Combined Needle and Cannula Injection Device
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Solution Overview
Problem
The current two-step needle-and-cannula method for dermal and sub-dermal injections is cumbersome, time-consuming, and poses safety concerns due to the need to repeatedly puncture the skin and relocate the cannula, increasing the risk of infection and discomfort for both clinician and patient.
Innovation Solution
A combined needle and cannula device that includes a syringe holder with a slider to advance and retract the needle, allowing the needle to be safely housed within a needle guard while the cannula is used for injection, thereby simplifying the injection process and reducing the risk of complications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-step needle-and-cannula method is used for dermal and sub-dermal injections, then safety is improved and risk of complications is reduced, but the procedure becomes cumbersome and time-consuming
Solution Approach 1:
The patent combines the needle and cannula into a single integrated device where the needle is housed within the cannula. This allows the sharp needle to create the initial puncture while the blunt cannula remains positioned for safe substance delivery, eliminating the need for separate needle removal and cannula insertion steps. The integrated design maintains safety benefits while significantly simplifying the procedural workflow.
Solution Approach 2:
The needle is nested within the cannula structure, with the needle shaft fitting inside the cannula lumen. This nested configuration allows the needle to be advanced to the skin surface for puncture creation, then retracted back into the cannula while maintaining the puncture channel open. The cannula serves as a protective sheath that guides and supports the needle during the procedure.
2Reliability
If a two-step needle-and-cannula method is used for dermal and sub-dermal injections, then safety is improved and risk of complications is reduced, but the procedure becomes time-consuming
Solution Approach 1:
By merging the needle and cannula into a single operational unit, the patent eliminates the time required for needle removal, repositioning, and separate cannula insertion. The integrated device allows continuous operation where the needle creates the puncture and the cannula immediately delivers the substance through the same access point, significantly reducing procedural time while maintaining safety.
Solution Approach 2:
The integrated needle-cannula design enables continuous useful action by maintaining the injection pathway open throughout the procedure. The needle creates the puncture channel and the cannula remains positioned within that channel for immediate substance delivery, eliminating interruptions and repositioning steps that would otherwise break the continuous workflow.
3Strength
If a sharp hypodermic needle is used for skin puncture, then penetration ability is improved, but the risk of tissue damage and infection increases
Solution Approach 1:
The injection device is segmented into two functional components: a sharp needle for skin penetration and a blunt cannula for substance delivery. The needle performs the harmful function of piercing the skin with minimal tissue disruption, while the cannula performs the beneficial function of delivering the substance safely through the created opening without causing additional tissue damage or infection risk.
Solution Approach 2:
The cannula acts as an intermediary between the needle and the injection site. The needle creates the initial access channel through the skin, and the cannula then serves as the intermediate delivery mechanism that transports the substance through this pre-created pathway. This intermediary approach allows the sharp needle to be used for penetration while the blunt cannula minimizes further tissue trauma and infection risk during substance delivery.
Data Source
AI summary
A device for performing injections in a patient includes a syringe holder with a needle guard, a cannula extending from the syringe holder, a needle slidably disposed over the cannula, and a slider on the syringe holder. The cannula has a blunt tip and a cannula length, and the needle has a sharp tip and a needle length that is shorter than the cannula length. The slider is coupled with the needle and is configured to slide the needle along the cannula from an extended position, in which the sharp tip of the needle is located at or immediately adjacent the blunt tip of the cannula, to a retracted position, in which the sharp tip is housed within the needle guard of the syringe holder.