Oral craniofacial bone mill

Details Oral craniofacial bone mill Oral craniofacial bone mill

2000-03-09

2001-09-11

Smith, Jeffrey A. (Department: 3732)

Surgery

Instruments

Orthopedic instrumentation

Reexamination Certificate

active

06287312

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bone grinding apparatus and, more particularly, to a portable bone mill for use in autologous bone grafts.
2. Description of the Prior Art
Bone grinders or bone mills have been developed in the recent past to allow surgeons, particularly when dealing with oral/maxillofacial, orthopedic, periodontal, and implant applications, to perform autologous bone grafts using autogenous bone from local reservoirs. Such bone mills allow the patient to have his or her own bone particles implanted when there is a preference to using autograft to address concerns over the possibility of rejection or infection. For instance, in an oral/maxillofacial intervention, the surgeon can use bone from the patient's mandibular symphsis or ramus, then grind the bone with the bone mill, and then utilize the bone particles to repair small bone defects and to achieve bone augmentation. Such procedures reduce the costs of surgery compared where other products, such as HA granules, processed coral, or freeze-dried bone are used.
U.S. Pat. No. 5,769,853, Quétin, issued Jun. 23, 1998, and U.S. Pat. No. 5,918,821, Grooms et al, issued Jul. 6, 1999, are representative of bone grinders or mills which can produce small bone particles for the purpose of autologous bone grafts.
In the light of the existing bone mills as represented by these patents and others available in the marketplace, there is a need for a simple, power-driven bone mill which can be easily utilized in a surgical environment, using the power tools available.
SUMMARY OF THE INVENTION
It is an aim of the present invention to provide a bone mill having a simple construction and adapted to be operated by available power tools, such as a dental power drill.
It is a further aim of the present invention to provide a hygienic simple bone mill utilizing a one-use milling or cutting blade which can be easily replaced.
It is a further aim of the present invention to provide a portable bone mill which can be hand-held or clamped on a flat surface during operation.
A construction in accordance with the present invention comprises a bone mill including a vessel and a rotatable grinding tool to produce ground autologous bone particles for surgical bone reconstruction use, wherein the vessel includes a wall defining a circular cylindrical chamber having a concentric axis, the vessel further including a bottom wall at right angle to the axis, a lid adapted to be removably connected to the vessel, the lid including an opening coincident with the axis, the grinding tool including an elongated shaft extending through the opening in the lid along the axis, a cutting blade mounted to an end of the shaft within the chamber whereby the cutting blade can be rotated by motive means engaging the shaft, exterior of the vessel, to cut bone, placed in the vessel, into said bone particles.
In a preferred embodiment of the present invention, a bone mill comprises a vessel and a rotatable grinding tool to produce ground autologous bone particles for surgical bone reconstruction use, wherein the vessel includes a wall defining a circular cylindrical chamber having a concentric axis, the vessel further including a bottom wall at right angle to the axis, a lid adapted to be removably connected to the vessel, the lid including an opening coincident with the axis, the grinding tool including an elongated shaft extending through the opening in the lid along the axis, the lid including bearing means for the shaft of the grinding tool to permit the shaft to rotate on the axis, a cutting blade mounted to an end of the shaft within the chamber and a bone gripping plate on the bottom wall whereby the cutting blade can be rotated by motive means engaging the shaft, exterior of the vessel, to cut bone, placed in the vessel against the bone gripping plate, into said bone particles.
More specifically, the bone mill includes a one-use cutting blade which is removably mounted to a blade support mounted to the end of the shaft within the vessel, and a blade retention member extends through a central opening in the blade and engages the support means. It is contemplated that the cutting blade could be fixed to the shaft. The whole grinding tool could be made as a one-use tool.
Still more specifically, the blade is in the form of a thin plate having rasp openings defined by rasp cutting edges for cutting the bone against the gripping plate and passing bone particles through the rasp openings in the cutting blade within the chamber opposite to the gripping plate.


REFERENCES:
patent: 4004742 (1977-01-01), Hess
patent: 4547912 (1985-10-01), Sherva-Parker
patent: 4699325 (1987-10-01), Hess
patent: 5769853 (1998-06-01), Quétin
patent: 5918821 (1999-07-01), Grooms et al.
Micro-Knochenmühle Bone Mill.

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