Insulin Pump: Complete Guide to Types, Use, and Safety in Children
Introduction
An insulin pump is a small, battery-powered medical device that delivers insulin into the body continuously throughout the day. It replaces the need for multiple daily insulin injections and gives much more precise control over blood sugar levels.
Insulin pumps have been used in clinical practice for decades. Today, they are one of the most widely used and well-studied tools in diabetes management, particularly for people with Type 1 Diabetes. Modern pumps are smaller, smarter, and more connected than ever before.
What is CSII?
The medical term for insulin pump therapy is Continuous Subcutaneous Insulin Infusion (CSII). "Subcutaneous" means the insulin is delivered just under the skin, not into a vein.
Purpose and Where It Is Used
The main purpose of an insulin pump is to keep blood sugar (glucose) levels within a healthy range by delivering insulin automatically and on demand.
Primary Use
- Type 1 Diabetes: The pancreas produces little or no insulin. Insulin must be provided from outside the body. This is the most common use of insulin pumps.
- Type 2 Diabetes: In some cases where oral medications and injections are not enough, a pump may be used.
- Other insulin-dependent conditions: Such as pancreatogenic diabetes (diabetes due to pancreas disease or surgery).
How It Delivers Insulin
The pump works in two ways:
| Delivery Type | What It Means | When It Happens |
|---|---|---|
| Basal Rate | A small, steady amount of insulin delivered continuously (e.g., 0.5 to 2 units per hour) | All day and night, automatically |
| Bolus Dose | A larger amount of insulin given at specific times | Before meals or to correct a high blood sugar reading |
Where It Is Used
- Hospitals and diabetes care centres worldwide
- At home, school, or during daily activities
- During sports, travel, or outdoor activities
- Neonatal intensive care units (NICU) in special clinical settings
Types of Insulin Pumps
There are three main categories of insulin pumps used today.
Most Common
Traditional (Tubed) Pump
A small device worn on a belt or in a pocket. Insulin flows through a thin plastic tube (catheter) to a cannula inserted under the skin. The insertion site is usually on the abdomen, upper arm, or thigh.
Tubeless
Patch Pump (Pod-based)
A small pod sticks directly on the skin. There is no tube. The pod contains the insulin reservoir and delivers insulin wirelessly through a built-in cannula. It is controlled by a separate handheld device or smartphone.
Advanced
Hybrid Closed-Loop System
Also called an Artificial Pancreas or APS. This pump is connected to a Continuous Glucose Monitor (CGM). The CGM constantly reads blood sugar, and the pump automatically adjusts insulin delivery. Requires minimal manual input for basal rates.
Specialised
Implantable Insulin Pump
A pump surgically placed under the skin of the abdomen. It delivers insulin directly into the peritoneal cavity (intra-peritoneal). Less commonly used, only in specific clinical situations. Not widely available globally.
| Feature | Traditional Pump | Patch Pump | Hybrid Closed-Loop |
|---|---|---|---|
| Tubing | Yes | No | Varies |
| CGM Integration | Optional | Optional | Required |
| Auto Dose Adjustment | No | No | Yes (partial) |
| Waterproof | Most models: yes | Yes | Model-dependent |
| Cartridge Refill | Every 2-3 days | Every 3 days (new pod) | Every 2-3 days |
How to Use an Insulin Pump: Step-by-Step Guide
Important Before Starting
An insulin pump must be prescribed and set up by a qualified diabetes care team. Initial programming of basal rates, insulin-to-carb ratios, and correction factors must be done by a healthcare professional. The steps below are a general guide to daily use.
Part 1: Setting Up the Pump
1
Gather SuppliesYou will need: the insulin pump, insulin vial or cartridge, infusion set (tubing + cannula), insertion device (if applicable), alcohol swabs, and adhesive tape or patch.
2
Wash Hands ThoroughlyClean both hands with soap and water for at least 20 seconds before touching any part of the infusion set or pump.
3
Fill the ReservoirDraw insulin from a vial into the pump's reservoir (insulin cartridge) according to the manufacturer's instructions. Remove all air bubbles by gently tapping and expelling air.
4
Load the Reservoir into the PumpInsert the filled reservoir into the pump body. Follow the device-specific instructions for locking it in place.
5
Prime the TubingFill the tubing with insulin until a small drop appears at the tip of the cannula. This removes air from the line. Do not skip this step - air in the tube can interrupt insulin delivery.
Part 2: Inserting the Cannula (Site Preparation)
6
Choose and Clean the SiteCommon sites: abdomen (2 inches away from navel), upper buttocks, outer thigh, upper arm. Clean the area with an alcohol swab and let it dry completely for 30 seconds.
7
Insert the CannulaUse the insertion device (auto-inserter) or manual technique to push the cannula under the skin at the correct angle (usually 30-45 degrees for angled sets, 90 degrees for straight sets). Remove the needle; the soft cannula remains under the skin.
8
Secure the SitePress the adhesive patch firmly to the skin. For children or those with active lifestyles, additional medical tape may be used to secure the site.
9
Give a Small Prime BolusAfter insertion, give a small dose (as instructed by the healthcare team) to fill the cannula. Check blood glucose 1-2 hours after a new site is placed to confirm the site is working properly.
Part 3: Daily Use
10
Deliver Bolus Before MealsUse the pump's bolus calculator (if available) or manually enter the carbohydrate count and current blood sugar to calculate the mealtime dose. Confirm and deliver the bolus.
11
Set Temporary Basal Rates When NeededDuring exercise, illness, or other situations, a temporary basal rate may be needed. This is set as a percentage increase or decrease for a specific duration, as guided by the diabetes team.
12
Change the Site Every 2-3 DaysThe infusion set must be changed at least every 48-72 hours to prevent infection, skin irritation, and poor insulin absorption. Rotate sites with each change.
13
Check Alarms and AlertsReview the pump's alarms regularly. Common alerts include: low battery, low insulin, occlusion (blockage), and high/low blood glucose (if CGM-integrated).
Precautions and Potential Dangers
Known Risks
Diabetic Ketoacidosis (DKA) - Serious Risk
Because insulin pumps use only rapid-acting insulin (no long-acting background insulin), any disruption in delivery - such as a blocked cannula, kinked tube, or pump failure - can lead to a rapid drop in insulin levels. This can cause DKA within hours. Blood sugar and ketones must be checked if the pump malfunctions or is disconnected for more than 1-2 hours.
Hypoglycaemia (Low Blood Sugar)
Incorrect bolus calculations, missed meals after a bolus, or excessive exercise without adjusting the basal rate can cause blood sugar to drop dangerously low. Symptoms include shaking, sweating, confusion, and in severe cases, loss of consciousness.
Infusion Site Infection
Leaving a cannula in place for more than 72 hours or poor hygiene during site changes increases the risk of skin infection. Signs include redness, swelling, pain, or discharge at the site. Any infected site must be removed immediately and a new site used.
Skin Problems
Repeated use of the same skin area can cause lipohypertrophy (fatty lumps under the skin). These lumps reduce insulin absorption. Site rotation is essential to prevent this.
Additional Precautions
- MRI and medical imaging: Insulin pumps must be removed before an MRI scan. Always inform the radiology team about pump use before any scan or procedure.
- Water activities: Many pumps are water-resistant, not fully waterproof. Check the specific waterproof rating of the device. Some pumps can be disconnected briefly for swimming.
- Air travel: Insulin pumps are generally allowed on flights. Carry a letter from the prescribing doctor. Keep insulin at the correct temperature (avoid overhead bins where temperature varies). Inform airport security before passing through scanners.
- Extreme temperatures: Insulin degrades in heat above 37 degrees C and freezes below 0 degrees C. Never leave the pump or insulin in direct sunlight, a hot car, or a freezer.
- Power outages: Always keep spare batteries and have a backup insulin pen and long-acting insulin available in case the pump fails.
- Physical contact sports: The pump should be protected or temporarily disconnected during contact sports to avoid damage or dislodgement.
Frequently Asked Questions (FAQ)
At what age can an insulin pump be started?
There is no minimum age. Insulin pumps have been used safely in infants, toddlers, and young children when prescribed by a specialist. The decision depends on the clinical need, blood sugar control, and the ability to manage the device responsibly.
Does wearing an insulin pump hurt?
The initial insertion of the cannula may cause a brief sting or discomfort, similar to a small injection. Once the cannula is in place, most people do not feel any discomfort. Using numbing cream before insertion can help reduce the sensation, especially in young children.
Can the pump be removed temporarily?
Yes, most pumps can be disconnected for short periods - typically up to 1-2 hours. For longer disconnection, a replacement dose of insulin (usually via injection) is needed. The diabetes care team provides specific guidance on how to handle disconnection.
What type of insulin is used in a pump?
Only rapid-acting insulin analogues are used in pumps. The most commonly used are insulin lispro (Humalog), insulin aspart (NovoRapid), and insulin glulisine (Apidra). Long-acting insulin is never used in a pump.
How is the pump worn at night?
The pump can be placed on the bed beside the user, clipped to pyjamas, placed in a small pouch worn around the body, or tucked under a pillow. Tubed pumps should have enough length to allow normal movement during sleep. Patch pumps remain attached to the skin continuously.
Does an insulin pump replace blood sugar testing?
A standard insulin pump does not include blood sugar monitoring. A separate glucometer or Continuous Glucose Monitor (CGM) is still needed. However, hybrid closed-loop systems integrate a CGM directly with the pump for automatic adjustments.
What happens if the pump stops working?
If the pump stops working, blood sugar will rise because there is no background insulin. Immediately switch to insulin injections using a backup insulin pen. Check blood sugar and ketones. Contact the diabetes care team for guidance. Never go without insulin.
Can the pump be used during sports and exercise?
Yes, with adjustments. The basal rate is often reduced before and during prolonged exercise to prevent low blood sugar. The pump can be disconnected briefly for contact sports. The diabetes care team provides specific exercise protocols based on the individual.
Is the insulin pump funded or covered by insurance?
Coverage varies widely by country and insurance plan. In many countries, insulin pumps are covered for Type 1 Diabetes under national health programmes or private insurance. In some regions, funding is available only for specific age groups or criteria. Check with the local healthcare system or insurance provider for details.
How to Keep the Insulin Pump Safe and Working Well
Daily Care
- Inspect the pump and tubing each morning for kinks, cracks, air bubbles, or disconnections.
- Check the battery level and insulin reservoir level daily.
- Review the pump's alarm history for any alerts that were missed during sleep.
- Keep the pump screen clean with a soft, dry cloth - avoid harsh chemicals.
Site and Infusion Set Care
- Change the infusion set every 48 to 72 hours, or earlier if there is redness, pain, or loss of blood sugar control.
- Always rotate sites - use a different area each time (e.g., rotate between four quadrants of the abdomen).
- Never insert a cannula into a site that is bruised, scarred, lumpy, or infected.
- Keep the skin at the site dry and clean. Avoid lotions or creams at or near the insertion site.
Insulin Storage in the Pump
- Use insulin from a vial that has been at room temperature for at least 30 minutes before filling the reservoir.
- Do not use cloudy, discoloured, or expired insulin in the pump.
- Insulin in the pump reservoir should not be used beyond 3 days (72 hours), even if the reservoir is not empty.
- Spare insulin vials should be stored in a refrigerator (2 to 8 degrees C). An opened vial can be kept at room temperature (below 25 to 30 degrees C) for up to 28 days, depending on the brand.
Device Maintenance
- Keep an updated list of the pump's settings (basal rates, carb ratios, correction factors) in case the pump needs to be reset or replaced.
- Register the pump with the manufacturer for warranty and recall alerts.
- Follow the manufacturer's guidelines for software updates if the pump is connected to an app or computer system.
- Keep the pump away from strong magnetic fields, X-ray machines, and metal detectors where possible.
Emergency Preparedness
Always keep a backup kit: rapid-acting insulin pen, long-acting insulin pen, glucometer and test strips, ketone test strips, fast-acting sugar (glucose tablets or juice), and a written copy of the current insulin doses. This is important at home, school, and during travel.
When to Seek Immediate Medical Help
Go to Emergency Care Immediately If:
- Blood sugar is very high (above 300 mg/dL or 16.7 mmol/L) and does not come down after 2 correction doses
- Ketones are moderate or high (above 1.5 mmol/L on a blood ketone meter, or a 2+ reading on a urine strip)
- There is vomiting, abdominal pain, or difficulty breathing
- Blood sugar is very low (below 70 mg/dL or 3.9 mmol/L) and does not improve after treatment with sugar
- There is loss of consciousness or confusion
- The infusion site shows signs of severe infection (spreading redness, fever, pus)
Insulin Pump vs. Multiple Daily Injections: A Quick Comparison
| Aspect | Insulin Pump | Multiple Daily Injections (MDI) |
|---|---|---|
| Number of needle insertions | Every 2-3 days (one site change) | 4-6 injections per day |
| Basal insulin delivery | Continuous, programmable by hour | Fixed doses of long-acting insulin |
| Flexibility for meals | High (adjustable bolus) | Moderate |
| Risk if device fails | DKA can develop quickly | Lower immediate risk |
| HbA1c improvement | Moderate to significant improvement in many studies | Effective with consistent adherence |
| Cost | Higher (device + consumables) | Lower |
| Training required | Extensive | Moderate |
Travelling with an Insulin Pump
- Carry the pump, insulin, and all supplies in hand luggage only - never in checked baggage where temperatures can drop to unsafe levels.
- Carry at least twice the amount of supplies needed for the trip to account for delays, losses, or damage.
- Carry a medical ID card or letter from the prescribing doctor, especially when crossing borders or going through airport security.
- Time zone changes affect when bolus doses are given and when site changes are due. Plan this with the diabetes care team before travel.
- Some insulin pump manufacturers offer a loaner device or supply service internationally. Check with the manufacturer before travel.
References and Recommended Resources
The following official sources and textbooks are recommended for further reading. No links are provided as websites are subject to change.
- American Diabetes Association (ADA) - Standards of Medical Care in Diabetes (updated annually) - available at diabetes.org
- International Society for Pediatric and Adolescent Diabetes (ISPAD) Clinical Practice Consensus Guidelines
- National Institute for Health and Care Excellence (NICE) UK - Technology Appraisal TA151 and TA943 on Insulin Pump Therapy
- Pickup, J.C. (Ed.) - Insulin Pumps and Continuous Glucose Monitoring - Oxford University Press
- World Health Organization (WHO) - Diabetes resources - who.int/diabetes
- JDRF (formerly Juvenile Diabetes Research Foundation) - jdrf.org
- Pediatric Endocrine Society - pedsendo.org
- Diabetes UK - diabetes.org.uk (UK-specific guidance)
- Endocrine Society Clinical Practice Guidelines - endocrine.org
Medical Disclaimer
The information on this page is intended for general educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Insulin pump therapy must be initiated, programmed, and monitored by a qualified healthcare professional. Diabetes management is highly individual - the settings, doses, and protocols described here are general guidelines only and may not apply to every person. Always follow the guidance of the treating medical team. In case of any medical emergency, contact emergency services or go to the nearest hospital immediately. PediaDevices is not responsible for any decisions made based on the information provided on this page.
Checked and Reviewed by a Pediatrician
This article has been reviewed for medical accuracy by a qualified pediatrician. Content is based on current clinical guidelines and evidence-based practice. Last reviewed: 2025.
Labels: Endocrine-System