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公开(公告)号：JPH0854267A
公开(公告)日：1996-02-27
申请号：JP14778095
申请日：1995-06-14
Applicant: MINIMED INC
Inventor： CHIYADO SURISATAPATO , POORU EI IEETSU
Abstract: PURPOSE: To provide a means to monitor and recognize real dosage situation of a selected medicine to a patient in accordance with action of an injector type injection pump, or especially a distribution pump. CONSTITUTION: An injection pump to dose a selected medicine is provided with an inductance flow sensor 18 to monitor and recognize dosage of the medicine in accordance with pump action. The flow sensor 18 is provided with a compact coil 50 wound around a pump discharge tube, and it is combined with a core pin 38 attracted by magnetic force disposed inside the discharge tube, so the core pin 38 moves inside the inductor coil 50 in accordance with discharge from the pump. A control circuit is actuated by the minimum power required to recognize change of coil inductance generated as a result of displacement of the core pin 38 for recognizing dosage of the medicine to a patient in accordance with actuation of the pump. In a pump discharge condition, a magnet 40 provided at one end of the inductor coil 50 pulls the core pin 38, and the core pin 38 is maintained where it is puled from the coil 50.
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公开(公告)号：JPH0852222A
公开(公告)日：1996-02-27
申请号：JP14704895
申请日：1995-06-14
Applicant: MINIMED INC
Inventor： CHIYADO SURISATAPATO , BUIROOTE INDORABUYUUDO
Abstract: PURPOSE: To prevent a complete phase shift from a pressure fluid to its liquid state by providing such a structure that the pressure fluid will expand and contract the volume of a pressure reservoir in response to the amount of medication within a medication chamber and undergoes a phase shift from liquid to vapor which is sufficient to maintain the medication under a certain pressure. CONSTITUTION: When an injection pump 10 receives a certain amount of medication and reserve it in its internal medication chamber 12, the medication is under a virtually constant predetermined pressure due to the use of an improved and simplified pressure reservoir 14 loaded with a certain pressure liquid in a mixed state of liquid and vapor. A spacer element 15 serves to prevent a complete phase shift of the pressure fluid to a liquid phase. The injection pump 10 has within its pump housing 16 the pressure reservoir 14 the volume of which can be altered. The wall of the pressure reservoir 14 is exposed to the medication chamber 12 and makes up a part of the chamber 12. The fluid in a liquid/ solid state within the pressure reservoir 14 will alter the volume of the medication chamber 12 in response to the amount of medication within the chamber 12.
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公开(公告)号：JPH0838594A
公开(公告)日：1996-02-13
申请号：JP7787495
申请日：1995-04-03
Applicant: MINIMED INC
Inventor： CHIYADO SURISATAPATO , BUIROOTE INDORABUYUUDO
Abstract: PURPOSE: To provide a medication infusion pump which is implantable in a patient's body and which is of a kind as to send selected medications through a catheter to the patient in a programmable way over a long period of time. CONSTITUTION: A side port assembly body 28 is attached to a pump 10 quickly and simply and the assembly body 28 forms a flow path to release medications to a catheter 18. The side port assembly body 28 has a backflow stop valve 84 to prevent a backflow in the discharge flow path and an access port 20 accommodating access of an injection syringe into the discharge flow path. The discharge side access port 20 can be used to rinse and wash off the residual substances from the catheter 18 or can be used together with a refillable main port 22 which washes the pump 10 and/or which is to determine the actual pump stroke capacity.
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