Injection access port with chamfered top hat septum design
View Patent ↗An access port comprises a housing with a first opening and a self sealing septum sealing the first opening, the septum including an attachment portion for securing the septum to the housing, the attachment portion including a chamfer which, when the septum is mounted within the housing is subject to a force oriented substantially perpendicularly with respect to a plane of the outer surface, the chamfered portion redirecting a portion of the force to compress the outer surface. A septum for an access port comprises an attachment portion for abutting a septum seat of the access port and an operative surface permitting penetration by a needle and resealing itself after removal of the needle in combination with a chamfered portion providing a transition between the attachment portion and the operative surface, the chamfered portion re-directing a component of a force applied to the chamfered portion to compress the operative surface.
1. An access port comprising:
a housing with a first and second openings formed therein; and
a septum mounted within the housing sealing the first opening, the septum including:
a solid, disk-shaped operative portion engaging the first opening and self-sealing after penetration by a needle; and
an annular attachment portion for securing the septum to the housing, the attachment portion being coupled to the operative surface by a chamfered portion which, when the septum is mounted within the housing, is not coplanar with the annular surface and is subject to a force oriented substantially perpendicularly with respect to the annular surface, the chamfered portion redirecting a portion of the force to compress the operative surface in a direction substantially parallel to the annular surface,
wherein the chamfered portion comprises an elastomeric material extending continuously, without interruption, along a cross-sectional plane, wherein the chamfer is not perpendicular to the operative surface and the annular surface, and wherein the second opening is adapted to connect to a catheter and is substantially perpendicular to the first opening.
2. The access port according to claim 1 , wherein a base of the housing forms a septum seat and a cover of the housing secures the septum on the seat so that the attachment portion is compressed therebetween.
3. The access port according to claim 1 , wherein the chamfer comprises at least one surface that forms an angle of between 0° and 90° relative to the operative surface and the annular surface.
4. The access port according to claim 3 , wherein the at least one angled surface forms a 45 degree angle to the operative surface.
5. The access port according to claim 1 , wherein the chamfer comprises a stepped surface extending away from the operative surface.
6. The access port according to claim 1 , wherein the chamfer comprises a curved fillet extending away from the operative surface.
7. The access port according to claim 6 , wherein the curved fillet has a substantially constant radius of curvature.
8. The access port according to claim 1 , wherein the annular surface abuts a septum seat of the housing.
9. The access port according to claim 1 , wherein the operative surface comprises a substantially planar membrane overlying the first opening.
10. The access port according to claim 1 , wherein the operative surface comprises a membrane which, when unconstrained has a dimension greater than a corresponding dimension of the first opening so that, when placed within the first opening the operative surface is compressed thereby.
11. A septum for an access port, comprising:
an annular attachment portion adapted to abut a septum seat of the access port, the attachment portion including an annular surface;
a solid, disk-shaped operative portion adapted to permit penetration by a needle and resealing itself after removal of the needle, a periphery of the operative surface being radially within a periphery of the annular surface; and
a chamfered portion providing a transition between the annular attachment portion and the operative surface, wherein the chamfered portion comprises an elastomeric material extending continuously, without interruption, along a cross-sectional plane, wherein the chamfered portion is not coplanar with the annular surface and is not perpendicular to the operative surface and the annular surface, and wherein the septum is a unitary body.
12. The septum according to claim 11 , wherein the operative surface is sized to substantially overlie an opening of the access port.
13. The septum according to claim 11 , wherein the chamfer portion is adapted to apply to the operative surface a radially compressive component of a force applied substantially perpendicularly thereto by assembly of the access port.
14. The septum according to claim 11 , wherein the chamfered portion comprises a fillet joining the operative surface to the attachment portion.
15. The septum according to claim 11 , wherein the chamfered portion comprises an angled surface that forms an angle of between 0° and 90° joining the operative surface to the attachment portion.
16. The septum according to claim 11 , wherein the chamfered portion comprises a stepped surface joining the operative surface to the attachment portion.
17. The septum according to claim 11 , wherein the operative surface is formed of a flexible polymeric material.