RetracTOR/ Retractor for Image Guided Trans-Oral Surgery

In Vivo Evaluation of a CT-Compatible Retractor for Image Guided Trans-Oral Surgery

This study aims to demonstrate that a polymer retractor functions the same as a standard metal retractor used during endoscopy and throat surgery. The retractor is the device that holds the mouth open so the surgeon can easily access the mouth and throat. For example, this study aims to confirm that the mouth is held open the same amount with a polymer retractor as it is with a metal retractor. Benchtop experiments have demonstrated that the metal and polymer retractor's function the same, and thus this study will use this in patients.

Study Overview

• Status: Recruiting
• Conditions: Oral Cavity Disease

Detailed Description

This study will include four stages of data collection: 1) Subject history, 2) intraoperative surgical working volume (SWV) assessment with stereoendoscopy and standard-of-care metal retractor, 3) intraoperative surgical working volume assessment with stereoendoscopy and 3D-printed polymer retractor, 4) intraoperative surgical working volume assessment with CT-imaging and 3D-printed polymer retractor.

The investigators will conduct a comparative study examining differences in surgical exposure within the same patient when retraction is enabled through use of standard-of-care metal retractor vs. our 3D printed retractor. Patients to be recruited for the study will include those who present to the Head and Neck Tumor Clinic at Dartmouth-Hitchcock Medical Center (DHMC) with suspicious lesions identified in the oropharynx, hypopharynx or larynx. Currently the clinic sees about 20 patients per month that are scheduled for staging endoscopy in the operating room. Consent will be obtained from all participating subjects prior to participation.

All surgeries will be performed at the Center for Surgical Innovation. Prior to surgery a standard-of-care Feyh-Kastenbauer (FK) or Crowe-Davis (CD) metal retractor will be positioned in the mouth of the patient and stabilized in suspension. A standard-of-care stereo vision endoscope will capture images of the oral cavity so that a 3D volume of the surgical working volume (SWV) can be measured. The time to place the retractor and surgical working volume metrics based on stereovision derived oral-cavity volumes and inter-incisive distance (IID) will be recorded. The FK and/or CD retractor will then be removed and replaced with our custom 3d-printed radiolucent retractor. The time to place this retractor and surgical working volume metrics based on stereovision derived oral-cavity volumes and inter-incisive distance will be recorded. A single CT scan with IV contrast will be obtained with the retractor in place and suspended. The standard surgical procedure will commence following routine methods. Following surgery, a second set of surgical working volume metrics based on stereovision derived oral-cavity volumes and inter-incisive distance will be recorded.

• Study Type: Observational
• Enrollment (Estimated): 20

Contacts and Locations

• Study Contact: Name: Kathy J Phipps, BA; Phone Number: 603 646-5793; Email: kathy.j.phipps@dartmouth.edu
• Study Contact Backup: Name: Ryan J Halter, PhD; Phone Number: 603 646-0773; Email: Ryan.J.Halter@dartmouth.edu

Study Locations

• United States
  • New Hampshire
    • Lebanon, New Hampshire, United States, 03756
      • Recruiting
      • Dartmouth-Hitchcock Medical Center
      • Contact: Joseph Paydarfar, MD; Phone Number: 603-650-8123; Email: joseph.a.paydarfar@hitchcock.org

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

• Sampling Method: Non-Probability Sample

Study Population

Clinical diagnosis or suspected cancer the oral cavity, oropharynx, hypopharynx, or larynx requiring resection.

Description

Inclusion Criteria:

1. Clinical diagnosis or suspected cancer the oral cavity, oropharynx, hypopharynx, or larynx requiring resection.
2. Undergoing staging endoscopy at DHMC
3. Ability to understand and the willingness to sign a written informed consent document.
4. Age ≥ 18 years old
5. For females of child bearing potential, a negative pregnancy evaluation per standard of care.

Exclusion Criteria:

1. Prisoners
2. Adults with impaired decision-making capacity
3. Any condition for which, in the opinion of the investigator, contraindicates study participation.

4. Procedures that use high temperature generating devices such as laser

   -

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort
custom device- radiolucent retractor; Custom device-radiolucent retractor used during staging endoscopy.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Comparing intraoperative surgical working volume (SWV) of a radiolucent retractor (custom device) as compared to SWV of standard-of-care metal retractors.	Assessment of intraoperative surgical working volume (SWV) during stereoendoscopy using standard-of-care metal retractor as compared to the same assessment parameters using 3D-printed polymer retractor during stereoendoscopy. Assessments will also include intraoperative SWV with CT-imaging taken with 3D-printed polymer retractor.	2024-2025

Collaborators and Investigators

• Sponsor: Ryan J. Halter
• Collaborators: Dartmouth College
• Investigators: Principal Investigator: Ryan J Halter, PhD, Dartmouth-Hitchcock, Lebanon

Study record dates

Study Major Dates

• Study Start (Actual): February 25, 2025
• Primary Completion (Estimated): December 31, 2027
• Study Completion (Estimated): December 31, 2027

Study Registration Dates

• First Submitted: April 17, 2024
• First Submitted That Met QC Criteria: April 19, 2024
• First Posted (Actual): April 24, 2024

Study Record Updates

• Last Update Posted (Actual): April 7, 2026
• Last Update Submitted That Met QC Criteria: April 1, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Keywords: retractor
• Additional Relevant MeSH Terms: Stomatognathic Diseases; Mouth Diseases
• Other Study ID Numbers: STUDY02002103

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No