Ingestible Capsule Beads for Site-Directed GI Sampling
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Solution Overview
Problem
Current methods for sampling the gastrointestinal tract's microbiome, such as analyzing fecal matter, lack spatial resolution and are often invasive, making it difficult to understand how bacteria interact with the host and each other.
Innovation Solution
An ingestible capsule with hydrophilic beads that absorb gut fluids, swell, and block the capsule's openings, allowing for non-invasive sampling of specific regions of the gastrointestinal tract while preventing leakage and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fecal matter analysis is used to sample the microbiome, then sampling can be performed non-invasively, but spatial resolution is lost and location information is discarded
Solution Approach 1:
The capsule is divided into multiple sampling chambers (first chamber, second chamber, third chamber) that can independently sample at different locations along the gastrointestinal tract. Each chamber can be selectively activated or sealed to capture samples from specific regions, thereby maintaining spatial resolution while preserving the non-invasive nature of the procedure.
Solution Approach 2:
Different chambers are designed with different properties to sample different regions. The first chamber samples the stomach environment, while subsequent chambers sample the intestinal environment. This local differentiation allows each chamber to be optimized for its specific sampling location, preserving spatial information while maintaining non-invasive operation.
2Measurement precision
If invasive procedures such as surgery, biopsy, or endoscopy are used to sample the gastrointestinal tract, then spatial resolution is improved, but patient cooperation and procedural complexity increase
Solution Approach 1:
The capsule autonomously performs sampling operations as it travels through the gastrointestinal tract. The peristaltic motion of the gut naturally drives the capsule forward and controls the timing of sample collection in different chambers, eliminating the need for external control or complex procedural intervention. The capsule self-regulates the sampling process based on its position and environmental conditions.
Solution Approach 2:
The capsule employs dynamic valve mechanisms that can open or close based on environmental conditions (such as pH changes) or timing. This dynamic control allows the capsule to automatically sample at different locations without requiring complex external coordination, reducing procedural complexity while maintaining spatial resolution.
3Productivity
If the capsule openings remain open to allow fluid entry, then sampling is enabled, but leakage and contamination of the sample occur
Solution Approach 1:
The capsule is pre-loaded with absorbent beads in each chamber before ingestion. When the capsule reaches the target location and fluid enters, the beads immediately begin absorbing the sample, preventing leakage. The preliminary preparation of the absorbent material ensures that sampling efficiency is maintained while sample integrity is protected from the moment fluid contact occurs.
Solution Approach 2:
The absorbent beads act as an intermediary between the fluid sample and the capsule chamber. The beads absorb and hold the sample within their porous structure, preventing direct contact between the fluid and the capsule walls or other chambers. This intermediary mechanism enables continuous sampling while maintaining sample integrity and preventing contamination.
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 capsule enables site-directed sampling and analysis of the gastrointestinal tract's microbiome, providing valuable insights into bacterial interactions and health status without the need for invasive procedures.
Implementation Method 1
hydrophilic beads inside the capsule. The capsule has openings that allow gut fluids to enter. As the fluid enters, the beads absorb it and swell up.
Implementation Method 2
the beads absorb it and swell up. In doing so, they eventually swell up enough to close off the openings in the capsule.
Data Source
AI summary
An ingestible capsule for sampling liquid in the gastrointestinal tract includes an inlet and a valve. The valve includes an actuator bead that absorbs liquid. As it does so, it swells. This swelling closes the valve, thus preventing further liquid from entering the capsule.