FluidAI Stream™ Surgical Monitoring System

FluidAI’s Stream™ platform is a surgical monitoring system for clinical teams that detects early post-operative complications by integrating precision fluid sensing, molded flow channels, and a bedside-ready enclosure architecture.

The Challenge:

FluidAI’s Stream™ platform was clinically validated and advancing toward scaled production when early builds began exposing instability at critical mechanical interfaces.

Pressure testing revealed the flow channel pin shifting under load, despite components meeting drawing tolerances. Comparative measurement showed a consistent geometric shift in new tool output relative to prior samples, indicating systematic tooling variation rather than isolated part defects.

At the same time, PCB retention looseness was traced to dimensional stack-up differences between CAD intent and legacy reference samples, masking the true nominal condition. TPE over mold short-shot behavior further signaled insufficient structural support within the tooling architecture.

Individually, these issues appeared incremental. Collectively, they revealed a breakdown in dimensional alignment between design intent, tooling geometry, and supplier capability – introducing functional risk and threatening repeatable, scalable manufacturing.

The Approach:

The work centered on disciplined design-for-manufacturing (DFM) correction followed by full tooling rebuild to restore production-intent geometry at scale.

Dimensional Reconciliation & Nominal Re-Definition

Legacy samples, new tool outputs, and 3D CAD were systematically compared to quantify geometric drift and isolate systematic variance. Critical functional features – including the pressure-sensitive flow channel interface – were re-baselined against validated measurement data.

Nominal dimensions and tolerances were redefined to align with demonstrated supplier process capability rather than historical assumptions. This eliminated ambiguity between drawing specification and achievable process control.

DFM Refinement of Retention and Support Features

Enclosure retention interfaces and PCB engagement features were reviewed through a full system-level stack-up analysis. Geometry was corrected at nominal condition to eliminate assembly looseness without reliance on master-sample bias or downstream compensation.

For the TPE overmold, structural support and tab architecture were redesigned to resolve short-shot behavior and stabilize injection performance while respecting tooling constraints and cycle integrity.

Only after dimensional intent and functional stack-ups were fully reconciled was tooling intervention authorized.

Full Tooling Rebuild to Production Intent

The affected molds were rebuilt to eliminate systematic geometric offset and restore dimensional control. Tool geometry was revised to reflect corrected nominal targets and tightened tolerance bands aligned with verified supplier capability.

This reset ensured that production output matched true design intent – not legacy deviation – and established a repeatable, scalable manufacturing baseline.

Supplier & Documentation Alignment

Engineering change documentation, drawing updates, and supplier coordination were synchronized to ensure traceable implementation. Tolerances were tightened where justified by process capability, reinforcing long-term production stability.

The objective was not incremental adjustment.It was structural realignment between design intent, tooling geometry, and supplier capability

The Outcome:

By correcting tooling geometry and tightening dimensional control at the source, FluidAI converted unstable production variability into controlled, repeatable output. What had required scrutiny during builds became a predictable manufacturing system aligned with supplier capability and production intent

Stabilized Critical InterfacesTargeted mold refinement and clarified nominal definition restored integrity to pressure-sensitive interfaces

Restored Assembly Retentio Stack-up variance was resolved at the geometry level rather than compensated downstream, re-establishing enclosure engagement and PCB stability

Improved Molding Consistenc Structural reinforcement eliminated marginal overmold behavior, improving injection reliability and long-term durability

The system achieved

Corrected dimensional drift in pressure-sensitive feature
Alignment of drawing tolerances with verified supplier capabilit
Reinforced support geometry to eliminate short-shot ris
Tooling corrections executed without full mold replacemen
Reduced reliance on inspection-based compensatio

With dimensional discipline re-established, the Stream platform moved from variable early production output to a stable, scalable manufacturing architecture protecting unit economics, supplier alignment, and long-term supply reliability

Services Provided

Mechanical Design

Quality Management

Design For Manufacturing

Low Volume Manufacturing & Pilot Builds

Manufacturing Transfer & Launch

Supply Chain Management

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