Composite Extraction Pen Linear Actuator Precision Delivery
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Solution Overview
Problem
Current dental composite filling devices are cumbersome, lack stability, obstruct the dentist's view, and require frequent cartridge changes, leading to imprecise and time-sensitive applications.
Innovation Solution
A portable, cordless, rechargeable composite extraction pen with a linear actuator and adjustable delivery speed, designed for precise and directional composite delivery, accommodating various cartridge configurations and allowing bracing against the patient's jaw for improved control and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hand actuated pistons are used to apply composite, then the device is simple to operate, but the precision is limited by hand stability and the device size obscures the dentist's view
Solution Approach 1:
The patent replaces the hand actuated mechanical piston system with an electronically controlled linear actuator system. The linear actuator uses an electric motor to drive a ball screw mechanism, converting rotational motion to linear motion for precise composite delivery. This substitution eliminates hand shake and provides motorized control with adjustable speeds, significantly improving delivery precision while maintaining ease of operation through electronic controls.
2Speed
If air actuated cylinders are used to apply composite, then the delivery speed can be controlled, but the device requires compressed air source and hoses that complicate the system
Solution Approach 1:
The patent extracts and eliminates the external compressed air source and hose system from the composite delivery device. Instead, it integrates an electric motor directly into the handheld unit, powering the linear actuator through an onboard battery. This extraction of the air supply system simplifies the overall device architecture, removes the need for hoses and external air tanks, and maintains speed control capability through electronic motor control.
Solution Approach 2:
The patent introduces an electronic control system as an intermediary between the operator and the composite delivery mechanism. The microcontroller receives input from the dentist, processes it, and controls the motor speed and direction accordingly. This electronic intermediary provides precise speed control without requiring the complex pneumatic valve and pressure regulation systems that would be needed for air actuated cylinders.
3Power
If current large-sized applicators are used, then the device has enough power to deliver composite, but the size prevents full view of the oral cavity and reduces stability
Solution Approach 1:
The patent applies local quality by concentrating the power-generating components (motor and battery) in a compact, densely packed arrangement within the handheld unit. The linear actuator uses a high-torque motor with a ball screw mechanism that generates sufficient force in a small space. The ergonomic handle provides a secure grip that allows the dentist to brace against the patient's jaw, effectively using the patient's anatomy as a counterbalance to reduce the impact of the device's weight and size.
4Adaptability or versatility
If carpules are frequently replaced for blending colors and materials, then color mixing is achieved, but the process is time-consuming and the composite application is time-sensitive
Solution Approach 1:
The patent merges multiple carpules together to form a single extended composite supply unit. The linear actuator is designed to traverse the entire length of the merged carpules, allowing the dentist to load multiple colors or materials into one continuous supply. This merging eliminates the need to stop and replace individual carpules during the procedure, as the actuator can simply continue moving through the extended composite supply, maintaining the time-sensitive nature of composite application while achieving color blending goals.
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 provides stable, precise, and efficient delivery of dental composite with minimal lateral movement, enabling better control and visibility during procedures, reducing the need for frequent cartridge changes and minimizing the risk of composite drying or light sensitivity issues.
Implementation Method 1
It is cordless and powered by a rechargeable battery, preferably inductively charged.
Implementation Method 2
A portable, cordless, rechargeable composite extraction pen with a linear actuator and adjustable delivery speed
Data Source
AI summary
A lightweight, small footprint, composite extraction pen, for the delivery of dental filling composite from commercially available composite filled carpules. An electric linear actuator is housed in a slender, pen-like housing configured to accept, constrain and allow the rotational positioning of commercially available composite filled carpules. The carpules are contained within an adaptor that connects to the body of the pen. The linear actuator extends and retracts a piston through a bore in the carpule so as to exert pressure on the composite contained therein. The pen provides precise composite delivery while maintaining a highly visible dental environment.