Pump system
The invention relates to shielded reciprocating surgical file system for precisely removing bone and/or other tissue material. The system allows a user to maneuver the system and navigate into hard to access sites under a direct vision mechanism included in the system. A transmission mechanism converts rotary motion from a motor into reciprocating motion and provides it to the surgical file for precision bone and/or tissue removal. A pulsatile pump mechanism is operatively coupled with the transmission mechanism and provides irrigating fluid to the surgical site.
1 . A pump comprising:
a fluid path;
two plungers configured to at least partially occlude said fluid path;
a cam configured to cause said two plungers to at least partially occlude said fluid path alternatingly; and
at least one check valve along said fluid path for reducing backflow of fluid within said fluid path.
2 . The pump of claim 1 , wherein the cam translates in a direction that is substantially perpendicular to a long axis of at least one of said two plungers.
3 . The pump of claim 2 , wherein the cam translates in a direction that is substantially perpendicular to a long axis of each of said two plungers.
4 . The pump of claim 1 , wherein the pump is mechanically coupled to a transmission that converts rotary motion to reciprocating, linear motion.
5 . The pump of claim 4 , wherein the transmission comprises:
two surfaces that are a substantially fixed distance apart;
a cam that rotates about a central axis, said central axis being at an angle to a plane extending between the two surfaces; and
the cam having a curvilinear body, the body having a nonuniform thickness, wherein the body continuously contacts the two surfaces as the cam rotates about the central axis, such that the two surfaces remain at the substantially fixed distance apart as they move linearly in response to the cam's rotation about the central axis.
6 . A pump comprising:
a fluid path;
two plungers configured to at least partially occlude said fluid path;
means for causing said two plungers to at least partially occlude said fluid path alternatingly; and
at least one check valve along said fluid path for reducing backflow of fluid within said fluid path.
7 . The pump of claim 6 , wherein said means translates in a direction that is substantially perpendicular to a long axis of each of said two plungers.
8 . The pump of claim 6 , wherein said means translates in a direction that is substantially perpendicular to a long axis of at least one of said two plungers.