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The automatically controlled pump includes a battery-powered motor with a housing, a pump in a housing with input and output ports. A switch turns ON and OFF the motor due to fluid pressure at the output, Sometimes, the pump housing is below the motor housing and below the battery housing. The input

The automatically controlled pump includes a battery-powered motor with a housing, a pump in a housing with input and output ports. A switch turns ON and OFF the motor due to fluid pressure at the output, Sometimes, the pump housing is below the motor housing and below the battery housing. The input port is beneath the impeller and the output port. A version also includes a manual ON aid OFF switch actuated by an operator and a check valve limiting upstream flow of the pressurized fluid. The fluid pressure sensitive switch is mounted downstream of the check valve. An irrigation surgical kit includes the automatically controlled pump, a spike for a fluid source bag, fluid lines and an operator controlled valve unit disposed at or near the surgical site. The method monitors fluid pressure at or near the pump's output and turns ON and OFF the motor.

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The automatically controlled pump includes a battery-powered motor with a housing, a pump in a housing with input and output ports. A switch turns ON and OFF the motor due to fluid pressure at the output, Sometimes, the pump housing is below the motor housing and below the battery housing. The input

The automatically controlled pump includes a battery-powered motor with a housing, a pump in a housing with input and output ports. A switch turns ON and OFF the motor due to fluid pressure at the output, Sometimes, the pump housing is below the motor housing and below the battery housing. The input port is beneath the impeller and the output port. A version also includes a manual ON aid OFF switch actuated by an operator and a check valve limiting upstream flow of the pressurized fluid. The fluid pressure sensitive switch is mounted downstream of the check valve. An irrigation surgical kit includes the automatically controlled pump, a spike for a fluid source bag, fluid lines and an operator controlled valve unit disposed at or near the surgical site. The method monitors fluid pressure at or near the pump's output and turns ON and OFF the motor. tab to slide therealong, a second stop, which protrudes into said second open area and which is positioned adjacent said fourth ramp, and locking means, positioned so as to be engageable by said first tab, for locking said barrel in its said retracted position such that said needle is concealed in said housing. 2. The improved safety syringe of claim 1, wherein said urging means is a compression spring mounted about said barrel such that a substantial portion of said compression spring is located externally of said housing when said barrel is in its said retracted position. 3. The improved safety syringe of claim 2, wherein said barrel includes a flange positioned at said proximal end thereof, said compression spring extending between said flange and said distal end of said barrel. 4. The improved safety syringe of claim 1, further including a plunger mounted for reciprocating movement within said barrel so as to move said barrel to its said extended position. 5. The improved safety syringe of claim 1, wherein said locking means includes a V-shaped notch protruding outwardly from said first open area, said V-shaped notch being sized and shaped so as to preclude lateral movement of said first tab. 6. The improved safety syringe of claim 1, wherein said second raised segment includes guiding means for guiding said first tab into said second groove. 7. The improved safety syringe of claim 6, wherein said guiding means includes a lock ramp, which protrudes into said first open area and which is positioned adjacent said first stop. 8. The improved safety syringe of claim 1, wherein said first raised segment further includes a third stop formed adjacent one side of said first open area. 9. The improved safety syringe of claim 8, wherein said first ramp of said first raised segment is located proximate said distal end of said housing and wherein said second ramp and said first stop are located intermediate said first ramp and said proximal end of said housing. 10. The improved safety syringe of claim 9, wherein each of said third ramp, said fourth ramp, and said second stop is located proximate said distal end of said housing. 11. The improved safety syringe of claim 10, wherein said ring rotates relative to said housing when said first tab slides along said first ramp and said second tab slides along said third ramp, and wherein said ring stops rotating relative to said housing when said second tab engages said second stop after sliding along said third ramp. 12. The improved safety syringe of claim 11, wherein said first tab is axially aligned with said second ramp of said second raised segment when said second tab engages said second stop. 13. The improved safety syringe of claim 12, wherein said urging means urges said first tab to axially engage said second ramp of said second raised segment. 14. The improved safety syringe of claim 13, wherein said ring rotates relative to said housing when said first tab slides along said second ramp of said second raised segment, and wherein said ring stops rotating relative to said housing when said first tab engages said first stop after sliding along said second ramp. 15. The improved safety syringe of claim 14, wherein said second tab is axially aligned with said fourth ramp of said first raised segment when said first tab engages said first stop. 16. The improved safety syringe of claim 15, wherein said first tab is axially aligned with said second groove and said ring is rotated relative to said housing when said second tab slides along said fourth ramp of said first raised segment. 17. In a safety syringe which includes a housing having a bore which extends from a distal end of said housing to a proximal end of said housing; a barrel having a distal end located in said housing and a proximal end located externally of said housing, said barrel being mounted for reciprocating movement within said housing such that said barrel is movable between a retracted position, in which said distal end of said barrel is located proximate said proximal end of said housing, and an extended position, in which said distal end of said barrel is located proximate said distal end of said housing; a needle assembly attached to said barrel at said distal end thereof, said needle assembly having a needle attached thereto; a ring mounted to said barrel about said distal end thereof, said ring being rotatable relative to said housing and to said barrel and including a first tab and a second tab circumferentially spaced from said first tab; and urging means for urging said barrel toward its said retracted position, the improvement wherein said housing has an interior wall which includes first ramp means, positioned so as to be engageable by said first tab, for rotating said ring relative to said housing responsive to the engagement of said first ramp means by said first tab; second ramp means, positioned so as to be engageable by said first tab, for rotating said ring relative to said housing responsive to the engagement of said second ramp means by said first tab; first stop means, positioned so as to be engageable by said first tab, for stopping the rotation of said ring relative to said housing responsive to the engagement of said first stop means by said first tab; third ramp means, positioned so as to be engageable by said second tab, for rotating said ring relative to said housing responsive to the engagement of said third ramp means by said second tab; second stop means, positioned so as to be engageable by said second tab, for stopping the rotation of said ring relative to said housing responsive to the engagement of said second stop means by said second tab; fourth ramp means, positioned so as to be engageable by said second tab, for rotating said ring relative to said housing responsive to the engagement of said fourth ramp means by said second tab; third stop means, positioned so as to be engageable by said first tab, for stopping the rotation of said ring relative to said housing responsive to the engagement of said third stop means by said first tab; and locking means, positioned so as to be engageable by said first tab, for locking said barrel in its said retracted position responsive to the engagement of said locking means by said first tab such that said needle is concealed in said housing. 18. The improved safety syringe of claim 17, wherein said urging means is a compression spring mounted about said barrel such that a substantial portion of said compression spring is located externally of said housing when said barrel is in its said retracted position. 19. The improved safety syringe of claim 18, wherein said barrel includes a flange positioned at said proximal end thereof, said compression spring extending between said flange and said distal end of said barrel. 20. The improved safety syringe of claim 17, further including a plunger mounted for reciprocating movement within said barrel so as to move said barrel to its said extended position. 21. The improved safety syringe of claim 17, wherein said locking means includes a V-shaped notch which is sized and shaped so as to preclude lateral movement of said first tab. 22. The improved safety syringe of claim 17, wherein said interior wall of said housing further includes guiding means for guiding said first tab toward said proximal end of said housing. 23. The improved safety syringe of claim 22, wherein said guiding means includes a lock ramp positioned adjacent said first linear edge. 24. The improved safety syringe of claim 17, wherein said first ramp means is a first angled surface which is sized and shaped so as to allow said first tab to slide therealong. 25. The improved safety syringe of claim 24, wherein said second ramp means is an inclined edge which is sized and shaped so as to allow said first tab to slide therealong. 26. The improved safety syringe of claim 25, wherein said first stop means is a linear edge positioned adjacent said inclined edge. 27. T