| 摘要 |
<p>Provided is a highly safe medical apparatus having a catheter which is to be inserted into a non-lumenous area of biological tissue so as to deliver a substance into the biological tissue, such that backflow of the substance along the outer surface of the catheter is suppressed with as little damage as possible to the biological tissue, and displacement and slipping of the catheter is suppressed. The medical apparatus (1) is inserted into a non-lumenous area of biological tissue in order to deliver a substance into the biological tissue and comprises a catheter (10). The catheter has a longitudinally-extending tube portion (20) and an expanding portion (30) expandable outwardly in a radial direction of the tube portion (20), the expanding portion (30) being formed on the outer surface of the tube portion (20) and extending from the leading end of the tube portion (20) towards the base end of the same at a length of 30% or more of the insertable length (L) of the tube portion (20) with respect to the biological tissue. In the catheter, a delivery lumen (21) for delivering the substance and an expanding lumen (22) for allowing flow of a fluid for expanding the expanding portion (30) inwardly of the expanding portion (30) are formed.</p> |
