A High Precision Syringe Using Piezoelectric Stack

Abstract

The present invention relates to a syringe. A high-precision syringe using piezoelectric stacking, including an injection needle (1), a syringe outer cylinder (2), a piston (3) and a driving device, the piston matches the inner diameter of the syringe outer cylinder, and the driving device passes through a connection The rod (5) is connected with the piston (3), and it is characterized in that: the driving device adopts two piezoelectric stack drivers (6) symmetrically arranged in the driving device fixing frame (7), and the driving device fixing frame and the syringe The outer cylinder is connected and fixed, and the output displacement of the piezoelectric stack driver (6) is amplified by the triangle amplifying mechanism (9), and then connected to the piston (3) through the connecting rod (5). Compared with the existing high-precision injector, the driving device of the present invention not only has no mechanical friction and no noise, but also has the characteristics of high flow output control accuracy, stable output, and low manufacturing cost.

Description

technical field [0001] The invention relates to a syringe, in particular to a piezoelectric stacked high-precision syringe. Background technique [0002] Syringes are the most common injection devices, widely used in medical and health, bioengineering, chemical analysis and testing and other fields. This field has high requirements on the performance of syringes, mainly requiring high flow output control accuracy, stable output, fast response speed, and high output pressure. Therefore, how to improve the flow output control accuracy of existing syringes, the stability of flow output and Response speed has become a key research and development direction in the field of syringe technology. [0003] At present, the research on syringes at home and abroad is relatively active, and the main researched syringes are filter syringes and integrated syringes. The filter syringe uses the specific suction channel on the filter element to draw the liquid drug into the syringe, and then...

AI Technical Summary

Problems solved by technology

The filter syringe has the advantages of simple manufacturing process, low cost, and integration of filtration and injection, but the invention cannot improve the flow output control accuracy and output pressure of the syringe.

The design of the needle tip structure of the one-piece syringe is more reasonable. It adopts two oblique cut surfaces to increase the penetration of the needle tip. Painful to pierce, but the syringe does not improve the smoothness and responsiveness of the flow output

[0004] The prior art literature discloses the use of a stepping motor as the driving device of the syringe or syringe pump to improve its precision, but the syringe has the disadvantages of complex structure, high manufacturing cost, mechanical friction and noise, etc.

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