Rotatable Sleeve Guide for Precise Parenteral Injection Angles
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Solution Overview
Problem
Existing injection methods require manual alignment and stretching of the skin to ensure accurate needle insertion at specific angles for intradermal or subcutaneous injections, leading to potential errors if the needle is inserted at incorrect angles.
Innovation Solution
A parenteral injection apparatus featuring a rotatable sleeve and housing system that allows for precise alignment and insertion of the needle at desired angles, eliminating the need for manual skin stretching, with detents and rotation recesses guiding the needle to the correct depth and angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual skin stretching and angle alignment is used for injection, then the injection can be performed with simple equipment, but the accuracy of needle insertion angle is poor and errors are frequent
Solution Approach 1:
A guide sleeve is introduced as an intermediary component between the syringe and the patient's skin. The guide sleeve includes a guide arm with detents that engage with rotation recesses in the housing to mechanically enforce the correct injection angle (5-15 degrees for intradermal injections). This intermediary device transfers and maintains the precise angular relationship without requiring complex active control systems.
Solution Approach 2:
The guide arm with detents and rotation recesses creates a self-aligning mechanism that automatically guides the needle at the correct angle without requiring the administrator to manually measure or calculate the angle. The mechanical engagement of detents with rotation recesses self-enforces the proper orientation, making the system self-correcting and eliminating the need for complex external alignment tools.
2Reliability
If manual alignment by administrator is used, then the device operation is simple, but the reliability of correct needle insertion is low
Solution Approach 1:
The guide sleeve acts as a mechanical intermediary that ensures reliable angle maintenance. The guide arm with detents engages with rotation recesses in the housing to create a mechanical lock that prevents deviation from the correct injection angle. This intermediary mechanism provides fail-safe angle enforcement without requiring the administrator to continuously monitor or adjust the angle during insertion.
Solution Approach 2:
The patent replaces the manual skill-based alignment process with a mechanical guidance system. Instead of relying on the administrator's ability to visually estimate and manually maintain the correct angle, the mechanical guide arm with detents and rotation recesses physically constrains the syringe to the correct angular position, substituting human skill with a reliable mechanical system.
3Productivity
If correct angle insertion is required to see weal or bleb, then the injection accuracy can be verified visually, but reinsertion is needed if angle is incorrect causing loss of time
Solution Approach 1:
The correct injection angle is pre-established through the mechanical guide arm and detent system before the injection attempt begins. The guide sleeve is designed with the correct angle (5-15 degrees for intradermal injections) built into its geometry, and the detents are positioned to engage with rotation recesses that lock the syringe at this pre-determined correct angle, ensuring first-attempt success and eliminating the need for reinsertion.
Solution Approach 2:
The mechanical engagement of detents with rotation recesses provides immediate tactile and visual feedback to the administrator that the correct angle has been achieved. The detent engagement creates a audible click or tactile sensation that confirms proper alignment, allowing the administrator to verify correct positioning before injection without needing to wait for visual confirmation of a weal or bleb, thereby preventing incorrect injections before they occur.
Data Source
AI summary
The disclosure relates to a parenteral injection apparatus that guides a needle of an injector into a target site to deliver medicaments and other fluids.