IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0295807
(2011-11-14)
|
등록번호 |
US-8328769
(2012-12-11)
|
발명자
/ 주소 |
- Dikeman, W. Cary
- Solomon, Thomas J.
- Spiker, Kerry L.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
2 |
초록
▼
A pressure actuated flow control valve for an infusion catheter permits gravity flow of a liquid through the catheter and into a patient while resisting back flow of blood from the patient and into the catheter. The valve has a hemispherical body with an outstanding circumferential flange and a norm
A pressure actuated flow control valve for an infusion catheter permits gravity flow of a liquid through the catheter and into a patient while resisting back flow of blood from the patient and into the catheter. The valve has a hemispherical body with an outstanding circumferential flange and a normally closed, diametric slit. The slit is longer on the convex outer surface than on the concave inner surface. Dome thickness diminishes in the area adjacent the slit, reducing total apical deflection upon collapse of the slit toward the concave surface. An inner orthogonal rib biases the slit closed. Upon application of a predetermined pressure, the slit opens toward the concave surface to permit forward fluid flow. At lower pressures, the slit closes to check fluid flow. Greater reverse pressure is required to collapse the slit toward the concave surface to permit reverse fluid flow.
대표청구항
▼
1. A method of bi-directional fluid flow control in opposite infusion and aspiration directions through an intravascular device including a catheter, the method comprising the steps of: providing a pressure-actuated valve component for use in IV therapy, said valve component comprising: a housing in
1. A method of bi-directional fluid flow control in opposite infusion and aspiration directions through an intravascular device including a catheter, the method comprising the steps of: providing a pressure-actuated valve component for use in IV therapy, said valve component comprising: a housing including spaced apart intravenous fluid ports operable to be fluidly coupled to the catheter, with a fluid passageway extending between the ports to present a passageway axis, anda valve body being disposed within the fluid passageway and including a flexible arcuate-shaped wall that presents a convex surface and an opposite concave surface, with the convex surface facing the infusion direction and the concave surface facing the aspiration direction,said arcuate-shaped wall including a slit extending between the surfaces,said arcuate-shaped wall flexing to open the slit in response to an infusion fluid pressure differential across the wall, wherein the pressure against the concave surface is greater than the pressure against the convex surface,said arcuate-shaped wall flexing to open the slit in response to an aspiration fluid pressure differential across the wall, wherein the pressure against the convex surface is greater than the pressure against the concave surface,said valve body including a rib projecting from the concave surface,wherein when the valve is in a rest position, the slit is in a normally-closed, fluid flow blocking position;fluidly coupling the valve component with the catheter;introducing a forward fluid flow through the valve component to create said infusion fluid pressure differential across the arcuate-shaped wall, such that upon a pressure against the concave surface of the valve wall being approximately greater than a predetermined fluid cracking pressure of the valve wall, said slit flexing distally to open;terminating the forward fluid flow through the valve component, such that upon the pressure against the concave surface dropping below the predetermined fluid cracking pressure, the rib serves to bias the slit proximally into said normally-closed, flow-blocking position; andintroducing a rearward fluid flow through the valve component to create said aspiration fluid pressure differential across the arcuate-shaped wall, such that upon a pressure against the convex surface of the valve wall being approximately greater than a predetermined fluid collapsing pressure of the valve wall, said slit flexing proximally to open,wherein upon the slit flexing proximally to open, a limited portion of the arcuate-shaped wall flexes proximally. 2. The method of claim 1, said arcuate-shaped wall presenting a general apex and a lower edge generally opposite said apex, wherein said thickness of the arcuate-shaped wall increases as the lower edge is approached, such that said arcuate-shaped wall has a thickness that diminishes apically. 3. The method of claim 2, said slit intersecting said convex surface to form a convex arc having a convex arc length, said slit intersecting said concave surface to form a concave arc having a concave arc length, said convex arc length being greater than said concave arc length, with the slit presenting termination ends that are each at an oblique angle relative to the passageway axis, said slit intersecting the rib and extending along the arcuate-shaped wall radially outwardly from the rib relative to the axis so that the slit termination ends are spaced from the rib. 4. The method of claim 3, wherein the apically diminishing thickness of the arcuate-shaped wall and the convex arc length being greater than the concave arc length serve to bias the slit proximally upon termination of the forward fluid flow through the valve component. 5. The method of claim 4, wherein the apically diminishing thickness of the arcuate-shaped wall serves to prevent the entire arcuate-shaped wall inverting proximally upon rearward fluid flow through the valve component. 6. The method of claim 2, said slit having first and second ends each terminating at an end wall having a thickness and sidewalls extending circumferentially about said concave and convex surfaces of the wall of said valve, said sidewalls each having a circumferential and axial length,wherein when said slit is in said normally-closed position, said first and seconds ends are each non-parallel and non-perpendicular to the passageway axis and said sidewalls are in contact with each other at a majority of points along their respective circumferential and axial lengths,said slit intersecting the rib and extending along the arcuate-shaped wall radially outwardly from the rib relative to the passageway axis so that the slit termination ends are spaced from the rib. 7. The method of claim 6, wherein the apically diminishing thickness of the arcuate-shaped wall, the first and second ends of the slit being non-parallel and non-perpendicular, and the rib serve to provide a valve body permitting forward fluid flow by gravity from a fluid reservoir. 8. The method of claim 1, wherein said rib includes a pair of ends convergent with the concave surface of the arcuate-shaped wall. 9. The method of claim 8, wherein said rib has a depth that diminishes as the ends are approached. 10. The method of claim 9, wherein said rib further includes a pair of sides, and said depth of the rib diminishes as the sides are approached. 11. The method of claim 1, wherein the infusion fluid pressure differential is approximately the pressure provided by the force of gravity from an elevated fluid reservoir. 12. The method of claim 11, wherein the aspiration fluid pressure differential is greater than the infusion fluid pressure differential. 13. The method of claim 1, wherein upon the slit flexing proximally to open, generally all of the entire arcuate-shaped wall does not invert proximally. 14. The method of claim 13, wherein the rib serves to bias the slit distally into said normally-closed, flow-blocking position. 15. The method of claim 1, wherein upon said limited portion of the arcuate-shaped wall flexing proximally to open, said arcuate-shaped wall remains in a proximally-flexed position until a forward fluid flow is applied against the concave surface that is approximately greater than a pressure against the convex surface of the valve wall. 16. The method of claim 1, wherein said proximally-flexed position of the valve wall corresponds to said limited portion of the wall that flexes proximally upon the slit flexing proximally to open. 17. The method of claim 1, wherein said proximally-flexed position of the valve wall corresponds to said slit allowing at least some fluid to flow therethrough. 18. A method of bi-directional fluid flow control in opposite infusion and aspiration directions through an intravascular device including a catheter, the method comprising the steps of: providing a pressure-actuated valve component for use in IV therapy, said valve component comprising: a housing including spaced apart intravenous fluid ports operable to be fluidly coupled to the catheter, with a fluid passageway extending between the ports to present a passageway axis, anda valve body being disposed within the fluid passageway and including a flexible arcuate-shaped wall that presents a convex surface and an opposite concave surface, with the convex surface facing the infusion direction and the concave surface facing the aspiration direction,said arcuate-shaped wall including a slit extending between the surfaces,said arcuate-shaped wall flexing to open the slit in response to an infusion fluid pressure differential across the wall, wherein the pressure against the concave surface is greater than the pressure against the convex surface,said arcuate-shaped wall flexing to open the slit in response to an aspiration fluid pressure differential across the wall, wherein the pressure against the convex surface is greater than the pressure against the concave surface,wherein when the valve is in a rest position, the slit is in a normally-closed, fluid flow blocking position;fluidly coupling the valve component with the catheter;introducing a forward fluid flow through the valve component to create said infusion fluid pressure differential across the arcuate-shaped wall, such that upon a pressure against the concave surface of the valve wall being approximately greater than a predetermined fluid cracking pressure of the valve wall, said slit flexing distally to open;terminating the forward fluid flow through the valve component, such that upon the pressure against the concave surface dropping below the predetermined fluid cracking pressure, the slit flexes into said normally-closed, flow-blocking position; andintroducing a rearward fluid flow through the valve component to create said aspiration fluid pressure differential across the arcuate-shaped wall, such that upon a pressure against the convex surface of the valve wall being approximately greater than a predetermined fluid collapsing pressure of the valve wall, said slit flexing proximally to open,wherein upon the slit flexing proximally to open, a limited portion of the arcuate-shaped wall flexes proximally and remains in a proximally-flexed position until a forward fluid flow is applied against the concave surface that is approximately greater than a pressure against the convex surface of the valve wall. 19. The method of claim 18, said arcuate-shaped wall presenting a general apex and a lower edge generally opposite said apex, wherein said thickness of the arcuate-shaped wall increases as the lower edge is approached, such that said arcuate-shaped wall has a thickness that diminishes apically. 20. The method of claim 19, the valve body of the valve component further including a rib projecting from the concave surface. 21. The method of claim 20, said slit having first and second ends each terminating at an end wall having a thickness and sidewalls extending circumferentially about said concave and convex surfaces of the wall of said valve, said sidewalls each having a circumferential and axial length,wherein when said slit is in said normally-closed position, said first and seconds ends are each non-parallel and non-perpendicular to the passageway axis and said sidewalls are in contact with each other at a majority of points along their respective circumferential and axial lengths,said slit intersecting the rib and extending along the arcuate-shaped wall radially outwardly from the rib relative to the passageway axis so that the slit termination ends are spaced from the rib.
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