摘要:
An implantable positive pressure medication infusion device is provided which is programmable over a wide dynamic range and yet the maximum flow of medication into the body, in the event the inlet valve of the device leaks or fails in the valve open position, is limited to a safe value which is much lower than the maximum programmable infusion rate of the device. An auxiliary flow restrictor is also provided which bypasses the programmable pumping unit and assures a minimum flow of medication into the body in the event of failure of the programmable pumping unit or its electronic drive. An arrangement is also provided for detecting catheter clogging or failure of the programmable pumping unit in either a positive or negative pressure device.
摘要:
An integral fluid filter and capillary restrictor unit (40), or alternatively an integral fluid filter and multiple orifice restrictor unit, is resiliently positioned in a manifold body (22) which is edge mounted to a flat cylindrical assembly which contains the medication reservoir (18) and pressure stabilizing chamber (20) to provide a completely self- contained implantable unit which is thin, small and lightweight and yet needs to be refilled only as often as the much larger stainless steel capillary tube devices with bellows type reservoirs now on the market.
摘要:
An implantable positive pressure medication infusion device is provided which is programmable over a wide dynamic range and yet the maximum flow of medication into the body, in the event the inlet valve of the device leaks or fails in the valve open position, is limited to a safe value which is much lower than the maximum programmable infusion rate of the device. An auxiliary flow restrictor is also provided which bypasses the programmable pumping unit and assures a minimum flow of medication into the body in the event of failure of the programmable pumping unit or its electronic drive. An arrangement is also provided for detecting catheter clogging or failure of the programmable pumping unit in either a positive or negative pressure device.
摘要:
An implantable medication infusion unit wherein a generally cylindrical manifold (20) is employed having a shallow recess (28) on one face thereof. A flexible diaphragm (26) is positioned to form with the face of said manifold a medication reservoir (30). A circular cover member (24) is positioned over the diaphragm to form with said diaphragm a pressure stabilizing chamber (32) within which is positioned a two-phase fluid for maintaining a constant pressure on said diaphragm. A permanent magnet (42) is positioned at the center of said diaphragm and is movable therewith. A Hall effect transducer (34) positioned on said manifold opposite said permanent magnet is employed continuously to measure the position of said diaphragm and provide an indication of the amount of medication in said reservoir (30). A method of filling and sealing the pressure stabilizing chamber (32) which ensures that a small bubble of two-phase fluid is present in said chamber at all times. An inlet filter (100) may be positioned between the medication reservoir (30) and an inlet check valve (102) to act as a bubble trap during the intake stroke of a pulsatile pumping unit also mounted in the manifold.
摘要:
An implantable medication infusion unit wherein a generally cylindrical manifold (20) is employed having a shallow recess (28) on one face thereof. A flexible diaphragm (26) is positioned to form with the face of said manifold a medication reservoir (30). A circular cover member (24) is positioned over the diaphragm to form with said diaphragm a pressure stabilizing chamber (32) within which is positioned a two-phase fluid for maintaining a constant pressure on said diaphragm. A permanent magnet (42) is positioned at the center of said diaphragm and is movable therewith. A Hall effect transducer (34) positioned on said manifold opposite said permanent magnet is employed continuously to measure the position of said diaphragm and provide an indication of the amount of medication in said reservoir (30). A method of filling and sealing the pressure stabilizing chamber (32) which ensures that a small bubble of two-phase fluid is present in said chamber at all times. An inlet filter (100) may be positioned between the medication reservoir (30) and an inlet check valve (102) to act as a bubble trap during the intake stroke of a pulsatile pumping unit also mounted in the manifold.
摘要:
A precision medication dispensing system comprising an implantable device (10). The device includes a medication reservoir (12), a pulsatile pump (24) and an absolute pressure transducer (70). The pumping pressure wave developed in the pumping chamber (60) is measured by the absolute pressure transducer (70) whose output is used to adjust the pulsing rate of the solenoid operated pump (24) so that the programmed time averaged rate of infusion of medication into the body is precisely maintained throughout all operating temperature and pressure conditions.
摘要:
An integral fluid filter and capillary restrictor unit (40), or alternatively an integral fluid filter and multiple orifice restrictor unit, is resiliently positioned in a manifold body (22) which is edge mounted to a flat cylindrical assembly which contains the medication reservoir (18) and pressure stabilizing chamber (20) to provide a completely self- contained implantable unit which is thin, small and lightweight and yet needs to be refilled only as often as the much larger stainless steel capillary tube devices with bellows type reservoirs now on the market.