Air-Driven Dental Impression Syringe with Pen-Type Grip
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Solution Overview
Problem
Current impression syringes with pistol grip designs are difficult to control for precise placement of impression material around teeth, often requiring multiple materials and are prone to air bubble issues, which can lead to impression failure.
Innovation Solution
An air-driven impression syringe with a pen-type grip and breech end loading design, featuring a cylindrical body, air-driven piston, and center rod, allowing precise placement of impression material without the need for retraction cords and using a single viscosity material, utilizing a pen grasp for control and eliminating air bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pistol grip manual action syringe is used to deliver impression material, then the syringe can deliver material with force, but it is very difficult to control for precise placement in the sulcus
Solution Approach 1:
The syringe is segmented into distinct functional zones: a grip section for finger placement, a barrel section for material storage, and a tip section for material delivery. This segmentation allows the operator to grip the handle for stability while the air pressure system independently provides the extrusion force, separating the control function from the force generation function.
Solution Approach 2:
The patent replaces manual piston action with pneumatic pressure delivery. Compressed air is introduced into the barrel to push the impression material through the tip into the sulcus. This pneumatic system provides consistent, controlled force without requiring manual gripping pressure, thereby improving both ease of operation and precision of material placement.
2Reliability
If traditional impression materials of different viscosities are used, then the impression can be taken, but it requires one or two cords placed around individual teeth to open the sulcus
Solution Approach 1:
The pneumatic delivery system enables the use of a single viscosity impression material by providing controlled pressure to push the material into the sulcus. The air pressure overcomes the need for mechanical cord placement to open the sulcus, as the pressurized material can penetrate and fill the sulcular space effectively on its own.
Solution Approach 2:
The patent changes the delivery parameter from manual extrusion to pneumatic pressure. This parameter change allows a single impression material viscosity to be effectively used, as the controlled air pressure delivers the material precisely where needed without requiring multiple materials or auxiliary cords to facilitate placement.
3Ease of operation
If manual action is used to extrude impression material, then the operator can control the flow, but air bubbles are a common source of impression failure
Solution Approach 1:
The pneumatic pressure system delivers impression material in a controlled, bubble-free manner. The pressure is applied uniformly through the material column, pushing it smoothly through the tip without trapping air bubbles. This eliminates a common source of impression failure while maintaining operator control through adjustable air pressure.
Solution Approach 2:
The patent replaces the manual mechanical extrusion system with a pneumatic pressure system. This substitution eliminates the mechanical actions that can trap air bubbles (such as manual squeezing and positioning), replacing them with a smoother, more controlled pneumatic delivery that reduces the risk of air bubble formation and improves impression reliability.
Data Source
AI summary
An air driven impression syringe designed to be held with a pen type grip and capable of precise placement of impression material. An embodiment of the device is a dental tool useful in the fabrication of dental prostheses capable of extruding impression material comprising a cylindrical grip body with two ends, an air-driven piston with a center rod; andwhere the cylindrical body defines a bore to accept the air driven piston, a channel on one end of the syringe and a source of pressurized air. The syringe includes a disposable tip pre-loaded with dental impression material attached to the channel such that a second bore in said syringe tip containing dental impression material aligns with the rod and wherein the rod can extend beyond the end of the body into the second bore to extrude material from the tip.