Cannula tip for an arterial cannula

Patent metadata

Field	Value
Publication number	US-9662432-B2
Application number	US-201314404049-A
Country	US
Kind code	B2
Filing date	May 28, 2013
Priority date	Jun 1, 2012
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A novel arterial cannula tip includes an elongated body having an expanded four-lobe swirl inducer and a diverging diffuser. The swirl inducer presents micro-scale blood-wetting features that help to enhance the jet or core of the flow of blood sufficiently to delay the onset of turbulence and facilitate a strongly coherent blood outflow jet as it enters the cannulated artery, while the diverging diffuser reduces exit force and promotes and laminar flow which mitigates intimal vascular damage owing to high wall shear stresses at regions of jet impingement. When used in conjunction with an aortic cannula, the device facilitates neuroprotection by way of improved cerebral perfusion.

First claim

What is claimed is:

1. A cannula tip for a cannula for conveying blood in a downstream direction into an artery, said cannula tip having an inlet having a first predetermined diameter, a longitudinal axis, a body portion, and a diverging portion having a second predetermined diameter, and wherein
said body portion includes a swirl inducing means downstream from said inlet for causing the rotation of a flow of said blood within said cannula tip around said longitudinal axis,
said swirl inducing means has a third predetermined diameter which is at least about three times said first predetermined diameter of said inlet, and
said swirl inducing means is able to cause blood flowing in said cannula tip to undergo at least about a 360 degree rotation about said longitudinal axis.

2. The cannula tip of claim 1 wherein said swirl inducing means includes a diverging profile followed by a converging profile.

3. The cannula tip of claim 1 wherein said artery is an aortic artery.

4. A cannula tip for a cannula for conveying blood in a downstream direction into an aorta, said cannula tip having an inlet portion having a first predetermined diameter, a longitudinal axis, a diverging portion serving as an outlet having a second predetermined diameter for directing a flow of blood into said aorta, a body portion situated between said inlet and said diverging portion, said body portion having a plurality of lobes disposed in a helical orientation around said longitudinal axis wherein blood flowing through said lobes undergoes a rotation of at least about 360 degrees about said longitudinal axis, said lobes having a peripheral third diameter which is at least about four times said first predetermined diameter of said inlet.

5. The cannula tip of claim 4 wherein said body portion includes swirl inducing means downstream from said inlet for causing a rotation of a flow of said blood within said cannula tip around said longitudinal axis.

Assignees

• Univ Carnegie Mellon

Inventors

• Gopalakrishna Prahlad Menon
• Pekkan Kerem

Classifications

• A61M25/00 Primary

  Catheters; Hollow probes (dilators A61M29/00; {peritoneal catheters A61M1/285; tracheal tubes A61M16/04; for drainage A61M27/00; for uterus, vagina or rectum A61M31/00} ; for measuring or testing A61B; {materials for catheters A61L29/00}) · CPC title

• A61M2206/20

  having means for promoting or enhancing the flow, actively or passively · CPC title

• A61M2206/16

  Rotating swirling helical flow, e.g. by tangential inflows · CPC title

• A61M2025/0073

  Tip designed for influencing the flow or the flow velocity of the fluid, e.g. inserts for twisted or vortex flow · CPC title

• A61M1/3666

  Cardiac or cardiopulmonary bypass, e.g. heart-lung machines · CPC title