Fluid Flow Control Device with Retractable Cannula

Abstract

A device having a housing; a cannula projecting forwardly from the housing; a connector useful for attaching the device to a fluid source or receptacle; a fluid flow path establishing fluid communication between the cannula and the connector; a retraction mechanism biasing the cannula away from its projecting position; and an actuator supported by the housing and configured to modify the fluid flow path so as to terminate fluid flow through the device, seal off the fluid flow path, and release the retraction mechanism to retract the cannula into the housing. The subject device is particularly preferred for use in the medical field, for example, as part of an infusion set or as a collection device for blood, or other fluids or flowable matter.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to a fluid flow control device and, in a preferred embodiment, to a medical device having a cannula, often a needle, that is insertable into a patient for use in infusing, collecting or extracting fluids. One aspect of the invention relates to a medical device having an actuator that is manipulated to modify a fluid flow path between the cannula and an external fluid source or receptacle following the infusion or extraction. Another aspect of the invention relates to a mechanism that functions as a clamp when attached to a fluid flow line. Another aspect of the invention relates to a mechanism that retracts the cannula inside the device to prevent accidental needlesticks following use and to prevent reuse of the contaminated cannula. Although the subject invention is particularly preferred for use in intravascular (“IV”) applications, it can also be used beneficially, for example, in epidural, int...

AI Technical Summary

Benefits of technology

[0007]The apparatus of the invention comprises a device that is particularly well suited for use in the medical field, but is not necessarily limited to medical use. According to one preferred embodiment of the invention, a medical device is disclosed that has a cannula and can be configured and used for fluid injection, infusion or extraction. Depending upon its configuration, the subject device can be used, for example: As part of an infusion set or as a collection device for venous or arterial blood; for other body fluids such as spinal fluid, cerebral fluid, amniotic fluid, and the like that are well known to healthcare workers; or for solid matter contained in suspensions or slurries such as, for example, medications, lipids or bone marrow. When the device is used for infusing fluids or medication, the fluid source can be, for example, an IV drip bag or a syringe. When the device is used for collecting blood, the fluid receptacle can be, for example, a blood collection bag, an evacuated tube or a syringe. When the device is attached to a fluid flow line, it can also be used as a clamp. Prior to retraction of the cannula, the device prevents fluid leakage into or out of the fluid flow path. The cannula is typically a needle having a front end that is beveled to facilitate insertion into tissue or into another medical device such as a port.

[0011]According to a preferred embodiment of the invention, a device is disclosed that preferably comprises a housing; a cannula projecting forwardly from the housing; a connector useful for attaching the device to a fluid source or receptacle; a fluid flow path establishing fluid communication between the cannula and the connector; a retraction mechanism biasing the cannula away from its projecting position; and an actuator supported by the housing and configured to modify the fluid flow path so as to terminate fluid flow through the device, seal off the fluid flow path, and release the retraction mechanism to retract the cannula into the housing. Laterally extending finger grips and / or stabilization wings with finger pads are desirably provided to facilitate manipulation of the device by a user, to resist rolling of the device on an underlying surface, and to provide surfaces that can be secured to a patient during use.

Problems solved by technology

The use of caps or covers that must be replaced over the cannula after withdrawal from a patient are not a satisfactory solution because they increase the risk for an accidental stick, or can become loose and fall off, thereby again exposing the contaminated cannula.

However, because an IV tube is connected directly to the retraction member, retraction of the cannula causes the IV tube to move rearwardly as well.

If the tube is not free to move rearwardly during retraction, the retraction member and the cannula may not be fully retracted.

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