Biopsy apparatus

• US 6,638,235 B2
• Filed: 05/23/2001
• Issued: 10/28/2003
• Est. Priority Date: 11/06/2000
• Status: Expired due to Term

• Current Assignee: Suros Surgical Systems Incorporated (Hologic Incorporated)
• Original Assignee: Suros Surgical Systems Incorporated (Hologic Incorporated)
• Inventors: Butcher, Charles, Miller, Michael E., Mark, Joseph L., Hancock, John P.
• Primary Examiner(s): MARMOR II, CHARLES ALAN
• Application Number:
  US09/864,031
• Publication Number:
  US 20020082519A1
• Time in Patent Office: 888 Days
• Field of Search: 600/562, 600/567, 604/19, 604/22, 604/27, 604/30, 604/34, 604/35, 604/164.01, 604/164.02, 604/164.11, 604/166.01, 604/167.03, 606/159, 606/161, 606/166, 606/167, 606/170, 606/79
• US Class Current: 600/566
• CPC Class Codes: A61B 10/025 for taking bone, bone marrow or cartilage samples
• CPC Class Codes: A61B 10/0283 with vacuum aspiration, e.g. caused by retractable plunger or by connected syringe A61B10/025, A61B10/0266 take precedence
• CPC Class Codes: A61B 17/3498 Valves therefor, e.g. flapper valves, slide valves haemostasis valves A61M39/06; check valves A61M39/24
• CPC Class Codes: A61B 2010/0208 Biopsy devices with actuators, e.g. with triggered spring mechanisms
• CPC Class Codes: A61B 2017/00973 pedal-operated
• CPC Class Codes: A61B 2217/005 with suction drainage system
• CPC Class Codes: A61B 2217/007 with irrigation system

Abstract

A disposable tissue removal device comprises a “tube within a tube” cutting element mounted to a handpiece. The inner cannula of the cutting element defines an inner lumen and terminates in an inwardly beveled, razor-sharp cutting edge. The inner cannula is driven by both a rotary motor and a reciprocating motor. At the end of its stroke, the inner cannula makes contact with the cutting board to completely sever the tissue. An aspiration vacuum is applied to the inner lumen to aspirate excised tissue through the inner cannula and into a collection trap that is removably mounted to the handpiece. The rotary and reciprocating motors are hydraulically powered through a foot pedal operated hydraulic circuit. The entire biopsy device is configured to be disposable. In one embodiment, the cutting element includes a cannula hub that can be connected to a fluid source, such as a valve-controlled saline bag.

Claims

1. A tissue cutting device comprising:

an elongated handpiece defining an elongated channel on an outer surface of said handpiece;

a cannula hub mounted to said handpiece and having a fluid port;

a tube connected at one end to said fluid port and having an opposite end connectable to a fluid source, said tube disposed within said elongated channel and sized to be recessed within said channel relative to said outer surface;

an outer cannula supported at a proximal end by said cannula hub and defining a tissue-receiving opening adjacent a distal end thereof, and a lumen between said proximal and distal ends in fluid communication with said fluid port of said cannula hub; and

an inner cutting member slidably disposed within said lumen of said outer cannula and defining a cutting edge at a distal end thereof operable to sever tissue projecting through said tissue-receiving opening.

2. The tissue cutting device of claim 1, further comprising a fluid source connected to said opposite end of said tube, said fluid source including:

a container holding a supply of a fluid; and

a valve between said container and said fluid port and operable to control the flow of fluid from said container through said tube.

3. The issue cutting device of claim 2, wherein said valve is a pinch valve engaged about said tube.

4. The tissue cutting device of claim 2, wherein said valve is opened when said inner cutting member begins to retract from said tissue-receiving opening and is closed before said inner cutting member advances forward to sever tissue projecting through said tissue-receiving opening.

5. The tissue cutting device of claim 1, wherein said cannula hub is detachably mounted to said handpiece.

6. The tissue cutting device of claim 1, wherein said cannula hub and said outer cannula are detachable from said handpiece and said inner cutting member.

7. The tissue cutting device of claim 1, wherein said handpiece includes a Luer fitting at a distal end thereof that is configured to mate with said cannula hub.

8. A tissue cutting device comprising:

an elongated handpiece;

a cannula hub detachably mounted to said handpiece and having a fluid port;

a tube connected at one end to said fluid port and having an opposite end connectable to a fluid source;

an outer cannula supported at a proximal end by said cannula hub and defining a tissue-receiving opening adjacent a distal end thereof, and a lumen between said proximal and distal ends in fluid communication with said fluid port of said cannula hub; and

an inner cutting member moveably attached to said handpiece and slidably disposed within said lumen of said outer cannula, said inner cutting member defining a cutting edge at a distal end thereof operable to sever tissue projecting through said tissue-receiving opening, and wherein said inner cutting member is attached to said handpiece when said cannula hub is detached from said handpiece.

9. A tissue cutting device comprising:

an elongated handpiece;

a cannula hub mounted to said handpiece and having a fluid port;

a tube connected at one end to said fluid port and having an opposite end connectable to a fluid source;

an outer cannula supported at a proximal end by said cannula hub and defining a tissue-receiving opening adjacent a distal end thereof, and a lumen between said proximal and distal ends in fluid communication with said fluid port of said cannula hub, said lumen including a cutting board therein proximate a distal tip of said outer cannula; and

an inner cutting member slidably disposed within said lumen of said outer cannula and defining a cutting edge at a distal end thereof that is engagable with said cutting board to sever tissue projecting through said tissue-receiving opening.

10. The tissue cutting device of claim 9, wherein said cutting board is made from a material having a hardness less than a hardness of said inner cutting member at said cutting edge, but sufficient to substantially prevent deformation of said cutting board under pressure from said cutting edge engagement.