An insulin pump is a small device that delivers insulin continuously through a thin tube under the skin, replacing multiple daily injections. For many people with diabetes it offers more flexibility and steadier control, though it is a device worn around the clock and it still needs your involvement every day. This guide explains what a pump is, how it works, who uses one, and the single most important safety point that every pump user and family must understand.
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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.
This is general information and does not replace the advice of your diabetes team. A pump uses only rapid-acting insulin, so always keep backup insulin pens and ketone testing. Call 995 for signs of diabetic ketoacidosis (high glucose with ketones, vomiting, deep breathing, drowsiness) or a severe hypo.
What an insulin pump is
An insulin pump is a small electronic device that holds insulin and delivers it through a fine tube, called a cannula, that sits just under the skin. It takes the place of injecting insulin several times a day. The pump is worn continuously, including during sleep, and the cannula is moved to a fresh spot every few days. As Diabetes UK explains, pumps are used mainly by people with type 1 diabetes, and by some people with type 2. Whatever your type, the aim is the same: to match insulin more closely to what your body needs through the day, which for many people is easier to fine-tune with a pump than with fixed injections.
How it works: basal and bolus
A pump delivers insulin in two ways. It gives a small, steady trickle of background insulin through the day and night, called the basal rate, which can be set differently at different times. On top of that, you ask it for larger bolus doses at meals and to correct a high reading. Most pumps have a built-in calculator that suggests a dose from the carbohydrate you enter and your current glucose, but you still count the carbs and make the decision.
Who uses one
Insulin pumps are often considered for people who want more flexibility around meals and activity, who are looking for tighter glucose control, or who have troublesome or hard-to-predict hypos. They are not right for everyone, and they are not a cure or an autopilot. Your diabetes team assesses whether a pump suits you, your routine and your goals, and provides structured training before you start and support afterwards.
Tubed and patch pumps
There are two broad kinds. A tubed pump is a small unit, worn on a belt or in a pocket, connected by thin tubing to the cannula under the skin. A patch pump (also called tubeless) sits directly on the skin as a small pod and is controlled by a handset or phone, with no external tubing. Each has trade-offs, and your team can talk through which might suit your body, clothing and lifestyle. Systems are named only as examples; the choice is yours to make with your team.
Benefits and considerations
The reported benefits include more flexibility, the potential for better control, and no routine injections. The considerations are just as real: you wear a device all the time, there is a learning curve, and you still count carbohydrate, change the cannula site, respond to alarms, and stay engaged. A pump is a tool that works well when you work with it. Funding and cost vary, so discuss availability in Singapore with your diabetes team. It also helps to talk to people who already use a pump, so you get a realistic sense of the daily routine before you commit to it.
The rapid-acting-only safety point
This is the most important thing to understand about any pump. A pump uses only rapid-acting insulin, with no long-acting background insulin stored in the body. So if delivery is interrupted for any reason, a blocked or kinked cannula, a dislodged or leaking site, an empty reservoir, a flat battery or a pump fault, you are quickly left with almost no working insulin. Blood glucose and ketones can then rise fast toward diabetic ketoacidosis (DKA) within hours, faster than for someone on long-acting injections. Our sick-day guide covers this in detail.
Backup, your team and support in Singapore
Because of that safety point, you should always keep backup insulin pens (both rapid and long-acting), ketone testing, glucose and a note of your pump settings, and know in advance how to switch to injections if the pump fails. Your team includes an endocrinologist, a diabetes nurse educator and a dietitian, who set your insulin and train you. In Singapore, diabetes care is led by hospital diabetes services, and Diabetes Singapore offers education, counselling and peer support. For emergencies call 995, and if you are struggling emotionally, SOS is on 1767 and mindline.sg on 1771.
Related diabetes technology topics
- Continuous glucose monitoring (CGM)
- Choosing diabetes technology
- Automated insulin delivery
- Pump site care & changing sets
- Using CGM data & time in range
- Sick-day rules & preventing DKA
- Exercise & managing lows
- Travelling & flying
- Emotional wellbeing & daily life
- Endocrinologists in Singapore
Sources
- Diabetes UK — Insulin pumps: diabetes.org.uk
- American Diabetes Association — Insulin pumps: relief and choice: diabetes.org
- Breakthrough T1D — Insulin pumps: breakthrought1d.org.uk
- Diabetes Singapore: diabetes.org.sg