Constant Pressure Syringe For Surgical Use
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Accused Products
Abstract
A closed system for harvesting fat through liposuction, concentrating the aspirate so obtained, and then re-injecting the concentrated fat into a patient comprises as its main components a low pressure cannula having between about 7 to 12 side holes of about 1-2 mm by 2.0 to 4.0 mm, a spring loaded syringe holder with a helicoidal spring to apply a substantially constant pressure over the full excursion of the plunger, and a preferably flexible collection bag which is also preferably graduated, cylindrical over most of its body and funnel shaped at its bottom, all of which are connected through flexible tubings to a multi-port valve. The multi-port valve has two flutter/duck bill valves which restrict the fluid flow to a one way direction which effectively allows the syringe to be used to pump fat out of a patient and into a collection bag in a continuous manner. After the bags are centrifuged to concentrate the fat, the excess fluids are separated and the valve is re-connected to permit the syringe pump to reverse fluid flow to graft the concentrated fat back into the patient.
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Citations
50 Claims
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1-29. -29. (canceled)
- 30. A constant pressure syringe driver device, said device including a bracket for engaging a syringe plunger and a mechanical force applier attached to said bracket, said mechanical force applier being biased so that upon its release it withdraws the syringe plunger from within its receiving tube with a constant force.
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34-35. -35. (canceled)
- 40. A constant, controlled negative pressure syringe device for exerting a substantially constant negative pressure over substantially the entirety of a syringe excursion in its aspirating direction.
- 45. A syringe holder comprising a moveable handle for connection to a syringe butt end, a receiver for holding the syringe body, and a constant pressure spring extending between the handle and the holder arranged so that the spring is biased to aspirate the syringe.
Specification