Infusion device driven by piezoelectric stacks

Abstract

The invention relates to an infusion device driven by piezoelectric stacks, and belongs to the field of medical apparatuses. A base is provided with outlet and inlet holes, an outlet cavity and at least two sinking cavities with unequal diameters, the diameters of the sinking cavities are gradually reduced from left to right, and inlet cavities and air outlet holes are formed in the bottom walls of the sinking cavities; the inlet and outlet cavities and valves installed in the inlet and outlet cavities form inlet and outlet valves respectively; guide holes which have the same number and diameter as those of the sinking cavities respectively are formed in the bottom of a main device body, the main device body is installed on the base, diaphragms are pressed on the base, and the guide holesand the sinking cavities are symmetrically formed in the two sides of each diaphragm; the piezoelectric stacks in the guide holes press pistons on the diaphragms; the diaphragms press sealing rings inthe sinking cavities to constitute compression cavities which are connected in series; a bag cavity internally provided with an airbag and a medicine bag is formed in the top of the main device body,and a baffle is installed at the end of the side wall of the bag cavity; a liquid outlet tube of the medicine bag is provided with a flow adjusting valve and a syringe needle, an air inlet tube of the airbag is connected with the outlet hole of the base, and a switching valve and a deflating valve are arranged on an air inlet tube of the airbag. During work, the deformation directions of the diaphragms in every two adjacent compression cavities are opposite.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to a transfusion device driven by a piezoelectric stack. Background technique [0002] Injection mainly includes intravenous injection, intramuscular injection and subcutaneous injection. Intravenous injection is also called infusion drug administration. Most of the existing infusion devices are composed of infusion bottles, infusion tubes and infusion stands. This infusion mode will bring many problems in actual use: the flow rate is adjusted manually, and the flow control accuracy is not enough; the infusion bottle needs to be held high by others when the patient walks or goes to the toilet, which is inconvenient to move and the height of the infusion bottle is not high enough. Make the blood flow back; the patient or the nursing staff need to watch for a long time, if the infusion is not found in time, it may cause an accident; the liquid medicine is in contact with ...

AI Technical Summary

Problems solved by technology

This infusion mode will bring many problems in actual use: the flow rate is adjusted manually, and the flow control accuracy is not enough; the infusion bottle needs to be held high by others when the patient walks or goes to the toilet, which is inconvenient to move and the height of the infusion bottle is not high enough. Make the blood flow back; patients or nurses need to be guarded for a long time, if the infusion is not found in time, it may cause accidents; the liquid medicine is in contact with the air, and the ambient air may be polluted when the air is unclean

In addition to the above direct problems, sometimes the infusion time is shortened by reducing the amount of solution, speeding up the infusion speed, etc., which not only increases the burden on the heart, but also affects the therapeutic effect: intramuscular injection and subcutaneous injection in a relatively short period of time. The biggest disadvantage of injecting into muscle or subcutaneous is that the blood drug concentration varies greatly within an injection cycle, which is not conducive to the effective absorption and utilization of drugs, because most drugs have a better concentration range in the human body, and when the drug concentration is too high Has toxic side effects, if it is too low, it will have no therapeutic effect

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