Contrast agents comprising gas-containing or gas-generating polymer microparticles or microballoons
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United States of America Patent
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Oct 7, 1997
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N/A
app pub date -
Sep 6, 1994
filing date -
Mar 6, 1992
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Abstract
Contrast agents comprising gas-containing or gas-generating polymer microparticles and/or microballoons, in which the polymer is a biodegradable polymer containing units of formula --(O).sub.m --CO--O--C(R.sup.1 R.sup.2)--O--CO--(O).sub.n -- (wherein R.sup.1 and R.sup.2 each represent hydrogen or a carbon-attached monovalent organic group or together form a carbon-attached divalent organic group, and m and n are each independently zero or one) may be used in diagnostic applications such as ultrasound and MR imaging.
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