Needle apparatus
OwnerDean B. Prestidge, Maxwell E. Whissoninventors
Life of this patent
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Abstract
A needle apparatus has a thin walled catheter enclosing a tubular needle having a sharp point, the catheter and the needle being relatively moveable longitudinally a short distance, from a first position where the needle projects from the catheter and to a second position at which the sharp point is located within the catheter. The needle remains in the fluid pathway of the needle apparatus at all times. The needle apparatus is arranged to pierce tissue when the catheter and the needle are in the first position.
Claims21
A needle apparatus comprising a thin walled catheter having a free end closely enclosing a tubular needle having a sharp point, characterised in that the needle and/or the catheter is mounted to a housing and the needle and the catheter are longitudinally moveable relative to one another between a first position at which the needle extends from the catheter a short distance and a second position at which the sharp point is located within the catheter adjacent the free end thereof, the needle remaining in a fluid pathway of the needle apparatus at all times, first means for positively retaining the needle and the catheter in the first position, the first means includes a manually operable catch member which upon actuation by a user releases the needle and the catheter to move relatively to the second position, second means for moving the needle relative to the catheter to the second position upon release of the catch member, and the needle apparatus being arranged to pierce tissue when the catheter and the needle are in the first position.
A needle apparatus comprising a thin walled catheter having a free end closely enclosing a tubular needle having a sharp point, characterised in that the needle and the catheter are longitudinally moveable relative to one another between a first position at which the needle extends from the catheter a short distance and a second position at which the sharp point is located within the catheter adjacent the free end thereof, the needle remaining in the fluid pathway of the needle apparatus at all times, means being provided for positively retaining the needle and the catheter in the first position including a catch member which upon release enables the needle and the catheter to move to the second position, the needle apparatus being arranged to pierce tissue when the catheter and the needle are in the first position, wherein the needle has a rearward end containing an aperture and having a further sharp point arranged to pierce a barrier member in the housing when the catheter and the needle move to the second position so as to establish fluid communication with a chamber which contains or is arranged to contain fluid.
A needle apparatus comprising a thin walled catheter having a free end closely enclosing a tubular needle having a sharp point, characterised in that the needle and the catheter are longitudinally moveable relative to one another between a first position at which the needle extends from the catheter a short distance and a second position at which the sharp point is located within the catheter adjacent the free end thereof, the needle remaining in fluid pathway of the needle apparatus at all times, means being provided for positively retaining the needle and the catheter in the first position including a catch member which upon release enables the needle and the catheter to move to the second position, the needle apparatus being arranged to pierce tissue when the catheter and the needle are in the first position, means being provided for positively retaining the needle and the catheter in the first position wherein the apparatus includes a housing having a flexible wall portion which upon a change in internal pressure of the housing moves laterally to act as the catch member to enable the catheter and the needle to move to the second position.
Dependencies are inferred from the claim text.