Sri Lanka opener Dimuth Karunaratne was hit by a bouncing delivery on his helmet and was taken off the field at Manuka Oval on a stretcher on the second day of the Test match against Australia.Karunaratne crumpled to the ground after ducking into a Pat Cummins bouncer which rocketed into the back of his helmet after tea on the second day Saturday.The 30-year-old Karunaratne, who retired hurt on 46, left the ground on a motorized stretcher. He was later shown on television being taken by ambulance to a hospital.He appeared to be conscious, although medical staff appeared concerned about his neck.Cricket Australia later released a statement saying, Dimuth Karunaratne is in ‘good spirits’ and is doing fine, as confirmed by Sri Lanka coach Chandika Hathurusingha.”He’s in the hospital at the moment and in good spirits. No danger at the moment. He was talking to us before he was leaving as well,” Hathurusingha said after play.”It was a bit scary at the start the way he fall back initially but he was OK.”Throughout he was talking to the umpires and the physio. Hit on the back of the neck so he’s being assessed at the moment.”UPDATE: Dimuth Karunaratne is in ‘good spirits’ after a scary moment on day two: https://t.co/Xhc2Xk6vGe #AUSvSL pic.twitter.com/OvHfuiXRA4cricket.com.au (@cricketcomau) February 2, 2019Karunaratne’s departure led to a flurry of wickets for the Aussies as Nathan Lyon, Pat Cummins and Mitchell Starc struck in quick succession.advertisementLyon snared a well-set Lahiru Thirimanne for 41 while Cummins castled Kusal Mendis with a superb delivery for 6. Captain Dinesh Chandimal offered some resistance before getting out to Starc for 15.Sri Lanka ended the day’s play at 123 for 3 at stumps and trail Australia by 411 runs, with Kusal Perera unbeaten on 11 and Dhananjaya de Silva on one.That’s stumps! Late wickets have Australia right on top at Manuka Oval: https://t.co/DT74duc43l #AUSvSL pic.twitter.com/DNIgCzKDyMcricket.com.au (@cricketcomau) February 2, 2019Earlier, two-Test old Kurtis Patterson notched his maiden century to drive Australia to a massive first innings total of 534-5 declared on day two.The hosts, who lead 1-0 lead after winning the first test by an innings and 40 runs at Brisbane last week, may have done enough to bat Sri Lanka out of the match and seal their first series win since a 4-0 Ashes victory against England last year.After resuming on 384-4 Australia declared their first innings closed after lunch, with Patterson, in just his second Test innings, unbeaten on 114 and captain Tim Paine 45 not out.The home side have struggled with the bat recently, Usman Khawaja’s 141 against Pakistan last October the only hundred by an Australian batsman since they thrashed England at home, but they have three centurions in Canberra already.After hundreds from Joe Burns and Travis Head on the first day, the 25-year-old Patterson, who made his debut in Brisbane, looked untroubled against a second-string Sri Lanka attack that has lost three pace bowlers to injuries.