When Mr Goh Boon Seong reached his mid-40s, he decided he wanted to do something meaningful to give back to society.

He decided to relinquish his corporate development directorship at Singapore Technologies Group to build an enterprise in the healthcare industry.

The result of Mr Goh's midlife change was WhiteRock Medical Company (WMC), of which he is president and chief executive.

"There were huge unmet medical needs in the rehabilitation and respiratory markets," recounted Mr Goh, now 61.

"For example, in the rehabilitation area, stroke patients who are discharged after staying up to six weeks in the hospital often receive little outpatient treatment or care which results in greater difficulty in regaining mobility."

Another niche area was the respiratory market, he said.

"While sleep apnea, a potentially fatal breathing disorder during sleep, is a persistent bugbear in Europe and the United States, it is much less known in Asia as most mistake it for snoring."

He added: "These are the niches we identified as a small company as we did not want to fight with the big boys and we focus on technology and clinical solutions to deliver the long-term care to our customers."

Mr Goh runs a group of companies with complementary capabilities to address specialised needs and reach out to the rapidly greying population across the globe.

WMC innovates and develops healthcare products through its US-based wholly-owned unit, Somnetics Global (SG).

SG has developed a complete line of portable so-called "continuous positive airway pressure (CPAP)" devices that pressurise the airway, preventing collapse and allowing the continual flow of air for sleep apnea sufferers.

"CPAP is popular as it weighs less than one pound (450g), is quiet, and operable by either line electrical power or by small, portable, rechargeable batteries, unlike the other products in the market."

Out of WMC's total revenue of $43 million in 2014, CPAP raked in sales worth $6.5 million in 20 countries including the US, Britain and China.

WMC also acquires exclusive marketing rights to distribute its rehabilitation and sports medicine devices and equipment to top hospitals and sports science institutes in South-east Asia and China via wholly-owned unit, United BMEC, and 50 per cent-owned associate, Pukang, respectively.

Still, staying relevant and sustainable is a challenge in the healthcare sector.

In the old days, patients relied on doctors' recommendations.

But now, patients do their own research, obtain different kinds of medical opinions and become active participants in healthcare decision making, he said.

As a result, "healthcare is moving towards a patient-centric model, whereby the healthcare delivery model is rapidly shifting from one that is largely fragmented, into one that is more integrated, with greater coordination among caregivers", Mr Goh added.

In the past, patients focused on receiving inpatient care only at acute hospitals.

Nowadays, they see healthcare on a continuum, such as getting rehabilitative treatment in community hospitals and long-term home care in nursing homes.

For example, the standard of care for stroke patients includes a period of acute hospital care followed by a short period of inpatient rehabilitation and a series of outpatient rehabilitation sessions.

However, the outpatient rehabilitation period is generally just a few weeks. The lack of consistent rehabilitation thus impedes the recovery necessary for patients to achieve independence or a good quality of life.

In 2012, BMEC made inroads into the stroke rehabilitation market by acquiring exclusive marketing rights for most major Asian countries, such as China and Malaysia, to proprietary and transformational mobility technologies.

Take, for example, the Alter G, an anti-gravity treadmill that could "unweigh" patients down to 20 per cent of their body weight. A lighter body weight eases the physical effort needed for stroke patients to relearn walking and hence accelerates recovery of their physiological functions.

To maximise the uses of the technologically advanced equipment, BMEC has recently added clinicians to its full-time staff to develop the service protocol and provide adequate training to the hospital and rehabilitation facility staff.

The different strategies have worked out well for Mr Goh and his longstanding investors. CPAP, the sole product line of its respiratory business, was introduced in the fourth quarter of 2011 and sales achieved a compound annual growth rate of 115.2 per cent in the years to 2014.

This strong growth, coupled with healthy sales of its long-established rehabilitation products and services meant WMC's revenue grew by 10 per cent from 2013 to last year. Mr Goh is confident revenue growth will be even stronger this year.