Rectal Injection Device Multi-Needle Deployment Mechanism
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Solution Overview
Problem
Current gastrointestinal devices, such as biopsy forceps and polypectomy snares, are limited in their efficacy and have seen little developmental progress, failing to effectively address the increasing incidence of lower gastrointestinal diseases like fecal incontinence and hemorrhoids, which impose significant health and financial burdens.
Innovation Solution
A rectal injection device with a handle, extension tube, and multiple needles that can be deployed and retracted to inject therapeutic agents into the rectum, providing improved drug delivery for conditions like fecal incontinence and hemorrhoids, with various embodiments featuring different needle configurations and mechanisms for precise injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-needle injection devices are used, then the device structure is simple, but the treatment efficacy is limited due to inability to perform multiple simultaneous injections
Solution Approach 1:
The injection device is segmented into multiple independent needles (at least two needles) that can be deployed simultaneously from a single device body. Each needle can be independently controlled to penetrate at different locations, enabling multi-site injection therapy for gastrointestinal conditions while maintaining a unified device structure.
Solution Approach 2:
Multiple injection functions are merged into a single device body, allowing simultaneous administration of therapeutic agents through multiple needles. This consolidation improves treatment efficacy by delivering medication to multiple target sites in one procedure while avoiding the need for multiple separate injection devices.
2Reliability
If multiple needles are deployed for simultaneous injection, then treatment efficacy is enhanced, but the device complexity and operational difficulty increase
Solution Approach 1:
The needles are designed with dynamic deployment capability, transitioning from a retracted state during insertion to an extended state during injection. The system allows dynamic control of needle deployment timing and sequence, enabling the operator to adjust the injection process based on patient anatomy and treatment requirements.
Solution Approach 2:
A common drive mechanism serves as an intermediary component that coordinates the deployment and operation of multiple needles. This intermediary mechanism synchronizes the action of multiple needles, simplifying operator control by providing a single actuation point that manages complex multi-needle coordination.
3Reliability
If needles are extended for injection, then drug delivery capability is improved, but the risk of needle-related complications increases
Solution Approach 1:
The needles are pre-positioned in a retracted state within the device body during insertion, eliminating the risk of premature needle deployment or accidental tissue injury during device advancement. The needles are only extended after proper positioning is confirmed, ensuring safe operation.
Solution Approach 2:
The device incorporates protective mechanisms that cushion or protect against potential needle-related complications. This includes controlled deployment sequences that prevent sudden needle extension, and structural design elements that minimize tissue trauma during needle penetration and withdrawal.
Data Source
AI summary
A rectal injection device and a method of operating a rectal injection device. In one embodiment, the device includes: (1) a handle having a trigger associated therewith, (2) an extension tube extending from the handle and terminating in a head, (3) at least two needles coupled to the head and configured to move relative thereto between a retracted position and a deployed position and (4) a pullrod coupling the trigger and the needles and configured to cause the needles to move.