Power-efficient controlled jet injection using a compound ampoule.

Area of Science:

• Biomedical Engineering
• Drug Delivery Systems

Background:

• Conventional needle-free jet injectors often require substantial power, limiting device portability and efficiency.
• Optimizing power consumption is crucial for advancing transdermal drug delivery technologies.

Purpose of the Study:

• To introduce and evaluate a 'compound ampoule' mechanism for needle-free jet injection.
• To quantify the reduction in power and energy requirements compared to traditional single-piston designs.
• To demonstrate the functional efficacy and delivery capabilities of a prototype compound ampoule injector.

Main Methods:

• Theoretical analysis to derive expressions for power and energy consumption of compound versus single-piston ampoules.
• Development and testing of a prototype compound ampoule injector.
• In vitro delivery assessments using post-mortem porcine tissue to evaluate 1 mL liquid delivery.

Main Results:

• The compound ampoule design reduces maximum required input power to less than one-fifth of conventional methods.
• This reduction allows for the use of motors less than half the mass for equivalent injections.
• Prototype testing confirmed functional operation and validated the predicted power and energy savings.
• Effective delivery of 1 mL liquid into porcine tissue was achieved, comparable to conventional ampoules.

Conclusions:

• The compound ampoule represents a significant advancement in needle-free jet injection technology.
• This mechanism enables the development of lighter, more power-efficient injectors for transdermal drug delivery.
• The findings support the progression towards practical, portable, and efficient drug delivery devices.