A Piezoelectric Stack Driven Injection System

Abstract

The invention relates to an injection system driven by piezoelectric stacks, and belongs to the field of medical apparatuses. A main body is installed on a base, an injector is installed at the end ofa cylinder cavity of the main body, a piston is arranged in a syringe cylinder, and a push rod of the piston is arranged in the cylinder cavity; the bottom of the main body is provided with at leasttwo guide hole groups formed by guide holes and an outlet hole communicated with the cylinder cavity; the top of the base is provided with an inlet hole, an outlet cavity, body cavity groups and bodycavities, the body cavity groups have the same number as the guide hole groups, the body cavities have the same number as the guide holes involved in the guide hole groups, and the body cavities and the guide holes have the equal diameter; only one body cavity in each body cavity group is provided with an inlet cavity and an air outlet hole, and the other body cavities of each body cavity group are only provided with ventilation holes; inlet and outlet cavities and valves in the inlet and outlet cavities constitute inlet and outlet valves respectively; diaphragms are arranged between the mainbody and the base, and the outlet cavity is communicated with an outlet hole through through holes in the diaphragms; the diaphragms, the body cavities and the inlet valves constitute compression cavities, the compression cavities in the same body cavity group are connected in parallel to form a compression cavity group, and all the compression cavity groups are connected in series; the piezoelectric stacks in the guide holes press pistons on the diaphragms, the pistons are of a T-shaped structure, and the small ends of the pistons are in contact with the diaphragms.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to an injection system driven by a piezoelectric pile. Background technique [0002] Existing injections mainly include 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 contac...

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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