Technique for External Repositioning of the Paralyzed Vocal Cord with Silastic Implant

Escajadillo, J.R

doi:10.1177/000348948809700304

Cited by 20 publications

(5 citation statements)

References 16 publications

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“…Some materials in this class of substances are already allowed for long‐term use in bodies; 36 for example, breast implants 37,38 and contact lenses 39,40 . Similar materials are also used for medical prosthetic and cushioning applications 41–43 …”

Section: Methodsmentioning

confidence: 99%

“…39,40 Similar materials are also used for medical prosthetic and cushioning applications. [41][42][43] Note that many materials satisfy some of these criteria but cannot be easily used for MRI measurements of temperature. As mentioned above, the primary reason these materials do not work is that the linewidth is very large and consequently, T * 2 is short.…”

Section: Materials Overviewmentioning

confidence: 99%

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Measurement of sub‐zero temperatures in MRI using T₁ temperature sensitive soft silicone materials: Applications for MRI‐guided cryosurgery

2021

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Purpose: One standard method, proton resonance frequency shift, for measuring temperature using magnetic resonance imaging (MRI), in MRI-guided surgeries, fails completely below the freezing point of water. Because of this, we have developed a new methodology for monitoring temperature with MRI below freezing. The purpose of this paper is to show that a strong temperature dependence of the nuclear relaxation time T 1 in soft silicone polymers can lead to temperature-dependent changes of MRI intensity acquired with T 1 weighting. We propose the use of silicone filaments inserted in tissue for measuring temperature during MRI-guided cryoablations. Methods: The temperature dependence of T 1 in bio-compatible soft silicone polymers was measured using nuclear magnetic resonance spectroscopy and MRI. Phantoms, made of bulk silicone materials and put in an MRI-compatible thermal container with dry ice,allowed temperature measurements ranging from -60 • C to + 20 • C. T 1 -weighted gradient echo images of the phantoms were acquired at spatially uniform temperatures and with a gradient in temperature to determine the efficacy of using these materials as temperature indicators in MRI. Ex vivo experiments on silicone rods, 4 mm in diameter, inserted in animal tissue were conducted to assess the practical feasibility of the method. Results: Measurements of nuclear relaxation times of protons in soft silicone polymers show a monotonic, nearly linear, change with temperature (R 2 > 0.98) and have a significant correlation with temperature (Pearson's r > 0.99, p < 0.01). Similarly, the intensity of the MR images in these materials, taken with a gradient echo sequence, are also temperature dependent. There is again a monotonic change in MRI intensity that correlates well with the measured temperature (Pearson's r < -0.98 and p < 0.01). The MRI experiments show that a temperature change of 3 • C can be resolved in a distance of about 2.5 mm. Based on MRI images and external sensor calibrations for a sample with a gradient in temperature, temperature maps with 3 • C isotherms are created for a bulk phantom. Experiments demonstrate that these changes in MRI intensity with temperature can also be seen in 4 mm silicone rods embedded in ex vivo animal tissue. Conclusions: We have developed a new method for measuring temperature in MRI that potentially could be used during MRI-guided cryoablation operations, reducing both procedure time and cost, and making these surgeries safer.

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Section: Methodsmentioning

confidence: 99%

Section: Materials Overviewmentioning

confidence: 99%

Measurement of sub‐zero temperatures in MRI using T₁ temperature sensitive soft silicone materials: Applications for MRI‐guided cryosurgery

2021

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“…A variety of materials has been used as a prosthesis for fixation: these include silicone (3,6,21,(27)(28)(29)(30)(31)(32)(33)(34)(35), cartilage (17), ceramics (hydroxyapatite) (20), metals such as miniplate (19), and titanium (22) and adjustable silicone (18). Most of the complications associated with the use of silicone, such as migration, exposure, or extrusion into the air-way, result from excessively large or angled shapes, which gradually cut the soft tissue which they are in contact with by continual pressure.…”

Section: Surgical Techniquesmentioning

confidence: 99%

Progress in Laryngeal Framework Surgery

Isshiki¹

2000

Acta Oto-Laryngologica

111

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This paper reviews progress in laryngeal framework surgery since it was first reported about 25 years ago. The success of this type of surgery requires both a basic knowledge of the physiology of phonation, in order to make decisions about the surgical procedure, and surgical skill, in order to accomplish the intended procedure successfully. The main reason for hoarseness is imperfect closure of the glottis, but the second most important reason for hoarseness, increased stiffness of the vocal fold, cannot be corrected by mere medialization of the vocal fold. Laryngeal framework surgery is different in concept from conventional surgery, which is intended to remove the lesion. Controversial points discussed here regarding type I thyroplasty include: (i) whether the cartilage window should be removed; (ii) materials for fixation of the window; and (iii) comparison of type I thyroplasty with arytenoid adduction. A new surgical treatment for spasmodic dysphonia and its results in three patients are described briefly. Surgery for raising the vocal pitch requires further improvement. In the future, laryngeal framework surgery will have wider application in treatment of dysphonias, such as asthenic voice due to atrophy in professional singers or aging, pitch problems in females and gender identity disorder and spasmodic dysphonia.

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“… 13,14 Although the technique is theoretically reversible, foreign body reaction and fibrosis of the surrounding tissue may permanently affect vocal function even after implant removal. 15 By using type I thyroplasty, Netterville et al 16 found that the degree of improvement of voice quality was not as consistent in patients presenting with bilateral bowing. Because of varying drawbacks with all existing materials used for medialization or augmentation of the vocal folds, there is a need to supplant these materials with a more stable, autologous tissue.…”

Section: Introductionmentioning

confidence: 99%

Medialization Laryngoplasty With Strap Muscle Transposition for Vocal Fold Atrophy with or without Sulcus Vocalis

Su¹,

Tsai²,

Chiu³

et al. 2004

The Laryngoscope

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Technique for External Repositioning of the Paralyzed Vocal Cord with Silastic Implant

Cited by 20 publications

References 16 publications

Measurement of sub‐zero temperatures in MRI using T₁ temperature sensitive soft silicone materials: Applications for MRI‐guided cryosurgery

Measurement of sub‐zero temperatures in MRI using T₁ temperature sensitive soft silicone materials: Applications for MRI‐guided cryosurgery

Progress in Laryngeal Framework Surgery

Medialization Laryngoplasty With Strap Muscle Transposition for Vocal Fold Atrophy with or without Sulcus Vocalis

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Technique for External Repositioning of the Paralyzed Vocal Cord with Silastic Implant

Cited by 20 publications

References 16 publications

Measurement of sub‐zero temperatures in MRI using T1 temperature sensitive soft silicone materials: Applications for MRI‐guided cryosurgery

Measurement of sub‐zero temperatures in MRI using T1 temperature sensitive soft silicone materials: Applications for MRI‐guided cryosurgery

Progress in Laryngeal Framework Surgery

Medialization Laryngoplasty With Strap Muscle Transposition for Vocal Fold Atrophy with or without Sulcus Vocalis

Contact Info

Product

Resources

About

Measurement of sub‐zero temperatures in MRI using T₁ temperature sensitive soft silicone materials: Applications for MRI‐guided cryosurgery

Measurement of sub‐zero temperatures in MRI using T₁ temperature sensitive soft silicone materials: Applications for MRI‐guided cryosurgery