Patent ID: 7563268
Filing Date: 2009-07-21
Classification: A61B

Abstract:
1. A trocar system comprising: an elongated probe including a first central axis and a tip end configured to be capable of making a puncture hole in living tissue; a cylindrical sheath including tip and base ends, a second central axis and a through hole extending along the second central axis between the tip and base ends of the sheath, the sheath being adapted so that the tip end of the probe projects from the tip end of the sheath, when the probe is inserted in the through hole of the sheath and the first central axis is aligned with the second central axis; a cylindrical dilator including tip and base ends, a third central axis, a through hole extending along the third central axis between the tip and base ends of the dilator, and a puncture hole dilating portion configured to dilate the puncture hole, formed in the living tissue by the tip end of the probe, at the tip end of the dilator, the dilator being adapted so that the tip end of the sheath projects from the tip end of the dilator, when the sheath is inserted in the through hole of the dilator and the second central axis is aligned with the third central axis; a cylindrical trocar including tip and base ends, a fourth central axis and a through hole extending along the fourth central axis between the tip and base ends of the trocar, the trocar being adapted so that the tip end of the dilator projects from the tip end of the trocar, when the dilator is inserted in the through hole of the trocar and the third central axis is aligned with the fourth central axis, with the probe, sheath and dilator being configured to be removable from the through hole of the trocar and the trocar being retained in a patient's body wall, after guiding the trocar between the tip and base ends into the puncture hole formed by the probe; the trocar system comprising an engaging mechanism configured to detachably engage the dilator with the trocar when the dilator is inserted in the trocar; and wherein: the trocar comprises a trocar hold portion configured to be held by an operator; the dilator comprising a dilator insertion portion and a dilator hold portion disposed at the base end of the dilator and configured to be held by the operator; the dilator hold portion comprising: a small diameter portion; and a larger diameter portion, the larger diameter portion positioned closer to the dilator insertion portion and having a smooth curved outer surface configured for comfortable gripping and holding of the dilator portion with a palm of one hand of the operator; the trocar hold portion and the dilator hold portion being interactively configured in a united body, when the trocar is detachably engaged with the dilator, such that the operator is able to grasp and hold both the trocar hold portion and the dilator hold portion with the palm of one hand for one handed puncturing and dilating operation of the trocar system.