Came to REWIND to get my facial treatment and i'm absolutely obsessed about it💞 the doctor is so kind and is an expert! Everyone must visit!
Non-Surgical · Focused Ultrasound · Device Checks
What a patient can see, read and ask for before the first line
Gangnam, Seoul | Board-certified plastic surgeon, Dr. Jonghwan Choi
KHIDI-registered for international patients · Apgujeong Rewind
HIFU genuine cartridge check
The short answer
Look at three things before the first line is placed: the label on the transducer itself, the transducer panel on the device screen, and the documentation for the unit in the room. On Ultherapy Prime, the only focused-ultrasound device at Rewind Plastic Surgery, the manufacturer's instructions describe a label carrying the transducer type, a unique serial number, a part number, the date of manufacture and an expiry date, plus a screen panel showing how many lines the transducer has left out of its total capacity. A cartridge you can read on both counts is a cartridge you can check.
Sources: the instructions for use that Merz Aesthetics publishes for Ultherapy Prime (US edition) and Rewind's own device documentation. This page describes checks on one device and makes no statement about any provider.
Cartridge is the word most patients use. The manufacturer calls the part a transducer: the head that slides into the handpiece, holds the focusing element and fixes the depth at which the energy lands. It is also the part that gets used up, so most questions about genuine HIFU turn out to be questions about this one component.
This page is narrower than the overview. It stays with a single task: what you can verify for yourself at a focused-ultrasound appointment, what only the machine can verify, and what to ask when an item on the list is missing. Background on the platform itself sits on the Ultherapy Prime page.
Where to look
None of these needs technical knowledge. Each can be seen from the treatment chair or on the way in, and each belongs to the device Rewind actually treats with.
Reading the transducer
The manufacturer's instructions for Ultherapy Prime set out what the label and the screen display. The four points below follow that document. A unit in Korea may lay the screen out a little differently, so ask the operator to point to each item as you go.
The transducer name (DeepSEE on this platform), a type code such as DS 7-3.0 that gives the frequency in megahertz and the focal depth in millimetres, a unique serial number, a part number and the date of manufacture. A label you can read in full is the first thing to ask for.
Each transducer holds a fixed number of treatment lines. The screen places the lines still available beside that total, so a transducer near the end of its life shows up before your plan begins.
Once the remaining count reaches zero, the system halts and displays a message asking for the transducer to be replaced. A change of transducer during a session is therefore an ordinary event, and the replacement should show its own label and its own count.
The manual tells operators to check the expiry date before use, never to use an expired transducer, and to keep new transducers in their sealed pouches until needed. An opened pouch tells you the part is new; the date on the label tells you it is still current.

Why here
A patient who knows what to look at asks sharper questions, and a clinic running a single focused-ultrasound platform can explain every item on the list without qualification.
Focused ultrasound at Rewind runs only on Ultherapy Prime. The plaque, label and screen described here make up the whole list for this clinic; no second ultrasound system with different paperwork sits beside it.
Dr. Jonghwan Choi, a board-certified plastic surgeon, examines the face and then sets the plan size and depths. With the number agreed in advance, the running tally on screen becomes something you can follow line by line.
Max Wave works with microwave energy; Thermage FLX and Volnewmer use radiofrequency. Each has its own hardware. Rewind names the device and its energy on every plan, so the check you carry out matches the treatment you booked.
In the treatment room

Fig. 04 · The Ultherapy Prime unit by Merz Aesthetics (manufacturer image)

Fig. 05 · A private lounge room on the clinic floors
Rewind is on the fourth and fifth floors of the Richro Building in Apgujeong, Gangnam, Seoul. The plaque can be seen on arrival. The examination comes next, where Dr. Choi confirms that focused ultrasound suits the concern and writes the plan in lines. In the device room, before the first line, is the moment to look at the transducer label and the screen panel; once treatment starts, the running count keeps pace with the session.
Anaesthesia and session length are not published for Ultherapy Prime at Rewind, so raise both when you book. The manufacturer's manual also describes the device keeping an encrypted log of each session's parameters, which only the manufacturer's safety staff can open when a reported adverse event is being investigated.
Ultherapy® Prime · Genuine-device clinic plaque
Photographed as it hangs at Rewind. Set the name on the plaque beside the console you are treated on and the device printed on your plan; all three should agree.
Pricing
Rewind publishes two Ultherapy Prime plans. Each figure is tied to a line count, and the line count is exactly what the screen lets you verify. Price and check therefore work together: the number of lines you pay for is the number you can watch being delivered.
Listed prices exclude VAT. Where anaesthesia is used, its fee already sits inside the listed figure. A plan pairing Ultherapy Prime with a second lifting device is priced once the doctor has examined the face.
Suitability
A verified transducer settles which part is in use. Whether focused ultrasound should be used at all is a separate judgement, and Dr. Choi declines it when the examination says no.
Recovery
Checking the hardware changes nothing about recovery. Rewind gives the same brief instructions after every device-lifting session.
Genuine hardware leaves the recognised effects of focused ultrasound in place: redness, swelling, bruising and tenderness, with numbness, altered sensation and nerve irritation reported less often. A 2017 case series and literature review catalogues these complications. List every injection, thread and device session the area has had, so the doctor can weigh them before choosing depths.
Every Ultherapy Prime plan at Rewind is written by one board-certified plastic surgeon, who also sees the patient at follow-up and can account for the line count on the day it was delivered.
Rewind,
Rewind's Doctor
Dr. Jonghwan Choi Medical Director
The plan, the count and the follow-up
come from the same doctor.
A board-certified plastic surgeon focused on anti-aging lifting, whose craniofacial background shapes how tissue layers and treatment depths are read.
Questions
Google Reviews
Came to REWIND to get my facial treatment and i'm absolutely obsessed about it💞 the doctor is so kind and is an expert! Everyone must visit!
There are just way too many cosmetic clinics in Korea and I'm so happy I found Rewind Clinic in Gangnam. Dr. Choi was so kind and patient while explaining the different face-lifting options, from threads to mini-lifts to deep-plane lifts…
I found Rewind clinic through a Korean chat forum and many local clients highly recommended it. The clinic is brand new, featuring large, clean rooms and many private waiting areas so it doesn't give off that "factory" clinic vibe. All the…
Really nice environment. Doctor is easy to communicate and understands my visions. Waited two weeks to make a review and I confirm the results exceeded my expectations and I am super happy with it. Can't wait to come back!! :))
I received a thread lift at Rewind Plastic Surgery. The clinic was clean and the atmosphere was comfortable. The consultation was thorough, and I felt confident because they kindly explained everything tailored to my facial condition. They…
Reservation
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Scientific evidence
None of these papers studies whether a transducer is genuine. They are listed for what correctly delivered focused ultrasound has been measured to do, including in Asian patients, how its effect on skin compares with radiofrequency, and what has gone wrong in reported cases. None was carried out at Rewind, and none predicts an individual result.