Mini Gastric Bypass Perth

Mini Gastric Bypass Surgery for Weight Loss

Benefits of mini gastric bypass surgery in Perth

The first step is easy.

“Weight loss (Bariatric) Surgery has significant health benefits such as reducing the risk of death from many causes. It is important to maintain a healthy lifestyle even after surgery”


Omega loop bypass surgery is also known as Mini Gastric Bypass Surgery or Single Anastomosis Gastric Bypass Surgery. This procedure was developed 20 years ago and has increasingly become more popular due to its effectiveness in weight loss.

This process involves 2 main steps:

  • Similar to gastric sleeve surgery, the first step is creating a small stomach mini sleeve (also called pouch) and sealed off with a surgical stapler. This sleeve is slightly shorter in this case though.

  • The second step involved joining the small intestine to the lower end of the stomach pouch.

As a result, you will feel full soon while eating. However, because the intestine is attached to the stomach further along, the food essentially is able to take a shortcut through the small intestine and approximately 200cm of the small intestine is bypassed. As a result of this shortcut, less calories are absorbed after eating.

The mini gastric bypass surgery also has an significant effect on a range of digestive hormones. This results in:

  • Reduced hunger

  • Improved blood sugar control particularly in people with type 2 diabetes

  • A reset in the body’s normal weight range which is often known as the set-point.

Mini gastric bypass procedure

It’s Not Just Weight Loss.
It’s Health Gain.

Being overweight or obese is one of the leading risk factors for ill health in Australia. The longer you live with obesity, the greater the negative effect on your physical health, mental health and wellbeing.

Unfortunately, diets won’t work for many people and this is when bariatric surgery (also known as weight loss or obesity surgery) can help you achieve lasting results. These surgeries have continued to advance with research and technology and are safe and effective.

Surgery works by influencing hunger and the way in which the body process food/calories. It is expected that following weight loss surgery, a patient is able to eat every day normal healthy food (in a smaller quantity), participate in normal every day activities and enjoy a great quality of life.

Calculate Your BMI

Your BMI is

BMI Calculator

  • Under 18.5 – you are very underweight and possibly malnourished.
  • 18.5 to 24.9 – you have a healthy weight range for young and middle-aged adults.
  • 25.0 to 29.9 – you are overweight.
  • Over 30 – you are obese.

Benefits & Risks of Mini Gastric Bypass

Benefits of mini gastric bypass surgery

  • Reduce up to 85% excess weight.

  • Omega Loop or Mini bypass surgery takes shorter operating time than the Roux en Y gastric bypass surgery.

  • It is also lower risk than Roux en Y gastric bypass.

  • More effective than gastric sleeve in remission of Type 2 diabetes and improvement of other conditions.

  • No foreign objects are placed such as with the gastric band surgery.

  • Less dietary restrictions when comparing to lap band surgery.


Risks of mini gastric bypass surgery

  • About 1% of patients experience leakage or major bleeding in first 8 wks.

  • In some cases, foods high in sugar may lead to abdominal discomfort, diarrhoea and feeling unwell sometimes known as dumping.

  • Sometimes, patients can develop heartburn (bile reflux) that can worsen later.

  • If you will not take multivitamins regularly, nutritional deficiencies can occur. This is really essential after bypass surgery.

The Procedure
The Procedure

Following the completion of the pre-operative surgery programme everything will be in place for safe and successful surgery. It is natural to be anxious on the day of surgery. Rest assured that the Dr. Andrew Kiyingi has a reputation as a meticulous surgeon. Try to have a light and relaxed schedule the day prior to surgery and good night sleep. Please pay extra special attention to the diet and fasting instructions from our Specialist Bariatric Anaethetist. It’s important to note that fasting includes no chewing gum.

On the day of surgery, you will be again greeted by Dr. Andrew Kiyingi and his Specialist Anaethetist. Please feel free to ask any additional questions. The procedure is performed under general anaesthesia. The key-hole (laparoscopic) procedure involves making 6 small incisions (2cm) on your abdomen. Carbon dioxide gas will be used to expand your abdomen, allowing the organs to be seen. A special narrow camera called a laparoscope, will be inserted through one incision and a video image will be relayed to a tv screen to allow Dr. Andrew Kiyingi to perform the surgery. Further small instruments will be inserted through the other incisions as required to complete the operation. During surgery your liver will be gently lifted up to reveal the stomach. The stomach will then be carefully freed from its attachments and surrounding organs. Dr. Andrew Kiyingi will assess if you have a Hiatus Hernia defect and repair it if required (read more here). A stomach sizing guide called a bougie will then be passed into your stomach. This bougie ensures consistent and accurate sizing of your new smaller stomach pouch. Dr. Andrew Kiyingi with then carefully staples along this sizing guide ensuring that each staple forms a tight seal. This stapler will divide the old stomach from the new smaller stomach pouch. The old stomach is not removed and remains healthy in the abdomen but does not receive food.

Dr. Andrew Kiyingi will then accurately measure the small intestine and determine the appropriate length to bypass (usually 150 – 200cm). This loop of intestine is then brought up and joined to the small stomach pouch. A special leak test is then performed to ensure everything is secure. Dr. Kiyingi will then apply special local anaesthesia to minimise any discomfort following surgery.

At the end of the procedure, the incisions are closed with dissolving sutures and covered with a waterproof dressing. The operation will be complete when you wake up and you will stay in the recovery unit for some time till you are ready to return to the surgical ward. It is common to feel tired after surgery.

Omega loop bypass After Care
Omega loop bypass After Care
  • Average length of stay after surgery: 2 – 3 Nights (Approx)
  • Dr. Andrew Kiyingi will visit you daily to check recovery
  • Initially your diet will involve a fluid diet in the hospital
  • Anti-nausea medications and pain relief will be provided for your comfort
  • Gentle walking is encouraged

At Home

  • Take your anti-acid medication
  • Take chewable multivitamin (BN Brand – Twice-daily)
  • Follow the dietary plan advised by our dietician or surgeon
MBS Item Number: Laparoscopic Gastric Bypass
MBS Item Number: Laparoscopic Gastric Bypass

For Private Health Insurance, you may want to note the below MBS item number:

MBS Item Number: 31572 Laparoscopic Gastric Bypass

Cost of Omega Loop Bypass Surgery

“During your consultation our Practice Manager will outline the cost involved for surgery and aftercare.”


Privately Insured

If you are Privately Insured, it is important to contact your private health insurer to check that your level of cover is adequate for the item numbers we have listed below. Generally, you will require top level or gold cover and should have completed the waiting period. Medicare cover only a small portion of the surgery fees.



If you are Uninsured, we are still happy to proceed with surgery. However, we will receive a separate quote from the hospital for your private hospital stay. Our practice manager will discuss this during your appointment.

Superannuation Funds

Superannuation Funds

Some patients choose to utilise early access of Superannuation funds. These may be privately insured patients who may use Superannuation to cover any fees or gaps not covered by their insurance, or uninsured patients who may use Superannuation to cover the full surgery programme amount. We are happy to support in this depending on your circumstances.

Dr. Andrew Kiyingi (MSurg FRACS)

General Surgeon and Bariatric Surgery Specialist

Dr Kiyingi is a Specialist Weight-loss and General Surgeon with advanced training in minimally invasive surgery with over 16 years clinical experience. He is also a Surgical Trainer for the Royal Australasian College of Surgeons.

Dr Andrew Kiyingi was schooled in Sydney, graduated from the University of Otago (NZ) and was awarded the University Gold Medal in General Practice and Distinction in Surgery. He completed surgical training at St Vincents Hospital Melbourne and was awarded Fellowship (FRACS) under the Royal Australian College of Surgeons.