Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-05-20
1995-06-20
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604121, 604 67, 128DIG12, A61M 100
Patent
active
054257166
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an infusion apparatus for injecting various types of medicinal solutions or blood into a human body by using a syringe type injection pump.
BACKGROUND ART
Infusion apparatuses, e.g., pumps, for automatically performing infusion by using syringes are conventionally known. A medicinal solution in a medicine bottle is drawn into the syringe through a needle. Alternatively, a medicine cartridge is stored in the syringe. After the syringe containing the medicinal solution is mounted on the pump, a syringe plunger is pushed by a slider of the pump at a constant rate, so that the infusion solution is automatically administered to the patient. Infusion apparatuses of this type are disclosed in JP-A-48-62289, JP-U-57-76637, and JP-B-63-443390.
In such an infusion apparatus, a medicinal solution or blood must be reliably injected at a predetermined flow rate to the patient without an abnormality. Thus, in the conventional infusion apparatus, a slider for pushing the plunger is controlled by using, e.g., a microcomputer system. In another conventional infusion apparatus, the supremum pressure at the needle is determined immediately before the medicinal solution is injected to the patient. The force to the plunger is then expected and calculated at the supremum. An alarm is produced or the operation of the pump is stopped when this supremum force is detected.
syringes used in the infusion apparatus are manufactured by various manufacturers. Their sizes or configurations are standardized to a certain degree. However, the syringes of different manufacturers have different inherent slidable or dynamic frictional resistance values. Accordingly, it needs various specification data, e.g., the slidable frictional resistance, stroke, and capacity of the syringes. The various specification data therefore can be stored by using an EPROM or the like. When data on the slidable frictional resistance of the syringe of a certain manufacturer is stored in the EPROM of one infusion apparatus, its apparatus adapts to that of the syringes according to the specifications of the manufacturer.
In the conventional infusion apparatus, however, even when the force to the plunger exceeds the supremum force to produce the alarm, sometimes no abnormality occurs. This is because injecting pressure changes are not considered, which depend on the viscosity of the medicinal solution, the needle gauge or size, and the injecting location (vein, artery or muscle) of the patient. More specifically, since the supremum force is set according to a medicinal solution having a low viscosity, it does not correspond to a high-calorie medicinal solution having a high viscosity that attracts attention lately. Also, the supremum force does not correspond to a reaction against the injecting pressure when a needle having a small gauge and thus a large pressure loss is used, and when injection into an artery is performed, which are influenced by the blood pressure. In a worst case, when the patient takes a sudden turn for the worse and the blood pressure is increased, infusion is sometimes stopped by an alarm.
Also, in the conventional infusion apparatus, an alarm is sometimes produced before the force to the plunger reaches a predetermined supremum, and the operating pump is stopped. This is because the friction factor between the barrel and the plunger is not considered. More specifically, to determine the net injection amount of the infusion solution from the force to the plunger, it is indispensable to consider the friction factor between the barrel and the plunger slidably mounted thereto.
Furthermore, since the conventional infusion apparatus employs a small capacity EPROM, it cannot store all the specification data of the syringes of different manufacturers and all the operation programs for use in these syringes. Therefore, different standard EPROMs for different manufacturers must be used. Hence, a label must be adhered to the infusion apparatus to indicate that this apparatus corresponds to the syringe o
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Kawasaki Tatsuro
Matsubara Kazuo
Yamashita Yoshishige
Atom Kabushiki Kaisha
Rosenbaum C. Fred
Van Over Perry E.
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