NCT05619575: POLAR

Acceptance and Performance of the CP1170 Sound Processor in Experienced Adult Cochlear Implant Recipients

Completed NA Results posted Last updated 22 August 2025

What this trial tests

NA trial testing CP1170 Sound Processor in Hearing Impairment in 20 participants. Completed in 10 January 2024.

Timeline

20 December 2022

Primary endpoint
7 September 2023

10 January 2024

Quick facts

Lead sponsor	Cochlear
Phase	NA
Status	Completed
Study type	INTERVENTIONAL
Allocation	na
Design	single group
Masking	none
Primary purpose	other
Enrollment	20
Start date	20 December 2022
Primary completion	7 September 2023
Estimated completion	10 January 2024
Sites	1 location across Australia

Drugs / interventions tested

• CP1170 Sound Processor
• CP1150 Sound Processor

Conditions studied

• Hearing Impairment — all drugs for Hearing Impairment →

Sponsor

Cochlear — full company profile →

Who can join

18 and older, any sex, with Hearing Impairment. Patients with the condition only — healthy volunteers not accepted.

Results — posted to ClinicalTrials.gov

Per-arm endpoint measurements with 95% confidence intervals where reported. Source: trial results section.

Paired Difference in dB SRT Between the CP1170 SCAN 2 FF (Automated ForwardFocus ON) and CP1170 SCAN 2 (ForwardFocus OFF) in 65 dB SPL (Sound Pressure Level) S0Nrearhalf 4Talker Babble (Speech Perception in Noise) Primary · During a Single Ad-Hoc Visit (between Day 141 - Day 218)

Speech perception in noise was measured using the Australian Speech Test In Noise (AUSTIN), which is a test that uses Bamford-Kowal-Bench (BKB)-like target sentences presented in adaptive noise. The goal of the speech perception test in noise was to provide the speech-to-noise ratio for 50% speech intelligibility.

CP1170 SCAN 2 FF

Group	Value	95% CI
All Participants	-6.58	-8.38 – -4.77

CP1170 SCAN 2

Group	Value	95% CI
All Participants	-4.58	-6.30 – -2.86

Difference between CP1170 SCAN 2 FF and SCAN 2

Group	Value	95% CI
All Participants	-2.00	-2.82 – -1.18

Paired Difference in dB SRT Between the CP1170 SCAN 2 FF (Automated ForwardFocus ON) and CP1170 SCAN 2 (ForwardFocus OFF) in 65 dB SPL S0N3 Babble (Speech Perception in Noise) Secondary · During a single Ad-Hoc Visit (anytime between Day 141 - Day 218)

Speech perception in noise was measured using the Australian Speech Test In Noise (AUSTIN), which is a test that uses Bamford-Kowal-Bench (BKB)-like target sentences presented in adaptive noise. The goal of the speech perception test in noise was to provide the speech-to-noise ratio for 50% speech intelligibility.

CP1170 SCAN 2 FF

Group	Value	95% CI
All Participants	-4.66	-6.65 – -2.67

CP1170 SCAN 2

Group	Value	95% CI
All Participants	-3.24	-5.29 – -1.18

Difference between SCAN 2 FF and SCAN 2

Group	Value	95% CI
All Participants	-1.43	-2.20 – -0.65

Paired Difference in Percentage CNC (Consonant-nucleus-consonant) Words Correct in Quiet (50 dB) Between the CP1170 Sound Processor and CP1150 Sound Processor (Commercial Version) Secondary · During Ad-Hoc Visit (anytime between Day 127 - Day 190)

Speech perception in quiet was measured using the CNC monosyllabic words at 50 dB SPL from S0 position. The goal of speech perception assessment in quiet was to compare % words correct for each of the conditions.

CP1170 SCAN 2

Group	Value	95% CI
CP1170 Sound Processor	59.06	51.91 – 66.21

CP1150 SCAN

Group	Value	95% CI
CP1170 Sound Processor	56.53	49.09 – 63.97

Difference between CP1170 and CP1150

Group	Value	95% CI
CP1170 Sound Processor	2.53	-0.41 – 5.47

Subjective Acceptance and Satisfaction Between the CP1170 Sound Processor and the Subject's Own Processor Secondary · 2 weeks

Number of participants who were somewhat or very satisfied with the overall sound quality of their SCAN program (SCAN in own sound processor, SCAN 2 FF in CP1170) as indicated through two questionnaires. The CP1170 Questionnaire and Baseline Questionnaire have a 5-point Likert scale for each rating (with the values ranging from: 1 = least favourable option to 3 = Neutral to 5 = most favourable option).

CP1170 Sound Processor

Group	Value	95% CI
All Participants	16

Own Sound Processor

Group	Value	95% CI
All Participants	18

Paired Difference in Global SSQ12 Scores After Experience With the CP1170 Sound Processor and Own Processor Secondary · During a Single Ad-Hoc Visit (anytime between Day 23 - Day 70)

The SSQ12, which measures subjective hearing performance, is comprised of 12 items using the response format on a scale from 0 to 10, where 0 equals no ability and 10 equals perfect ability. These are divided into three sub-scales and the questions 1-5 are from the speech sub-scale, 6-8 from the spatial, and 9-12 from the qualities sub-scale. The three sub-scales are the average of the questions within. A 'not applicable' option is given for each item. The change from baseline is then calculated and the theoretical score could vary between -10 to +10. The higher the score, the higher the benef

CP1170 Sound Processor

Group	Value	95% CI
All Participants	6.07	5.31 – 6.83

Own Sound Processor

Group	Value	95% CI
All Participants	6.06	5.29 – 6.83

Difference between CP1170 and own sound processor

Group	Value	95% CI
All Participants	0.10	-0.52 – 0.72

Adverse events — posted to ClinicalTrials.gov

Time frame: 12 months. Reporting threshold: 0%. Adverse-event reports describe events observed during the trial — not all are caused by the drug.

Adults With a Cochlear Implant

Serious: 0/20 (0%)

Deaths: 0/20

Other adverse events (2 terms — click to expand)

Reaction	System	Adults With a Cochlear Imp…
Ear-related adverse event	Ear and labyrinth disorders	—
Non ear-related	Gastrointestinal disorders	—

Data from ClinicalTrials.gov NCT05619575 adverse events section.

Sponsor's own description

Acceptance and performance of the CP1170 sound processor in experienced adult cochlear implant recipients compared with the CP1150 sound processor and their current sound processor.

Publications & conference data

1 peer-reviewed publication reference this trial (live from Europe PMC):

1. Improved Speech Recognition with Automated ForwardFocus in Cochlear Kanso 3 Sound Processor Users.
   Jones M, Hong W, Schou IM, Mashal ME. · · 2026 · PMID 41884522 · DOI 10.1097/ono.0000000000000087