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W S Jackman

Publications and source records attributed to W S Jackman.

10 recordsLinked to original sources
PubMed1979

An open-loop insulin delivery device for the control of experimental diabetes.

A new insulin delivery device has been developed and tested. It includes a reservoir, a pump, and a power pack. The reservoir holds 75 ml and is coupled to a precision peristaltic pump whose delivery can be set to any one of 128 different flow rates from 0 to 80 microliter/min (+/- 1.6% over 10 months) using the flow rate controller included in the battery power pack. The system weighs 525 g, consuming 50 mW at the maximum pumping rate, proportionately less at lower rates. Ten pumps have undergone bench tests for 30 days. One has been subjected to an extended life test of 16 months without change of tubing while seven complete systems have been used on dogs to demonstrate their capability for precise long-term (up to 16 months) intravenous insulin therapy. With this system, experimental diabetes has been controlled in 7 dogs for periods now extending beyond 16 months. This device now qualifies for-long term studies on hospitalized patients with diabetes mellitus.

Animals↗
PubMed1978

A portable precision pumping system for chronic, programmed insulin infusion.

This paper provides some details of a new insulin delivery system which includes a reservoir, a pump and a power pack. The reservoir holds 50 ml and is coupled to a precision peristaltic pump whose delivery can be set to any one of 128 different mean flow rates from 0 to 80 microliter/min (+/- 1.6% over 10 months) using the flow rate controller included in the battery power pack. The system weighs 525 g consuming 60 mW at the maximum pumping rate, proportionately less at lower rates. Ten pumps have undergone bench tests for 30 days. One has been subjected to an extended life test of 11 months while seven complete systems have been used on dogs to demonstrate their capability for precise longterm intravenous insulin therapy. With this system experimental diabetes has been reversed in 4 dogs for periods now extending beyond 6 months. This device now qualifies for long-term studies on hospitalized patients with diabetes mellitus.

Animals↗
PubMedDate not supplied

For insulin infusion: a miniature precision peristaltic pump and silicone rubber reservoir.

This paper describes a miniature precision peristaltic pump and a silicone rubber reservoir developed for the infusion of insulin in diabetic subjects. The ability of the 100-ml reservoir to maintain sterility of its contents over 26 refilling cycles (48 days) is demonstrated. Accelerated bench tests on 10 pumps over 30 days indicate an accuracy of +/- 1% on flow rate whether measured over 10 min or 24 h and with or without 1 atm of outlet back pressure. Comparison of calibrations made before and after 58 animal and clinical tests of 6--71 days' duration showed a percentage difference in calibration that varied with a mean +/- SD of 0.05 +/- 3.09%. Microscopic examination of pump tube samples after 21 days of clinical use indicated redistribution of surface material without evidence of particle spallation. Samples subjected to accelerated wear equivalent to 620 days of clinical use showed extensive luminal surface modification and particulate deposits on downstream filters. These were identified by X-ray spectroscopy as silicon compounds.

Animals↗