Device for rapid aspiration and collection of body tissue from within an enclosed body space

Abstract

Device and method for rapid extraction of body tissue from an enclosed body cavity. Hollow entry cannula with optional core element provides entry into body tissue space such as bone marrow. Aspiration cannula is inserted through the hollow entry cannula into the body tissue and is manipulated to advance directionally through the body cavity. Optional stylet within the aspiration cannula aids in advancing the aspiration cannula through the body tissue and is removed to facilitate extraction of the body tissue through the aspiration cannula. Inlet openings near distal tip of the aspiration cannula allow tissue aspiration, with negative pressure source at the proximal end of the aspiration cannula providing controlled negative pressure. The aspiration cannula may be withdrawn and its path adjusted for multiple entries through a same entry point, following different paths through the body tissue space for subsequent aspiration of more tissue.

1 . (canceled) 
     
     
         2 . A system for bone marrow aspiration, comprising:
 an aspiration cannula having a flexible length coupled at a proximal end to a handle and attached at a distal end to a drill tip shaped to break up bone marrow, wherein the flexible length is configured to allow the aspiration cannula to follow a path whereby the drill tip is deflectable,   wherein the distal end defines one or more openings which are configured to aspirate the bone marrow when the cannula is placed within the bone marrow and the drill tip is rotated relative to the handle when advanced through the bone marrow, and   wherein the drill tip comprises a proximal portion and a distal portion having a rounded blunt tip, where the drill tip terminates at the rounded blunt tip such that the drill tip moves sideways upon encountering a surface of a cortical bone within the cavity without causing trauma to the surface.   
     
     
         3 . The system of  claim 1  further comprising a stylet slidably removable from a lumen defined through the aspiration cannula. 
     
     
         4 . The system of  claim 1  further comprising an entry cannula having a needle tip adapted to create an entry port through the cortical bone. 
     
     
         5 . The system of  claim 1  further comprising a control mechanism coupled to the distal end of the flexible length for directing a path of the drill tip through the bone marrow. 
     
     
         6 . The system of  claim 1  wherein at least one of the openings near the distal end defines an injection port in fluid communication with an anticoagulant. 
     
     
         7 . The system of  claim 1  further comprising an anticoagulant lining or coating along an inner surface of the aspiration cannula. 
     
     
         8 . A system for bone marrow aspiration, comprising:
 an aspiration cannula having a flexible length coupled at a proximal end to a handle and attached at a distal end to a distal tip shaped to break up bone marrow, wherein the flexible length is configured to follow a path such that the distal tip is deflected when contacted with cortical bone and inhibited from puncturing through the cortical bone layer;   wherein the distal end defines one or more openings which are configured to aspirate bone marrow when the cannula is placed within the bone marrow and the distal tip is rotated relative to the handle and advanced through the bone marrow,   wherein the distal tip comprises a rotatable drill tip having a proximal fluted tapered portion which is tapered in a distal direction from a proximal end of the drill tip, and a distal portion having a rounded blunt tip, and   wherein the distal tip terminates at the rounded blunt tip and wherein the distal tip is shaped to pass through the bone marrow while also shaped to be inhibited from puncturing through the cortical layer of bone such that the aspiration cannula is retained within the bone marrow cavity and the distal tip is configured to move sideways directly in contact along the layer of cortical bone upon encountering the cortical bone while rotating and without puncturing out of the bone marrow cavity.   
     
     
         9 . The system of  claim 8  further comprising an entry cannula having a needle tip adapted to create an entry port through the cortical bone layer. 
     
     
         10 . The system of  claim 8  further comprising a control mechanism coupled to the distal end of the length for directing a path of the drill tip through the bone marrow. 
     
     
         11 . The system of  claim 8  wherein at least one of the one or more openings are in fluid communication with an anticoagulant. 
     
     
         12 . The system of  claim 8  further comprising an anticoagulant lining or coating along an inner surface of the aspiration cannula. 
     
     
         13 . A system for tissue bone marrow aspiration, comprising:
 an aspiration cannula having a flexible length and a distal end which is deflectable in all directions relative to a proximal end of the length which is coupled to a handle, wherein the aspiration cannula defines one or more openings near the distal end which are in fluid communication with a lumen defined through the length, the one or more openings being configured to aspirate disrupted bone marrow; and,   a drill tip which is rotatable relative to the handle and attached at the distal end of the flexible length, wherein the drill tip comprises a proximal fluted portion having a shape which narrows distally from a proximal end of the drill tip to a distal portion having a rounded blunt tip, wherein the drill tip terminates at the rounded blunt tip and whereby the rounded blunt tip comprises a surface which is shaped to inhibit the drill tip from puncturing through a cortical layer of bone while rotating against the cortical layer of bone.   
     
     
         14 . The system of  claim 13  further comprising an entry cannula having a needle tip adapted to create an entry port through the cortical bone. 
     
     
         15 . The system of  claim 13  further comprising a control mechanism coupled to the distal end of the length for directing a path of the drill tip through the bone marrow. 
     
     
         16 . The system of  claim 13  wherein at least one of the one or more openings are in fluid communication with an anticoagulant. 
     
     
         17 . The system of  claim 13  further comprising an anticoagulant lining or coating along an inner surface of the lumen.