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SYSTEM AND METHOD FOR LOCKING AND UNLOCKING PATIENT TABLE ACTUATION MECHANISM

IP.com Disclosure Number: IPCOM000245278D
Publication Date: 2016-Feb-25
Document File: 6 page(s) / 200K

Publishing Venue

The IP.com Prior Art Database

Abstract

Systems and methods for locking and unlocking the patient board vertical actuation mechanism in a detachable table for MRI machines are disclosed. The invention describes mechanical methods using linear brake, cam brake or wheel restraining to lock the scissor lift, thus relieving the constant loading of the hydraulic system. The locking mechanism is configured to get locked automatically when the patient is raised to the uppermost position. With a snap action, the locking mechanisms unlock and do not need a positive source for the same. The advantages of the invention include reducing the cost of hydraulic components, and removing the need for constant maintenance.

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SYSTEM AND METHOD FOR LOCKING AND UNLOCKING PATIENT TABLE ACTUATION MECHANISM

BACKGROUND

The invention relates to systems and methods for locking and unlocking the patient board vertical actuation mechanism in a table used in magnetic resonance imaging (MRI) machines. The table is configured with scissor lift assembly for upward and downward movement of the patient board. In current systems, a hydraulic actuator is used for holding the board at the top position, as shown in FIG. 1. This arrangement requires high precision of hydraulic components to avoid leakages while loading the actuator. The hydraulic actuator will be loaded even more with the increase in the patient weight that is required to be carried by the system. In some instances, the detachable table is docked to the magnet and kept for long periods at the top level. This leads to continuous loading of the hydraulic actuator. These actuators suffer from leakage problem and routine service is required to keep them in working order. One current solution is to lock the hydraulic actuator directly using mechanical clamps. These clamps are held in place by pneumatic or hydraulic means and require a positive source of energy to unlock the clamps. The scissor assembly is locked using manual operations, which have to be repeated before the scissors can be unlocked. Thus, there is a need for a better locking mechanism which could relieve the constant loading on the actuator in the table.

FIG. 1: Patient table in the magnetic resonance imaging (MRI) system

BRIEF DESCRIPTION OF DRAWINGS

The invention discloses systems and methods for locking and unlocking the patient board vertical actuation mechanism in a detachable table, wherein:

Fig. 1 illustrates patient table in the magnetic resonance imaging (MRI) system.

Fig. 2 illustrates a configuration of the scissor lift mechanism with locking arrangement.

Fig. 3 shows a scheme for locking scissor lift mechanism by linear brake.

Fig. 4 shows a scheme for locking scissor lift mechanism using cam brake.

Fig. 5 shows a scheme for locking scissor lift mechanism by wheel restraining.

DETAILED DESCRIPTION

The invention proposes systems and methods for locking and unlocking the patient board vertical actuation mechanism in a detachable table for MRI machines. The disclosure describes mechanical methods to lock the scissor lift, thus relieving the constant loading of the hydraulic system. The methods include three mechanisms, namely, 1) linear brake, 2) cam brake and 3) wheel restraining, configured to get locked automatically when the patient is raised to the uppermost position. With a snap action the locking mechanisms unlock and do not need a positive source.

The configuration of the scissor lift mechanism with locking arrangement is illustrated in FIG. 2. The locking mechanism is deployed at the bottom of the scissor lift and placed on the base of the table. The locking mechanism comprises a bottom roller, a locking rod and a brake, as shown in FIG. 2...