A $4.6 million bus to promote organ donations includes hi-tech computer games and audio-visual displays - but visitors to it cannot sign up as potential donors. Health chiefs came under fire yesterday for failing to furnish the Donormobile with a sign-up point for the Hong Kong Medical Association's computer register of donors. One of the register's founders said the Department of Health's preferred mode of donor promotion - carrying cards - was outdated, compounding the plight of thousands of patients desperate for transplants. Dr So Kai-ming, honorary secretary of the Organ Donation Register Fund, said there was a lack of co-ordination between the card and computer systems. 'Now we have the register it's better to co-ordinate efforts,' he said. 'Their system of cards is outdated. $4.6 million is a lot of money, I'm disappointed.' Dr So said a similar mobile education centre promoting the computer register had an annual running cost of $200,000. At the launch of the Donormobile, Sophie Leung Lau Yau-fan, chairman of the Human Organ Transplant Board, said there had been a 2.5-fold increase in donors since 1995. However, such an increase has only been in cornea transplants. Kidney transplants totalled 58 last year, compared to 44 the previous year. Only 12 liver transplants were carried out in each of the past two years. Three heart transplants were performed last year, down from four in 1995. Transplant waiting lists have not improved. About 900 people are waiting for kidneys, 100 for livers and 20 for heart transplants. Mrs Leung pointed to 'more than 170,000 registrations' recorded by the Medical Association. However, the association has only 28,000 names on its register. Director of Health Dr Margaret Chan Fung Fu-chan said the donor system had been a success. She said: 'It's working and we are moving in a good way. We hope to see more.' But Dr So said: 'It's time we considered what other approach we should take.' One possibility is the opt-out system favoured by countries such as Singapore, where organs are automatically used for transplantation unless an objection is made. Dr So said Hong Kong might not be ready for such a scheme, but added: 'It's not as draconian as people think.'