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Research Papers

Integrated Device for in Vivo Fine Needle Aspiration Biopsy and Elastic Scattering Spectroscopy in Preoperative Thyroid Nodules

[+] Author and Article Information
John C. Briggs

Fraunhofer USA–CMI,
Brookline, MA 02446

Ousama A’amar, Irving Bigio

Department of Biomedical Engineering,
Boston University,
Boston, MA 02215

Jennifer E. Rosen

Department of Surgery,
Section of Surgical Oncology
and Surgical Endocrinology,
School of Medicine,
Boston University,
Boston, MA 02118

Stephanie L. Lee

Department of Medicine,
Section of Endocrinology,
Diabetes, and Nutrition,
School of Medicine,
Boston University,
Boston, MA 02118

Andre Sharon

Fraunhofer USA–CMI,
Brookline, MA 02446;
Department of Mechanical Engineering,
Boston University,
Boston, MA 02215

Alexis F. Sauer-Budge

Fraunhofer USA–CMI,
Brookline, MA 02446;
Department of Biomedical Engineering,
Boston University,
Boston, MA 02215

Manuscript received August 30, 2013; final manuscript received January 16, 2014; published online March 7, 2014. Assoc. Editor: Carl A. Nelson.

J. Med. Devices 8(2), 021003 (Mar 07, 2014) (6 pages) Paper No: MED-13-1201; doi: 10.1115/1.4026577 History: Received August 30, 2013; Revised January 16, 2014

Thyroid nodules are a frequent clinical finding and the most common endocrine malignancy is thyroid cancer. The standard of care in the management of a patient with a thyroid nodule is to perform a preoperative fine needle aspiration (FNA) biopsy of the suspect nodule under ultrasound imaging guidance. In a significant percentage of the cases, cytological assessment of the biopsy material yields indeterminate results, the consequence of which is diagnostic thyroidectomy. Unfortunately, 75–80% of diagnostic thyroidectomies following indeterminate cytology result in benign designation by post-surgery histopathology, indicating potentially unnecessary surgeries. Clearly, the potential exists for the improvement in patient care and the reduction of overall procedure costs if an improved preoperative diagnostic technique was developed. Elastic scattering spectroscopy (ESS) is an optical biopsy technique that is mediated by optical fiber probes and has been shown to be effective in differentiating benign from malignant thyroid tissue in ex vivo surgical tissue samples. The goal of the current research was to integrate the ESS fiber optic probes into a device that can also collect cells for cytological assessment and, thus, enable concurrent spectroscopic interrogation and biopsy of a suspect nodule with a single needle penetration. The primary challenges to designing the device included miniaturizing the standard ESS fiber optic probe to fit within an FNA needle and maintaining the needle’s aspiration functionality. We demonstrate the value of the fabricated prototype devices by assessing their preliminary performance in an on-going clinical study with >120 patients. The devices have proven to be clinically friendly, collecting both aspirated cells and optical data from the same location in thyroid nodules and with minimal disruption of clinical procedure. In the future, such integrated devices could be used to complement FNA-based cytological results and have the potential to both reduce the number of diagnostic thyroidectomies on benign nodules and improve the surgical approach for patients with thyroid malignancies, thereby, decreasing healthcare costs and improving patient outcomes.

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Figures

Grahic Jump Location
Fig. 1

Prototype FNA probe alongside standard syringe used for FNA

Grahic Jump Location
Fig. 4

Photograph of the end of the fiber optic probe. Outer diameter is approximately 344 μm.

Grahic Jump Location
Fig. 5

Photograph of the device in the calibrator

Grahic Jump Location
Fig. 6

FNA optical probe being used on a patient. The ultrasound probe (left hand) has a protective latex covering and guides the needle of the integrated optical probe to the target nodule for biopsy.

Grahic Jump Location
Fig. 7

Example ESS Spectra from in vivo measurement of thyroid nodule

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