Local trampoline park Ryze has vowed to step up safety measures and investigate a collision between two teenagers that left one sustaining serious head injuries.

Police said the incident involving the pair, aged 14 and 17, happened at the premises on Java Road in Quarry Bay on Tuesday afternoon.

The 17-year-old, who was hit on his head, was sent to Eastern Hospital and remains in intensive care as of Wednesday, while the younger teenager suffered a collarbone injury.

Ryze said in a statement on Wednesday that two of its guests had "accidentally collided" while jumping on the same trampoline.

"We are currently conducting a thorough investigation to determine the exact sequence of events leading up to the collision. Our heartfelt thoughts are with both guests, and we are hoping for their swift and complete recovery," its spokesperson said.

"As we delve deeper into this incident, we are committed to continuously improving our protocols and implementing enhanced safety measures to minimise injuries."

Gabriel, a 13-year-old who visited the indoor trampoline park a day after the incident, said he was not concerned about his safety.

"There's a board that tells you you can't do certain stuff," he told RTHK. "If you are like a good person, you would [follow the guidelines], but then it doesn't apply to everyone."

DAB lawmaker Leung Hei, for his part, said trampoline parks should be required to brief all of their guests on safety measures, and make sure that each trampoline only has one person at any one time.

The latest incident renewed concerns over the need for the government to regulate the city's trampoline venues.

According to a Legislative Council discussion back in 2016, the then-home affairs secretary, Lau Kong-wah, said there was no licensing or regulating requirement specifically for trampolining activities.

However, he noted that if a trampoline park's mode of operation involved "entertainment as defined in the Places of Public Entertainment Ordinance, its operator must apply for a Places of Public Entertainment (PPE) licence.

“Whether regulatory or licensing regime should be set up for a specific sporting or entertainment activity involves a number of considerations. There should be careful evaluation on social needs and the pros and cons before any conclusion could be made by the government,” he said at the time.