PROBLEM TO BE SOLVED: To provide a cannula of a novel configuration, capable of suppressing discharge speed, while securing a flow rate of blood to be discharged.SOLUTION: A cannula 10 includes: a projection 56 that projects from a tip-end closing part 50 for closing an internal flow passage 16 at a tip end face, formed at an inner peripheral side of a peripheral wall 22 at a tip end where a plurality of discharge ports 64 are provided and a turning part 58 at which an inclination angle of an outer peripheral surface 59 of the projection 56 is reduced, formed at an outer peripheral side of the projection 56 in the tip-end closing part 50. At least a tip-side end of a columnar part 44 that extends in the length direction between the plurality of discharge ports 64 adjoined to each other in the circumferential direction, is defined as an opening regulation part 48 or 78 that regulates an opening width of each discharge port 64 so as to continue blood flows discharged by being guided by the turning part 58, to each other in the circumferential direction.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】吐出される血液の流量を確保しつつ吐出速度を抑えることができる、新規な構造のカニューレを提供する。【解決手段】カニューレ10において、複数の吐出口64が設けられた先端部分の周壁22の内周側には、内部流路16を先端面において閉鎖する先端閉鎖部50から突出する突出部56が設けられていると共に、先端閉鎖部50における突出部56の外周側部分には、突出部56の外周面59の傾斜角度が小さくされた変向部58が形成されている一方、互いに周方向で隣り合う前記複数の吐出口64の間を長さ方向に延びる柱状部分44における少なくとも先端側の端部が、各該吐出口64の開口幅を規定することにより変向部58で導かれて吐出される血流を周方向で相互に連続させる開口規定部48,78とされている。【選択図】図3
