The Chiemsee Knee Replacement Clinic (CKRC) is a sports clinic located at the no
ID: 343062 • Letter: T
Question
The Chiemsee Knee Replacement Clinic (CKRC) is a sports clinic located at the northern edge of the German Alps. It specializes in knee replacements for skiers who come to CKRC from Germany, Austria, Switzerland, and Italy. The clinic currently has one operating room (OR). However, since the clinic has dramatically more demand than capacity, the management team contemplates investing in a second OR. A lean consulting firm, however, suggests that before going ahead with installing new capacity, the clinic should first look at how it uses its existing capacity. The data collected by the consulting firm reveal that:
-- The OR is available for 12 hours a day; the hospital has decided to not perform any procedures between 7pm and 7am. This time is equally divided across three surgeons.
--The standard procedure time for the knee surgery done at the clinic is 74 minutes.
-- The cleaning and housekeeping that needs to happen after each procedure takes 23 minutes. Almost all of this time could be saved if the cleaning crew were notified earlier on.
-- 10 minutes are spent on patient preparation /anesthesia work before each procedure. (Note: this is not part of the procedure time). Proposals have been evaluated to move these 10 minutes to outside the OR, and there exists no medical reason that would prohibit doing this.
-- A surgeon only starts a case if all of the work associated with the case (preparation, procedure, and cleaning) can be completed in the 4h allotted to each surgeon. Surgeons never start BEFORE their allotted time.
-- Though the clinic aims to operate 7 days a week, holidays, vacation, and construction time lead to an average of 1 days a week that the OR cannot be used at all.
What is the OEE of the operating room (in percentage and keep 2 decimal).? Assume a 12h window in which the OR could be used.
Explanation / Answer
OEE (overall equipment effectiveness) is the ratio between fully productive time vs planned production time. To solve this problem we need to figure out what could be the fully productive time after considering the consulting firm’s recommendations.
Considering that the consulting firm’s suggestions are implemented,
This allows each surgeon to perform the following number of operations
(4 x 60) / 74 = 3.24 or,
3 surgeries in 4 hour window.
This means daily the OR is actually utilized for 9 hours. In a week (considering 1 day off) the OR is used
9 x 6 hours = 54 hours
Planned usage of OR is 12 hours a day. In a week (hospital plans to use all 7 days) the OR is planned for
12 x 7 hours = 84 hours
OEE = productive time / planned productive time or,
OEE = 54 / 84
Converting it to percentage,
(54 / 84) x 100 = 64.28%