Disposable hypodermic syringe with retractable needle
AssigneeDesign Specialties Laboratories, Inc.
InventorJames J. Lennox
Life of this patent
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Abstract
A disposable hypodermic syringe capable of use only one time and including a needle which is automatically retracted within a tubular housing after use to prevent accidental needle sticks. The needle is normally locked in an extended position for normal injection use but then is automatically released through a release mechanism actuated by the same forward movement of the plunger within the syringe as is used to normally dispense the fluid from the syringe.
Claims12
A syringe for one-time use comprising tubular means including a rearward tubular section having a first open end and a forward tubular section extending forwardly from said rearward section and including a second closed end, needle means slidably mounted through said closed end for movement from a first position in which it extends beyond said closed end and a second position in which it is retracted within said tubular means, locking means for locking said needle means in said first position, bias means for urging said needle means from said first position to said second position, plunger means mounted in said rearward tubular section and forwardly displaceable toward said second end to dispense fluid contained in said tubular means through said needle means into a patient, release means responsive to forward movement of said plunger means to automatically release said locking means and cause said bias means to move said needle means to said second position, said release means including tubular actuator means separate from said plunger means and movably mounted within said forward tubular section from a rearward position to a forward position in which it releases said locking means, said tubular actuator means having rear abutment means engagable by said plunger means toward the end of its stroke and moved by said plunger means from said rearward position to said forward postion as forward displacement of said plunger means is continued for a short distance.
A needle assembly for attachment to a syringe body containing a fluid and having a plunger therein displaceable in a forward direction to dispense the fluid from an open forward end thereof, said needle assembly comprising tubular means having a first open end adapted to be connected to the forward end of said body and a second closed end, needle means slidably mounted through said closed end for movement from a first position in which it extends beyond said closed end and a second position in which it is retracted within said tubular means, locking means for locking said needle means in said first position, bias means for urging said needle means from said first position to said second position, release means including tubular actuator means separate from said plunger and movably mounted within said tubular means from a rearward position to a forward position in which it releases said locking means, said actuator means having rear abutment means adapted to extend into the syringe body and be engaged by said plunger toward the end of its stroke and moved by said plunger from said rearward position to said forward position as forward displacement of said plunger is continued for a short distance.
A syringe for one-time use comprising tubular means including a rearward tubular section having a first open end and a forward tubular section extending forwardly from said rearward section and including a second closed end, needle means slidably mounted through said closed end for movement from a first position in which it extends beyond said closed end and a second position in which it is retracted within said tubular means, locking means for locking said needle means in said first position, bias means for urging said needle means from said first position to said second position, plunger means mounted in said rearward tubular section and forwardly displaceable toward said second end to dispense fluid contained in said tubular means through said needle means into a patient, release means responsive to forward movement of said plunger means to automatically releases said locking means and cause said bias means to move said needle means to said second position, said release means including tubular actuator means movably mounted within said forward tubular section from a rearward position to a forward position in which it releases said locking means, said tubular actuator means having rear abutment means engagable by said plunger means toward the end of its stroke and moved by said plunger means from said rearward position to said forward position as forward displacement of said plunger means is continued for a short distance, said locking means including expansible collet means having a closed condition in which it holds said needle means in its first extended position and an expanded condition in which it releases said needle means, said tubular actuator means including chuck means associated with said collet means to release said collet means upon forward movement of said tubular actuator means by said plunger means.
A needle assembly for attachment to a syringe body containing a fluid and having a plunger therein displaceable in a forward direction to dispense the fluid from an open forward end thereof, said needle assembly comprising tubular means having a first open end adapted to be connected to the forward end of said body and a second closed end, needle means slidably mounted through said closed end for movement from a first position in which it extends beyond said closed end and a second position in which it is retracted within said tubular means, locking means for locking said needle means in said first position, bias means for urging said needle means from said first position to said second position, release means including tubular actuator means movably mounted within said tubular means from a rearward position to a forward position in which it releases said locking means, said tubular actuator means having rear abutment means adapted to extend into the syringe body and be engaged and moved by said plunger from said rearward position to said forward position as said plunger moves in its forward direction, said locking means including expansible collet means having a closed condition in which it holds said needle means in its first extended position and an expanded condition in which it releases said needle means, said tubular actuator means including chuck means associated with said collet means to release said collet means upon forward movement of said tubular actuator means by said plunger.
Dependencies are inferred from the claim text.