Patent ID: 11918793
Assignee: UNIVERSITY OF PITTSBURGH—OF THE COMMONWEALTH SYSTEM OF HIGHER EDUCATION
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A fat grafting device, comprising:
a rotatable internal body having a lumen, an axis of rotation, a first end comprising a central outlet from the lumen, a porous wall configured to retain fat tissue or cells within the lumen and pass liquids through the wall, and a second end opposite the first end, having an opening;
an external body surrounding and rotatably retaining the internal body, the external body having a first end comprising a cannula adaptor aligned with at least a portion of the central outlet of the internal body, and a second end opposite the first end, having an opening;
a piston slidably disposed within the internal body and having a peripheral seal engaging an inner surface of the porous wall of the internal body;
an internal plunger body attached to the piston and defining a central cavity;
an external plunger body rotatably retaining the internal plunger body and disposed at the second end of the external body; and
a drive assembly attached to the internal plunger body and comprising within the internal plunger body, either:
a cylindrical first plunger having first spiral threads, a first ratchet configured to engage the first spiral threads of the cylindrical first plunger, and a retainer attached to the internal plunger body configured to engage the first ratchet, or
second spiral threads on an inside surface of the internal plunger body, a second plunger, and a second ratchet affixed to the second plunger so as to rotate in only one direction, the second ratchet engaging the second spiral threads on the inside surface of the internal plunger body,

wherein the piston engages the internal body, so that when the internal plunger body and piston are rotated, the internal body rotates.