Injection Device Accessory for Controlled Depth and Needle Protection
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Solution Overview
Problem
Drug injection devices often experience excessive force application, leading to skin compression against bone, needle bending, and difficulty in visually determining the retracted position of the sliding sleeve due to user variability and varying soft tissue amounts at injection sites.
Innovation Solution
An accessory for drug injection devices that includes a receptacle with a cavity to limit insertion depth and a wider base to distribute force, providing visual indicators and consistent positioning to ensure proper injection depth and sleeve retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drug injection device is pressed into the patient's skin with excessive force, then the sliding sleeve can be retracted, but the patient's skin is compressed toward the bone causing needle bending
Solution Approach 1:
The accessory acts as an intermediary between the injection device and the patient's skin. It includes a recess that receives the sliding sleeve and a broader base that distributes applied force across a larger skin area, preventing direct compression of the needle against bone while still enabling sleeve retraction.
Solution Approach 2:
The accessory extends the interaction in a lateral dimension by providing a broader base than the injection device itself. This dimensional expansion allows force distribution across a larger area, separating the needle compression problem from the sleeve retraction function.
2Ease of operation
If the drug injection device is pressed into the patient's skin with excessive force, then the sliding sleeve can be retracted, but the needle tip may contact the patient's bone
Solution Approach 1:
The accessory serves as a protective intermediary that prevents direct contact between the needle tip and the patient's bone. The recess structure guides the sliding sleeve while the broader base distributes force, creating a safety buffer that maintains needle integrity during the injection process.
3Ease of operation
If the drug injection device is pressed into the patient's skin, then the sliding sleeve retracts, but it becomes difficult to visually determine when the sleeve has reached the retracted position
Solution Approach 1:
The accessory includes visual indicators that change or become visible when the sliding sleeve reaches the retracted position. These indicators provide clear visual feedback to the user, making it easy to detect when the sleeve has fully retracted without requiring complex measurement systems.
4Ease of operation
If the drug injection device is pressed into the patient's skin with excessive force, then the sliding sleeve can be retracted, but the uncompressed skin adjacent the injection site can surround and collapse towards the sliding sleeve
Solution Approach 1:
The accessory acts as a structural intermediary that prevents skin collapse toward the sliding sleeve. The broader base provides a stable foundation that distributes force evenly, while the recess structure maintains proper spacing between the sleeve and the surrounding skin, preventing collapse during the injection process.
Data Source
AI summary
In one example, an accessory for a drug injection device has a proximal end, a distal end, a receptacle, and a base. The receptacle defines a cavity that extends into the proximal end towards the distal end and terminates at an inner surface. The cavity receives an injection end of the drug injection device therein so as to position a needle of the drug injection device for delivery of a medication. The receptacle defines an opening that extends into the distal end and through the inner surface. The opening receives the needle of the drug injection device therethrough and has a cross-sectional dimension that is smaller than a cross-sectional dimension of the cavity. The base is disposed at the distal end of the injection device and has a skin-contacting surface with a cross-sectional dimension that is greater than the cross-sectional dimension of the cavity.