A new weight-loss balloon that can be swallowed in a pill has been launched across the UK.

Unlike other gastric balloon treatments, Obalon does not require invasive surgery. Instead, in a 10-minute procedure, patients swallow a capsule the size of a large vitamin pill that contains a deflated balloon.

The capsule is attached to a micro-catheter and, once the capsule arrives in the stomach, the balloon is inflated to the size of an apple. The capsule dissolves and the catheter is removed via the mouth.

The balloon sits on top of the stomach, giving patients the sensation of being full with the hope they then eat less and lose weight.

Patients receive a second balloon 30 days after the first procedure, with the option of a third balloon after around 60 days, based on their weight loss and feelings of fullness.

Each balloon can stay in place for 12 weeks before it is removed. Therefore, at most, patients can have a 36-week treatment plan.

At the end of the treatment plan the balloons are deflated and removed during an outpatient endoscopy, where a thin, long, flexible tube is inserted into the throat without the need for general anaesthetic.

Obalon costs from £2,995 for a two-balloon treatment and avail;able at some private clinics.

The treatment is more short term than other gastric procedures and is recommended for people whose body mass index is 27 or over.

Clinical trials in the UK and in the US have shown that patients can lose an average of 7.7kg in 12 weeks.

One patient, Helene Fleckney, 43, from Shenley in Hertfordshire, said: "A history of heart disease and diabetes runs in my family, so I knew I had to take action with my weight gain to lower my risk of susceptibility, as well as improving my confidence.

"Obalon has proved an easy and quick treatment to help me lose weight. I'm not even fully through the treatment process yet and I've already lost a stone."

Spire clinics consultant Sally Norton said: "I've been monitoring Obalon's progress over the last few years as I was very excited about the potential it could offer those patients who do not qualify for weight loss surgery but are struggling to lose weight and improve their health on their own.

"It has minimal side effects, is quick and easy to place and is really well tolerated.

"It gives patients an initial weight-loss boost but also helps to change their eating behaviour that is needed for long-term weight loss."

Clinical trial results showed around 7% of patients had some side-effects including vomiting, cramps and reflux, which generally subsided in a day or two.