Syringe with retractable needle
First Claim
1. A medical instrument comprising a needle and means for mounting said needle for movement between an extended operative position relative to said medical instrument where said needle is exposed for use and a retracted inoperative position where said needle is covered so as to reduce the likelihood of inadvertent contact with said needle;
- wherein said mounting means comprises support means, needle biasing means, and actuating means, said support means mounting said needle in said extended and retracted positions, said needle biasing means being interposed between said support means and said needle and normally urging said needle toward said retracted position, said actuating means being mounted on said support means for movement between inner and outer positions and adapted to be disposed to retain said needle at said extended position in said inner position of said actuating means, said actuating means further being adapted to be disposed out of engagement with said needle when said actuating means is moved toward said outer position to permit said needle biasing means to act on said needle thereby to force said needle to said retracted position;
said actuating means comprising engaging means adapted to be disposed to engage said needle, to retain said needle in said extended position in said inner position of said actuating means, said engaging means being further adapted to be disposed out of engagement with said needle when said actuating means is moved toward said outer position;
said mounting means further comprises actuator biasing means interposed between said actuating means and said support means, and normally urging said actuating means toward said inner position, such that said engaging means is in a position of interference with movement of said needle to said retracted position, said actuating means being adapted to be moved toward said outer position, against forces exerted thereon by said actuator biasing means, to dispose said engaging means out of a position, and wherein said actuating means being movable relative to said support means through a limited axial distance, there being stops provided on said actuating means to prevent it from moving further than said limited axial distance within said support means.
0 Assignments
0 Petitions
Accused Products
Abstract
A medical instrument comprises a needle which is movable between an extended operative position where the needle is exposed for use and a retracted inoperative position where the needle is covered so as to reduce the likelihood of inadvertent contact with the needle. The instrument also includes a needle biasing means which normally urges the needle toward its retracted position and an actuator movable between a position of interference with movement of the needle to its retracted position and a position out of interference with the needle to permit the needle biasing means to act on the needle and urge the same toward its retracted position.
-
Citations
17 Claims
-
1. A medical instrument comprising a needle and means for mounting said needle for movement between an extended operative position relative to said medical instrument where said needle is exposed for use and a retracted inoperative position where said needle is covered so as to reduce the likelihood of inadvertent contact with said needle;
-
wherein said mounting means comprises support means, needle biasing means, and actuating means, said support means mounting said needle in said extended and retracted positions, said needle biasing means being interposed between said support means and said needle and normally urging said needle toward said retracted position, said actuating means being mounted on said support means for movement between inner and outer positions and adapted to be disposed to retain said needle at said extended position in said inner position of said actuating means, said actuating means further being adapted to be disposed out of engagement with said needle when said actuating means is moved toward said outer position to permit said needle biasing means to act on said needle thereby to force said needle to said retracted position; said actuating means comprising engaging means adapted to be disposed to engage said needle, to retain said needle in said extended position in said inner position of said actuating means, said engaging means being further adapted to be disposed out of engagement with said needle when said actuating means is moved toward said outer position; said mounting means further comprises actuator biasing means interposed between said actuating means and said support means, and normally urging said actuating means toward said inner position, such that said engaging means is in a position of interference with movement of said needle to said retracted position, said actuating means being adapted to be moved toward said outer position, against forces exerted thereon by said actuator biasing means, to dispose said engaging means out of a position, and wherein said actuating means being movable relative to said support means through a limited axial distance, there being stops provided on said actuating means to prevent it from moving further than said limited axial distance within said support means. - View Dependent Claims (2, 3, 4)
-
-
5. A medical instrument comprising a needle and means for mounting said needle for movement between an extended operative position relative to said medical instrument where said needle is exposed for use and a retracted inoperative position where said needle is covered so as to reduce the likelihood of inadvertent contact with said needle;
-
wherein said mounting means comprises support means, needle biasing means, and actuating means, said support means mounting said needle in said extended and retracted positions, said needle biasing means being interposed between said support means and said needle and normally urging said needle toward said retracted position, said actuating means being mounted on said support means for movement between inner and outer positions and adapted to be disposed to retain said needle at said extended position in said inner position of said actuating means, said actuating means further being adapted to be disposed out of engagement with said needle when said actuating means is moved toward said outer position to permit said needle biasing means to act on said needle thereby to force said needle to said retracted position; said actuating means comprises engaging means adapted to be disposed to engage said needle, to retain said needle in said extended position in said inner position of said actuating means, said engaging means being further adapted to be disposed out of engagement with said needle when said actuating means is moved toward said outer position; said needle comprises a first abutment member, said needle biasing means comprising a first coil spring interposed between said abutment member and said support means, said engaging means being adapted to be disposed to engage said abutment member to retain said needle in said extended position in said inner position of said actuating means and to be disposed out of engagement with said abutment member to permit said first coil spring to act on said abutment member to move said needle to said retracted position when said actuating means is moved toward said outer position; first retaining means interconnecting said support means, said first coil spring and said abutment member to secure said needle relative to said support means in said retracted position of said needle; said support means comprises a first bore therethrough and a first inner wall defining said first bore, said needle being set in registry with said first bore, said abutment member comprising a first collar mounted on said needle, said first coil spring being in registry with said first bore in circumferential relationship to said needle and further being interposed between said first inner wall and said first collar, said engaging means being adapted to be disposed to engage said first collar to retain said needle in said extended position in said inner position of said actuating means to be disposed out of engagement with said first collar to permit said first coil spring to act on said abutment member to move said needle to said retracted position when said actuating means is moved toward said outer position. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification