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Syringe Infusion Pump Index
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B Braun |
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Baxter |
Baxter (Autosyringe)
AS20S |
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Disetronics |
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Excelsior |
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Marcal Medical |
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McGaw |
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Minimed Pumps |
Minimed 404SP |
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Medex |
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Sims-Deltec |
Syringe pumps are devices generally used for small-volume infusions with very low flow rates. Volume to be infused is limited by the size of the syringe, with a maximum of 140 ml., the size of the largest commercially available syringe (the Excelsior pump will infuse the larger syringes). Rate maximums are approximately 100 ml/hr., although both the Becton- Dickinson (McGaw) 360 and the Baxter (Autosyringe) AS40A and AS50A will deliver at 360 ml/hr.
Most syringe pumps are ambulatory, some having pouch accessories and many running on disposable alkaline or internal rechargeable batteries. Most operate by having a motor turn a long drive screw, attached to a holder into which the filled syringe is inserted. The motor turns the drive screw, which gradually depresses the plunger of the syringe until the syringe is emptied. Most syringe pumps also require extension tubing with M/F luer lock endings, including the Sims Deltec CADD-Micro, the only Deltec pump that does not use M/M luer extension tubing.
Many syringe pumps, despite having a single motor speed, have variable rates depending on the size of the syringe used. For instance, if you insert a 5 ml. BD syringe into a Bard 300XL syringe pump, it will deliver the entire syringe at a rate of 15.9 ml/hr at medium speed. At the same speed, a 60 ml BD syringe will deliver at a rate of 78.1 ml/hr; even though the motor speed is the same (the plunger closes at the same rate of travel), the larger volume of the syringe allows more fluid to be infused. For this reason, many syringe pumps include charts in the operating manual to help the clinician calculate the flow rate, some of which are included in this section.
Another delineation among syringes pumps is whether the pump is time-limited. Pumps such as the Baxter 150XL and 300XL, the McGaw 360, and the Excelsior are limited to approximately one hour of infusion time. If the patient requires syringe medication over periods of time longer then one hour, these pumps cannot be used without constant changing of empty syringes. Instead, the clinician can use syringe pumps which can infuse for longer durations, such as the Graseby, Medis Infusa, and Baxter Autosyringe pumps.
Although most syringe pumps use standard syringes by BD, Monoject, or Terumo, some syringe pumps such as the Minimeds and Sims Deltec CADD-Micro require dedicated syringes for operation. The Disetronics Panomat T-5 requires dedicated 5 ml. glass cartridges. Check the section on each pump for reorder numbers.
If a customer requires a pump for insulin injection, they should be directed toward the Minimed 506 (the updated revision of the earlier 504S) or the MN507 and MN507C (which have since replaced the 506). These pumps are made specifically for insulin infusion, since they delivers in units of insulin rather than metric units, and allow meal bolus programming required by many insulin therapies.
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