Medical treatment system and methods using a plurality of fluid lines
A medical treatment system, such as peritoneal dialysis system, may include control and other features to enhance patient comfort and ease of use. For example, a peritoneal dialysis system may include patient line state detector for detecting whether a patient line is primed before it is to be connected to the patient. The patient line state detector can also the ability to detect whether a patient line has been properly mounted for priming. Both patient line presence/absence and fill state can be determined using an optical system, e.g., one that employs a single optical sensor.
1. A fluid handling cassette configured to reversibly engage with a pump control unit for operating the cassette, comprising:
a body having an engagement side comprising a pump chamber formed as a depression in the engagement side of the body, a fluid inlet end and a fluid outlet end, the fluid inlet and outlet ends comprising one or more ports on the body in fluid communication with the pump chamber via one or more flowpaths in the body; and
a port on the fluid inlet end comprising a spike, the spike configured to mate with a connector of a fluid line when in use, or to mate with a spike cap when not in use;
the spike comprising a proximal base adjacent the fluid inlet end of the cassette, and a distal end configured to penetrate the fluid line connector;
the base of the spike comprising one or more elongate posts extending in a longitudinal direction distally along the base of the spike from the fluid inlet end of the cassette body, the posts arranged to make frictional contact with an internal surface of a spike cap installed on the spike;
the internal surface of the spike cap comprising a circumferential raised rib that contacts the spike distal to a distal end of the one or more elongate posts, the circumferential raised rib configured to form a seal around the spike;
wherein a portion of the spike distal to the circumferential raised rib of the installed spike cap is in fluid communication with the one or more flowpaths in the body of the cassette, and wherein a portion of the spike proximal to the circumferential raised rib of the installed spike cap is in fluid communication with an outer surface of the body of the cassette.
2. The fluid handling cassette of claim 1 , wherein the installed spike cap comprises one or more partially circumferential raised ribs formed around the internal surface of the spike cap at a location that mates with the spike distal to the proximal base of the spike.
3. A fluid handling cassette configured to reversibly engage with a pump control unit for operating the cassette, comprising:
a body having an engagement side comprising a pump chamber formed as a depression in the engagement side of the body, a fluid inlet end and a fluid outlet end, the fluid inlet and outlet ends comprising one or more ports on the body in fluid communication with the pump chamber via one or more flowpaths in the body; and
a port on the fluid inlet end comprising a spike, the spike configured to mate with a connector of a fluid line when in use, or to mate with a spike cap when not in use;
the spike comprising a proximal base adjacent the fluid inlet end of the cassette, and a distal end configured to penetrate the fluid line connector;
the base of the spike comprising one or more partially circumferential ribs formed around the spike, each partially circumferential rib having a gap in which the outer surface of the spike fails to contact an internal surface of an installed spike cap;
the internal surface of the spike cap comprising a circumferential raised rib that contacts the spike distal to a distal end of the one or more partially circumferential ribs, the circumferential raised rib configured to form a seal around the spike;
wherein a portion of the spike distal to the circumferential raised rib of the installed spike cap is in fluid communication with the one or more flowpaths in the body of the cassette, and wherein a portion of the spike proximal to the circumferential raised rib of the installed spike cap is in fluid communication with an outer surface of the body of the cassette.
4. The fluid handling cassette of claim 3 , wherein the installed spike cap comprises one or more partially circumferential raised ribs formed around the internal surface of the spike cap at a location that mates with the spike distal to the proximal base of the spike.
5. A fluid handling cassette configured to reversibly engage with a pump control unit for operating the cassette, comprising:
a body having an engagement side comprising a pump chamber formed as a depression in the engagement side of the body, a fluid inlet end and a fluid outlet end, the fluid inlet and outlet ends comprising one or more ports on the body in fluid communication with the pump chamber via one or more flowpaths in the body; and
a port on the fluid inlet end comprising a spike, the spike configured to mate with a connector of a fluid line when in use, or to mate with a spike cap when not in use;
the spike comprising a proximal base adjacent the fluid inlet end of the cassette, and a distal end configured to penetrate the fluid line connector;
the proximal base of the spike arranged to mate with a spike cap via a frictional contact between an external surface of the spike and an internal surface of the spike cap such that one or more gaps are present in said frictional contact so that a portion of the external surface of the spike is exposed to any gas or liquid to which an external surface of the body of the cassette is exposed when the spike cap is installed on the spike;
the internal surface of the spike cap comprising a circumferential raised rib that contacts the spike distal to the one or more gaps in the frictional contact, the circumferential raised rib configured to form a seal around the spike;
wherein a portion of the spike distal to the circumferential raised rib of the installed spike cap is in fluid communication with the one or more flowpaths in the body of the cassette, and wherein a portion of the spike proximal to the circumferential raised rib of the installed spike cap is in fluid communication with an outer surface of the body of the cassette.
6. The fluid handling cassette of claim 5 , wherein the installed spike cap comprises one or more partially circumferential raised ribs formed around the internal surface of the spike cap at a location that mates with the spike distal to the proximal base of the spike.