Surgical apparatus and instruments; medical, dental and veterinary apparatus and instruments, and parts and accessories therefor, namely, bloodlines in the nature of blood tubing sets for medical purposes, medical tubing for carrying blood from patient through the dialyzer and back to the patient and bloodline components in the nature of dialyzer connectors, recirculation connector, injection ports, transducer protectors, venous bubble catchers in the nature of flow chambers for attachment to medical tubing for trapping air bubbles and filtering of foreign particles, pinch clamps for clamping medical tubing, patient connectors in the nature of rotating luer lock to connect the line to the patient, arterial bubble catchers in the nature of flow chambers for attachment to medical tubing for trapping air bubbles; Treatment machines, instruments, apparatus and devices for blood treatment, and parts and accessories therefor, namely, dialysis machines, dialyzer connectors in the nature of medical dialyzer tubing connectors, injection ports in the nature of vascular access ports for medical use, apparatus for blood analysis, blood transfusion apparatus, blood component separation apparatus for medical purposes, apparatus and equipment for use in treating chronic renal failure and for use on dialysis machines, namely, dialysis system filters, adaptors in the nature of medical tubing connectors, dialysis membranes and catheters, in particular for treatment and/or processing of infusion solutions and bodily fluids, including blood