For clinicians · Research overview

Verifiable therapy. Legible data.

VertiBand is a closed-loop guidance system for the Epley maneuver. It verifies each positional stage against a reference trajectory from a head-mounted 9-axis IMU sampling at 100 Hz, cues the patient adaptively, and emits a structured session log suitable for chart review or population analysis.

01 · Measurement

1.9° mean angle error.

Sensor orientation is resolved by a complementary filter over the gyroscope + accelerometer pair, cross-validated against a reference inclinometer across self-trials. End-to-end latency from pose change to audio cue is below 80 ms.

02 · Method

Closed-loop stage verification.

Each Epley stage unlocks only when head orientation is within ±15° of the target pose and sustained for the configured hold time (default 30 s). Nystagmus band-power (1–3 Hz) is estimated from the yaw-rate spectrum during each hold and logged as a per-stage biomarker.

A post-session VertiScore combines alignment latency, hold compliance, angular stability, precision, and end-of-hold drift into an interpretable 0–100 composite. A recovery-probability estimator maps the feature set to a calibrated probability of resolution.

03 · Clinical note

SOAP format, one JSON away.

At the end of each session, Gemini 2.5 generates a plain-language clinical note from the structured log. Here is a real sample from a right-sided session at VertiScore 84, Grade B, 20% predicted resolution.

Session 20260417-1741 · Right-side EpleyVertiScore 84 · Grade B

Subjective Patient reports morning positional vertigo onset approximately four days ago, triggered on lying back. Moderate intensity, resolves within 30 seconds. Objective Five-stage right-sided Epley maneuver completed. Alignment achieved within 1.5–3.0 seconds per stage. Step 2 (Dix-Hallpike) held 28 of 30 seconds with 11° mean pose drift. Nystagmus band ratio peaked at 94× baseline during step 2 and decayed to 6× by step 4, consistent with right posterior-canal canalithiasis. Assessment Active right-sided BPPV with expected response to canalith-repositioning. Session quality moderate; alignment on step 4 was outside tolerance for 8 s. Plan Repeat session in 24 hours. Focus on earlier alignment on step 4 and slower transitions between positions. Recovery probability this series: 20%. Consider Semont variant if two further sessions do not reduce peak nystagmus ratio below 30×.

04 · Data schema

Every session, one file.

Every session produces a JSON document conforming to the following shape. All angles in degrees, times in seconds, timestamps ISO-8601.

// session.schema.json
{
  "session_id": "20260418-0703-right",
  "side": "right",
  "start_time": "2026-04-18T07:03:22-05:00",
  "end_time":   "2026-04-18T07:06:04-05:00",
  "device": { "model": "VertiBand V-01", "firmware": "1.3.2" },
  "baseline_gyro_noise": {
    "band_power_1_3hz": 0.041,
    "noise_floor_deg_s":  0.18
  },
  "steps": [
    {
      "name":          "step1",
      "description":   "Turn head 45° right",
      "target":        { "pitch": 0, "roll": 0, "yaw": 45 },
      "hold_target_s": 30,
      "align_time_s":  1.52,
      "hold_actual_s": 30.0,
      "sway": {
        "sway_area_deg2":      6.8,
        "path_length_deg":     41.2,
        "mean_velocity_deg_s":  1.37,
        "rms_gyro_deg_s":       5.7,
        "f50_hz": 1.2, "f95_hz": 3.6,
        "drift_deg":            2.0,
        "aligned_fraction":     0.92
      },
      "events": [ { "t": 2.1, "kind": "nystagmus", "detail": "ratio=6.4" } ]
    }
    // ...steps 2–5
  ],
  "vertiscore":             84.3,
  "grade":                  "B",
  "recovery_probability":   0.20,
  "nystagmus_peak_ratio":   94.2,
  "ai_summary":             "Patient completed right Epley..."
}

05 · Access & integration

HL7-adjacent, zero lock-in.

Sessions are exportable as JSON or as a flat CSV of sway metrics for population analysis. A simple HTTP endpoint can POST to any EMR configured to accept custom observations. The device stores the last 20 sessions on-band; sync is opt-in and revocable.

For research partnerships or early-access evaluation, contact clinicians@vertiband.com.