Experiments with Pulsed Magnets for the Extraction of Intraocular Foreign Bodies

Landwehr, G.; Dietrich, Katharina; Weber, H.P.; Buschmann, W.; Neubauer, H.

doi:10.1159/000264899

Cited by 6 publications

(1 citation statement)

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“…Due to the special structure of the vitreous, its mechanical properties cannot really be considered as visco-elastic. Experiments with foreign bodies implanted into pig eyes and the eyes of human donors showed [3] that under certain circumstances the vitreous can be regarded as rubber-elastic.…”

Section: Introductionmentioning

confidence: 99%

A New Method for the Determination of the Mechanical Properties of the Vitreous

Weber¹,

Landwehr²

1982

Ophthalmic Res

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In order to determine the mechanical properties of the vitreous which are characteristic for the extraction of foreign bodies, an oscillatory method was devised. The mechanical properties are described by a spring constant – relevant for the rubber elastic behaviour – and a friction constant characterizing the dissipative interaction inside the vitreous. The appropriateness of the data is demonstrated by the capability to predict the distance-time behaviour in strong, pulsed magnetic fields of ferromagnetic foreign bodies implanted into the vitreous of pig eyes.

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Section: Introductionmentioning

confidence: 99%

A New Method for the Determination of the Mechanical Properties of the Vitreous

Weber¹,

Landwehr²

1982

Ophthalmic Res

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Chirurgie bei Verletzungen des Augapfels

Heimann¹,

Kilp²,

Neubauer³

1988

Augenärztliche Operationen

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Experimental determination of the force required for insertion of a thermoseed into deep brain tissues

et al. 1990

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Our laboratories are developing a new technique for delivering localized hyperthermia to deep-seated brain tumors. In this technique, a spherical thermoseed is stereotactically navigated through the brain and tumour tissues via the noncontact application of an external magnetic force. The force required to produce motion of a 3 mm diameter sphere through in vitro brain tissues was measured to be 0.07 +/- 0.03 N. This result was obtained from a series of experiments performed on whole brain specimens extracted from adult canines. Data were also taken with a 3 mm x 3 mm cylinder and a 5 mm sphere. An experimental procedure simulating physiological conditions was developed prior to testing. Evaluations of systematic effects included determinations of the calibration uncertainties, tests of the dependence of the measured force on temperature, and studies of the effects of method of storage of the tissue specimens. The results obtained are compared with (and confirmed by) two different series of experiments performed in vivo on adult canines and with another series of experiments using brain phantom gelatin.

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Experiments with Pulsed Magnets for the Extraction of Intraocular Foreign Bodies

Cited by 6 publications

References 1 publication

A New Method for the Determination of the Mechanical Properties of the Vitreous

A New Method for the Determination of the Mechanical Properties of the Vitreous

Chirurgie bei Verletzungen des Augapfels

Experimental determination of the force required for insertion of a thermoseed into deep brain tissues

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