Manually actuated, implantable device to sequentially feed doses of a substance, in particular a therapeutant
First Claim
1. A manually actuated, sequential feed device for implantation in an accessible subcutaneous region for sequentially feeding liquid doses comprising a reservoir (1) having a capacity of plural doses, a filling site (2) for the reservoir and including a filling chamber (8), a septum (7) for injecting a liquid into said chamber and communication means (9) between the filling chamber and the reservoir, and a manual pump (3) having a volume chamber (13) the capacity of which corresponds to one dose, first communication means (15) between the reservoir and said chamber for filling said chamber and second communication means (16) between said volume chamber and an external catheter (20), said reservoir comprising a flexible pouch (1) having a first external wall (1a) and a second, internal wall (1b) opposite said first wall and impermeably bonded to each other along the edges thereof, said manual pump including an integral rigid body (10) having a concave recess (11) opening toward an active side of said body in order to form said volume chamber (13), and placed between said flexible walls (1a, 1b) of said reservoir, said pump further including on its active side an expulsion membrane (12) for sealing the volume chamber and located on the side of the external flexible wall (1a), and fastened by its opposite side to the internal flexible wall, said second communication means including a one-way valve (18) with a pressure threshold designed to open the communication between the chamber and the catheter when the chamber is subjected to an excess pressure higher than a given threshold Pc, said first communication means including a check valve (21) preventing the liquid from flowing back from the chamber into the reservoir, and a safety valve (17) designed to allow gravity draining the reservoir into the volume chamber and closing off the communication if the excess pressure in the reservoir exceeds a value Fr less than or equal to Pc.
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Accused Products
Abstract
The invention concerns a sequential and manually actuated feed device for implantation in an accessible subcutaneous region of a patient for the purpose of sequentially dosing a liquid, in particular a therapeutant. This device comprises a reservoir consisting of a flexible pouch, a filling site (2) located at the rim of said pouch in order to inject the liquid into it, and a manual pump (3) located in the opposite zone of the pouch in order to supply the liquid dose by dose to a catheter (20). The pump has a rigid case with a recess and bearing an expulsion membrane so as to bound a volume chamber; safety means prevent any accidental injection in the event of a spurious pressure exerted on the flexible pouch.
104 Citations
21 Claims
- 1. A manually actuated, sequential feed device for implantation in an accessible subcutaneous region for sequentially feeding liquid doses comprising a reservoir (1) having a capacity of plural doses, a filling site (2) for the reservoir and including a filling chamber (8), a septum (7) for injecting a liquid into said chamber and communication means (9) between the filling chamber and the reservoir, and a manual pump (3) having a volume chamber (13) the capacity of which corresponds to one dose, first communication means (15) between the reservoir and said chamber for filling said chamber and second communication means (16) between said volume chamber and an external catheter (20), said reservoir comprising a flexible pouch (1) having a first external wall (1a) and a second, internal wall (1b) opposite said first wall and impermeably bonded to each other along the edges thereof, said manual pump including an integral rigid body (10) having a concave recess (11) opening toward an active side of said body in order to form said volume chamber (13), and placed between said flexible walls (1a, 1b) of said reservoir, said pump further including on its active side an expulsion membrane (12) for sealing the volume chamber and located on the side of the external flexible wall (1a), and fastened by its opposite side to the internal flexible wall, said second communication means including a one-way valve (18) with a pressure threshold designed to open the communication between the chamber and the catheter when the chamber is subjected to an excess pressure higher than a given threshold Pc, said first communication means including a check valve (21) preventing the liquid from flowing back from the chamber into the reservoir, and a safety valve (17) designed to allow gravity draining the reservoir into the volume chamber and closing off the communication if the excess pressure in the reservoir exceeds a value Fr less than or equal to Pc.
Specification