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SYRINGE PUMP

 Syringe pump

Syringe pump is a medical device used to deliver very small amount of drugs or other medicinal fluids and gradually transfer precise volumes of fluid to the patient. The stepper motor turns in the opposite direction, then the pusher block moves and the syringe plunger is pulled, thus the fluid draws into the syringe. 



Functions of syringe pump

Syringe pump is derived from the actual application of infusion pump. Both are same, but gradually differ from holding the syringe. Syringe pump can accommodate with multiple syringes. It can operate at very small volumetric flows ( micro and nano). It provides very high accuracy and no pulse flow. The fact of the syringe pump lies in that the user can effortlessly adjust the working range of the device by altering the position of the syringe. Generally, in the syringe pump smaller syringe allows better control at lower flow rates and they are smaller in dispensable volumes. Otherwise, a larger size syringe allows control at larger volumes however reduces the performance of the device at low flow rates. It is important to remember that the elasticity in the pump allows a smoother flow rate and increase its stability, but reduces its responsiveness. Hence, it obtain the best elasticity in the fluid work must be prevented and the fluid resistance of the chip should be reduced.

Types of Syringe pump
      
1.Medical Syringe pump
                 
              The medical syringe pump is a device that delivers a controlled amount of fluid (such as nutrients, blood and drugs) to a patient. They are suitable for in diagnosis, treatment and research. To monitor the accurate rate and safe use of the medical syringe pump, it has a wide range of optical and alarms to prevent injury or it may even cause death from air bubbles and other hazards.

  2.Research Syringe Pump:

                 These syringe pump are used in research laboratories that requires very small fluid delivery devices. Research syringe pumps are smaller in volumes and provide additional features that are beneficial for research but are impractical for other use.

Parts in syringe pump

• Syringe holder
• Plunger
• LCD screen
• Battery
• Power supply

Syringe holder
Syringe holder helps to hold the syringe in its place during the operation of device.

Plunger
Plunger that initiates the flow of the syringe when the motor drives it’s plate.

LCD screen
 Syringe pump has LCD screen that allows easy programming of flow rate and volumes.

Battery 

Lithium-ion smart battery which remains battery life and battery is rechargeable. Battery status available on the display. It is 6v , 2.2Ah and it has minimum 10hrs capacity .

Power supply
         
It is 100-240V and 60HZ with functional earth. The power supply has SMPS (Switch mode power supply) . It is a high frequency power conversion device and it helps in converting level of voltage to voltage or current required for the function

Troubles in Syringe pump
  •  Occlusion Alarm
  • Disengagement Alarm
  •  Keypad Alarm
  •  Force sensor Alarm
  • Battery charge and temperature
Troubleshooting

1. Occlusion Alarm

  •               If occlusion alarm occurs after the device has been turned ON, it’s because of wrong calibration of the force sensor or force sensor problem. Recalibrate and check the force sensor.
  •      If Occlusion alarm occurs during the infusion it’s because of the pressure limit is too low, wrong calibration of force sensor. Set the pressure limit at high or recalibrate and check the force sensor.
2. Disengagement Alarm:

  •  Disengagement switch is defective.
  • Replace the disengagement switch and check the connection  of the functionality of the cable.
3. Keypad Alarm

          If Keypad error or some function of the keys in the keypad is not working then keypad is defective. Check and replace the new keypad. 

4. Force sensor Alarm

     When force sensor is damaged or defective we Should change the force sensor or either should be pump is condemned.

5. Battery charge and temperature
              
 If battery charge or temperature error occurs Check the battery charging voltage and status. Replace the battery or replace the power supply.

Advantage
• Syringe pump are comfortable to use and fast
• Syringe pump has high pressure it helps in setting target pressure or control at constant pressure in experiment
• Syringe pump helps to maintain at high accuracy and accurate speed.

Disadvantage
• Limits that updated in the syringe pump may various from volume of the syringe from dispensing fluid volume.
• The flow rate during the Infusion period cannot be known without flow sensor.










Article prepared by 

Er. Pradeep V


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