Piezoelectric sheet driven drug injector

Abstract

The invention relates to a piezoelectric sheet driven drug injector, and belongs to the field of medical instruments. The top of a main body is provided with a syringe with a secondary piston and a cylinder chamber, and a main piston divides the cylinder chamber into left and right cylinder chambers; a main piston push rod protrudes through the left wall of the cylinder chamber and abuts against asecondary piston push rod; the bottom of the man body is provided with an upper air inlet hole, a boss and a plurality of round table groups; the top of a box body is provided with a lower air inlethole, a hole chamber, a gas storage chamber communicated with a lower outlet chamber and body chamber groups and body chambers respectively equal to the number of the round table groups and the numberof round tables included therein; the main body is mounted on the box body, and the boss is placed in the hole chamber and makes upper and lower outlet chambers be communicated with the gas storage chamber; the round tables press drivers in the body chambers through sealing rings to form upper and lower compression chambers, the upper and lower compression chambers in the same body chamber groupsare respectively connected in parallel to form upper and lower compression chamber groups, and each upper compression chamber group and each lower compression chamber group are respectively connectedin series to form upper and lower compression units; the left cylinder chamber is connected to a reversing valve through a gas transmission pipe, and the right cylinder chamber is connected to the gas storage chamber through the gas transmission pipe and the reversing valve.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to a medicine injector driven by a piezoelectric sheet. 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 t...

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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