the fluid source, the second port connectable to the vacuum assist valve assembly, the third port in communication with the vacuum lumen conduit; and

b. a flush valve actuator coupled to the second carriage and operatively configured to place the first port into communication with the third port during at least a portion of the proximal translation of the second carriage and to place the second port into communication with the third port during at least a portion of distal translation of the cutter tube.

14. The biopsy device of claim 8 further comprising a vacuum assist valve assembly comprising:

a. a vacuum assist valve body attached to the probe support structure having a distally open cylinder body having a first port distally positioned, a second port positioned proximal to the first port, and a third port positioned between the first and second port; and

b. a vacuum valve actuator having distal and proximal dynamic seals spaced to encompass the first and third ports when distally positioned and the second and third ports when proximally positioned.

15. The biopsy device of claim 8 , wherein the hand piece further comprises a spring biased member reciprocatingly cammed to impart a longitudinal reciprocating motion to the probe during insertion.

16. A biopsy device, comprising:

a. a probe assembly, comprising:

i. a probe support structure,

ii. a probe attached to the probe support structure and having a side aperture,

iii. a cutter tube slidingly received by the probe and sized to translate across the side aperture,

iv. a lateral lumen of the probe communicating with the side aperture,

v. a pneumatic conduit connectable between a vacuum source and a proximal end of the cutter tube, and

vi. a tissue sample retraction mechanism; and

b. a hand piece, comprising:

i. a hand piece support structure having a lateral engaging portion operatively configured to receive the probe assembly,

ii. a lead screw for cutter translation attached for rotation to the hand piece support structure,

iii. a first carriage longitudinally translated by rotation of the lead screw and having an engagement mechanism positioned to engage a proximal portion of the cutter tube, and

iv. a second carriage longitudinally translated by rotation of the lead screw and positioned to engage for movement the tissue sample retraction mechanism.

17. The biopsy device of claim 16 , wherein the tissue sample retraction mechanism of the probe assembly comprises a proximal stacker operatively configured to pneumatically retract tissue samples through the cutter tube.

18. The biopsy device of claim 16 , wherein the tissue sample retraction mechanism of the probe assembly comprises a straw assembly reciprocally inserted through the cutter tube to retract tissue samples.

19. The biopsy device of claim 16 , wherein the probe assembly further comprises a vacuum assist valve assembly operatively configured to selectively communicate the vacuum source to the lateral lumen.

20. A biopsy system for performing a core biopsy procedure, comprising:

a. a static vacuum source;

b. a fluid supply; and

c. a hand-held device, comprising:

i. a core biopsy probe comprising a cutter lumen having a distal sample aperture,

ii. a housing proximally attached to the core biopsy probe and sized to be manually held for positioning the core biopsy probe,

iii. a fluid input attached to the housing and attachable to the fluid supply,

iv. user controls attached to the housing,

v. a motorized cutter translated in the cutter lumen of the core biopsy probe in response to the user controls,

vi. a valve assembly responsive to the user controls to selectively communicate the fluid input to the core biopsy probe,

vii. a lead screw for cutter translation attached for rotation to the housing,

viii. a first carriage longitudinally translated by rotation of the lead screw and having an engagement mechanism positioned to engage a proximal portion of the cutter, and

ix. a second carriage longitudinally translated by rotation of the lead screw and positioned to engage for movement the valve assembly.

21. The biopsy system of claim 20 , wherein the hand-held device further comprises a pneumatic input attached to the housing and attachable to the static vacuum source, the core biopsy probe further comprising a vacuum lumen communicating with the distal sample aperture, the cutter lumen communicating with the static vacuum source, the valve assembly further responsive to a first position of the cutter to communicate static vacuum pressure to the vacuum lumen to prolapse tissue into the sample aperture, responsive to a second position of the cutter to communicate atmospheric pressure to the vacuum lumen to retract a severed tissue sample, and responsive to the user controls to communicate the fluid supply to the vacuum lumen.