Fluid Ejection Device Pressure Control for Surgical Precision
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Solution Overview
Problem
Existing fluid ejection devices in medical settings face challenges in controlling the ejecting strength due to variable fluid pressure, which can lead to unintended strong ejection when pressure is too high, compromising surgical precision and safety.
Innovation Solution
A fluid ejection device with a pressure detecting unit and control system that prevents fluid ejection when pressure exceeds a predetermined upper limit, ensuring the ejection strength is within a target range, and includes a mechanism to maintain pressure within a narrower range to prevent overshoot and enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the operation switch is operated in a state in which the pressure of the fluid in the fluid supplying unit is too high, then the ejecting strength of the fluid increases, but strong ejecting not intended by the surgeon is performed
Solution Approach 1:
The system continuously monitors fluid pressure through a pressure detecting unit and uses this feedback to control the piezoelectric element's driving voltage. When pressure exceeds the upper limit value, the control unit adjusts the driving voltage to maintain pressure within the safe range, preventing unintended strong ejection while ensuring reliable fluid ejection when needed.
Solution Approach 2:
The system dynamically changes the driving voltage parameter of the piezoelectric element based on real-time pressure measurements. By adjusting the driving voltage in response to pressure changes, the system maintains ejecting strength within the desired range and prevents safety issues caused by excessive pressure.
2Ease of operation
If the pressure of the fluid in the fluid supplying unit is not controlled, then the ejecting strength varies, but surgical precision is compromised
Solution Approach 1:
The pressure detecting unit continuously monitors fluid pressure and provides feedback to the control unit, which adjusts the piezoelectric element's driving voltage to maintain consistent ejecting strength. This feedback mechanism ensures surgical precision while allowing operational flexibility as the surgeon can control the operation switch freely.
Solution Approach 2:
The system replaces manual mechanical pressure control with an automated electro-mechanical control system. The control unit electronically adjusts the piezoelectric element's driving voltage based on pressure sensor feedback, providing more precise and stable ejecting strength control than manual mechanical methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device ensures safe and precise fluid ejection by preventing strong ejection when pressure is too high and maintaining stable pressure, thereby improving surgical control and accuracy.
Implementation Method 1
a pulsed flow generating unit that ejects fluid in a pulse-like manner
Implementation Method 2
a pressure detecting unit configured to detect pressure in the fluid storing unit
Data Source
AI summary
A fluid ejection device includes a fluid storing unit and a fluid outlet. A fluid pressing unit presses the fluid storing unit and causes fluid to flow from the fluid outlet. A connection pipe has an end that is connected to the fluid outlet. A fluid ejection unit ejects the fluid, which is received from a fluid intake port to which the other end of the connection pipe is connected, in a pulse-like manner according to a drive signal generated by a fluid-ejecting control unit. An ejecting-instruction input unit receives a fluid ejecting instruction. If the pressure in the fluid storing unit is equal to or higher than an upper limit value in a range determined with reference to a target pressure value, the drive signal is not generated. When the pressure in the fluid storing unit is lower than the upper limit value, the drive signal is generated.