Catheter assembly with seal member
A catheter assembly includes a catheter hub defining an interior cavity and a catheter tube extending distally thereof. A rigid actuator is positioned to extend proximally in the interior cavity and support a seal member positioned thereon in the interior cavity. The seal member includes a central membrane, a distal portion, and a proximal portion. An hourglass shaped actuator cavity is formed in the distal portion and receives a barbed end of the actuator. The outer surface of the seal member is in partial circumferential engagement with the catheter hub to define an air path that allows fluid communication between areas of the interior cavity distal and proximal of the seal member. The seal member may be configured for multi-use and include a biasing member that moves the seal member to force the membrane back over the actuator to close the membrane.
1. A catheter assembly comprising:
a catheter hub having a proximal end and a distal end defining an interior cavity therebetween;
an actuator disposed in the interior cavity of the catheter hub, extending proximally into the interior cavity of the catheter hub from the catheter hub distal end; and
a seal member disposed in the interior cavity of the catheter hub, the seal member including a membrane, a cylindrical proximal portion including a cylindrical bore extending proximally from the membrane to an opening at a proximal end of the proximal portion, and a distal portion extending distally from the membrane having a distal end separated from the distal end of the catheter hub by a given space, the distal portion having an actuator cavity between the membrane and a sealing outlet bore at the distal end of the distal portion,
wherein the actuator extends through the sealing outlet bore into the actuator cavity, and
wherein the membrane comprises a slit.
2. The catheter assembly of claim 1 , wherein the slit has a y-shaped configuration.
3. The catheter assembly of claim 1 , wherein a length of the slit is less than a diameter of the membrane.
4. The catheter assembly of claim 3 , wherein an end of the slit does not penetrate into an inner surface of the seal member.
5. The catheter assembly of claim 1 , wherein the slit cooperates with an end of a needle shaft disposed within the actuator to form a liquid-proof seal.
6. The catheter assembly of claim 1 , wherein the proximal portion is configured to present an impact surface to a free end of a tapered connector, such that insertion of the tapered connector into the catheter hub interior cavity impacts the impact surface causing the seal member to slide axially along the actuator.
7. The catheter assembly of claim 1 , wherein the seal member has an outer surface, and wherein at least one portion of the outer surface of the seal member is in circumferential engagement with an inner wall of the catheter hub interior cavity to separate a distal portion of the interior cavity and a proximal portion of the interior cavity of the catheter hub from each other.
8. The catheter assembly of claim 1 , wherein the distal portion is adapted to be compressed to generate a restoring force when a distal force is applied against the proximal end of the proximal portion to move the seal member distally from a ready to use position, the restoring force at the distal portion biasing the seal member proximally to the ready to use position when the distal force is removed from the proximal end of the proximal portion.
9. A catheter assembly comprising:
a catheter hub having a proximal end and a distal end defining an interior cavity therebetween; and
a seal member disposed within the interior cavity, the seal member including a membrane, a cylindrical proximal portion including a cylindrical bore extending proximally from the membrane to an opening at a proximal end of the proximal portion, and a distal portion extending distally from the membrane having a distal end separated from the distal end of the catheter hub by a given space, the distal portion comprising an actuator cavity between the membrane and a sealing outlet bore at the distal end of the distal portion,
wherein the membrane comprises a slit.
10. The catheter assembly of claim 9 , wherein the slit has a y-shaped configuration.
11. The catheter assembly of claim 9 , wherein a length of the slit is less than a diameter of the membrane.
12. The catheter assembly of claim 9 , wherein an end of the slit does not penetrate into an inner surface of the seal member.
13. The catheter assembly of claim 9 , wherein the slit cooperates with an end of a needle shaft disposed within the catheter hub and through the seal member to form a liquid-proof seal.
14. The catheter assembly of claim 9 , further comprising an actuator having a cylindrical shaft with a proximal free end and a distal end and an eyelet portion at the distal end, the proximal free end positioned within the actuator cavity.
15. The catheter assembly of claim 14 , the cylindrical shaft of the actuator having a first cross dimension and the eyelet portion having a second cross dimension being closely sized to and greater than a diameter of a needle cannula, the second cross dimension configured to secure the eyelet portion to the distal end of the catheter hub.
16. The catheter assembly of claim 15 , wherein the proximal free end comprises a third cross dimension larger than the first cross dimension and the second cross dimension and smaller than an inner diameter of an inner wall of the catheter hub.
17. The catheter assembly of claim 14 , further comprising a barb at the proximal free end of the cylindrical shaft, the barb including an enlarged flange folding back over a portion of the cylindrical shaft and diverging in a distal direction to define a frustoconical outer surface being radially outward of the cylindrical shaft.
18. The catheter assembly of claim 14 , wherein the proximal portion is configured to present an impact surface to a free end of a tapered connector, such that insertion of the tapered connector into the catheter hub interior cavity impacts the impact surface causing the seal member to slide axially along the actuator.
19. The catheter assembly of claim 9 , wherein the seal member has an outer surface, and wherein at least one portion of the outer surface of the seal member is in circumferential engagement with an inner wall of the catheter hub interior cavity to separate a distal portion of the interior cavity and a proximal portion of the interior cavity of the catheter hub from each other.
20. The catheter assembly of claim 9 , wherein the distal portion is adapted to be compressed to generate a restoring force when a distal force is applied against the proximal end of the proximal portion to move the seal member distally from a ready to use position, the restoring force at the distal portion biasing the seal member proximally to the ready to use position when the distal force is removed from the proximal end of the proximal portion.