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Allograft tissue material for filling spinal fusion cages or related surgical spaces

  • US 5,910,315 A
  • Filed: 07/18/1997
  • Issued: 06/08/1999
  • Est. Priority Date: 07/18/1997
  • Status: Expired due to Term
First Claim
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1. A method for filling a surgical site with bone material, comprising the steps of:

  • placing a mass of lyophilized bone chips of predetermined mixed size ranging from 100 microns to 2.0 mm, said mass of chips including a packing of the interstitial spaces between the larger granular tissue particles of particulate cortical bone powder ranging from about 100 to about 300 microns and larger sized granular tissue particles in a straight-walled barrel of a syringe having a circular opening at the distal end thereof, ranging from about 8 mm to about 15 mm in diameter;

    tamping the mass of bone chips to fill air pockets in the syringe;

    adding a volume of sterile fluid ranging from about 3 to about 6 times the bulk of the volume of the mass of bone chips to provide adequate wetting;

    allowing the fluid to flow through said mass of bone chip to filly hydrate the bone chips for a period of time hydrating the bone chips until the mass is fully reconstituted from its initial lyophilized state and obtains chip self-adherence conforming to the shape of the lumen of the barrel of the syringe and retain such shape and geometric integrity;

    draining sterile fluid from the syringe; and

    depressing a plunger of the syringe and extruding the shaped bone material in a semi-solid mass which retains its shape and integrity in a surgical site.

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