An insulin pump is a small, computerized device that delivers insulin continuously through a thin flexible tube (catheter) or a pod worn on the skin. Insulin pumps are used primarily for Type 1 diabetes but are also an option for Type 2 diabetes patients who require intensive insulin management.
How an Insulin Pump Works
A pump delivers insulin in two ways:
- Basal rate: A continuous, programmable low-dose infusion that provides background insulin around the clock, mimicking what a healthy pancreas delivers between meals and overnight. Multiple different basal rates can be programmed for different times of day.
- Bolus dose: On-demand insulin doses delivered for meals (based on carbohydrate content) or to correct high blood sugar. Modern pumps include bolus calculators that factor in carbohydrate intake and current glucose level.
The pump uses only rapid-acting insulin (no long-acting insulin needed), with the infusion set changed every 2–3 days.
Types of Insulin Pumps
- Traditional tubed pumps: The pump reservoir and pump body are worn on a belt/pocket with a thin tube connecting to an infusion set on the skin (e.g., Tandem t:slim X2, Medtronic 780G)
- Patch/tubeless pumps: A pod is worn directly on the skin with no tubing, controlled via a separate device or smartphone (e.g., Omnipod 5, Omnipod DASH)
Who Is a Good Candidate for a Pump?
- People with Type 1 diabetes who want tighter glucose control
- Those with frequent hypoglycemia or hypoglycemia unawareness
- People with significant dawn phenomenon (early morning glucose rise)
- Patients with variable schedules or eating patterns
- Those who find multiple daily injections burdensome
- Active individuals who want more flexibility
- Pregnant women with T1D requiring very tight glucose control
Insulin Pump + CGM = AID System
The most powerful current use of insulin pumps is in combination with a CGM to form an Automated Insulin Delivery (AID) system. The pump algorithm uses real-time CGM data to automatically adjust basal delivery, suspend insulin before predicted lows, and increase delivery when glucose is rising. The Omnipod 5, Tandem t:slim X2 with Control-IQ, and Medtronic 780G are all currently FDA-approved AID systems.
📊 Clinical Evidence: Studies show that pump therapy reduces A1C by 0.5–1.0% compared to multiple daily injections, and AID systems reduce hypoglycemia by up to 50% while increasing time in range by 10–15 percentage points.
Compare Insulin Pumps by Brand
Not all insulin pumps are the same. Here's a quick guide to the major AID systems available today — click any pump to read our full patient guide:
Tubeless patch pump · Dexcom G6 · No tubing · Ages 2+
Touchscreen · Control-IQ · Dexcom G6/G7 · Remote updates
SmartGuard · 100 mg/dL target · Guardian 4 · Auto boluses
Tubeless pod · Dexcom G7 · Sequel Medical Tech
No carb counting · Self-learning · Dexcom G6 · Bionic pancreas
Frequently Asked Questions About Insulin Pumps
Am I a good candidate for an insulin pump?
Insulin pumps are primarily used for Type 1 diabetes, but may also be appropriate for Type 2 diabetes patients on intensive insulin therapy. Good candidates include people with frequent hypoglycemia, high glucose variability, significant dawn phenomenon, or those who find multiple daily injections burdensome. A formal pump evaluation with your endocrinologist is the best way to determine candidacy.
What is an AID system (automated insulin delivery)?
An AID system — sometimes called a "closed loop" or "hybrid closed loop" — combines an insulin pump with a continuous glucose monitor (CGM) and an algorithm that automatically adjusts insulin delivery based on real-time glucose readings. Current FDA-approved AID systems include the Omnipod 5, Tandem t:slim X2 with Control-IQ, Medtronic MiniMed 780G, and Beta Bionics iLet.
Does insurance cover insulin pumps?
Most commercial insurance plans and Medicare Part B cover insulin pumps for eligible patients with Type 1 diabetes, though prior authorization is typically required. Coverage for newer systems like the Twiist is still expanding. Our team assists with benefit verification and prior authorization paperwork as part of the pump consultation process.
Can I swim or shower with an insulin pump?
It depends on the pump. The Omnipod 5 and Twiist are tubeless patch pumps that are waterproof and can be worn while swimming. The Tandem t:slim X2 is rated for brief water exposure (rain, splashing) but not swimming. The Medtronic 780G is also water-resistant but not designed for prolonged submersion. Always check your specific pump's waterproofing rating.
What is the difference between a tubed pump and a tubeless pump?
A traditional tubed pump has a separate pump body (worn on a belt, in a pocket, or clipped to clothing) connected to an infusion set on the skin via a thin flexible tube. A tubeless pump (like the Omnipod 5 or Twiist) integrates the reservoir, pump mechanism, and cannula into a single pod worn directly on the skin — no tubing required. Tubeless pumps are more discreet and preferred by active patients, while tubed pumps often have longer track records and more setting customization.
Do I still need to count carbs with an insulin pump?
Most AID systems still require carbohydrate counting to calculate meal boluses accurately, though the algorithm handles basal insulin automatically. The exception is the Beta Bionics iLet, which requires only a qualitative meal announcement ("usual / more than usual / less than usual") — no carb counting. Accurate carb estimation still improves post-meal glucose control on all systems.
How do I get started with an insulin pump in Houston?
The first step is a pump evaluation appointment with one of our board-certified endocrinologists. We'll review your glucose history, lifestyle, and insurance to recommend the best system for you. We then handle the prescription, prior authorization, pump start, and ongoing optimization visits. Call 832-968-7003 or book online to get started.
Key Takeaways
- Insulin pumps deliver both continuous basal insulin and on-demand meal/correction boluses
- Tubed pumps and tubeless pods (Omnipod) are the two main types
- Pumps are most effective when paired with CGM in an automated insulin delivery system
- AID systems dramatically reduce hypoglycemia and improve time in range
- An endocrinologist is essential for pump initiation, programming, and ongoing optimization
Current FDA-Approved AID Systems at a Glance
| Pump | Type | CGM | Key Feature |
|---|---|---|---|
| Omnipod 5 | Tubeless Pod | Dexcom G6/G7 | No tubing, waterproof, smartphone control |
| Tandem t:slim X2 | Tubed | Dexcom G6/G7 | Auto corrections, software updates over internet |
| Medtronic MiniMed 780G | Tubed | Guardian 4 | Tightest auto target (100 mg/dL), corrections q5min |
| Twiist | Tubed | TBD | Modern app-first design, twist-to-fill reservoir |
| Beta Bionics iLet | Tubed | Dexcom G6 | No carb counting, weight-based setup, self-adapting |
Frequently Asked Questions
An insulin pump is a small, computerized device that delivers rapid-acting insulin continuously through a thin tube (catheter) or waterproof pod worn on the skin. It replaces the need for multiple daily injections by providing a steady background basal rate plus on-demand meal and correction boluses, closely mimicking what a healthy pancreas does.
Tubed pumps (like the Tandem t:slim X2 and Medtronic MiniMed 780G) connect to an infusion set under the skin via a thin flexible tube, with the pump body worn in a pocket or on a belt. Tubeless pumps (like the Omnipod 5) consist of a waterproof pod that adheres directly to the skin with no external tubing, controlled by a smartphone or separate handheld device.
An Automated Insulin Delivery system combines an insulin pump with a continuous glucose monitor (CGM). The pump's algorithm reads CGM glucose values every 5 minutes and automatically adjusts insulin delivery up or down to keep glucose in range. FDA-approved AID systems include the Omnipod 5, Tandem t:slim X2 with Control-IQ, Medtronic MiniMed 780G, and Beta Bionics iLet.
There is no single best pump for everyone. The Omnipod 5 is popular for its tubeless, waterproof design and smartphone control. The Tandem t:slim X2 is excellent for people who want automatic correction boluses and software updates. The Medtronic 780G offers the tightest automated target (100 mg/dL). The Beta Bionics iLet eliminates carb counting. Our endocrinologists can help you choose based on your lifestyle, insurance, and goals.
Most pumps still require carbohydrate estimates for meal boluses, though AID algorithms provide a safety net that partially compensates for inaccurate counting. The Beta Bionics iLet is a notable exception — it uses only a simplified "usual/more/less" meal announcement with no carb counting required.
Yes. Most major commercial insurance plans, Medicare, and Medicaid cover FDA-approved insulin pumps for qualifying patients with diabetes who require intensive insulin management. Coverage requires a physician prescription and prior authorization. Our clinic helps navigate the insurance process for all patients considering pump therapy.
Starting pump therapy requires evaluation by an endocrinologist who will assess your candidacy, recommend the most appropriate pump, submit prior authorization to your insurance, coordinate pump start education with the device manufacturer, and provide ongoing follow-up. Endocrine & Diabetes Plus Clinic of Houston offers comprehensive pump management at both Sugar Land and Memorial City locations. Book an appointment to get started.
Yes. While insulin pumps are most commonly used in Type 1 diabetes, patients with Type 2 diabetes who require intensive insulin therapy — particularly those with complex insulin needs, frequent hypoglycemia, or significant variability — may also benefit from pump therapy. Your endocrinologist can determine if pump therapy is appropriate for your specific situation.