High resistance implanted bronchial isolation devices and methods
Disclosed are methods and devices for regulating fluid flow to and from a region of a patient's lung, such as to achieve a desired fluid flow dynamic to a lung region during respiration and/or to induce collapse in one or more lung regions. Pursuant to an exemplary procedure, an identified region of the lung is targeted for treatment. The targeted lung region is then bronchially isolated to regulate airflow into and/or out of the targeted lung region through one or more bronchial passageways that feed air to the targeted lung region. An exemplary flow control device is configured to block fluid flow in the inspiratory direction and the expiratory direction at normal breathing pressures and allow fluid flow in the expiratory direction at higher than normal breathing pressures.
1. A flow control device suitable for implanting in a bronchial passageway, comprising:
a valve configured to transition between a closed configuration that blocks air flow in the inspiratory direction and an open configuration that permits air flow in an expiratory direction;
wherein the valve is configured to be in the closed configuration when exposed to no air flow, air flow in the inspiratory direction, and air flow in the expiratory direction at normal breathing pressures, and wherein the valve is configured to be in the open configuration when exposed to air flow in the expiratory direction at coughing pressures;
wherein the valve is configured to have a cracking pressure in the range of 12-24 inches H 2 O.
2. The flow control device of claim 1 , wherein the valve comprises a first lip, a second lip, and two opposed inclined flaps leading to the first and second lips;
wherein the two opposed inclined flaps are configured to be oriented at an angle with respect to one another in the closed configuration and the first and second lips are configured to be parallel with respect to one another and a longitudinal axis of the valve in the closed configuration.
3. The flow control device of claim 2 , wherein the first and second lips are configured to extend longitudinally in contact with one another beyond the two inclined flaps while in the closed configuration.
4. The flow control device of claim 3 , wherein a length of the parallel and contacted first and second lips extending longitudinally beyond the two inclined flaps and the angle of the inclined flaps with respect to one another are configured such that the valve is in the closed configuration when exposed to no air flow, air flow in the inspiratory direction, and air flow in the expiratory direction at normal breathing pressures, and such that the valve is in the open configuration when exposed to air flow in the expiratory direction in the range of 12-24 inches H 2 O.
5. The flow control device of claim 3 , wherein the length of the parallel and contacted first and second lips extending longitudinally beyond the two inclined flaps is at least 30% as long as a length of the inclined flaps.
6. The flow control device of claim 2 , wherein the two inclined flaps are oriented at an angle relative to a longitudinal axis of the valve while in the closed configuration.
7. The flow control device of claim 2 , wherein the angle is in the range of 70 to 110 degrees.
8. The flow control device of claim 1 , wherein the valve is configured to be oriented at an angle with respect to a direction of air flow through the bronchial passageway.
9. A flow control device suitable for implanting in a bronchial passageway, comprising:
a valve configured to transition between a closed configuration that blocks air flow in the inspiratory direction and an open configuration that permits air flow in an expiratory direction;
wherein the valve is configured to be in the closed configuration when exposed to no air flow, air flow in the inspiratory direction, and air flow in the expiratory direction at normal breathing pressures, and wherein the valve is configured to be in the open configuration when exposed to air flow in the expiratory direction at coughing pressures;
wherein the valve is configured to have a cracking pressure in the range of 121-160 inches H 2 O.
10. The flow control device of claim 9 , wherein the valve comprises a first lip, a second lip, and two opposed inclined flaps leading to the first and second lips;
wherein the two opposed inclined flaps are configured to be oriented at an angle with respect to one another in the closed configuration and the first and second lips are configured to be parallel with respect to one another and a longitudinal axis of the valve in the closed configuration.
11. The flow control device of claim 10 , wherein the first and second lips are configured to extend longitudinally in contact with one another beyond the two inclined flaps while in the closed configuration.
12. The flow control device of claim 11 , wherein a length of the parallel and contacted first and second lips extending longitudinally beyond the two inclined flaps and the angle of the inclined flaps with respect to one another are configured such that the valve is in the closed configuration when exposed to no air flow, air flow in the inspiratory direction, and air flow in the expiratory direction at normal breathing pressures, and such that the valve is in the open configuration when exposed to air flow in the expiratory direction in the range of 121-160 inches H 2 O.
13. The flow control device of claim 11 , wherein the length of the parallel and contacted first and second lips extending longitudinally beyond the two inclined flaps is at least 30% as long as a length of the inclined flaps.
14. The flow control device of claim 10 , wherein the two inclined flaps are oriented at an angle relative to a longitudinal axis of the valve while in the closed configuration.
15. The flow control device of claim 9 , wherein the valve is configured to be oriented at an angle with respect to a direction of air flow through the bronchial passageway.