Patent GB556907A successfully refreshed from Google Patents.
US20040102738A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure actuated flow control valve
Assignee: Nexus Medical LLC
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Filing: 2002-11-26
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Granted: —
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Expires: 2022-11-26
Abstract
Abstract 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.
Inventors
- 👤 W. Dikeman
- 👤 Thomas Solomon
- 👤 Kerry Spiker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:48
CPC Classifications
A; A61; A61M; A61M39/00; A61M39/22; A61M39/24; A61M2039/242; A61M2039/2426; A61M39/10; A61M39/1011
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
55 words
1 . A pressure actuated flow control valve, comprising: a. a flexible dome-shaped valve body having a fluid passageway defining a passageway axis; b. said body having a wall with a convex surface and an opposite concave surface; and c. a normally closed slit extending between said convex and concave surfaces and intersecting said axis.
Claim 2
Dependent Claim
55 words
1 . A pressure actuated flow control valve, comprising: a. a flexible dome-shaped valve body having a fluid passageway defining a passageway axis; b. said body having a wall with a convex surface and an opposite concave surface; and c. a normally closed slit extending between said convex and concave surfaces and intersecting said axis.
Claim 3
Dependent Claim
61 words
2 . The control valve as recited in claim 1 , wherein: a. said wall has a substantially hemispherical configuration and selected material characteristics; and b. said wall having such material characteristics and said wall and said slit being so dimensionally configured as to resist opening in response to a selected range of venous blood pressure applied to said convex surface.
Claim 4
Dependent Claim
24 words
3 . The control valve as recited in claim 2 , wherein: a. said wall has a thickness; and b. said thickness diminishes apically.
Claim 5
Dependent Claim
66 words
4 . The pressure actuated flow control valve recited in claim 1 , wherein: a. said slit opens toward said convex surface upon application of a predetermined first fluid pressure to said concave surface, enabling forward flow through said fluid passageway; and b. said slit closes to check flow through said fluid passageway at a pressure on said concave surface less than said first fluid pressure.
Claim 6
Dependent Claim
67 words
5 . The pressure actuated fluid control valve as recited in claim 1 , wherein: a. said slit opens toward said concave surface upon application of a predetermined second fluid pressure to said convex surface, enabling reverse flow through said fluid passageway; and b. said slit closes to check flow through said fluid passageway at a pressure on said convex surface less than said second fluid pressure.
Claim 7
Dependent Claim
130 words
6 . The pressure actuated flow control valve as recited in claim 1 , wherein: a. said slit opens toward said convex surface upon application of a predetermined first fluid pressure to said concave surface, enabling forward flow through said fluid passageway; b. said slit closes to check flow through said fluid passageway at a pressure on said concave surface less than said first fluid pressure; c. said slit opens toward said concave surface upon application of a predetermined second fluid pressure to said convex surface, enabling reverse flow through said fluid passageway; d. said slit closes to check flow through said fluid passageway at a pressure on said convex surface less than said second fluid pressure; and e. said second fluid pressure is greater than said first fluid pressure.
Claim 8
Dependent Claim
29 words
7 . The control valve as recited in claim 1 , wherein: a. said valve body includes an outwardly extending circumferential flange for engaging said valve within a housing.
Claim 9
Dependent Claim
19 words
8 . The control valve as recited in claim 1 , wherein: a. said slit is a circumferential slit.
Claim 10
Dependent Claim
61 words
9 . The control valve as recited in claim 1 , wherein: a. said slit is formed by slit surfaces on said convex surface bound by convex side edges having a first arc length and on said concave surface by concave side edges having a second arc length; and b. said first arc length is longer than said second arc length.
Claim 11
Dependent Claim
39 words
10 . The control valve as recited in claim 9 , wherein: a. said slit is formed by slit surfaces on said convex and concave surfaces bound by a pair of ends; and b. said ends subtend an angle.
Claim 12
Dependent Claim
55 words
11 . The control valve as recited in claim 1 , wherein: a. a rib projects in a direction of said axis from said concave surface in an orthogonal intersecting relationship to said slit such that relatively greater pressure on said convex surface is required to open said slit than pressure on said concave surface.
Claim 13
Dependent Claim
41 words
12 . The control valve as recited in claim 11 , wherein: a. said rib is of elongate construction having a center portion and a pair of ends; and b. said center portion has a greater axial depth than said ends.
Claim 14
Dependent Claim
73 words
13 . The control valve as recited in claim 11 , wherein: a. said rib further comprises a first leg and a second leg; b. said first rib leg projects in a direction of said axis from said concave surface in an orthogonal intersecting relationship to said slit; and c. said second rib leg projects in a direction of said axis from said concave surface in an intersecting relationship to said first rib.
Claim 15
Dependent Claim
133 words
14 . An outdwelling pressure actuated flow control valve assembly for a catheter, comprising: a. a housing having an inlet, an outlet, and a fluid passageway therebetween including a passageway axis; b. a valve body disposed within said fluid passageway and including a spherical dome-shaped wall having an outstanding circumferential flange engaged by said housing, the wall being flexible from a first position blocking flow through the fluid passageway to a second position enabling forward flow through the fluid passageway or to a third position enabling reverse flow through the fluid passageway; and c. said spherical dome-shaped wall has a convex surface and an opposite concave surface, and includes a normally closed slit extending therebetween and intersecting said axis, said slit being opened in said second and third positions to enable flow therethrough.
Claim 16
Dependent Claim
133 words
14 . An outdwelling pressure actuated flow control valve assembly for a catheter, comprising: a. a housing having an inlet, an outlet, and a fluid passageway therebetween including a passageway axis; b. a valve body disposed within said fluid passageway and including a spherical dome-shaped wall having an outstanding circumferential flange engaged by said housing, the wall being flexible from a first position blocking flow through the fluid passageway to a second position enabling forward flow through the fluid passageway or to a third position enabling reverse flow through the fluid passageway; and c. said spherical dome-shaped wall has a convex surface and an opposite concave surface, and includes a normally closed slit extending therebetween and intersecting said axis, said slit being opened in said second and third positions to enable flow therethrough.
Claim 17
Dependent Claim
31 words
15 . The pressure actuated flow control valve assembly as recited in claim 14 , wherein: a. a rib projects from said concave surface in orthogonally extending relationship to said slit.
Claim 18
Dependent Claim
77 words
16 . The pressure actuated flow control valve assembly as recited in claim 15 , wherein: a. said rib further comprises a first leg and a second leg; b. said first rib leg projects in a direction of said axis from said concave surface in an orthogonal intersecting relationship to said slit; and c. said second rib leg projects in a direction of said axis from said concave surface in an intersecting relationship to said first rib.
Claim 19
Dependent Claim
23 words
17 . The pressure actuated control valve assembly as recited in claim 14 , wherein: a. said wall has a substantially hemispherical configuration.
Claim 20
Dependent Claim
27 words
18 . The pressure actuated control valve assembly as recited in claim 17 , wherein: a. said wall has a thickness; and b. said thickness diminishes apically.
Claim 21
Dependent Claim
74 words
19 . The pressure actuated control valve assembly as recited in claim 14 , wherein said slit is formed by opposite slit surfaces, and wherein: a. each slit surface intersects said convex surface to form a convex arc having a first arc length; b. each slit surface intersects said concave surface to form a concave arc having a second arc length; and c. said first arc length is greater than said second arc length.
Claim 22
Dependent Claim
165 words
20 . An intravenous catheter assembly comprising: a. a catheter having a fluid passageway defining a passageway axis; b. a valve disposed within said fluid passageway and including a spherical dome-shaped wall having an outstanding circumferential flange engaging said catheter; c. said spherical dome-shaped wall presenting a convex surface and a concave surface and an axial, normally closed slit therebetween; d. said slit opens toward said convex surface upon application of a predetermined first fluid pressure to said concave surface enabling forward flow through said fluid passageway; e. said slit closes to check flow through said fluid passageway at a pressure on said concave surface less than said first fluid pressure. f. said slit opens toward said concave surface upon application of a predetermined second fluid pressure to said convex surface enabling reverse flow through said fluid passageway; and g. said slit closes to check flow through said fluid passageway upon application of a pressure to said convex surface less than said second fluid pressure.
Claim 23
Dependent Claim
165 words
20 . An intravenous catheter assembly comprising: a. a catheter having a fluid passageway defining a passageway axis; b. a valve disposed within said fluid passageway and including a spherical dome-shaped wall having an outstanding circumferential flange engaging said catheter; c. said spherical dome-shaped wall presenting a convex surface and a concave surface and an axial, normally closed slit therebetween; d. said slit opens toward said convex surface upon application of a predetermined first fluid pressure to said concave surface enabling forward flow through said fluid passageway; e. said slit closes to check flow through said fluid passageway at a pressure on said concave surface less than said first fluid pressure. f. said slit opens toward said concave surface upon application of a predetermined second fluid pressure to said convex surface enabling reverse flow through said fluid passageway; and g. said slit closes to check flow through said fluid passageway upon application of a pressure to said convex surface less than said second fluid pressure.
Claim 24
Dependent Claim
25 words
21 . The intravenous catheter assembly as recited in claim 20 , wherein: a. said second fluid pressure is greater than said first fluid pressure.
Claim 25
Dependent Claim
49 words
22 . The intravenous catheter assembly as recited in claim 20 , wherein: a. a rib projects from said concave surface in orthogonal intersecting relationship to said slit such that relatively greater pressure on said convex surface is required to open said slit than pressure on said concave surface.
Claim 26
Dependent Claim
26 words
23 . The intravenous catheter assembly as recited in claim 20 , wherein: a. said valve wall has a thickness; and b. said thickness diminishes apically.
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