Fluid Ejection Device Pressure Surge Control
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Solution Overview
Problem
Existing fluid ejection devices that eject fluids in a pulsed manner for medical applications often experience unintended high ejection forces due to temporary pressure increases, which can be detrimental in procedures like tissue incision or excision.
Innovation Solution
A fluid ejection device with a control unit that sends an ejection signal after a predetermined time from opening the connection channel, allowing the fluid to reach a stable pressure before being ejected, thereby reducing the risk of high pressure surges and unintended ejection forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the connection channel is opened at the same time as the fluid ejection is initiated, then the fluid can be supplied immediately to the ejection unit, but the pressure increases temporarily causing unintended high ejection force
Solution Approach 1:
The connection channel is opened in advance before the fluid ejection is initiated. This allows the fluid to flow into the ejection unit and reach a stable pressure state before the ejection process begins, preventing temporary pressure increases and unintended high ejection forces while maintaining efficient fluid supply
2Object-affected harmful factors
If the connection channel is opened before the ejection signal, then the pressure surge is reduced, but the fluid supply time is extended
Solution Approach 1:
The connection channel is opened at a predetermined time before the ejection signal is sent, allowing the fluid supply to start in advance. This timing arrangement enables the fluid to reach a stable pressure state before ejection begins, reducing pressure surges while minimizing the extension of fluid supply time through optimized scheduling
Data Source
AI summary
A fluid ejection device includes: a fluid ejection unit that ejects a fluid in a pulsed manner; a fluid accommodation portion that accommodates the fluid at a predetermined pressure or higher; a fluid supply unit that supplies the fluid accommodated in the fluid accommodation portion to the fluid ejection unit; a connection channel that connects the fluid ejection unit and the fluid accommodation portion, and acts as a channel through which the fluid flows; an opening and closing unit that opens and closes the connection channel; and a control unit that sends an open signal for opening the connection channel to the opening and closing unit, and sends an ejection signal for ejecting the fluid to the fluid ejection unit. The control unit sends the ejection signal after a predetermined amount of time has elapsed from the sending of the open signal.