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Publication Number
US-12383708-B2
Publication Date
2025-08-12
Expiration Date
Abstract
This invention relates to a medical device. The device includes an elongate cannula which is insertable into a blood vessel and which is resiliently biased towards a closed condition in which it inhibits fluid flow through the cannula. The cannula is displaceable away from its closed position by the introduction of a displacement arrangement such as a device or instrument or a pressurised fluid and reverts to its closed condition when the displacement arrangement is removed from the cannula to inhibit the flow of blood therethrough. The invention further relates to a needle for use with the medical device, to a kit and to a method of accessing a blood vessel. In addition, it relates to a method of closing an incision in a blood vessel and to a closure member for use in the method.
Core Innovation
A medical device includes a cannula having a distal end portion that is insertable into a blood vessel, a proximal end, and a lumen extending through the cannula. The distal end portion comprises a closure portion formed of a resiliently deformable material that extends longitudinally inwardly from the distal end portion for at least part of a length of the cannula. The closure portion is resiliently biased towards a closed configuration in which the closure portion inhibits fluid flow through the cannula, at least from the distal end portion to the proximal end.
The closure portion is displaceable against the bias away from the closed configuration to an open configuration by introduction of a needle through the lumen of the cannula. When the needle is removed from the lumen, the closure portion reverts to the closed configuration, thereby inhibiting fluid flow again. The closure portion has an arc shape in transverse cross-section when in the closed configuration.
A kit comprises a cutting tipped needle for forming an arc shaped incision in a blood vessel and a cannula having a distal end insertable into the blood vessel, a proximal end, and a lumen extending through the cannula. The cannula includes the resiliently deformable closure portion that extends longitudinally inwardly from the distal end portion and is biased towards a closed configuration to inhibit fluid flow.
In the kit, the arc shaped closure portion is complementary in shape to the arc shaped incision formed by the cutting tipped needle to facilitate insertion of the distal end of the cannula into the blood vessel through the arc shaped incision. The cannula is mountable on, and longitudinally displaceable relative to, the cutting tipped needle. The closure portion has an arc shape in transverse cross-section when in the closed configuration.
Claims Coverage
The partial content includes two independent claims, each focused on a cannula with a resiliently biased, arc-shaped closure portion and, in the kit claim, on forming a complementary arc-shaped incision with a cutting tipped needle.
Arc-shaped resiliently biased closure cannula
A medical device with a cannula insertable into a blood vessel, where a distal end portion includes a longitudinally inwardly extending resiliently deformable closure portion biased to a closed configuration that inhibits fluid flow, displaceable to an open configuration by introduction of a needle through the cannula lumen and reverting to the closed configuration when the needle is removed, with the closure portion having an arc shape in transverse cross-section when closed.
Complementary arc incision and displaceable placement on cutting-tipped needle kit
A kit comprising a cutting tipped needle for forming an arc shaped incision in a blood vessel and a cannula with a distal end insertable into the blood vessel, including a resiliently biased arc-shaped closure portion displaceable to an open configuration by introduction of a placement needle through the cannula lumen and reverting to the closed configuration when the placement needle is removed, where the arc-shaped closure portion is complementary in shape to the arc shaped incision to facilitate insertion, and where the cannula is mountable on and longitudinally displaceable relative to the cutting tipped needle.
Across both independent claims, the main inventive subject matter is a cannula with a resiliently biased arc-shaped closure portion that is opened by a needle introduced through the cannula lumen and recloses when the needle is removed, with the kit further pairing this cannula to a cutting tipped needle that forms a complementary arc-shaped incision for facilitating insertion.
Stated Advantages
The closure portion inhibits fluid flow through the cannula in the closed configuration and reverts to inhibit fluid flow when the needle is removed.
Documented Applications
Dialysis-related vessel access using a cannula and needles described as connectable to a dialysis machine.
Venepuncture using an atraumatic needle connectable to a Vacutainer or other venepuncture system.
Blood vessel access using a syringe or a drip-IV-system.
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