Insulin Infusion Cannula Agents for Foreign-Body Response Control
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Solution Overview
Problem
Diabetic patients experience frequent site-loss and occlusion of infusion sets due to foreign-body responses to implanted cannulas or catheters, leading to unreliable insulin delivery and reduced insulin sensitivity at infusion sites.
Innovation Solution
The use of response-inhibiting agents such as heparin, dextran, and rapamycin, administered through various delivery profiles and locations, to mitigate coagulation, inflammation, and encapsulation at the infusion site, thereby extending the duration of effective insulin delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cannula or catheter is implanted for continuous insulin delivery, then insulin can be delivered continuously to diabetic patients, but foreign-body responses occur causing site-loss and occlusion
Solution Approach 1:
The patent applies preliminary anti-action by pre-coating the cannula or catheter surface with anti-inflammatory agents (such as heparin, dexamethasone, or other corticosteroids) before implantation. This preventive coating inhibits the foreign-body response and inflammatory reactions before they can develop, thereby preventing site-loss and occlusion while maintaining reliable insulin delivery over extended periods
2Loss of time
If the infusion site is maintained for multiple days, then frequent site changes are reduced, but inflammation and fibrous tissue buildup occur
Solution Approach 1:
The patent implements preliminary action by applying anti-inflammatory coatings or agents to the cannula surface prior to insertion. This advance preparation prevents the inflammatory cascade and fibrous tissue formation that would normally limit site duration, enabling the infusion site to be maintained for multiple days without significant inflammation or occlusion
Solution Approach 2:
The patent uses anti-inflammatory agents as intermediary substances between the foreign body (cannula) and the host tissue. These intermediary agents mediate the interaction by suppressing the immune response and preventing direct harmful contact between the cannula surface and surrounding tissues, thereby extending site maintenance duration
3Reliability
If scar tissue builds up around the cannula, then the cannula becomes occluded, but continuous insulin delivery is required
Solution Approach 1:
The patent applies preliminary anti-action by pre-coating the cannula with anti-inflammatory and anti-fibrotic agents before implantation. This preventive measure inhibits the formation of scar tissue and fibrous encapsulation that would lead to occlusion, thereby maintaining cannula patency and ensuring continuous insulin delivery over the intended duration
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
The described systems and methods inhibit foreign-body responses, allowing for prolonged insulin delivery at a single site for at least 7 days, reducing site-loss and improving insulin absorption reliability.
Implementation Method 1
The use of response-inhibiting agents such as heparin, dextran, and rapamycin, administered through various delivery profiles and locations, to mitigate coagulation, inflammation, and encapsulation at the infusion site
Data Source
AI summary
Methods and devices are provided for reducing a diabetic patient's foreign body immune response, including infusion site-loss and/or occlusion. Such foreign body responses are associated with the treatment of the diabetic patient where the treatment requires subcutaneous implantation of a foreign body, such as a cannula or catheter. In certain embodiments of the invention, a response-inhibiting agent is administered to a patient at the site of cannula/catheter insertion, thereby facilitating delivery of insulin to the diabetic patient and mitigating site-loss and/or occlusion over a period of time.