Depending on the need for installation and type of base, trolley or chair, we can find various types of fixation. Among the most common we find:

A - Through hole: It has a hole in which a screw or stem is inserted. It is a very simple installation system. Ideal for wheels that should not support a lot of load.
B - Threaded stem: It has a threaded stem or nut, it is fixed to the surface with a nut. It is usually the most used fastening system.
C - Angular plate: They are usually less used fastening systems, they have lateral plates to fix on the base.
D - Plate: It has a rectangular or square plate on its surface, it includes 4 or more fastening holes to the base, it is one of the most common.
E - Smooth stem: The stem without thread is inserted into the female of the base, we can find it in the typical office chairs with wheels, TV furniture etc ...

The Trendelenburg is a position in which a patient lies down with the head lower than the feet. This position is used in surgery and intensive care to improve blood circulation to the brain and abdominal organs.

For example, it is used for patients who are undergoing surgery in the pelvic or abdominal area, as it helps reduce the amount of bleeding during surgery.

The Trendelenburg position is achieved by placing a board under the bottom of the patient's bed so that the head is lower than the feet. The inclination is usually around 20-30 degrees. This position can help improve blood flow to the brain, as gravity helps increase pressure in the veins of the neck, which in turn helps increase venous return.

Additionally, in patients with heart failure, the Trendelenburg position may help improve blood flow to the heart and abdominal organs, which may be beneficial for organ oxygenation and cardiovascular function.

However, this position is not suitable for all patients, in some cases it can cause problems such as decreased blood flow to the heart, decreased pulmonary oxygenation, or even intraocular or ocular pressure. Therefore, it is necessary to evaluate each particular case and the needs of the patient before making the decision to use the Trendelenburg position.

Reverse Trendelenburg is a position in which a patient lies with their head higher than their feet. This position is used in some cases to improve blood circulation in the abdominal organs, especially in patients with heart failure problems. In the reverse Trendelenburg position, gravity helps increase pressure in the abdominal veins, which in turn helps increase venous return and improve circulation to the abdominal organs. This position can also be used in patients with respiratory failure, as it can help alleviate symptoms and improve organ oxygenation. However, it is important to bear in mind that this position is not suitable for all patients, and it can cause problems such as decreased blood flow to the brain, decreased pulmonary oxygenation, or even intracranial pressure, therefore it is necessary to evaluate each particular case. and the needs of the patient before making the decision to use the reverse Trendelenburg position.