| 摘要 |
<p>A therapy delivery system for the intermittent delivery of biologics, chemicals, or pharmaceuticals into tissues involves a chronically implantable guide tube having a guide cannula with a proximal and a distal end, an access port mounted on the proximal end of the guide cannula and adapted for chronic implantation into a patient, a first stop mounted near the distal end of the guide cannula and a delivery cannula insertable into the lumen of the guide cannula through the access port. The delivery cannula mechanically interacts with the first stop and is designed to prevent the delivery cannula from extending beyond a predetermined distance from the distal end of the guide cannula. A tissue-piercing tip may be attached to the distal end of the delivery cannula. A stylet may be used to occupy the lumen of the guide cannula when the delivery cannula is not in use.</p> |
