CHALLENGER CL604 FLT CREW HAS A TCAS RA ON APCH TO TEB.

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WE WERE ON VECTORS FROM THE JAIKE ARR TO THE TETERBORO VOR DME-A APCH AT 3000 FT HDG 090 DEGS WHEN ATC ISSUED A TA. A TARGET APPEARED INSIDE THE 5 MI RING; -500 FT AND SLIGHTLY R OF COURSE; APCHING. AS THE ALT AND DISTANCE DECREASED; TCAS ISSUED A TA. I TURNED THE HDG KNOB 3-5 DEGS L; RESTED MY THUMB ON THE AUTOPLT DISCONNECT BUTTON AND STARTED SCANNING OUTSIDE; WAITING FOR AN RA. ABOUT 5 SECONDS LATER; JUST BEFORE THE RA; THE CAPT TOOK THE CTLS AND BANKED L RAPIDLY. SIMULTANEOUSLY; I HEARD THE 'CLB; CLB; CLB' RA. THE CAPT PITCHED UP WHILE ROLLING WINGS LEVEL. I CHKED THE TCAS DISPLAY AND NOTED THE VSI RESOLUTION BAR WAS RED WITH ABOUT 1/2 INCH OF GREEN ON TOP. I ALSO NOTED TFC DISPLAYED AT -100 FT OFF THE R WING; BUT I DIDN'T ACQUIRE THE ACFT VISUALLY. THE CAPT RPTED RESPONDING TO AN RA; BUT I THINK HE MAY HAVE BEEN STEPPED ON. ALMOST IMMEDIATELY; THE TCAS CALLED 'CLR OF CONFLICT' AND THE CAPT TRANSITIONED TO A DSCNT BACK TO 3000 FT. ATC SAID SOMETHING AT THIS POINT AND THE CAPT RPTED THE RA AGAIN. DURING THE DSCNT I INFORMED THE CAPT THE FLT ATTENDANT HAD BEEN HURT. HE GAVE ME THE AIRPLANE AT 3000 FT; AUTOPLT ENGAGED; AND WENT TO CHK ON HER. I BELIEVE ATC ISSUED APCH CLRNC; CROSS CLIFO AT 2000 FT. I ACKNOWLEDGED A CLRNC TO CLIFO INTXN; 2000 FT AND HAD JUST FINISHED PROGRAMMING THE AUTOMATION WHEN THE CAPT RETURNED AND INFORMED ME THAT THE FLT ATTENDANT HAD BROKEN HER LEG. HE TOOK THE AIRPLANE FOR THE APCH. HE INSTRUCTED ME TO CALL FLT SUPPORT AND REQUEST AN AMBULANCE. NEAR THE FAF; WE WERE HANDED OFF TO TWR. IN THE TFC PATTERN; THE CAPT REQUESTED AN AMBULANCE FROM TWR AND LANDED THE ACFT UNEVENTFULLY. I CONFIRMED WE HAD AN INJURED CREW MEMBER TO THE GND CTLR AND HE CLRED US TO FBO. THE CAPT DIRECTED ME TO SEE TO THE FLT ATTENDANT AFTER THE PARKING BRAKE WAS SET AND TOOK THE CHKLIST FROM ME TO COMPLETE THE SHUTDOWN. I ACCOMPANIED HER TO THE HOSPITAL. I DO NOT THINK MY ASSESSMENT OF THE THREAT TO OUR FLT WAS THE SAME AS THE CAPT'S; BUT HE DID NOT INDICATE ANY DISCOMFORT BEFOREHAND. WHEN THE CAPT INITIATED THE ESCAPE MANEUVER; THINGS HAPPENED VERY RAPIDLY. I BELIEVE WE COMPLIED WITH ALL CLRNCS AND I KNOW THE CHKLISTS WERE COMPLETED UP TO THE POINT I LEFT MY SEAT AT SHUTDOWN. IT MAY HAVE BEEN PRUDENT TO DECLARE AN EMER AND DELAY THE APCH; BUT WITH OUR FLT ATTENDANT'S INJURY; ONE CAN ALSO APPRECIATE A SWIFT LNDG AT TETERBORO.