One-year-old Elisabeth Ellis wrapped up her second round of chemotherapy in the fight against a rare brain tumor last week. While the family is enjoying time at home before they have to return to the hospital, her dad is patenting a “Comfort Cart” for pediatric patients.

“The second round was a lot better,” said Cardon Ellis, who first shared his daughter’s story with KHTS in February. “We were able to pre-medicate her for her chemotherapy drugs, and we kind of figured out a lot of what she reacts to and doesn’t react to.”

Baby Elisabeth with her parents, Cardon and Brittany Ellis.

Ellis noted that a big part of baby Elisabeth’s recent improvement is actually due to their participation in a pediatric medical marijuana research study through CannaKids, which is not associated with Children’s Hospital Los Angeles.

Related: Baby Fighting Rare Brain Tumor Gets To Spend Week At Home, Starts Second Round Of Chemo (VIDEO)

“It has made a huge difference,” Ellis said. “She doesn’t throw up as much, she sleeps more, she’s got the munchies so she’s able to eat on occasion — it’s a huge improvement.”

In combination with anti-seizure medication, the medical cannabis has also helped stave off seizures, which Elisabeth suffered at the beginning of her second round of chemo.

During his efforts to keep his daughter as comfortable as possible, Ellis stumbled upon what could be a highly successful invention he could potentially support his family with, the chemo “Comfort Cart.”

Elisabeth in the “Comfort Cart” invented by her dad.

What started out as a wagon with a rolling IV post attached by a belt has become a patent-pending Comfort Cart complete with a portable battery for an iPad to play music or videos, a cushioned liner and a special attachment to connect the IV post to the back of the cart.

Related: Santa Clarita Dad Shares Heartbreaking Story As One-Year-Old Daughter Battles Rare Brain Tumor (VIDEO)

“I actually had so many doctors come up in the hospital saying, ‘Oh hey, this is amazing — where did you get it?,’” Ellis explained. “I invented it… I have a team of people that are going to help me out. It’s getting the full utility patent — the whole nine yards.”

Not only does the cart help soothe Elisabeth by allowing her parents to wheel her down the hallways of Children’s Hospital L.A., it also eliminates the need for the assistance of a nurse when she leaves her room, keeping the family more mobile.

When Ellis and his wife, Brittany, aren’t wheeling baby Elisabeth around the hospital in her Comfort Cart or spending time with her during or between treatments, the family had the chance to meet celebrities like Demi Lovato and the actors from the latest “Power Rangers” movie.

“The Children’s Hospital L.A. Foundation actually does a really, really good job of trying to make the best of a really crappy situation,” Ellis said. “If there’s a movie premiere, they’ll ask actors to come, and most of the actors are actually really excited to do it.”

Elisabeth with her favorite CHLA nurse, Adam.

Demi Lovato, the voice of Smurfette in “Smurfs: The Lost Village,” handed out a signed movie poster, which is now hanging above Elisabeth’s hospital bed, while the cast of “Power Rangers” stopped by for a movie screening.

“She’s not old enough to understand the significance of the celebrity-ness of it all,” Ellis said. “When the Power Rangers came she didn’t really pay attention to any of the actors, but she was like enamored playing peek-a-boo with the woman that was in charge of PR for Lionsgate.”

While things seem to be looking up for baby Elisabeth at the moment, Ellis noted that her final three rounds of chemotherapy are expected to be the worst because they’re double the dose.

“They virtually poison her to death,” he said. “They can save her with her own stem cells later… The kids are bedridden for 90 days straight. It’s called bone marrow transplant. There’s no going home.”

The Santa Clarita community has continued to rally around the Ellis family over the last few months, donating nearly $77,000 so far through a GoFundMe page and participating in fundraisers at local restaurants.

“Thoughts and prayers are always super helpful,” Ellis said. “We’ve seen a lot of support from people in the valley, and we really appreciate it.”

To support baby Elisabeth and the Ellis family, click here to donate to the GoFundMe page.

All photos and videos courtesy of Cardon Ellis.

Ed. Note: Children’s Hospital Los Angeles does not have a medical marijuana research study for oncology patients. The study referred to in this article is being conducted by CannaKids.