Split nut for injector
First Claim
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1. Apparatus for injecting fluid into a patient at an average prescribed rate over a prolonged period of time comprising:
- a housing;
carriage means defining a fluid chamber therein carrying fluid to be dispensed and an outlet from said fluid chamber connected to the patient, said carriage means defining a nut receiving opening thereon having a prescribed size and shape and including a piston slidably mounted in said fluid chamber for forcing fluid from said outlet as said piston is moved toward said outlet;
connection means for removably attaching said carriage means to said housing;
an externally threaded drive member defining an outboard end thereon adapted to engage said piston;
an internally threaded split nut unit mounted on said housing and selectively movable between a closed position threadedly engaging said externally threaded drive member and an open position threadedly disengaging said externally threaded drive member, said internally threaded split nut unit having an external size and shape and located with respect to said connection means such that, when said split nut unit is in its closed position threadedly engaging said drive member, said nut receiving opening in said carriage means will just be received over said split nut unit and said connection means maintains said carriage means over said split nut unit while said carriage means is attached to said housing to keep said split nut unit in its closed position;
driving means operatively connected to said externally threaded drive member for selectively rotating said drive member with respect to said split nut unit to cause said drive member to axially move with respect to said split nut unit and to cause the outboard end of said drive member to engage and move said piston toward said outlet and force fluid out of said outlet.
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Abstract
Method and apparatus for injecting fluids into patients at a controlled rate from an ampule containing the injecting fluid with a sliding piston therein to force the fluid from the ampule into the patient using a drive system which incrementally and successively advances the piston in the ampule to meter the fluid into the patient.
98 Citations
5 Claims
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1. Apparatus for injecting fluid into a patient at an average prescribed rate over a prolonged period of time comprising:
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a housing; carriage means defining a fluid chamber therein carrying fluid to be dispensed and an outlet from said fluid chamber connected to the patient, said carriage means defining a nut receiving opening thereon having a prescribed size and shape and including a piston slidably mounted in said fluid chamber for forcing fluid from said outlet as said piston is moved toward said outlet; connection means for removably attaching said carriage means to said housing; an externally threaded drive member defining an outboard end thereon adapted to engage said piston; an internally threaded split nut unit mounted on said housing and selectively movable between a closed position threadedly engaging said externally threaded drive member and an open position threadedly disengaging said externally threaded drive member, said internally threaded split nut unit having an external size and shape and located with respect to said connection means such that, when said split nut unit is in its closed position threadedly engaging said drive member, said nut receiving opening in said carriage means will just be received over said split nut unit and said connection means maintains said carriage means over said split nut unit while said carriage means is attached to said housing to keep said split nut unit in its closed position; driving means operatively connected to said externally threaded drive member for selectively rotating said drive member with respect to said split nut unit to cause said drive member to axially move with respect to said split nut unit and to cause the outboard end of said drive member to engage and move said piston toward said outlet and force fluid out of said outlet. - View Dependent Claims (2, 3, 4, 5)
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Specification