Medicinal liquid infusion apparatus

Abstract

An easy-to-carry medicinal liquid infusion apparatus (1) capable of suppressing sudden change in flow rate even if an environmental temperature increases. The apparatus comprises a drive part (2) and is formed to infuse a medicinal liquid in a medicinal liquid container (3) into a patient by pressurizing the medicinal liquid container (3) by the drive force of the drive part. The drive part (2) comprises a gas cylinder (4) in which a compressed gas is sealed, and is formed to generate the drive force by a pressure in the gas cylinder (4).

Description

technical field [0001] The present invention relates to a medical solution input device for injecting a medical solution contained in a medical solution container to a patient. Background technique [0002] In general, a conventional medical solution input device has a driving source, and injects the medical solution into a patient while discharging the drug solution in the drug solution container by the driving force of the drive source (for example, Patent Document 1). [0003] In the above-mentioned liquid medicine input device, a gas tank filled with liquefied carbonic acid gas is used as a driving source. In addition, in the above-mentioned liquid medicine input device, the bellows container partitioning the pressurized chamber is stretched by reaching the pressurized condition generated by the saturated vapor pressure of the liquefied carbonic acid gas in the pressurized chamber which can communicate with the above-mentioned gas tank. The bellows container pressurizes...

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Problems solved by technology

[0006] That is, since the saturated vapor pressure has a characteristic of increasing in a quadratic curve as the temperature rises (refer to L2 in Figure 6), therefore, for example, when the ambient temperature decreases from 25°C to 20°C, the change in vapor pressure is related to the ambient temperature From the change of vapor pressure when the temperature rises from 25°C to 30°C, although the temperature difference is the same (5°C), the change of vapor pressure increases significantly when the temperature rises

[0007] Therefore, in the medical solution input device of the above-mentioned Patent Document 1, when the ambient temperature rises to be higher than the above-mentioned standard operating temperature, the change of the flow rate will be significantly increased.

In addition, an allowable range is generally set for the above-mentioned predetermined flow rate, but in the liquid medicine input device of the above-mentioned Patent Document 1, in order to accommodate the actual flow rate within the allowable range, when setting the allowable range for the above-mentioned standard operating temperature, no Do not decrease the positive side value, increase the negative side value

[0008] However, the above-mentioned medical solution input device is assumed to be placed on the patient's bedside and used (that is, to be used at room temperature), and to be carried by the patient (that is, to be used at a temperature environment close to the patient's body temperature). case), on the other hand, as the above-mentioned standard operating temperature, since it is mostly set according to the room temperature that is easy to manage by medical practitioners, etc., when the patient carries it for use, the ambient temperature will be higher than the above-mentioned standard operating temperature

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