Bone Marrow Aspiration Needle

Abstract

A bone marrow aspiration assembly including a cannulated introducer needle and an aspiration needle. The cannulated introducer needle is curved to approximate a natural curvature of an iliac crest. The aspiration needle includes apertures for aspirating bone marrow. The aspiration needle is configured to be received in, and extend from, the cannulated introducer needle to reach a bone marrow aspiration site in the iliac crest.

What is claimed is: 
     
         1 . A bone marrow aspiration assembly comprising:
 a cannulated introducer needle curved to approximate a natural curvature of an iliac crest; and   an aspiration needle including apertures for aspirating bone marrow, the aspiration needle is configured to be received in, and extend from, the cannulated introducer needle to reach a bone marrow aspiration site in the iliac crest.   
     
     
         2 . The bone marrow aspiration assembly of  claim 1 , wherein the cannulated introducer needle includes an open tip and is without aspiration openings about a radius thereof. 
     
     
         3 . The bone marrow aspiration assembly of  claim 1 , wherein the cannulated introducer needle includes a connector configured to mate with an aspiration syringe for aspirating bone marrow directly through the cannulated introducer needle. 
     
     
         4 . The bone marrow aspiration assembly of  claim 1 , wherein the aspiration needle includes a single group of apertures. 
     
     
         5 . The bone marrow aspiration assembly of  claim 1 , wherein the aspiration needle includes a distal group, an intermediate group, and a proximal group of apertures each having a first array of apertures and a second array of apertures, each of the groups are arranged 120° apart and each of the first arrays are arranged 180° apart from each of the second arrays. 
     
     
         6 . The bone marrow aspiration assembly of  claim 1 , wherein the cannulated introducer needle is rigid and the aspiration needle is flexible. 
     
     
         7 . A bone marrow aspiration assembly comprising:
 a cannulated bone piercing needle;   a rigid, cannulated introducer needle that is curved to approximate a natural curvature of an iliac crest, the rigid, cannulated introducer needle has a length longer than the cannulated bone piercing needle and is configured to be received within and pass through the cannulated bone piercing needle; and   a flexible aspiration needle having apertures for aspirating bone marrow, the flexible aspiration needle is configured to be received in, and extend from, the rigid, cannulated introducer needle to reach a bone marrow aspiration site in the iliac crest.   
     
     
         8 . The bone marrow aspiration assembly of  claim 7 , wherein the rigid, cannulated introducer needle has an open tip and is without aspiration openings about a radius thereof. 
     
     
         9 . The bone marrow aspiration assembly of  claim 7 , wherein the rigid, cannulated introducer needle includes a connector configured to mate with an aspiration syringe for aspirating bone marrow directly through the rigid, cannulated introducer needle. 
     
     
         10 . The bone marrow aspiration assembly of  claim 7 , wherein the flexible aspiration needle includes a single group of apertures. 
     
     
         11 . The bone marrow aspiration assembly of  claim 7 , wherein the flexible aspiration needle includes a distal group, an intermediate group, and a proximal group of apertures each having a first array of apertures and a second array of apertures, each of the groups are arranged 120° apart and each of the first arrays are arranged 180° apart from each of the second arrays. 
     
     
         12 . A method for aspirating bone marrow comprising:
 piercing bone with a cannulated bone piercing needle;   inserting into the cannulated bone piercing needle a rigid, cannulated introducer needle that is curved to approximate a natural curvature of an iliac crest and has a length longer than the cannulated bone piercing needle such that at least a tip of the rigid, cannulated introducer needle extends out from within the cannulated bone piercing needle; and   inserting into the rigid, cannulated introducer needle a flexible aspiration needle having apertures for aspirating bone marrow such that the flexible aspiration needle extends from the rigid, cannulated introducer needle to reach a bone marrow aspiration site in the iliac crest.   
     
     
         13 . The method of  claim 12 , further comprising mating an aspiration syringe with a connector of the cannulated introducer needle for aspirating bone marrow directly through the cannulated introducer needle. 
     
     
         14 . The method of  claim 12 , further comprising aspirating bone marrow through a single group of apertures of the flexible aspiration needle. 
     
     
         15 . The method of  claim 12 , further comprising aspirating bone marrow through a distal group, an intermediate group, and a proximal group of apertures of the flexible aspiration needle each having a first array of apertures and a second array of apertures, each of the groups are arranged 120° apart and each of the first arrays are arranged 180° apart from each of the second arrays. 
     
     
         16 . The method of  claim 12 , wherein the cannulated introducer needle includes an open tip and is without aspiration openings about its radius.