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បានធ្វើបច្ចុប្បន្នភាពចុងក្រោយ៖ ខែ​ឧសភា 3, 2026

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Welcome to a journey through the history and science of one of the most transformative technologies in modern urology: អ៊ីស្កាបស្តូលីស្ហូវេដឌ័រអេដត្រូបស្កីឌី (អេស។ អេ។ អិល។ អិល). As a board-certified urologist specializing in kidney stone treatment, I want to share with you how a wartime observation evolved into one of the most elegant non-invasive procedures we offer today.

This article is drawn from my official presentation delivered at the Royal Phnom Penh Urology Seminar on November 17, 2018. That seminar remains a meaningful milestone in my career — a moment where we connected the historical roots of medical innovation to the cutting-edge solutions I now provide to patients at Bangkok Hospital Headquarters and Samitivej Sriracha Hospital.

What Exactly is a Shockwave?

To understand how we break kidney stones without a single incision, we must first understand the physics of the “shockwave.” In scientific terms, a shockwave is a sharp change of pressure in a narrow region traveling through a medium such as air or water. These waves are typically caused by explosions or by bodies moving faster than the speed of sound.

In urology, we harness this energy and aim it with precision. Think of it like a focused beam of sound energy: much like a magnifying glass focuses sunlight onto a single point to create heat, an ESWL machine focuses shockwaves onto a kidney stone to create mechanical stress, eventually shattering the stone into “dust” or small fragments that can be passed naturally in the urine.

A Surprising History: From Battlefields to Hospitals

The history of ESWL is a classic example of dual-use technology — where a discovery in one field changes another entirely.

• The World War II Connection: During WWII, it was observed that sailors and soldiers in the vicinity of underwater depth charge explosions suffered severe lung injuries — even when they had no visible external wounds. This proved that shockwaves could travel through water and the human body to affect internal structures.
• The Breakthrough (1980): Decades of research into high-energy physics eventually led to a medical breakthrough. On February 7, 1980, the very first human treatment using a first-generation Extracorporeal Shockwave Lithotripter was performed in Germany. This single event changed urology forever, transforming what used to be major open surgeries into non-invasive procedures.

The Four Generations of ESWL: A Path to Perfection

The technology has evolved rapidly since 1980. Each generation of machines has aimed to make the treatment safer, more comfortable, and more accurate.

1. The First Generation: The “Water Bath” Era

The early machines were massive. To work, the patient had to be submerged in a large tub of water to allow the shockwaves to travel from the generator into the body. The downsides were significant: these machines were incredibly expensive and huge, the focal zone (the area where the energy hits) was wide and therefore less precise, patients required general anesthesia, and they typically required hospitalization.

2. The Second Generation: The “Dry” Patient

Engineers replaced the giant water tub with a small water-filled cushion or “bellows” pressed against the patient’s skin. The patient stayed dry, and the focal zone became tighter and more accurate. Some treatments could be done under local anesthesia — but the machines remained large and still required significant radiation exposure for stone targeting.

3. The Third Generation: Compact Efficiency

These machines became much smaller and more mobile. However, they still relied heavily on X-ray (fluoroscopy) for targeting, meaning patients were exposed to radiation. Furthermore, the patient’s breathing caused the kidney stone to move up and down with each respiration, making it difficult to maintain a 100% “hit rate” on the stone.

4. The Fourth Generation: The Current Standard

This represents the technology we utilize today — a pinnacle of precision and patient safety. The improvements are remarkable:

• Auto Stone Localization: The machine finds the stone automatically.
• Zero Radiation Exposure: By using advanced ultrasound instead of X-rays, we can see the stone without exposing the patient to radiation.
• Respiratory Tracking: The “holy grail.” The ultrasound system tracks the stone as it moves with the patient’s breath, ensuring the shockwave hits the target consistently throughout the session.
• No Anesthesia Required: Most patients can undergo this treatment without even a painkiller, returning home the same day.

What Determines Success?

While our 4th-generation technology is highly efficient, the success rate of breaking a stone depends on three critical factors:

Factor	ការពិពណ៌នា
Stone Hardness	Not all stones are created equal. We use CT scans to measure the “Hounsfield Units” (density) of a stone. The harder the stone, the more shockwaves it may require to fragment.
Stone Location	Stones in the kidney or upper ureter generally have higher success rates than those in the very bottom of the kidney (the lower pole), where gravity makes it harder for fragments to wash out naturally.
Stone Size	Stones under 10 mm have the highest success rates (often 85–90% or more). As the stone grows larger than 10 mm, the success rate for a single session may decrease, sometimes requiring a second treatment.

Final Thoughts

The evolution of ESWL — from a wartime observation to a 4th-generation “robotic” tracking system — is a testament to the power of medical innovation. My presentation in 2018 at Royal Phnom Penh Hospital was, in many ways, a celebration of this progress. Today, we are proud to offer a treatment that is non-invasive, radiation-free, and highly effective — allowing our patients to return to their lives faster than ever before.

If you are dealing with kidney stones and would like to discuss whether ESWL is the right treatment option for you, Dr. Soarawee Weerasopone offers specialist consultations in kidney stone treatment at Bangkok Hospital Headquarters. កក់ការពិគ្រោះយោបល់.

Frequently Asked Questions About ESWL

What is ESWL and how does it break kidney stones?

ESWL (Extracorporeal Shockwave Lithotripsy) uses focused shockwaves generated outside the body to break kidney stones into small fragments. The shockwaves pass through the skin and tissue, concentrating their energy on the stone to fracture it into pieces small enough to be passed naturally in the urine.

Is ESWL painful or does it require anesthesia?

With modern 4th-generation ESWL machines, most patients can undergo treatment without anesthesia or even painkillers. The procedure is non-invasive and well tolerated, allowing patients to return home the same day.

What size of kidney stone is best treated with ESWL?

Stones under 10 mm have the highest success rates with ESWL — often 85–90% or higher in a single session. Stones larger than 10 mm may still respond to ESWL but sometimes require a second treatment session for complete clearance.

Does modern ESWL still use X-ray radiation?

Fourth-generation ESWL machines use advanced ultrasound for stone localization, eliminating the need for X-ray radiation during the procedure. This makes the treatment safer for patients, especially those who may need repeat sessions.

What factors affect the success rate of ESWL?

Three main factors determine ESWL success: stone hardness (measured in Hounsfield Units on CT scan), stone location (upper kidney and ureter respond better than lower pole stones), and stone size (smaller stones have higher success rates).

Disclaimer: This content is medically written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any medical treatment.