Dual Barrel Injection Device with Automatic Needle Retraction
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Solution Overview
Problem
Current medical devices for administering multiple injections with two or more components face challenges such as contamination, improper mixing, tissue damage, and the need for multiple punctures, which complicates efficient and safe delivery of mixed substances.
Innovation Solution
A device with a housing that includes a needle housing, syringe barrels, plungers, and a plunger base, allowing for simultaneous or sequential movement of the needle and plunger to mix and dispense two or more liquid components through a single injection needle, with a mechanism for automatic needle extraction and easy refilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple separate injections are administered to deliver two or more components, then complete dosage delivery is achieved, but tissue damage increases and treatment time increases
Solution Approach 1:
The patent combines multiple separate injection procedures into a single injection device that can deliver two or more components through one needle puncture. The device integrates multiple syringe barrels and plunger mechanisms into one unified system, allowing simultaneous or sequential delivery of multiple substances (e.g., fibrinogen and thrombin) through a single injection site, thereby reducing tissue trauma while ensuring complete dosage delivery.
2Ease of operation
If components are mixed in a common solution before injection, then injection procedure is simplified, but contamination risk increases
Solution Approach 1:
The patent segments the injection system into separate compartments (multiple syringe barrels) that remain isolated until the moment of injection. Each component is stored in its own sealed barrel with its own plunger, preventing premature mixing and contamination. The segments are brought together only at the point of delivery through the single needle, maintaining sterility while simplifying the overall injection procedure.
3Manufacturing precision
If manual mixing of components is performed, then proper mixing may be achieved, but mixing consistency deteriorates
Solution Approach 1:
The device enables self-service mixing where the components mix automatically upon contact at the injection site or within the needle hub, without requiring manual manipulation. The mechanical design ensures that plunger movement automatically drives the components together in controlled proportions, eliminating variability associated with manual mixing techniques while maintaining operational simplicity.
4Ease of operation
If needle is extracted manually after each injection, then precise control is maintained, but productivity decreases
Solution Approach 1:
The patent enables continuous injection action by allowing the needle to remain inserted in the tissue throughout multiple injection cycles. The device can sequentially deliver multiple components or multiple doses through the same needle puncture without requiring extraction and re-insertion, maintaining precise control through mechanical interlocks while significantly improving productivity by eliminating repeated puncture cycles.
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
Enables efficient, safe, and cost-effective administration of mixed substances with a single puncture, reducing tissue damage and ensuring proper mixing of components, while allowing for multiple injections on a 2-D surface without manual lifting.
Implementation Method 1
a plunger spring in contact with the plunger base, whereby the plunger spring is compressible when the at least one catch of the needle housing is coupled with the plunger base for storing energy in the plunger spring
Implementation Method 2
a mixing chamber located between distal ends of the first and second conduits and a proximal end of the injection needle, the mixing chamber being adapted for combining the first and second liquid components into a liquid solution
Implementation Method 3
a mixing chamber located between distal ends of the first and second conduits and a proximal end of the injection needle, the mixing chamber being adapted for combining the first and second liquid components into a liquid solution
Data Source
AI summary
A device for administering injections includes a housing having an upper end, a lower end including a bottom surface with an injection needle opening, and an axis extending between the upper and lower ends. The device includes a needle housing with an injection needle. The needle housing is disposed within the housing for moving between a retracted position and an extended position. The device has an injection actuator for commencing an injection cycle including a first stage in which the needle housing and said plunger base are coupled together and move in a first direction along the axis and a second stage in which the needle housing and the plunger base are decoupled from one another so that the plunger base is free to move away from the needle housing in a second direction that is opposite the first direction.