Spring impelled syringe guide with skin penetration depth adjustment

Claim 1

A syringe guide for a syringe having a needle at an end thereof, said guide comprising: a hollow cylindrical body having a first end and a second end; a generally tubular base having one end slidably positioned in the first end of said body and an enlarged end face at the opposite end thereof for bearing against the skin of a user; screw adjustment means extending through said body and contacting said base for adjusting the position of said base in said body; a moveable cylindrical member having one end slidably positioned in the second end of said body, said movable cylindrical member being adapted for receiving a syringe therein; a spring mounted in an interior portion of said body adjacent the second end thereof and connected between said body and said movable cylindrical member for urging said movable cylindrical member in a longitudinal direction into said body; and locking and releasing means for maintaining said movable cylindrical member in a locked position in said body with the spring compressed and for releasing the spring so that the movable cylindrical member may move relative to the body for plunging a needle of a syringe into the skin of a user, said locking and releasing means comprising an abutment formed on an interior medial wall portion of said hollow cylindrical body and against which said movable cylindrical member bears when same is in the locked position, a pusher extending through a medial portion of said body opposite said abutment and urging said movable cylindrical member towards said abutment, and a finger extending through a medial portion of said body opposite said pusher and adjacent said abutment for moving said movable cylindrical member in a transverse direction relative to said abutment to thereby disengage said movable cylindrical member from said abutment.