Washing Machine for Blood: The Kolff Artificial Kidney
Willem Kolff’s Artificial Kidney: A Wartime Innovation That Revolutionized Medicine
Table of Contents
- Willem Kolff’s Artificial Kidney: A Wartime Innovation That Revolutionized Medicine
- Ethical Considerations and Early Challenges
- The Science of Blood Cleaning
- success After Repeated Attempts
- A Do-It-Yourself Approach
- The Key: A Sausage Casing Membrane
- A Washing Machine-Like Process
- Global Impact
- A Foundation for Artificial Organs
- Progress or “Frankenstein”?
- Timeline of Dialysis Development
- Willem Kolff’s Artificial Kidney: Revolutionizing medicine During Wartime
- Key Questions and answers About Willem kolff’s Artificial Kidney
- What was Willem Kolff’s artificial kidney?
- Why was Willem Kolff’s artificial kidney invented?
- What materials were used to build the first artificial kidney?
- What made Kolff’s artificial kidney work?
- How did the artificial kidney work?
- When was the first successful dialysis using the artificial kidney?
- What was the impact of Kolff’s invention?
- Did Willem Kolff work on other artificial organs?
- What ethical questions does the artificial kidney raise?
- How was the invention received?
- A Timeline of Dialysis Development
LEIDEN, Netherlands – In a dimly lit room at the Rijksmuseum Boerhaave, a museum dedicated to the history of science and medicine, resides a pivotal artifact: the first artificial kidney. This invention by Dutch physician Willem Kolff in 1943 marked a turning point in the treatment of kidney failure and the broader field of artificial organs.
Ethical Considerations and Early Challenges
Bart Grob, a curator at the museum, explained that the artificial kidney is deliberately positioned between exhibits on medical ethics and medical inventions. “An invention like this raises ethical questions,” Grob said. “Fifteen patients treated with the device did not survive. Was it justifiable to continue the experiments?”
Kolff, facing limited options during wartime, believed the experimental treatment was justified as the only choice for patients with kidney failure was certain death. He continued his work, driven by a commitment to saving lives.
The Science of Blood Cleaning
The principle behind dialysis, using a membrane to clean fluids, was established before Kolff’s work. Scottish chemist Thomas Graham discovered the process in 1861, noting that when two liquids are separated by a semi-permeable membrane, molecules can transfer between them.
By the 1930s, animal experiments demonstrated the potential of this process for blood purification. Waste molecules could be removed from the blood of dogs while retaining larger molecules like red blood cells and proteins. Kolff began developing his dialysis machine just before World War II.
success After Repeated Attempts
After 15 unsuccessful treatments and one patient who recovered spontaneously, Kolff’s artificial kidney achieved its first success in 1945. A woman, known as ”Patient 17,” suffering from acute kidney disease, was saved by the device.
An 11.5-hour dialysis session filtered toxins from her blood, allowing her kidneys time to recover. She became the first person in the world to survive such a condition thanks to artificial dialysis. “Remarkably, Kolff’s first successful patient was a member of the NSB,” Grob noted, referring to the Dutch National Socialist Movement, “while Kolff himself was active in the resistance.”
Kolff built his artificial kidney in secrecy during the German occupation to prevent the technology from falling into enemy hands. “He didn’t want them to get hold of it,” Grob said.
“You can restore the artificial kidney to new condition, but the traces of use tell the story.”
Bart Grob, Curator, Rijksmuseum Boerhaave
The device, now on display, bears the marks of its history. ”You could restore the artificial kidney to new condition, but the traces of use tell a story,” Grob explained. “You can imagine how it was used in a hospital room during the final years of the war.”
The artificial kidney’s construction reflects the resourcefulness required during wartime. Its success seems almost like a blessed byproduct of necessity.
A Do-It-Yourself Approach
Kolff’s dialyzer, as he called the artificial kidney, was assembled from repurposed materials. A wooden drum rotated inside an aluminum bin made from salvaged aircraft parts. A bicycle chain connected the drum to a second-hand sewing machine motor. The frame supporting the device came from a local tile factory, and a water pump from an old Ford Model T ensured it was watertight.

The Key: A Sausage Casing Membrane
“The most challenging thing was to find a suitable material to lead the blood through,” Grob said.”It had to be thin enough to act as a membrane, allowing the flushing fluid to filter out waste, but also thick enough to contain the blood.”
Kolff initially used American cellophane, but it became unavailable during the war. He discovered that cellophane sheets used to wrap German sausage were an ideal substitute. He wound the material 30 times around the drum, creating a thin filter for the blood to pass through.
A Washing Machine-Like Process
“A patient received two infusions and was connected to the front and back of the artificial kidney with rubber hoses,” Grob explained, pointing to two nozzles on the drum.
The patient’s blood flowed through the sausage casing, and the rotating drum moved through a container of rinsing fluid. This process filtered waste from the blood. “The drum really turned through the container like a washing machine,” Grob said. ”This created a lot of foam, and the coil fluid spilled over the edges. The nurses who worked with the Kolff machine were the only ones in the hospital allowed to wear clogs to avoid getting their shoes wet.”
Global Impact
After the war and the first successful dialysis, Kolff shared his invention with the world. “He had already built three other artificial kidneys and sent them to colleagues abroad,” Grob said. Two of the original four devices survive today. one is in storage, and the other is on display at the Rijksmuseum Boerhaave. A working replica is located at the hospital in Kampen, where kolff’s work began.
A Foundation for Artificial Organs
“The Kolff artificial kidney was more than just the beginning of contemporary dialysis,” Grob said. “It was the first presentation that a machine could replace an organ.” This breakthrough paved the way for the advancement of other artificial organs.
“The Kolff artificial kidney was more than just the beginning of contemporary dialysis.”
Bart grob, Curator, Rijksmuseum Boerhaave
Kolff later developed a heart-lung machine using similar techniques. In 1982, his team performed the world’s first artificial heart transplant. Grob pointed to an artificial heart displayed near the kidney, calling it “an ethical dilemma.”

The Jarvik-7 artificial heart was implanted in Barney Clark, who lived for 112 days with the device before succumbing to complications.
Progress or “Frankenstein”?
“When this transplant became public, the media called it a ’Frankenstein’ peril,” Grob said. Kolff, however, continued his work undeterred until his death in 2005.
“When I met him at the museum in the late 1990s, I saw a man with an incredible drive to help people,” Grob recalled. That drive is evident in the do-it-yourself artificial kidney, built during wartime with limited resources but fueled by Kolff’s unwavering commitment to his patients.
Timeline of Dialysis Development
- 1938: Willem Kolff begins researching kidney function replacement treatments after a 22-year-old patient dies from a kidney infection.
- [1945:[1945: Kolff builds the first functional dialysis machine. The first patient survives after treatment.
- 1952: Paul Teschahan introduces acute dialysis for soldiers with severe wounds during the Korean War.
- 1954: The first kidney transplant takes place. dialysis remains vital for many patients.
- 1962: Development of a permanent bloodstream access point (shunt) enables repeated dialysis treatments.
- 2025 (Projected): Portable artificial kidneys are under development, allowing patients to undergo dialysis at home and while traveling.
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Willem Kolff’s Artificial Kidney: Revolutionizing medicine During Wartime
This article explores the groundbreaking invention of the artificial kidney by Willem Kolff, its impact on medical history, and the challenges faced during its advancement.
Key Questions and answers About Willem kolff’s Artificial Kidney
What was Willem Kolff’s artificial kidney?
Willem kolff’s artificial kidney was the first functional dialysis machine, created in 1943 during World War II. It was designed to filter toxins from the blood of patients with kidney failure, effectively performing the function of the kidneys.
Why was Willem Kolff’s artificial kidney invented?
Kolff developed the artificial kidney because there was no treatment for kidney failure. Facing the limited options, he was driven to save lives. His work was spurred initially after a patient died from a kidney infection.
What materials were used to build the first artificial kidney?
Due to resource limitations during wartime, Kolff’s artificial kidney, or dialyzer, was built using repurposed materials. It included a wooden drum (rotating inside an aluminum bin from salvaged aircraft parts), a bicycle chain (connected to a sewing machine motor), a frame from a tile factory, and a water pump from an old Ford Model T.
What made Kolff’s artificial kidney work?
The key to Kolff’s invention was the membrane used to filter the blood. He initially used cellophane, later discovering that cellophane sheets used to wrap German sausages worked as an ideal substitute.He wound the sausage casing around the drum to filter waste and toxins from the blood.
How did the artificial kidney work?
The patient’s blood flowed through the sausage casing membrane, which was rotated in a container of rinsing fluid. This “washing machine-like process” filtered waste from the blood, allowing the patient’s blood to be cleaned.
When was the first successful dialysis using the artificial kidney?
The first successful dialysis treatment using Willem Kolff’s artificial kidney was in 1945. A woman known as “Patient 17” who was suffering from acute kidney disease survived the treatment.
What was the impact of Kolff’s invention?
Kolff’s artificial kidney was a landmark achievement. It was more than the beginning of contemporary dialysis since his mechanical kidney showed that a machine could take over for a failing organ, which spurred advances in other artificial organs, including the heart and lungs.
Did Willem Kolff work on other artificial organs?
Yes, Kolff later developed a heart-lung machine and, in 1982, his team performed the world’s first artificial heart transplant using the Jarvik-7 artificial heart.
What ethical questions does the artificial kidney raise?
As the first experiments showed, the artificial kidney’s emergence brought up many ethical questions. because the treatment was not successful at first, the question arose whether it was justifiable to continue with the experimentation.
How was the invention received?
Initially, the media had mixed reactions and the public called the Jarvik-7 artificial heart a “Frankenstein peril”. Kolff continued his work undeterred, despite the challenges.
A Timeline of Dialysis Development
- 1938: Willem Kolff begins researching kidney function replacement treatments.
- [1945:[1945: Kolff builds the first functional dialysis machine. The first patient survives after treatment.
- 1952: Paul Teschahan introduces acute dialysis for soldiers with severe wounds during the Korean War.
- 1954: The first kidney transplant takes place. Dialysis remains vital for many patients.
- 1962: Development of a permanent bloodstream access point (shunt) enables repeated dialysis treatments.
- 2025 (Projected): Portable artificial kidneys are under development, allowing patients to undergo dialysis at home and while traveling.
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