shares of medical device company tenon medical inc more than doubled to 223 as it withdrew plans for an equity offering wednesdays volume was more than 23 million shares compared with a 65day average of 38049 a week ago tenon said it was offering 444 million units containing stock and warrants with certain investors able to buy units including prefunded warrants in lieu of stock due to ownership limits tenon which focuses on sacroiliac joint pain developed the catamaran si joint fusion system