Constant rate fluid delivery device with selectable flow rate and titratable bolus button
First Claim
1. A device for delivering fluid at a constant selectable flow rate comprising:
- a housing;
a reservoir in said housing for containing a supply of said fluid and for delivering said fluid under pressure;
a primary restrictor channel and a rate selector channel each having a proximal end and a distal end, said proximal ends being in fluid communication with said reservoir; and
a delivery cannula in fluid communication with said distal end of said primary restrictor and selector channels for delivering said fluid;
said primary restrictor channel comprising a plurality of sections;
said rate selector channel having a plurality of nodes, each node being in fluid communication with a corresponding section of said primary restrictor channel, and capable of being closed, such that when a particular node is closed, fluid flowing from said reservoir toward said cannula may not pass through the node but rather must pass through the corresponding section of said primary restrictor channel;
wherein said nodes are defined by indentations in said housing, said device further having a flow rate selection device movably connected to said housing, said flexible membrane disposed between said housing and said flow rate selection device, said flow rate selection device further having a plurality of detents adapted to match said indentations such that said detents may be moved into alignment with any number of said indentations causing the corresponding nodes to be closed.
1 Assignment
0 Petitions
Accused Products
Abstract
A wearable, self-contained drug infusion device is disclosed that is capable of achieving the precise flow rate control needed for dose-critical drugs such as insulin. In preferred embodiments of the device, at least two flow channels are utilized in conjunction with a series of valves for providing a user with selectable, constant flow rate control. The device can be made with small dimensions so that it can be worn by the user with a minimum of discomfort and inconvenience. In addition, the simple mechanical nature of the device provides the user with close control over the flow rate, which is required for safe and effective delivery of insulin and other drugs. Also, the absence of electronic components allows the device to be manufactured inexpensively. The device is provided with a first channel that is long and narrow, functioning as a flow restrictor. The first channel is preferably provided in a serpentine pattern. A second channel is also provided that has a larger cross section so that flow is not restricted. A series of valves are used to force the flow of fluid through a selectable portion of the serpentine portion of the first channel before entering the remainder of the second channel and flowing to the delivery cannula. In one embodiment of the device, a needle port is provided in fluid communication with the delivery cannula for delivering bolus injections. In another embodiment, a bolus button is provided for delivering bolus injections. A flow restrictor is preferably included in the bolus button to limit the rate at which the bolus button refills.
512 Citations
7 Claims
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1. A device for delivering fluid at a constant selectable flow rate comprising:
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a housing;
a reservoir in said housing for containing a supply of said fluid and for delivering said fluid under pressure;
a primary restrictor channel and a rate selector channel each having a proximal end and a distal end, said proximal ends being in fluid communication with said reservoir; and
a delivery cannula in fluid communication with said distal end of said primary restrictor and selector channels for delivering said fluid;
said primary restrictor channel comprising a plurality of sections;
said rate selector channel having a plurality of nodes, each node being in fluid communication with a corresponding section of said primary restrictor channel, and capable of being closed, such that when a particular node is closed, fluid flowing from said reservoir toward said cannula may not pass through the node but rather must pass through the corresponding section of said primary restrictor channel;
wherein said nodes are defined by indentations in said housing, said device further having a flow rate selection device movably connected to said housing, said flexible membrane disposed between said housing and said flow rate selection device, said flow rate selection device further having a plurality of detents adapted to match said indentations such that said detents may be moved into alignment with any number of said indentations causing the corresponding nodes to be closed.
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2. A device for delivering fluid at a constant flow rate comprising:
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a housing;
a reservoir in said housing for containing a supply of said fluid and for delivering said fluid under pressure;
a primary restrictor channel having a proximal end and a distal end, said proximal end being in fluid communication with said reservoir;
a delivery cannula in fluid communication with said distal end of said primary restrictor channel for delivering said fluid;
a bolus restrictor channel having a proximal end in fluid communication with said reservoir, and a distal end in fluid communication with a bolus button; and
a bolus exit channel having a proximal end in fluid communication with said bolus button, a distal end in fluid communication with said delivery cannula, and a spring check valve adapted to prevent said fluid from flowing toward said bolus button and further adapted to allow said fluid to flow toward said delivery cannula only if a minimum pressure is exceeded;
wherein said bolus button is adapted to have a maximum volume, and is further adapted to be collapsed, causing fluid to flow through said spring check valve to said delivery cannula;
wherein said bolus restrictor channel further comprises a flow restrictor adapted to restrict the flow of fluid through said bolus restrictor channel;
wherein said first flow channel comprises a plurality of sections, and wherein said device further comprises a rate selector channel having a proximal end in fluid communication with said reservoir and a distal end in fluid communication with said delivery cannula;
said rate selector channel having a greater cross sectional area than said first flow channel, and further having a plurality of nodes, each node being in fluid communication with a corresponding section of said primary restrictor channel, and capable of being closed, such that when a particular node is closed, fluid flowing from said reservoir toward said needle may not pass through the node but rather must pass through the corresponding section of said primary restrictor channel. - View Dependent Claims (3)
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4. A device for delivering fluid at a constant selectable flow rate comprising:
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a housing;
a reservoir in said housing for containing a supply of said fluid and for delivering said fluid under pressure;
a primary restrictor channel and a rate selector channel each having a proximal end and a distal end, said proximal ends being in fluid communication with said reservoir;
a delivery cannula in fluid communication with said distal end of said primary restrictor and selector channels for delivering said fluid;
a bolus restrictor channel having a proximal end in fluid communication with said reservoir, and a distal end in fluid communication with a bolus button; and
a bolus exit channel having a proximal end in fluid communication with said bolus button, a distal end in fluid communication with said delivery cannula, and a spring check valve adapted to prevent said fluid from flowing toward said bolus button and further adapted to allow said fluid to flow toward said delivery cannula only if a minimum pressure is exceeded;
said primary restrictor channel comprising a plurality of sections;
said rate selector channel having a plurality of nodes, each node being in fluid communication with a corresponding section of said primary restrictor channel, and capable of being closed, such that when a particular node is closed, fluid flowing from said reservoir toward said cannula may not pass through the node but rather must pass through the corresponding section of said primary restrictor channel. - View Dependent Claims (5, 6, 7)
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Specification