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Design only · h.r.3.3 PDK

Nitrite Urinalysis Chip

nitrite

Urinary nitrite assay chip.

H.R.3.3 design, made by the design software

Designed by Erica Francis · Gale Lab, University of Utah

Nitrite Urinalysis Chip. A computer render of the design, not a photograph: its body drawn see-through, its channels in orange. The chip is 19.4 mm × 12.2 mm × 3.8 mm. On its top face stands its connector, a pedestal with 32 bores between two blocks, drawn in a darker tint. Beside it, a cross-section where it crosses the most channels, and a 2 mm window around them, marked on the section.
Rendered from its design files, not photographed: the body see-through, the channels orange, and its cross-section beside it. Pictures in one family share one scale.

Geometry

Top view of the Nitrite Urinalysis Chip, generated from OpenSCAD source Isometric view of the Nitrite Urinalysis Chip, generated from OpenSCAD source

Top view (left) and isometric view (right) of the placed-and-routed chip. Rendered with OpenSCAD from the chip’s SCAD source, nitrite_reroute.scad. Click for high-resolution.

Download: PNG (top) · PNG (iso) · SCAD source ↓

Prints

Our account By Erica’s account (Gale Lab), this chip was printed and tested in 2025. Her two copies of its design file, one dated 9 May 2025 and a later one, render the same chip as the file offered here.

Source: Erica’s account, given on 2026-10-08, and no file.

Specifications

Inputs
3 (soln1, soln2, soln3)
Outputs
1 (out)
Mixers
2 × diffmix_25px_0
Serpentine channels
3 (p_serpentine_0 × 3 — see pcell manifest)
Substrate
2550 × 1600 × 230 (h.r.3.3 PDK)
Standard cells
diffmix_25px_0, p_serpentine
Status
H.R.3.3 design, made by the design software

Assay

This chip is designed for a urinary nitrite assay. Three liquids enter at soln1, soln2 and soln3, each through its own serpentine channel, whose length sets its share of the flow; two mixers join them in two stages, and the mixed product leaves at out.

Files

nitrite_reroute.scad is the placed-and-routed 3D geometry — the main OpenSCAD source for this chip. h.r.3.3_nitrite_pcells.lef contains chip-specific cell abstracts. pcell_out_scad lists the parametric serpentine-channel variants this chip required (with L1 / L2 / turn count). The PNG renders are high-resolution versions of the views shown in the Geometry section above.

Papers

  • Related methodology archetype

    Goenner, B., Temple, S., Zapata, S., Wakeham, D., Snelgrove, A., Gaillardon, P.-E., Nordin, G. P., & Gale, B. K. (2025). An open source platform to automate the design, verification, and manufacture of 3D printed microfluidic devices. Scientific Reports, 15, 33077. DOI: 10.1038/s41598-025-15976-9

Applications

For research use only. Not for use in diagnostic procedures.

A design for a urinary nitrite assay. One of the urinalysis chip designs in the Gale Lab urinalysis chip family (Erica Francis).

Tags

  • chip
  • demo
  • continuous-flow
  • h.r.3.3
  • urinalysis
  • nitrite-assay
  • passive-metering
  • multi-input

Citation

Erica Francis, Gale Lab, University of Utah

See the Papers section above for the related methodology archetype citation.

Design files from the public openmfda_flow repository (utah-MFDA), commit cc5dfc5 of 29 May 2026, on its urinalysis_suite_automation branch.