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A device for dispensing fluid to a patient and indicating a fluid flow condition. The device includes a reservoir configured to provide a source of fluid under pressure. A continuous flow path in fluid communication with the source of fluid provides a continuous and substantially constant flow rate

A device for dispensing fluid to a patient and indicating a fluid flow condition. The device includes a reservoir configured to provide a source of fluid under pressure. A continuous flow path in fluid communication with the source of fluid provides a continuous and substantially constant flow rate of fluid from the source to a patient. The device further includes at least one pre-biased indicator in fluid communication with the continuous flow path. The pre-biased indicator is configured to provide a discrete visual signal that the pressure of the fluid in the continuous flow path is different from a predetermined level of pressure, thereby indicating a fluid flow condition.

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1. A device for dispensing fluid to a patient and indicating a flow condition of the fluid through the device, the device comprising: a fluid reservoir configured to provide a source of fluid under pressure;a continuous flow path from the source providing a continuous and substantially constant flow

1. A device for dispensing fluid to a patient and indicating a flow condition of the fluid through the device, the device comprising: a fluid reservoir configured to provide a source of fluid under pressure;a continuous flow path from the source providing a continuous and substantially constant flow rate of the fluid under pressure, the continuous flow path in fluid communication with the source of fluid and a catheter for delivery of the fluid to the patient;a flow regulator included in the continuous flow path, the flow regulator setting the flow rate of the fluid through the continuous flow path from the source of fluid to the patient; andat least one pre-biased indicator in fluid communication with the continuous flow path, the at least one pre-biased indicator configured to provide a discrete visual signal that the pressure of the fluid in the continuous flow path is different from a predetermined level of pressure, thereby indicating a fluid flow condition,wherein the at least one pre-biased indicator comprises: a housing having a first end, a second end, one or more walls defining an interior channel, and an axial dimension, the first end of the housing being in fluid communication with the continuous flow path, and at least a portion of the housing being transparent or translucent;a flexible sleeve positioned within the interior channel of the housing, the flexible sleeve comprising: a first surface, an opposed second surface, a first end located within the interior channel of the housing near the first end of the housing and in fluid communication with the continuous flow path, a second end sealingly engaged with the housing, and a flexible, generally annular portion joining the first end and second end of the sleeve, the annular portion defining a rolling annular fold intermediate the first end and the second end such that at least a portion of the first surface of the flexible sleeve is generally adjacent the one or more housing walls and at least a portion of the second surface of the flexible sleeve defines a sleeve cavity; anda biasing element located at least partially within the sleeve cavity and between the first end of the housing and the second end of the housing, the biasing element being configured to deform at a predetermined pressure so the first end of the flexible sleeve moves from a first axial position to at least a second axial position to provide a discrete visual signal that the pressure of a fluid in the continuous flow path is different from the redetermined level of pressure,wherein the movement of the flexible sleeve in an axial direction causes a portion of the second surface of the flexible sleeve to evert at the rolling annular fold so that it becomes directly adjacent the one or more housing walls. 2. The device of claim 1, wherein the flexible sleeve located within the housing at the first axial position provides a first discrete visual signal, the first discrete visual signal indicating that the pressure of the fluid in the continuous flow path is less than the predetermined level of pressure. 3. The device of claim 1, wherein the flexible sleeve located within the housing at the second axial position provides a second discrete visual signal, the second discrete visual signal indicating that the pressure of the fluid in the continuous flow path is greater than the predetermined level of pressure. 4. The device of claim 1, wherein the flexible sleeve is visible through at least a portion of the housing while the flexible sleeve is in its first position. 5. The device of claim 1, wherein the flexible sleeve is visible through at least a portion of the housing while the flexible sleeve is in its second position. 6. The device of claim 1, wherein the flow regulator is adjustable to set the flow rate of the fluid within a range of from about 1 to about 14 cubic centimeters of fluid per hour. 7. The device of claim 1, wherein the flow regulator is a flow regulating orifice. 8. The device of claim 1, wherein the at least one pre-biased indicator is located between the flow regulator and the source of fluid. 9. The device of claim 8, wherein the at least one pre-biased indicator provides a first discrete visual signal that the pressure of the fluid in the continuous flow path is less than the predetermined level of pressure thereby indicating a flow state that is less than a continuous and substantially constant flow rate of fluid. 10. The device of claim 1, wherein the at least one pre-biased indicator is located in a direction downstream of the flow regulator. 11. The device of claim 10, wherein the at least one pre-biased indicator provides a second discrete visual signal that the pressure of the fluid in the continuous flow path is greater than the predetermined level of pressure thereby indicating a flow state that is less than a continuous and substantially constant flow rate of fluid. 12. An indicator assembly for indicating a fluid flow state in a medical device for dispensing a fluid under pressure to a patient through a continuous flow path at a continuous and substantially constant flow rate of fluid, the indicator assembly comprising: a flow regulator included in the continuous flow path, the flow regulator setting the flow rate of the fluid through the continuous flow path;a pre-biased indicator that provides a first discrete visual signal when the pressure of the fluid in the flow path is at a predetermined pressure and a second discrete visual signal when the pressure of the fluid in the flow path is no longer at a predetermined pressure, the pre-biased indicator being in fluid communication with the continuous flow path;whereby the second discrete visual signal provides warning that indicates a flow state that is less than a continuous and substantially constant flow rate of fluid; andwherein the pre-biased indicator comprises: a housing having a first end, a second end, one or more walls defining an interior channel, and an axial dimension, the first end of the housing being in fluid communication with the continuous flow path, and at least a portion of the housing being transparent or translucent;a flexible sleeve positioned within the interior channel of the housing, the flexible sleeve comprising: a first surface, an opposed second surface, a first end located within the interior channel of the housing near the first end of the housing and in fluid communication with the continuous flow path, a second end sealing engaged with the housing, and a flexible, generally annular portion joining the first end and second end of the sleeve, the annular portion defining a rolling annular fold intermediate the first end and the second end such that at least a portion of the first surface of the flexible sleeve is generally adjacent the one or more housing walls and at least a portion of the second surface of the flexible sleeve defines a sleeve cavity; anda biasing element located at least partially within the sleeve cavity and between the first end of the housing and the second end of the housing, the biasing element being configured to deform at a predetermined pressure so the first end of the flexible sleeve moves from a first axial position to at least a second axial position to provide a discrete visual signal that the pressure of a fluid in the continuous flow path is different from the redetermined level of pressure,wherein the movement of the flexible sleeve in an axial direction causes a portion of the second surface of the flexible sleeve to evert at the rolling annular fold so that it becomes directly adjacent the one or more housing walls. 13. The indicator assembly of claim 12, wherein the pre-biased indicator provides no signal of other pressure states between the first discrete visual signal and the second discrete visual signal. 14. A device for dispensing fluid to a patient and indicating a flow condition of the fluid through the device, the device comprising: a fluid reservoir configured to provide a source of fluid under pressure;a continuous flow path from the source providing a continuous and substantially constant flow rate of the fluid under pressure, the continuous flow path in fluid communication with the source of fluid and a catheter for delivery of the fluid to the patient;a flow regulator included in the continuous flow path, the flow regulator setting the flow rate of the fluid through the continuous flow path from the source of fluid to the patient; andat least one pre-biased indicator in fluid communication with the continuous flow path, the at least one pre-biased indicator configured to provide a discrete visual signal that the pressure of the fluid in the continuous flow path is different from a predetermined level of pressure, thereby indicating a fluid flow condition, the at least one pre-biased indicator comprising a housing having one or more walls defining an interior channel, the at least one pre-biased indicator further comprising a flexible sleeve, the flexible sleeve including a first surface,an opposed second surface,a first end in fluid communication with the continuous flow path,a second end sealingly engaged with the housing, anda flexible, generally annular portion joining the first end and second end of the sleeve, the annular portion defining a rolling annular fold intermediate the first end and the second end such that at least a portion of the first surface of the flexible sleeve is generally adjacent the one or more housing walls and at least a portion of the second surface of the flexible sleeve defines a sleeve cavity. 15. The device of claim 14, wherein the at least one pre-biased indicator is located between the flow regulator and the source of fluid such that the pre-biased indicator provides a discrete visual signal when the pressure of the fluid in the continuous flow path is less than the predetermined level of pressure thereby indicating a flow state that is less than a continuous and substantially constant flow rate of fluid. 16. The device of claim 14, wherein the at least one pre-biased indicator is located in a direction downstream of the flow regulator such that the pre-biased indicator provides a discrete visual signal when the pressure of the fluid in the continuous flow path is greater than the predetermined level of pressure thereby indicating a flow state that is greater than a continuous and substantially constant flow rate of fluid. 17. The device of claim 14, wherein the at least one pre-biased indicator further comprises a biasing element located at least partially within the sleeve cavity and between the first end of the housing and the second end of the housing, the biasing element being configured to deform at a predetermined pressure so the first end of the flexible sleeve moves from a first axial position to at least a second axial position to provide a discrete visual signal that the pressure of a fluid in the continuous flow path is different from the predetermined level of pressure. 18. The device of claim 17, wherein the movement of the flexible sleeve in an axial direction causes a portion of the second surface of the flexible sleeve to evert at the rolling annular fold so that it becomes directly adjacent the one or more housing walls. 19. The device of claim 14, wherein the at least one pre-biased indicator provides a first discrete visual signal when the pressure of the fluid in the flow path is at a predetermined pressure and a second discrete visual signal when the pressure of the fluid in the flow path is no longer at the predetermined pressure. 20. The device of claim 19, wherein the at least one pre-biased indicator provides no signal of other pressure states between the first discrete visual signal and the second discrete visual signal.