Israeli researchers say they have created the world's first three-dimensional ,or 3D-printed heart using a patient's own cells.

The researchers, from Tel Aviv University, recently announced the experiment and showed off the new 3D printed heart. Their findings were published in the journal Advanced Science. They described the experiment as "a major medical breakthrough."

The lead researcher on the project was university professor Tal Dvir. He said in a statement that it was the first time that human cells had been used with 3D printing technology to successfully create a whole heart. Dvir added that the "printed" heart contains blood vessels which are needed to pump blood.

Until recently, scientists working on medical methods combining biology and technology were only successful in 3D printing "simple tissues without blood vessels," the research team said.

The engineered heart introduced by the Israeli team was not big enough to be transplanted into a human. "At this stage, our 3D heart is small, the size of a rabbit's heart," Dvir explained. "But larger human hearts require the same technology."

The development marks a step forward for 3D printing in the medical field. The technology has already expanded into many industries and has been developed to produce devices like guns, cars and homes.

The researchers wrote that they took samples of fatty tissue from patients. This material was then used to develop "ink" for the 3D printing process. First, the researchers created patches of tissue from the patient's own cells. Later, they used that same process to create a small version of a whole heart.

Dvir says using the patient's own cells is important to reduce the risk that the body's system to fight infection will reject a transplanted organ.

The goal, the researchers said, is to treat heart disease. The World Health Organization reports that heart disease is by far the leading cause of death worldwide. For patients with severe heart disease, a heart transplant is currently the main treatment available. The researchers hope their invention can help ease the demand for heart transplant donors.

Dvir says that the newly-created heart represents great progress. However, more research and development is needed to produce a fully operating, transplantable organ. For example, he said the heart cells will need to fully form parts that can work together to effectively pump blood.

One of the biggest challenges for the engineering team will be finding a way to create a human-sized heart.

Dvir said his team plans to transplant heart models designed for animals, possibly within the next year. He added that, for human use, "simpler organs" will likely be produced before hearts.

"Maybe, in ten years, there will be organ printers in the finest hospitals around the world," Dvir said. He added that he hopes such methods will be used "routinely" to produce organs in the future.

In 2017, the Israeli health ministry formed a group to examine the issues related to the use of 3D printing technology in the medical field, Israel's newspaper Haaretz reported.

One of the group's members was Samer Srouji, who works at Galilee Medical Center in the coastal city of Nahariya. He told the newspaper that while 3D printing in medicine offers great promise, it can also present problems.

"There were also cases that ended up with complications, causing infection and harm to the patient," he said. "This area requires regulation, with protocols and clear guidelines in place," he added.

I'm Bryan Lynn.

Bryan Lynn wrote this story for VOA Learning English, based on reports from the Tel Aviv University, Agence France-Presse and Haaretz online. Mario Ritter was the editor.