Infusate injection apparatus

Claim 2

Apparatus for injecting infusate percutaneously through a septum into an infusate chamber implanted in a body comprising: A. a housing, B. a needle projecting from the housing, said needle having a longitudinal passage, C. means for slidably mounting the needle in the housing so that it is movable between an extended positon and a retracted position, D. means for biasing the needle toward its extended position, E. means for conducting fluid into the housing, and F. valve means in the housing for controlling the flow of fluid from the housing into the needle, said valve means being closed when the needle is in its extended position and said valve means being open when the needle is in its retracted position whereby fluid infusate cannot flow through the needle unless the exposed end of the needle bottoms against a stop in the chamber thereby facilitating moving the needle to its retracted position, said valve means comprising: 1. a transverse passage through the needle near its inner end, said transverse passage intercepting the longitudinal passage through the needle, and 2.

Claim 3

a resilient seal mounted in the housing so as to cover the ends of said transverse passage when the needle is in its extended position, the ends of said transverse passage being free of said seal when the needle is in

Claim 4

a resilient seal mounted in the housing so as to cover the ends of said transverse passage when the needle is in its extended position, the ends of said transverse passage being free of said seal when the needle is in

Claim 5

its retracted position. 2. Apparatus for injecting infusate percutaneously through the septum of a fluid reservoir of a device implanted in a body comprising: A. means in the implanted device inward of the septum defining a chamber, B. a needle stop positioned at the inner end of the chamber, C. a housing, D. a hollow needle projecting from the housing, said needle having a longitudinal passage closed at both ends, E. means for slidably mounting the needle in the housing so that the needle is movable between an extended position and a retracted position, F. means for biasing the needle towards its extended position, and G. transverse passages extending through the needle near its ends, said passage intercepting said longitudinal passage, and H. annular sealing means mounted in the housing so as to engage around the inner end of the needle and cover the transverse passage when the needle is in its extended position, said transverse passage being retracted from and free of the sealing means when the needle is moved toward its retracted position whereby when the needle is injected through the septum and engages the needle stop inside the implanted device, the needle is set back to its retracted position thereby exposing the transverse passage so that fluid introduced into the housing can enter the needle and be discharged from its outer end into the chamber and when the apparatus is retracted away from the needle stop, the needle is moved toward its extended position so that the transverse passage is closed by said sealing means whereby that fluid cannot be discharged inadvertently inside the body exteriorly of the implanted device.

Claim 6

its retracted position. 2. Apparatus for injecting infusate percutaneously through the septum of a fluid reservoir of a device implanted in a body comprising: A. means in the implanted device inward of the septum defining a chamber, B. a needle stop positioned at the inner end of the chamber, C. a housing, D. a hollow needle projecting from the housing, said needle having a longitudinal passage closed at both ends, E. means for slidably mounting the needle in the housing so that the needle is movable between an extended position and a retracted position, F. means for biasing the needle towards its extended position, and G. transverse passages extending through the needle near its ends, said passage intercepting said longitudinal passage, and H. annular sealing means mounted in the housing so as to engage around the inner end of the needle and cover the transverse passage when the needle is in its extended position, said transverse passage being retracted from and free of the sealing means when the needle is moved toward its retracted position whereby when the needle is injected through the septum and engages the needle stop inside the implanted device, the needle is set back to its retracted position thereby exposing the transverse passage so that fluid introduced into the housing can enter the needle and be discharged from its outer end into the chamber and when the apparatus is retracted away from the needle stop, the needle is moved toward its extended position so that the transverse passage is closed by said sealing means whereby that fluid cannot be discharged inadvertently inside the body exteriorly of the implanted device.

Claim 7

Apparatus for injecting infusate percutaneously through a septum into an infusate chamber of a device implanted in a body comprising: A. a housing, B. a needle projecting from the housing, said needle having a longitudinal passage, C. means for slidably mounting the needle in the housing so that it is movable between an extended position and a retracted position, D. means for biasing the needle toward its extended position, E. means for conducting fluid into the housing, F. means in the implanted device inward of the septum defining a chamber, G. a needle stop positioned at the inner end of the chamber, and H. valve means in the housing for controlling the flow of fluid from the housing into the needle, said valve means being closed when the needle is in its extended position and said valve means being open when the needle is in its retracted position whereby when the needle is injected through the septum and engages the needle stop inside the implanted device, the needle is set back to its retracted position thereby opening the valve means so that fluid introduced into the housing can enter the needle and be discharged from its outer end into the chamber and when the apparatus is retracted away from the needle stop, the needle is moved towards its extended position so that the valve is closed whereby fluid cannot be discharged inadvertently inside the body exteriorly of the implanted device.

Claim 8

Apparatus for injecting infusate percutaneously through a septum into an infusate chamber of a device implanted in a body comprising: A. a housing, B. a needle projecting from the housing, said needle having a longitudinal passage, C. means for slidably mounting the needle in the housing so that it is movable between an extended position and a retracted position, D. means for biasing the needle toward its extended position, E. means for conducting fluid into the housing, F. means in the implanted device inward of the septum defining a chamber, G. a needle stop positioned at the inner end of the chamber, and H. valve means in the housing for controlling the flow of fluid from the housing into the needle, said valve means being closed when the needle is in its extended position and said valve means being open when the needle is in its retracted position whereby when the needle is injected through the septum and engages the needle stop inside the implanted device, the needle is set back to its retracted position thereby opening the valve means so that fluid introduced into the housing can enter the needle and be discharged from its outer end into the chamber and when the apparatus is retracted away from the needle stop, the needle is moved towards its extended position so that the valve is closed whereby fluid cannot be discharged inadvertently inside the body exteriorly of the implanted device.