RU215261U1 - Patient transport trolley - Google Patents

Abstract

The utility model relates to the field of medical technology and can be used for transporting patients with increased weight (up to 300 kg) from the place of their loading on a wheelchair (TK) to transport sanitary vehicles (TS) automobile, water, aviation, as well as after unloading inside premises of clinics and hospitals. Essence of the utility model: a trolley for transporting patients contains a carrier frame with end handles and crossbars with axles for front and rear wheel chassis racks with independent controlled lifting electric drives, upper support wheels, stretcher clamps, a drive control unit with a chassis position control panel between the upper and the lower initial levels of the carrier frame, while the lower racks of the front and rear chassis are rigidly connected to the upper ones, forming the shoulders of an L-shaped two-arm lever. The shoulders of each L-shaped two-arm lever should be placed at a right angle, with the ratio of the lengths of the front or rear chassis rack to one of the racks of the upper support wheel 3: 1, and the distance between the rotation axes of the front and rear chassis racks on the frame crossbars should be chosen no more than the length of the rack front or rear landing gear, while the transverse wheelbase of the lower wheel bearings of the front chassis is greater than the transverse wheelbase of the upper wheel bearings of the rear chassis. The wheels of the front chassis can be equipped with an autonomous reversible rotation electric drive. 1 w.p. f-ly, 12 ill.

Description

The utility model relates to the field of medical technology and can be used for transporting patients with increased weight (up to 300 kg) from the place of their loading on a wheelchair (TK) to transport sanitary vehicles (TS) automobile, water, aviation, as well as after unloading inside premises of clinics and hospitals.

Various types of TC are known for different classes of ambulance vehicles (classes A, B, C), differing in purpose, levels of technical equipment, functionality and carrying capacity.

The most modern are TCs with autonomous mobile electric chassis drives, which can significantly reduce or eliminate the physical load on the paramedic (nurse) when loading and unloading a patient of increased weight (more than 200 kg).

The well-known TC "FERNO POWER FLEXX +" (see, for example: https://bimedis.ru/ferno-power-flexx-m489137) has a wheeled chassis with an electric "scissor" design that provides mechanized lifting of the TC with the patient when loaded into the vehicle, but the disadvantage of this TC is that after installing the raised front wheel supports of the frame on the floor of the vehicle, two paramedics have to hold the leg part of the TC with the patient in their arms (≈40% of his weight = 100 kg) for ≈ 10 s, until its lower wheel the frame will not rise from the electric drive to the level of the vehicle floor for full horizontal rolling of the vehicle into the vehicle. At the same time, the ergonomic norm in the Russian Federation for lifting a load during the work of a paramedic is only 30 kg, and if this norm is exceeded, the risk of a patient with TC falling from his hands increases sharply, often with fatal outcomes (human factor).

This drawback of the FERNO POWER FLEXX+ TC is partially eliminated in the Stryker TC by including in the TC kit (also with cruciform "scissor" chassis) a very complex, massive and expensive receiving device with a monorail in the vehicle cabin with an additional electric carriage with a fork - capture of the frame of the TC, holding it with the patient cantilevered (!) in the process of loading/unloading to/from the vehicle (see, for example: https://yandex.ru/video/preview/10061301410382049189).

The closest solution to the claimed functional features is the design of a medical trolley for ambulance transport company "Ferno" model "iN / X", which received a patent US10512570B2 (patent application US 20160106605A1, IPC A61G1 / 02; A61G1 / 04; A61G1 / 056, op. 04/21/2016). This shopping mall has a longitudinal frame with six crossbars for axles:

- four rocker jet rods for rotary racks of independent front and rear landing gear;

- four swivel bearings of double telescopic electric drives of the rotary racks of the front and rear landing gear.

Longitudinal grooves are made in the beams of the carrier frame of the TC for sliding the rollers of the upper ends of the landing gear and the telescopic retractable front part of the frame with the upper (front) support wheels.

At the same time, the racks of the front and rear wheeled chassis are made in the form of linear two-arm levers, at one upper end of which the rolling rollers are located in the longitudinal grooves of the carrier frame, and at the other end there are wheel bearings of the TC. The combined (hyperbole) movement of the axes of the two-arm levers along the length commensurate with the carrier frame of the chassis is made around the "floating" axles from controlled telescopic electrohydraulic drives (TEP) and jet rods, also connected to the crossbars of the carrier frame so that the axes of the hinged supports form a multi-link trapezium with one variable length side - TEP.

Additional (intermediate) support wheels are fixed on the front rotary rack.

Such a TC has an increased carrying capacity (318 kg) and significantly reduces the physical load on the orderly, ensures the adaptation of the TC mechanisms when loading / unloading it with heavy patients into vehicles of different heights.

However, this TC model has low maneuverability, high kinematic complexity of "scissor" structures, the presence of complex straight-line guides in the frame for rotary-sliding joints is characterized by a large weight (95 kg without a receiving device), high injury risk in the area of work of paramedics' hands near the frame, which makes TC is problematic for use in cramped vehicle compartments and, moreover, in medical aviation, hospitals and requires very high qualifications from paramedics.

The task to be solved by the claimed invention is to simplify and facilitate the design of the TC with an increase in its maneuverability, the reliability of the chassis mechanisms when unifying the rotary nodes of both chassis, which ultimately made it possible to reduce the weight of the TC to 65 kg with a load of up to 300 kg. When implementing this invention, a technical result is obtained, which consists in a significant increase in the ergonomics and reliability of the TC by simplifying its design, where all mechanisms are swivel, non-traumatic by reducing highly loaded complex hinges while maintaining an automated, error-free operator way to control the front and rear the chassis in the process of loading and unloading the TC in the vehicle, as well as managing the manipulations of the frame-lodgment inside the vehicle during resuscitation procedures with a massive patient.

This task is solved by a wheelchair for transporting patients, containing a carrier frame with end handles and crossbars with axles for front and rear wheel chassis racks with independent controlled lifting electric drives, upper support wheels, stretcher clamps, a drive control unit with a chassis position control panel between the upper and the lower initial levels of the carrier frame, in which, according to the proposal, each pair of eight legs of the front and rear landing gear are rigidly connected to each other, forming the shoulders of an L-shaped two-arm lever.

The simplest implementation of a wheelchair is a design in which the arms of each L-shaped two-arm lever are placed at a right angle, with the ratio of the lengths of the front or rear chassis rack to one of the racks of the upper support wheel 3: 1, and the distance between the axes of rotation of the racks of the front and rear chassis on the frame cross members is no more than the length of the front or rear chassis rack, while the transverse wheelbase of the lower wheel bearings of the front chassis is greater than the transverse wheelbase of the upper wheel bearings of the rear chassis, which is necessary to ensure smooth transfer of load from the front chassis to the rear when loading / unloading of the shopping mall in the vehicle (Fig.8).

The drives are powered by standard batteries.

The wheels of the front chassis can be equipped with an autonomous reversible rotation electric drive from the same unit and control panel.

Wheelchair frame elements can be supplemented with reinforcing elements.

The utility model is illustrated by graphic materials.

In FIG. 1 shows a side view of the TC in the unfolded state (dashed line shows the folded state).

In FIG. 2 shows a top view of the TC.

In FIG. 3-9 shows the stages of loading the TC on a plane corresponding to the floor in the vehicle cabin.

In FIG. 10-12 show additional functional provisions of the TK for clinics.

The following positions are marked on the images:

1 - Carrier frame with jumpers and axles of the front SH1 and rear SH2 chassis;

2 - Racks of the front and rear wheeled chassis (4 pcs.);

3 - Racks of the upper support wheels (4 pcs.);

4 - Electric actuators of the front and rear chassis;

5 - Axles of the wheel supports of the front and rear chassis on the frame jumpers;

6 - Control unit;

7 - Control panel (PU);

8 - Stretcher lock on the frame.

In addition, in FIG. 1 shows the following dimensions, which serve to understand the essence of the utility model:

h1 - frame height in the lower initial position (for transportation to the vehicle and transfer of the patient);

h2 - frame height in the upper initial position (for transportation outside the vehicle);

h3 - loading (adjustable) height of the wheel supports of the front chassis (for loading and unloading in the vehicle).

TC (Fig. 1, Fig. 2) for transporting patients contains a carrier frame 1 with end handles and crossbars with axles 5 for racks 2 of the front and rear wheel chassis with independent controlled lifting electric drives (actuators 4), racks 3 of the upper supporting wheels, clamps stretcher 8, drive control unit 6 with control panel 7 (figure 2) positions of the chassis 2 between the upper and lower initial levels of the carrier frame 1. Each rack 2 of the front and rear chassis is rigidly connected to one of the racks 3 of the upper support wheel, forming shoulders G -shaped two-arm lever (in this embodiment, the angle between posts 2 and 3 is straight.

Stages of loading and unloading the shopping cart into the cabin of the vehicle.

1. The lower initial position of the TC for placing the patient (Fig. 3).

2. Lifting the TC to the upper position (Fig. 4) from the lower initial position (Fig. 3) - using the control buttons on the remote control 7 (Fig. 2) through the control unit 6, controlling the actuators 4, turning the front chassis and rear chassis 2.

3. Move the vehicle forward into the passenger compartment of the vehicle so that the front wheel supports on racks 3 stand on the floor of the vehicle. If necessary, use the buttons on the control panel 7 (Fig. 2) to adjust the loading height of the shopping cart (Fig. 5).

4. Raising the frame 1 of the shopping mall up until the actuators 4 are automatically turned off by built-in microswitches (not shown) - fig. 6.

5. Promotion of the shopping mall into the passenger compartment of the vehicle until the threshold of the vehicle stops in the upper part of the front pillars 2 when the rear wheel supports on the pillars 3 enter the passenger compartment of the vehicle (Fig. 7).

6. Further promotion of the TC into the vehicle interior with subsequent lifting by the actuator 4 of the rear pillars 2 (control of the buttons of the control panel 7) and, accordingly, the middle part of the frame 1 of the TC up to the stop, supporting the TC by the frame (in this case, the center of gravity of the patient and the TC are already inside the cabin supported by 6 wheels: 4 on racks 3 and 2 on racks 2 - Fig. 8). To ensure such a position, the distance between the axes of rotation of the front and rear chassis racks on the frame cross members is chosen not to exceed the length of rack 2 of the front or rear chassis, while the transverse wheelbase of the lower wheel bearings of the front chassis is greater than the transverse wheelbase of the upper wheel bearings of the rear chassis.

7. Advance the TC horizontally forward until it stops against the front floor clamp of the TC (not shown). The trolley takes the position of the "lower starting" in the cabin of the vehicle (Fig. 9).

Fig. 8. Manually fixing the floor brake (not shown) of the TC frame in the vehicle behind the axles of the front supporting wheels on racks 3.

Departure of the shopping mall from the cabin of the vehicle is carried out in the reverse order.

TC also allows to provide the following functional positions (by changing the positions of actuators 4):

- the position of the "trendelenburg" lodgment (Fig. 10);

- the position of the “anti-trendelenburg” lodgement (Fig. 11);

- position of orthostatic verticalization (cosmonaut training procedures, therapeutic stretching of the spine, etc.).

In addition, the design of the rolling cart allows:

- carry out a 360° turn of the frame 1 TC with the patient around the center of gravity, combined with the wheel bearings of the front landing gear 2, while all other wheel bearings are raised above the floor (ground) by 50-100 mm;

- independent control of the height of the wheel supports of the front and rear chassis allows you to "step over" the thresholds and move the TC along the stairs with the horizontal position of the frame and the stretcher with the patient;

- equip frame cross members 1 with load cells informing operators about the actual severity of the patient in order to reduce risks when managing TC with especially severe patients;

- equip it with lighting devices when working in conditions of insufficient visibility;

- equip the TC lodgement or stretcher with X-ray transparent panels with a large number of handles (10-16 units) for group carrying and shifting of a massive patient outside the TC application area.

Claims (2)

1. A trolley for transporting patients, containing a carrier frame with end handles and crossbars with axles for racks of the front and rear wheeled chassis with independent controlled electric lift drives, upper support wheels, stretcher clamps, a drive control unit with a control panel for the chassis positions between the upper and the lower initial levels of the carrier frame, characterized in that each carrier rack of the front and rear chassis is rigidly connected to one of the racks of the upper support wheel, forming the shoulders of an L-shaped two-arm lever. 2. The wheelchair according to claim 1, characterized in that the shoulders of each L-shaped two-arm lever are placed at a right angle, with the ratio of the lengths of the front or rear chassis rack to one of the racks of the upper support wheel 3: 1, and the distance between the rotation axes front and rear chassis racks on the frame cross members is no more than the length of the front or rear chassis rack, while the transverse wheelbase of the lower support wheels of the front chassis is greater than the transverse wheelbase of the rear upper support wheels.

Images