Dose-adjustable reusable injection pen

Abstract

The invention discloses a dose-adjustable reusable injection pen, comprising an external button, a button shaft sleeve, a bidirectional ratchet wheel, a knob, a graduated disc, an internal thread sleeve, a rotational pawl, a rotating shaft rod, a ratchet disc, an upper shell, a pen hook, a thread connector, an engaging-disengaging connector, an engaging-disengaging ratchet wheel, a screw, an engaging-disengaging spring, a refill support and a lower shell. One end of the external button encases the manually rotated knob and drives the rotational pawl to rotate, the rotational pawl is fully mated in the internal thread sleeve through three positional points different in specification, the rotational pawl can rotationally rise only according to a spiral of the internal thread sleeve when rotating, the graduated disc also rotational rises at the same time, graduation changes can be observed through the transparent window, and the knob is rotated continuously until a graduation mark corresponding to a pointer indicates an injection dose to be applied. The dose-adjustable reusable injection pen has the advantages such as low product cost, adjustable injection dosage, high injection precision, transmission mechanism simplicity, small size, portability and reusability, and a simple, convenient, precisely dosed and low-cost injection mode is provided for patients.

Description

technical field [0001] The invention relates to the fields of medical treatment, cosmetology and other related biotechnology, in particular to an injection pen with adjustable dosage and repeated use. Background technique [0002] The existing injection techniques are basically divided into two types: one is the disposable injection needle routinely used by medical staff. This injection method needs to be completed in the hospital under the supervision of medical staff. One-time injection into the human body, suitable for routine treatment of patients inside and outside the hospital; the other is a special injection pen for insulin imported from abroad, which is specially for diabetic patients, and the price of this injection pen is relatively high. [0003] For some special patients in clinical practice, such as diabetic patients, hepatitis patients, etc., insulin, interferon, growth hormone, vaccines, etc. need to be injected, and the accuracy of the injection dosage is pa...

AI Technical Summary

Problems solved by technology

However, the aforementioned injection technology cannot meet the self-injection needs of diabetic patients, hepatitis patients and other patients, and is not easy to carry; the latter insulin injection pen produced abroad has high production cost and high price, which increases the burden on patients.

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