Implantable Drug Pump Refill Needle Insertion Detection
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Solution Overview
Problem
Conventional implantable drug-delivery devices face challenges in safe refilling due to incorrect needle insertion, which can damage the device and cause harm to the patient, especially when treating hard-to-reach anatomical regions like the eye.
Innovation Solution
The implementation of sensors and visual aids in the fill port and refill tool to ensure proper needle insertion, using optical, acoustic, magnetic, or capacitive detection methods to verify correct insertion and prevent accidental damage or injection into tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a needle is used to refill the drug reservoir through the septum, then the device allows controlled drug delivery, but incorrect needle insertion can damage the device and harm the patient
Solution Approach 1:
The patent implements a needle guide that pre-establishes the correct insertion path and depth before the needle is actually inserted. The guide includes a needle receptacle with a predetermined opening that directs the needle to the exact required depth, preventing over-insertion and misalignment before the refilling action begins
Solution Approach 2:
The patent introduces a needle guide as an intermediary component between the needle and the drug reservoir. This guide acts as a mediator that controls and limits needle insertion, ensuring the needle reaches the correct depth without direct manual judgment, thereby preventing device damage and accidental tissue injection
2Ease of operation
If the septum is made easily penetrable by the needle, then refilling is simplified, but the septum may leak once the needle is withdrawn
Solution Approach 1:
The patent applies different material properties to different parts of the septum structure. The portion that contacts the needle is made of a softer, more compliant material that allows easy penetration, while the surrounding and deeper portions use harder, more structurally sound materials that provide sealing and prevent leakage after needle withdrawal
3Measurement precision
If visual aids and sensors are added to detect needle insertion, then insertion accuracy is improved, but device complexity increases
Solution Approach 1:
The patent incorporates visual indicators such as color-changing materials or colored markers on the needle and within the guide structure. These visual aids provide immediate, intuitive feedback about needle insertion status without requiring complex electronic sensors, thereby maintaining simplicity while improving detection accuracy
Solution Approach 2:
The patent replaces complex electronic sensor systems with simpler mechanical detection mechanisms. For example, mechanical stops, spring-loaded indicators, or tactile feedback mechanisms provide insertion confirmation through physical means rather than requiring power-consuming electronic sensors and signal processing systems
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
Ensures safe and accurate refilling of implantable drug pump devices by preventing incorrect needle insertion and minimizing the risk of damage or side effects, enhancing the reliability and safety of drug delivery to targeted areas.
Implementation Method 1
an (e.g., optical or acoustic) emitter-detector pair that establishes a signal path across the port, which is at least partially interrupted when the needle is properly inserted
Implementation Method 2
the needle may include a magnetic-field sensor that measures a magnetic field generated by magnets distributed around the fill port
Implementation Method 3
the insertion of an electrically conductive needle may be sensed capacitively via a pair of electrodes disposed on opposite side walls of the fill port
Implementation Method 4
the needle may, upon complete insertion into the fill port, contact an electrically conductive plate or a piezo-electric element on the bottom of the fill port to produce a measurable electrical effect
Data Source
AI summary
Implanted drug pump devices can be refilled with a refill needle inserted through a fill port in the drug reservoir of the drug pump device. Proper needle insertion may be verified visually or using electrical, magnetic, optical, acoustic, or other suitable sensing mechanisms.