Bone grinder promoting bone osteoinductivity

A method of grinding human bone with a bone grinder, the method comprising:

• loading human bone into a grinding chamber of the bone grinder;
• operatively engaging a primary cutting element and a secondary cutting element via a drive mechanism;
• performing primary cutting operations on the human bone via the primary cutting element of the grinding chamber to produce intermediary bone fragments having an average size ranging from 1000 microns to 6000 microns;
• scraping processed human bone from the primary cutting element via a scraper positioned within the grinding chamber before the primary cutting element;
• directing the intermediary bone fragments from the primary cutting element to the secondary cutting element via an intermediate zone extending from the primary cutting element to a secondary first end of the secondary cutting element, wherein the intermediate zone has first and second walls sloping inward such that a distance between the first and second walls decreases in a generally linear manner from the primary cutting element to the secondary cutting element, and
• replacing osteoinductivity of the intermediary bone fragments by conveying the intermediary bone fragments from the primary cutting element to the secondary cutting element without a swirling motion of the intermediary bone fragments, such that the osteoinductivity of the intermediary bone fragments is not reduced during the step of conveying the intermediary bone fragments from the primary cutting element to the secondary cutting element;
• performing secondary cutting operations on the human bone via the secondary cutting element;
• and
• raking secondary processed human bone from the secondary cutting element via a first rake and second rake positioned within the grinding chamber after the secondary cutting element,
• wherein the secondary cutting element comprises a first cutting tool and a second cutting tool.

A method of grinding human bone with a bone grinder, the method comprising:

• loading human bone into a grinding chamber of the bone grinder via a chute;
• moving the human bone through the chute and toward a primary cutting element via a push platform;
• operatively engaging the primary cutting element and a secondary cutting element via a drive mechanism;
• grinding the human bone into intermediary bone fragments having a size in a range of from 1,000 microns to 6,000 microns via the primary cutting element;
• scraping processed human bone from the primary cutting element via a scraper positioned within the grinding chamber before the primary cutting element;
• directing the intermediary bone fragments from the primary cutting element to the secondary cutting element via an intermediate zone extending from the primary cutting element to a secondary first end of the secondary cutting element, wherein the intermediate zone has first and second walls sloping inward such that a distance between the first and second walls decreases in a generally linear manner from the primary cutting element to the secondary cutting element,
• replacing osteoinductivity of the intermediary bone fragments by conveying the intermediary bone fragments from the primary cutting element to the secondary cutting element without a swirling motion of the intermediary bone fragments such that insufficient heat is generated during the step of conveying the intermediary bone fragments from the primary cutting element to the secondary cutting element to cause any loss in osteoinductivity in the intermediary bone fragments;
• grinding the intermediary bone fragments into bone powder having a size in a range of from 125 microns to 2,000 microns via the secondary cutting element;
• and
• raking secondary processed human bone from the secondary cutting element via a first rake and second rake positioned within the grinding chamber after the secondary cutting element,
• wherein the intermediate zone is configured to prevent swirling of the intermediary bone fragments between the primary cutting element and the secondary cutting element,
• wherein the secondary cutting element comprises a first cutting tool and a second cutting tool.