There is no set protocol for the leave (sick) however it is a discretionary right of the the company to approved the leave or not.But in your case it seems genuine as you are suffering from the spinal cord injury.So it is suggested to apply for the leave for the period you want with the doctor's certificate which justify the rest for the Particular period.i am sure the well cultured company never denied the leave in case of your medical exigencies.
Senior member kindly correct it.if found something wrong.
I am sorry for what has happened to you by way of some accident. In fact if such a serious injury was not caused by any employment accident, one can not expect anything from the employer other than compassion. Only the extent of your employer's compassion can decide how long you can be on leave on loss of pay on such genuine medical grounds. In such a precarious situation, law can not be of any help to you. If it is possible for you to work from home, you can request your employer to consider it so that he can supplement your total loss of earnings at least to some extent. Take the treatment properly with a positive mind set and optimistic auto suggestion that you are getting better day by day.
Wishing you speedy recovery!