Apparatus for extracting bone marrow specimens

• US 4,142,517 A
• Filed: 07/23/1976
• Issued: 03/06/1979
• Est. Priority Date: 07/23/1976
• Status: Expired due to Term

• Current Assignee: Elvia E. Contreras Guerrero De Stavropoulos, Stamatios M. Stavropoulos
• Original Assignee: Elvia E. Contreras Guerrero De Stavropoulos, Stamatios M. Stavropoulos
• Inventors: Stavropoulos, Stamatios M., Contreras Guerrero de Stavropoulos, Elvia E.
• Primary Examiner(s): Howell, Kyle L.
• Application Number:
  US05/708,162
• Time in Patent Office: 956 Days
• Field of Search: 128/2 B, 128/2 R, 128/310, 128/347
• US Class Current: 600/567
• CPC Class Codes: A61B 10/025 for taking bone, bone marrow or cartilage samples
• CPC Class Codes: A61B 2010/0258 Marrow samples
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself
• CPC Class Codes: A61B 2217/005 with suction drainage system

Abstract

The device is comprised of a guide tube having an inner end cutting edge and during insertion, carries a stylet to prevent the collection of blood and skin tissue. Adjustable guard means are on the tube for predetermining and limiting the depth of entry. After the tube has been inserted to the proper depth, the stylet is removed and a hollow needle is inserted through the tube and the bone structure into the marrow cavity to obtain a marrow sample. There are means on the needle to provide for the predetermined and limited depth of entry of the needle and motor means are provided to rotate the needle to cut through the bone and enter the marrow cavity to obtain a marrow sample. In addition after the needle has been removed, the guide tube is adapted to penetrate the bone and be moved into the marrow cavity, at which time aspiration means are connected to the outer end of the tube to aspirate marrow into the aspiration means.

Claims

1. A device for extracting marrow from a bone, comprising:

a tubular guide having an inner and outer end,

external threads on said guide adjacent said inner end,

said guide having a cutting edge on its inner end adapted to cut through the skin and to penetrate the bone surface and to aid in holding the guide in place in the bone,

a guide depth guard having internal threads engaged with said external threads adjacent said inner end, said guide being adapted to indicate and limit the desired length of insertion of the guide to penetrate the bone,

said depth guard being rotatable on said guide toward and away from said inner end and having means close to the skin to be gripped for insertion of the guide into the skin and bone,

said depth guard being adapted to abut the skin and prevent additional penetration of the guide when the guide has been inserted to the selected depth,

a hollow needle having a conical inner end having a cutting edge and an outer end engaged with rotation means for rotation thereby, said conical inner end having an axially directed opening in said inner end within said cutting edge to receive and retain marrow therein,

said needle being slidably fitted within said guide with its inner end adjacent the inner end of said guide when said guide has penetrated the bone,

said needle having its outer end extending outwardly of the outer end of the guide,

said needle having external threads adjacent the outer end of the guide, portions of said threads being adapted to be positioned to extend simultaneously into the guide and outwardly of the guide, and

a measuring guard threadedly engaged on said threads on said needle outwardly of said guide to limit inward movement of the needle in said guide and into the marrow of the bone, said threads on said needle being of substantial length to permit substantial longitudinal adjustment of the measuring guard on the needle to substantially vary the limit of said inward movement, said measuring guard limiting the inward movement by abutting the outer end of the guide.

2. The invention according to claim 1 in which:

said means to be gripped on said depth guard is generally spool-shaped.

3. The invention according to claim 1 in which:

said measuring guard is a disk.

4. The invention according to claim 1 including:

a motor connected to said needle adjacent its outer end to rotate the needle through the bone and into the marrow.

5. The invention according to claim 1 in which:

said guide has means on its outer end for connecting to an aspirator when said needle has been removed whereby a marrow sample can be withdrawn from the marrow cavity.