Portable drug injector

Abstract

The invention relates to a portable drug injector, and belongs to the field of medical instruments. The top of a main body is provided with a syringe, the main body is provided with a cylinder chamber, a main piston divides the cylinder chamber into left and right chambers, a push rod of the main piston stretches out from the left wall of the cylinder chamber and abuts against a push rod of an auxiliary piston; the main body is arranged on a box body, left and right bosses of the main body are placed in left and right sinking cavities of the box body respectively, flow inlet and outlet holes in the main body are communicated with flow inlet and outlet holes in the box body respectively; body tables of the main body press drivers in body cavities of the box body through sealing rings to form upper and lower compression cavities, the diameters of the upper and lower compression cavities are gradually decreased from left to right, and the upper and lower compression cavities are firstly connected in parallel and then connected in series; each energy converter is composed of two piezoelectric vibrators and a gasket between the corresponding piezoelectric vibrators, and each piezoelectric vibrator is formed by bonding a base plate and a piezoelectric plate; when the portable drug injector is in use, the deformation directions of the two piezoelectric vibrators of the same energy converter are same, and the deformation directions of piezoelectric vibrators in every two adjacent drivers on the left and right are opposite; left and right cavities are connected with a reversing valve through air conveying pipes, and the reversing valve is connected with an air storage chamber through an air conveying pipe.

Description

technical field [0001] The invention belongs to the field of medical equipment, and in particular relates to a portable drug injector. 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 the air, and there is a poss...

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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