Initiate ipdb from Vim in another ConEmu Tab

It's enough to do simply

:silent !start python -m ipdb

Also read :h :!start

Well, that was not exactly what I asked for (although, it was not clearly stated in my question) - but it helped. It is opening layered window and I wanted to have side by side with my vim. But, hurray for me also, I managed with your hint to make it at last:

:silent !start cmd.exe /c -new_console:s python -m ipdb %

This command is opening new tab side by side with vim

Here is what I did in _vimrc:

"python with virtualenv support                                                                                        
let pipenv_venv_path = system('pipenv --venv')                                                                         
" The above system() call produces a non zero exit code whenever                                                       
" a proper virtual environment has not been found.                                                                     
if shell_error == 0                                                                                                    
  let venv_path = substitute(pipenv_venv_path, '\n', '', '')                                                           
  let py_binary = venv_path . '/Scripts/python.exe'                                                                    
else                                                                                                                   
  let py_binary = 'python.exe'                                                                                         
endif                                                                                                                  

"map F10 to execute ipdb in separate split Tab in ConEmu:                                                              
nnoremap <silent> <expr> <F10> '<ESC>:w!<CR>:!start cmd.exe /c -new_console:s ' . expand(py_binary)  . ' -m ipdb %<CR>'

Thanks for your help!