Patient transfer device with proximity sensor

Abstract

A patient transfer device for transferring a patient placed on a sheet or mattress (hereinafter referred to as "sheet or the like") from a first surface to a receiving surface, the patient transfer device comprising: a retractable pull wire; a traction arrangement including a motor operatively connected to the pull wire to enable winding of the pull wire by the motor; and a holder arrangement for holding the sheet or the like when moving the sheet or the like to transfer a patient placed thereon. The holder arrangement has a holder element to which a first end of the pull wire is attached, and the traction arrangement, when positioned to hold the sheet or the like, moves the holder arrangement and the holder element toward the traction arrangement by winding the pull wire so as to move the sheet or the like toward the traction arrangement and transfer the patient placed on the sheet or the like from the first surface to the receiving surface, and the traction arrangement is provided with a proximity sensor configured to detect whether the holder element has reached an end position at or near the traction arrangement.

Description

[Technical Field]

[0001] The present disclosure relates to a patient transfer device for transferring a patient resting on a sheet or mattress from a first surface to a receiving surface, such as from one bed to an adjacent bed or operating table. [Background technology]

[0002] In hospitals, nursing homes, and other settings and certain situations, it is necessary to transfer a patient from one surface to an adjacent surface, such as from one bed to an adjacent bed or operating table. This operation can be performed either manually, requiring the cooperation of several nurses or other skilled personnel, or by a patient transfer device. Patient transfer devices configured to move a patient from one surface to another are commonly known.

[0003] Specifically, U.S. Patent Publication No. 2006090258 discloses a patient transfer device for transferring a patient positioned on a movable sheet on a first hospital bed to a second receiving hospital bed. The patient transfer device includes a base, a motor attached to the base, two straps connected to the motor so as to be retractable by the motor, and a clamp assembly releasably attachable to the sheet. The patient transfer device can thus be positioned on one side of the receiving hospital bed opposite the first hospital bed and connected to the sheet on which the patient is reclining. The clamp assembly can then be used in conjunction with the motor and the two straps to tow the sheet on which the patient is reclining from the first bed to the second receiving bed.

[0004] WO 9613239 discloses a patient transport system for transporting a patient from a bed to a stretcher or vice versa using a bed sheet and a conveyor attached to the bed or the stretcher. The sheet is removably attached to the conveyor by a clip arrangement, and the clip is attached to the conveyor by a flexible belt. The conveyor is manually operated using a handle. However, using many of these devices often involves labor-intensive, time-consuming, and / or ergonomically challenging steps; therefore, there is a need for improved patient transfer devices. Summary of the Invention

[0005] The present disclosure relates to a patient transfer device for transferring a patient positioned on a sheet or mattress from a first surface to a receiving surface, the patient transfer device comprising: a traction arrangement including at least one retractable pull wire and a motor operatively connected to the pull wire, allowing the motor to retract the pull wire; and a holder arrangement for holding the sheet or mattress as it moves, thereby transferring the patient positioned on the sheet or mattress.

[0006] The holder configuration comprises a holder element to which a first end of a traction wire is attached, and the traction configuration is configured to wind up the traction wire, thereby moving the holder configuration and the holder element toward the traction configuration, so as to move the sheet or mattress toward the traction configuration when the holder configuration is positioned to hold the sheet or mattress, thereby transferring a patient placed on the sheet or mattress from the first surface to the receiving surface.

[0007] Furthermore, the towing arrangement is provided with a proximity sensor configured to detect whether the holder element has reached an end position at or near the towing configuration.

[0008] A signal from such a detector is useful to indicate that patient transfer is complete and that, once the tow wire is fully retracted, the motor should be powered down to avoid damage to the patient transfer device. For example, if the motor is still running and a portion of the holder arrangement becomes caught in or within the tow arrangement, the motor may be damaged. The proximity sensor simplifies operation of the patient transfer device and avoids the risk of damage to the device. The sensor signal may be used to generate an alarm signal to alert the user to the situation and / or to generate a control signal to stop operation of the motor.

[0009] Proximity sensors can be based on a variety of contactless technologies that sense the presence or change in an electromagnetic field or electromagnetic radiation.

[0010] Typically, a patient transfer device comprises two laterally spaced, parallel-arranged traction wires, both of which may be wound by the same motor (e.g., via first and second bobbins for each wire). In this case, the patient transfer device may comprise first and second proximity sensors, one for each wire / holder element. One of the proximity sensors may then be arranged to detect when the corresponding holder element has reached an end position and generate an alarm and / or control signal.

[0011] In one embodiment, the patient transfer device is provided with a control circuit configured to control operation of the motor in response to a sensor signal received from the proximity sensor, the control circuit being configured to stop operation of the motor upon receiving a sensor signal indicating that the holder element has reached an end position. The control circuit may comprise a number of connected control units, sensors etc. and is typically configured to process control signals generated by the user as well as to control other parts of the patient transfer device.

[0012] In one embodiment, the proximity sensor is configured to sense the presence or change of an electromagnetic field or beam of electromagnetic radiation. The holder element may, for example, be provided with a magnet or piece of iron that can be detected when it is close to the sensor. Alternatively, a change in backscatter from a light source may be used to detect when the holder element is located near the sensor.

[0013] In one embodiment, the proximity sensor is configured to sense the presence or change of a magnetic field, such as a Hall Effect sensor, and the holder element is provided with a magnet.

[0014] In one embodiment, the holder arrangement includes a stop arrangement configured to hold the first end of the tow wire in place relative to the holder element, and the holder element encapsulates the stop arrangement. The stop arrangement may, for example, be a ferrule clamped to the tow wire. To prevent the holder element from getting caught in sheets or other parts as it moves over a surface during winding of the tow wire, it is advantageous for the holder element to have a rounded shape, a smooth surface, and no parts, such as the stop arrangement, protrude from its surface. Therefore, it is advantageous for the stop arrangement to be located inside the holder element, i.e., for the holder element to encapsulate the stop arrangement. This encapsulation also protects the stop arrangement from dust, making the holder arrangement easier to clean.

[0015] In one embodiment, the holder element is provided with a first aperture, a second aperture and a third aperture, and the stop arrangement is located within the holder element at the first aperture.

[0016] In one embodiment, the tow wire extends out of the holder element through the first aperture and back into the holder element through the second aperture, forming a loop between the first and second apertures on the outside of the holder element. This wire loop can be used to connect to knobs or the like to hold sheets or a mattress. Thus, the wire loop (together with the holder element and other portions) can form part of the holder configuration.

[0017] In one embodiment, the tow wire extends out of the holder element through the third aperture and further extends towards the tow arrangement.

[0018] In one embodiment, the pull wire is free to move relative to the holder element between the second and third apertures such that the loop of the pull wire tightens or contracts when the pull wire is pulled out of the third aperture, and such that the loop of the pull wire loosens or expands when the pull wire is pulled out of the second aperture.

[0019] In one embodiment, the holder element comprises a first portion and a second portion, the first and second apertures being disposed within the first portion and the third aperture being disposed within the second portion, the first portion being arranged to interconnect with the second portion such that, upon connection, the first portion and / or the second portion enclose the stop arrangement. The use of two (or more) portions allows the pull wire and stop arrangement to be properly positioned within the holder element before the portions are interconnected.

[0020] In one embodiment, the first and second parts of the holder element are arranged such that a portion of one of the parts is inserted within the other when the first and second parts are pressed together and connected to form the holder element, and the first and second parts are provided with a pair of complementary circumferentially extending mating locking members that engage when the first and second parts are pressed together. For example, the portion of the second part that is inserted within the first part can be provided with an outer flange, and the portion of the first part that is intended to receive the portion of the second part can be provided with a complementary inner groove that is adapted to receive the flange when the two parts are pressed together.

[0021] In one embodiment, the complementary circumferentially extending mating locking members comprise a flange and a groove, the flange having an inclined surface oriented to facilitate passage of the mating locking member when the first and second portions are pressed together, and the flange having a straight surface oriented in the opposite direction to prevent unintentional passage of the mating locking member when the first and second portions are pressed together and connected.

[0022] In one embodiment, the stop arrangement comprises a knot formed by the pull wire and / or a stop member attached to the pull wire.

[0023] In one embodiment, the stop arrangement includes a ferrule disposed around the pull wire, the ferrule being clamped onto the pull wire to securely attach to the pull wire, the ferrule having a diameter greater than the diameter of the first aperture over at least a portion of its length. The ferrule and wire end are thus secured within the holder element. To provide stable clamping of the ferrule, the pull wire may be bent 180 degrees near its end so that the ferrule is disposed and clamped around the "double" wire.

[0024] In one embodiment, the holder element is provided with a wire guiding channel through which the tow wire passes, the wire guiding channel extending between the second aperture and the third aperture, part of the wire guiding channel being formed by a guide tube connected to the first part and extending towards the second part, the wire guiding channel eliminating or reducing the risk of the tow wire getting caught inside the holder element.

[0025] In one embodiment, the holder element comprises a magnet, which allows for example a Hall effect sensor to be used as a proximity sensor.

[0026] In one embodiment, the magnet is provided with a through-hole through which the towing wire passes. The magnet is preferably arranged inside the holder element so that the through-hole forms part of the wire guide channel. Using such a magnet and arranging the wire as described above means that the magnet surrounds the towing wire, and therefore means that even if the towing wire and the holder element rotate (along the longitudinal direction of the wire), when the holder element reaches the proximity sensor during winding of the wire, part of the magnet will always be positioned on the side facing the proximity sensor. This ensures that the magnet is not too far away from the sensor, which would result in a weak sensor signal.

[0027] In one embodiment, the magnet is disposed within a second portion of the holder element opposite the first portion, and the guide tube is adapted to hold the magnet in place when the first and second portions are interconnected. The magnet may be placed within a recess adapted to receive the magnet, and the wire guide tube holds the magnet in place when the two portions of the holder element are connected. In this case, the wire guide tube has the dual purpose of guiding the wire and holding the magnet in place.

[0028] In one embodiment, the holder element is made from a polymer material, such as a plastic or rubber material.

[0029] In one embodiment, the traction arrangement comprises a wire bobbin connected to the motor, and the proximity sensor is positioned relative to the wire bobbin.

[0030] The puller wire may be made of a polymer material.

[0031] In one embodiment, the proximity sensor protrudes through a hole in the casing so that it is positioned at least partially above the top surface of the casing in the towing configuration, such that when the wire is towed and the holder element approaches the sensor, the sensor can be in close proximity to the holder element.

[0032] In one embodiment, a component such as a wire guide and / or a receptacle for a holder element is arranged on top of and around the proximity sensor, with a recess on the underside of the component providing space for and configured to accommodate the protruding portion of the proximity sensor. The component protects the sensor and can be attached to the top surface of the casing. The component can also hold the element in place at its end position.

[0033] The wire loop can be connected to a mattress member or a sheet member. The mattress member can, for example, comprise a mattress holder provided with an opening, which is attached to the mattress. The mattress member can further comprise a shackle member, such as a carabiner, which is releasably attached to the opening. In that case, the wire loop of the holder arrangement can be connectable to the carabiner, i.e., the carabiner can be inserted into the loop. The holder arrangement is thus suitable for holding a mattress via the mattress member.

[0034] The sheet member may, for example, comprise a rod having one or more knobs, and in that case, the loops of the holder arrangement may be connected to the knobs with the sheet disposed between the knobs and the loops. In this way, the holder arrangement is suitable for holding the sheet via the sheet member.

[0035] The holder arrangement allows for quick and secure attachment of a sheet or mattress. When the holder arrangement is connected to the knob to hold the sheet in place between the knob and the holder arrangement, the towing arrangement can be used to transfer a patient lying on the sheet on a bed from a first surface of the bed to a receiving surface. Similarly, when the holder arrangement is connected to a mattress member attached to a mattress, the towing arrangement can be used to transfer a patient lying on the mattress from a first surface of the bed to a receiving surface. The receiving surface can be another bed or can be a resting surface, for example, in an X-ray or computed tomography (CT) machine or in a preparation room for magnetic resonance imaging (MRI).

[0036] The holder arrangement is easily attached to the knob with the sheet therebetween when the patient is positioned next to the receiving surface, and provides stable support for the sheet during patient transport. Once the patient is transported, the holder arrangement can be easily detached from the knob and sheet.

[0037] Similarly, the holder arrangement can be easily attached to the mattress member when the patient is positioned next to the receiving surface and can stably hold the mattress during patient transport, and can be easily removed from the mattress member once the patient has been transported.

[0038] The holder configuration of the present disclosure is also useful when the patient holder device does not have any proximity sensors.

[0039] The loop size of the holder configuration is reconfigurable, allowing the holder configuration to be used with different sized sheet or mattress members without modification, providing versatility. For example, when a sheet is attached to the holder configuration, it is unlikely that the sheet will fold uniformly over the knob. Therefore, this holder configuration may be advantageously used to hold sheets of various materials and thicknesses that fold in various ways and therefore have a variety of effective diameters for the knob / sheet combination. Furthermore, the shapes of the contact surfaces between the loop and the knob preferably correspond to each other and fit snugly, thereby increasing the contact surface for the sheet.

[0040] The larger contact surface reduces wear and stress on the sheets, preventing the holder arrangement from slipping and tearing the sheets.

[0041] The holder configuration of the present disclosure includes few parts that are easy to manufacture and easy to clean.

[0042] According to some embodiments, the stop arrangement includes a knot formed by the pull wire. The knot can be positioned, for example, so that the pull wire cannot pass through the first aperture. This allows the knot to securely hold the first end of the pull wire in place relative to the first aperture. The knot is advantageous in that it does not require any additional components or materials. Alternatively or in combination, the stop arrangement can include a stop member positioned on the pull wire. The stop member can be, for example, a clamp that is deformed and attached to the pull wire. Furthermore, the stop arrangement can be integrated into the first portion. For example, the first aperture can include teeth positioned to allow the pull wire to be pulled only in a first direction. The teeth lock the pull wire if the pull wire is pulled in a direction opposite the first direction.

[0043] According to some embodiments, the holder element has a rounded shape. This reduces dust accumulation on the holder element. For example, the first and second portions may each have a truncated cone shape extending in the direction of extension of the pull wire from the third aperture. Additionally, the holder element preferably has a rounded shape that provides low friction when the holder element slides over a surface. The rounded shape also reduces deterioration of surfaces on which the holder element slides, such as surrounding mattresses, sheets, and plastic materials.

[0044] According to some embodiments, the first portion has a front surface, and the first and second apertures are disposed on the front surface. The first surface may have a protrusion disposed between the first and second apertures and extending from the first surface. The protrusion is configured to provide a gap between the pull wire and the front surface when the loop is in a minimum configuration, i.e., when the holder configuration is not engaged with the knob or shackle member and the second end of the pull wire is pulled in a direction away from the holder configuration. The protrusion facilitates gripping the pull wire when the holder configuration is not engaged with a sheet member or mattress member, thereby facilitating use of the holder configuration.

[0045] According to some aspects, the traction arrangement includes a receiving member configured to receive the holder element, the receiving member having a complementary shape to the holder element, thereby providing a configuration to receive the holder element when the holder element is fully pulled toward the patient transfer device. In particular, the receiving member can be disposed relative to a wire bobbin connected to the second end of the traction wire.

[0046] According to some aspects, the patient transfer device is mounted on a frame that is equipped with wheels, allowing the patient transfer device to be easily moved and repositioned.

[0047] According to some aspects, the sheet traction arrangement is mounted on the frame in a height-adjustable manner, so that the patient transfer device can be adapted to different heights.

[0048] According to some aspects, the patient transfer device is mounted on an adjustable wall-mounted arm.

[0049] Also disclosed is a system comprising the patient transfer device described above and a mattress member and / or sheet member attached to and positioned on a mattress.

[0050] According to some aspects, the mattress member is provided with an opening and a shackle member, the shackle member being releasably attached to the opening and the holder arrangement being connectable to the shackle member.

[0051] According to some embodiments, the sheet member is provided with at least one knob, and the holder arrangement is connectable to the sheet member so as to hold the sheet in place between the knob and the holder arrangement when connected. Such a sheet member provides stable attachment to the sheet, thereby allowing a patient positioned on the sheet to be safely transported.

[0052] According to some embodiments, the sheet member is an elongated member extending in the longitudinal direction, and the sheet member includes two knobs spaced a predetermined distance apart in the longitudinal direction, and these knobs are arranged to extend in the longitudinal direction, thereby providing a sheet member that is easy to manufacture and that makes it easy to pull the sheet straight.

[0053] According to some aspects, the knob comprises a head and a base, the base having a circular cross section and the head being larger than the base, and in some further aspects, the base comprises a circumferentially extending rounded groove, which allows for quick and stable attachment of the attachment means to the knob.

[0054] In general, all terms used in the claims are to be interpreted in accordance with their ordinary meaning as used in the art unless expressly stated otherwise. Any reference to "a / an / the element, apparatus, component, means, step, etc." should be broadly interpreted to refer to at least one example of such element, apparatus, component, means, step, etc., unless expressly stated otherwise. The steps of any method of the present disclosure need not be performed in the exact order disclosed, unless expressly stated otherwise. Furthermore, the features and advantages of the present disclosure will become apparent upon consideration of the appended claims and the following description. Those skilled in the art will recognize that various features of the present disclosure can be combined to create embodiments other than those described below without departing from the scope of the present disclosure. [Brief explanation of the drawings]

[0055] A more detailed description of embodiments of the present disclosure will now be given, by way of example, with reference to the accompanying drawings, in which: [Figure 1] 1 illustrates a patient transfer device. [Figure 2] Shows the knob. [Figure 3] The holder configuration is shown. [Figure 4] 1 shows some of the holder elements used in the holder configuration. [Figure 5] 1 shows a portion of a tow wire. [Figure 6] 1 shows a cross-sectional view of a holder element with a tow wire disposed therein. [Figure 7a] 1 shows a view of a first part of a holder element. [Figure 7b] 1A-1C show different views of the first part of the holder element; [Figure 8a] 10 shows a view of a second part of the holder element. [Figure 8b] 10A-10C show different views of the second part of the holder element; [Figure 9a] Shows the knob. [Figure 9b] The knob is shown with the sheets. [Figure 9c] 1 shows the holder configuration before being set to the locked state. [Figure 9d] 1 shows the holder configuration in a locked state. [Figure 10a] 2 illustrates the patient transfer device of FIG. 1 when used to transfer a patient from a first surface to a receiving surface. [Figure 10b] 2 illustrates the patient transfer device of FIG. 1 when used to transfer a patient from a first surface to a receiving surface. [Figure 11] 1 illustrates a further example of a patient transfer device. [Figure 12] 1 illustrates another patient transfer device. [Figure 13] 1 shows the holder arrangement and mattress member. [Figure 14a] The sheet member is shown with the knob. [Figure 14b] Sheet member shown with sheet [Figure 14c] 1 shows the holder configuration before being set to the locked state. [Figure 14d] 1 shows the holder configuration in a locked state. [Figure 15] 1 illustrates an example configuration of a proximity sensor for a patient transfer device. [Figure 16] 1 illustrates an example configuration of a proximity sensor for a patient transfer device. DETAILED DESCRIPTION OF THE INVENTION

[0056] The present disclosure will now be described in more detail with reference to the accompanying drawings. In the following description, specific aspects of the present disclosure will be presented. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to the embodiments and aspects set forth herein. Rather, these embodiments are provided as examples so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals refer to like elements throughout this specification.

[0057] It should be understood that the present disclosure is not limited to the embodiments described herein and illustrated in the drawings, but rather, those skilled in the art will recognize that many modifications and variations may be made within the scope of the appended claims.

[0058] The patient transfer device 101 shown in FIG. 1 includes, in the illustrated example, a holder arrangement 101, a towing arrangement 107, and a frame 102 to which the towing arrangement 107 is attached. The frame 102 is arranged to rest on a horizontal surface, such as a floor, and is provided with wheels 105 for moving the patient transfer device 101 on this surface. The towing arrangement 107 includes a motor 103 connected to two wire bobbins 108 and an outer casing 104 that covers the motor 103 and the wire bobbins 108 and protects them from contamination, for example, from contact with dust or bodily fluids from a patient being transported using the patient transfer device 101. The outer casing may be completely removable or may be hinged, allowing the outer casing to be opened for cleaning or replacing the wire bobbins. The outer casing may be provided with a removably attached pad so that it can be removed from the outer casing.

[0059] The illustrated patient transfer device 101 includes means for vertically adjusting the position of the traction arrangement 107. This may be, for example, an electric motor (not shown) located within the frame 102 that can move the traction arrangement 107 along a vertical track 106 or groove within the frame 102.

[0060] The motor 103 is coupled to two laterally spaced wire bobbins 108 used to pull the patient from the first surface to the receiving surface. The laterally spaced first and second pull wires 3 are wound onto corresponding wire bobbins 108 as they are wound by operating the motor 103 and rotating the bobbins 108. Each bobbin 108 is mechanically connected to the motor 103 either directly or via a shaft driven by the motor. A holder element 2 (shown in more detail in FIG. 3 ) is disposed in connection with each first end 8 of the two wires 3. The holder structure is adapted to be releasably attached by the loops of the pull wires 3 to corresponding knobs 14 disposed on the sheet member 17, which in this example is an elongated connecting member. In other words, the sheet member may be provided with at least one knob, and the holder structure is connectable to the sheet member so as to hold the sheet in place between the knob and the holder structure upon connection. The holder arrangement is also adapted to be releasably attached to a mattress member that is attached to a moveable mattress, the mattress member being described in more detail below.

[0061] 10a-10b are perspective views illustrating the use of a patient transfer device 101 in transferring a patient 117 from a first surface 113 (in the illustrated case, a first bed) to a receiving surface 114 (in the illustrated case, a receiving bed 115). In FIG. 10a, the patient 117 is lying on a sheet 116 on the first bed, and the holder arrangement 1 of the patient transfer device 101 is connected to this sheet. The receiving bed 115 is arranged alongside the first bed, and the patient transfer device 101 is arranged on the opposite side of the receiving bed. In FIG. 10b, the motor 103 of the patient transfer device 101 reels the holder element 2 towards the patient transfer device 101 and the receiving bed 115. This creates a traction force on the sheet 116 on which the patient 117 is lying. In this way, the patient 117 is transferred from the first surface 113 to the receiving surface 114.

[0062] FIG. 12 illustrates the patient transfer device of FIG. 1 in which the sheet member 17 is replaced with a mattress member 202. The mattress member 202 is attached to a movable mattress 201. The movable mattress may be, for example, a foam mattress. In FIG. 12, the mattress member includes a mattress holder 203 and two shackle members 205. The mattress holder has five openings 204. However, generally, the mattress member may include any number of openings and shackle members. In particular, in FIG. 12, each shackle member is formed by a carabiner. A carabiner is a type of shackle and includes a loop with a spring-loaded gate. The carabiner loop typically includes metal. Two holder structures are releasably attached to each carabiner. The carabiners are releasably attached to respective openings in the mattress holder 203. The mattress holder may include fabric. The fabric may be sewn to the movable mattress. Alternatively, the mattress holder may comprise a harder material such as plastic. The mattress holder may be attached to the moveable mattress by other means such as adhesive, screws, etc.

[0063] In Figure 12, the patient transfer device 101 is transferring a movable mattress 201 from a first surface of a first bed to a receiving surface of a receiving bed 115. The receiving bed 115 is arranged alongside the first bed, and the patient transfer device 101 is arranged on an opposite side of the receiving bed from the first bed. The motor 103 of the patient transfer device 101 reels the holder element 2 towards the patient transfer device 101 and the receiving bed 115. This creates a traction force on the movable mattress 201 on which the patient can lie. In this way, the patient can be transferred from the first surface to the receiving surface.

[0064] The openings 204 of the mattress holder 203 are spaced apart. In the example shown in Fig. 12, the two openings are spaced apart by a distance corresponding to the distance between the wire bobbins of the traction arrangement 107. This allows the traction arrangement 107 to pull the holder arrangement in a straight line. The mattress holder 203 can distribute the load caused by pulling the mattress on which the patient rests to both wires 3. The patient transfer device is preferably positioned so that the pulling force acting on the mattress is parallel to the traction wires 3 of the traction arrangement. This prevents the holder arrangement from shifting position during patient transfer.

[0065] The sheet member 17 (shown, for example, in FIG. 1 ) may be a rigid rod or some kind of flexible wire. In the illustrated example, a rod is used as the sheet member. A number of knobs are mounted on the rod at a distance (in the illustrated example, a distance corresponding to the distance between the wire bobbins of the traction arrangement 107) that allows the traction arrangement 107 to pull the holder arrangement straight. The rod may be provided with three or more knobs, for example, depending on the length of the rod or the size of the sheet. The rod can distribute the load caused by pulling the sheet on which the patient is lying across both wires 3. In the illustrated example, the rod is provided with two knobs located at both ends of the rod. The rod or wire can also simplify handling of the holder arrangement, for example, by allowing both wires 3 to be unwound from their respective wire bobbins 108 simultaneously. The sheet member also ensures that the distance between the two knobs corresponds to the distance between the attachment points of the traction wires of the traction arrangement. The patient transfer device is preferably positioned so that the traction forces acting on the sheet are parallel to the traction wires 3 of the traction arrangement, thereby preventing displacement of the holder arrangement during patient transfer.

[0066] FIG. 11 shows a perspective view of a patient transfer device according to another embodiment of the present disclosure. Here, the towing arrangement 107 of the patient transfer device 101 is mounted on an adjustable, movable arm 111 attached to a wall 112. It should be understood that the movable arm 111 may extend from a ceiling mount instead of a wall mount, and the number of joints on the arm may be different. In the illustrated example, the sheet member 17 is a longer rod than in the previous example and has five knobs 14. Two of the knobs are spaced apart at a distance corresponding to the distance between the wire bobbins of the towing arrangement 107, as described above. This allows the towing arrangement 107 to tow the holder element in a straight line. One knob is located between the two knobs used to tow the holder element, and two knobs are located at the outer ends of the rod. Using more knobs allows for a more even distribution of the load on the sheet, which may be advantageous when transporting heavier patients.

[0067] 14a shows another example of a sheet member 17. Here, the sheet member is an elongated member extending in the longitudinal direction, and the sheet member has two knobs spaced apart in the longitudinal direction by a predetermined distance, and these knobs are arranged extending in the longitudinal direction. This provides a sheet member that is easy to manufacture and makes it easy to pull the sheet straight.

[0068] The pull wire is preferably one that is easy to clean and does not interfere with other equipment in a hospital environment, and therefore is preferably made from a synthetic material such as polyester and / or Dyneema®.

[0069] 1, the traction arrangement 107 is provided with first and second proximity sensors 51, 52, one for each wire bobbin / holder element, configured to detect whether the corresponding holder element 2 has reached an end of the external housing 104 near the corresponding bobbin 108. In this example, the proximity sensors 51, 52 are Hall effect sensors capable of sensing the presence of a magnet 6 located within the holder element 2. The exact positioning of the proximity sensors 51, 52 will depend, for example, on the specific design of the patient transfer device 101.

[0070] 1 , the patient transfer device 101 is provided with a control circuit 53 configured to control the operation of the motor 103 in response to, for example, sensor signals received from the proximity sensors 51, 52. The control circuit 53 is further configured to stop the operation of the motor 103 upon receiving a sensor signal indicating that any of the holder elements 2 has reached an end position (i.e., any of the holder elements 2 is positioned close to the corresponding proximity sensor 51, 52). This is a safety feature to avoid the possibility of the traction wire 3 being wound too far, which could, for example, cause the holder element 2 to get caught and damage the motor 103. A user may manually stop the operation of the motor 103 before any of the holder elements 2 reaches its end position.

[0071] 3 to 8b show the structure of the holder element 2 and the arrangement of the pulling wires 3 in the holder element 2. FIG.

[0072] The holder arrangement 1 comprises a stop arrangement 7 configured to hold a first end 8 of a pull wire 3 in position relative to the holder element 2. The holder element 2 encloses the stop arrangement 7. The holder element 2 is provided with first, second and third apertures 9, 10, 12, and the stop arrangement 7 is located inside the holder element 2 at the first aperture 9. The pull wire 3 extends out of the holder element 2 through the first aperture 9 and back into the holder element 2 through the second aperture 10 to form a wire loop between the first aperture 9 and the second aperture 10 outside the holder element 2. The pull wire 3 extends out of the holder element 2 through the third aperture 12 and further extends towards the pull arrangement 107. The pull wire 3 is free to move between the second aperture 10 and the third aperture 12 relative to the holder element 2 such that the loop of the pull wire 3 tightens or contracts when the pull wire 3 is pulled out from the third aperture (12), and such that the loop of the pull wire 3 loosens or expands when the pull wire 3 is pulled out from the second aperture 10.

[0073] In this example, the stop arrangement 7 comprises a ferrule arranged around the curved / folded end of the pull wire 3, which is clamped onto the pull wire 3 so as to be securely attached to the pull wire 3. The ferrule has a diameter, at least in its end region, that is larger than the diameter of the first aperture 9 so as to prevent it from becoming detached from the holder element 2.

[0074] To enable the wire 3 to be mounted within the holder element 2, the holder element 2 comprises first and second connectable portions 3, 4. First and second apertures 9, 10 are located within the first portion 4 and a third aperture 12 is located within the second portion 5. When connected, the two portions 4, 5 completely enclose the stop arrangement 7. The wire 3 may be placed within the holder element 2 before connecting the two portions 4, 5.

[0075] The first and second parts 4, 5 of the holder element 2 are arranged such that a portion of one of the parts (in this example the second part 5) is inserted within the other (in this example the first part 4) when the two parts are pressed together and connected to form the holder element 2. The first and second parts 4, 5 are provided with a pair of complementary circumferentially extending interlocking locking members 61, 62 which engage with each other when the first and second parts 4, 5 are pressed together and connected. This may also be arranged in other ways, for example the holder element 2 may instead be designed such that a portion of the first part 4 is inserted within the second part 5.

[0076] As shown in Figures 4, 6, 7a, and 8b, in this example, the complementary circumferentially extending mating locking members include a flange 61 disposed on the second portion and a groove 62 disposed on the first portion 4. The flange 61 has an inclined surface facing toward the first portion 4 to facilitate passage of the mating locking members 61, 62 when the first and second portions 4, 5 are pressed together. Additionally, the flange 61 has a straight surface facing in the opposite direction (away from the first portion 4) to prevent unintentional passage of the mating locking members 61, 62 after the first and second portions 4, 5 are pressed together and connected. Overall, this simplifies the procedure for connecting the two portions while providing a secure connection.

[0077] As shown in Figure 6, the holder element 2 is provided with a wire guide channel between the second aperture 10 and the third aperture 12, through which the towing wire 3 passes. Part of the wire guide channel is formed by a guide tube 11 connected to the first part 4 and extending towards the second part 5.

[0078] The magnet 6 arranged in the holder element 2 is provided with a through-hole through which the towing wire 3 passes, the through-hole forming part of a wire guiding channel. The magnet 6 is arranged in a recess inside the second part 5 facing the first part 4 of the holder element 2. A guide tube 11 is adapted to hold the magnet 6 in place when the first and second parts 4, 5 are interconnected.

[0079] When connecting to the knob, the loop is initially placed in an expanded configuration with a larger diameter than the knob. The loop is then placed around the knob with the sheet between it and the loop. The loop is then tightened by pulling the wire away from the holder element and knob. This reduces the diameter of the loop and locks the holder configuration in place relative to the sheet and knob.

[0080] Similarly, when connecting to a carabiner, the loop is first positioned in an expanded configuration so that the carabiner can be threaded through the loop. After the carabiner is threaded through the loop, the loop is tightened by pulling the wire away from the holder element and carabiner. This reduces the diameter of the loop and locks the holder configuration in place relative to the carabiner. Figure 13 shows a view of the holder configuration attached to the carabiner and further attached to the opening in the mattress holder.

[0081] The first and second parts 4, 5 may be connected in different ways. In the example holder component illustrated in Figures 6 and 7-8, the first part 4 includes a first rim 19 and the second part 5 includes a second rim 13. The second rim has a smaller circumference than the first rim, and the second part is press-fit into the first part. In the example shown, a mating locking feature is added. Alternatively, each rim may be threaded, and the two parts may be threaded together. The two parts may be held together by one or more screws, bolts, etc. Preferably, the two parts are releasably attached to each other.

[0082] When the first and second parts 4, 5 are interconnected, they enclose the stop arrangement 7. In other words, one or both of the parts contains the stop arrangement 7. The stop arrangement is thereby contained within an interior volume defined by the first and / or second parts.

[0083] An important aspect of any equipment used in a hospital or similar environment is cleanliness. The holder configuration 1 of the present disclosure includes a few simple parts that are easy to manufacture and easy to clean. The stop configuration 7 can be a place for dust to accumulate. Furthermore, the stop configuration can be difficult to clean. Therefore, encapsulating the stop configuration makes the holder configuration of the present disclosure easy to clean.

[0084] Each of the first aperture 9, second aperture 10, and third aperture 12 may be sized to allow the pull wire 3 to fit snugly within the respective aperture. For example, the diameter of the aperture may be as much as 10% larger than the diameter of the pull wire. This reduces the amount of dust that can enter the holder element 2. Optionally, one or more of the apertures includes a gasket or seal that further seals any space around the pull wire against the inner surface of the aperture. Such a seal may be a brush seal. Furthermore, because the first end 8 of the pull wire is held in place relative to the first aperture 9, the first aperture may be configured to allow the pull wire to fit snugly within the first aperture compared to the other apertures. The second aperture 10 and third aperture 12 are preferably configured to allow the pull wire to pass relatively unimpeded through them, allowing for larger or smaller loops.

[0085] The holder element 2 preferably has a rounded shape. This reduces the accumulation of dust on the holder element. The rounded shape also reduces degradation of surfaces on which the holder element slides, such as the surrounding mattress, sheets, and plastic materials. In the example holder element of FIG. 3, the first and second portions 4 and 2 each have a truncated cone shape extending in the direction in which the tow wire 3 extends from the third aperture 12. In addition, the holder element 2 preferably has a rounded shape to provide low friction when the holder element slides over a surface. Furthermore, the first portion 4 may include flat portions 23, as illustrated in the example of FIG. 7b, which also provide low friction. These flat portions are arranged at an angle with respect to the direction in which the tow wire extends from the third aperture.

[0086] The patient transfer device 101 of the present disclosure may comprise a traction arrangement 107 provided with a receiving member (not shown) configured to receive the holder element 2, the receiving member having a complementary shape to the second portion 5 of the holder element 2. In FIG. 1 , each receiving member may be positioned on the casing 104 in association with a wire bobbin 108. Proximity sensors 51, 52 may be arranged in association with the receiving member.

[0087] As shown in FIG. 7b, the first part 4 of the holder configuration 2 may have a front surface 20 in which the first and second apertures 9 and 10 are arranged. The tow wire may apply pressure to the front surface 20 when the loop is in its smallest configuration, i.e., when the tow wire is maximally wound from the holder element without being connected to the knob. In some cases, there may be a very small gap between the front surface and the tow wire. In either case, it may be difficult for an operator of the holder configuration to grasp the tow wire in order to increase the loop size before connecting it to the knob or carabiner. Therefore, as shown in FIG. 7b, the first surface may be provided with a protrusion 21 disposed between the first and second apertures and extending from this first surface. This protrusion is configured to provide a (larger) gap between the tow wire and the front surface when the loop is in the aforementioned smallest configuration. Thus, the protrusion facilitates grasping the tow wire, thereby facilitating use of the holder configuration. The protrusions may have an extended length of, for example, 0.2 to 2 times the diameter of the pull wire.

[0088] The front surface 20 may be positioned to apply pressure to the knob when a sheet is positioned between the front surface and the knob. In other words, the front surface may be positioned to abut the knob when a sheet is positioned between the front surface and the knob. The front surface may also be positioned to apply pressure to the carabiner. Therefore, the front surface preferably has a shape complementary to the corresponding surface of the knob and / or the corresponding surface of the carabiner that the front surface may abut. This further secures the holder arrangement to the carabiner or knob when a sheet is positioned between the knob and the front surface. In particular, the front surface 20 may be semicircular. Figure 7b shows an example of a semicircular front surface 20 between the ends 22. Additionally or alternatively, the front surface may have a rounded protruding surface configured to mate with the corresponding rounded shape of the knob groove 18 in the base 16 of the knob 14. In other words, the inner edge of the front surface is a rounded convex surface.

[0089] FIG. 2 shows an example of a knob 14. The knob of the sheet member illustrated in any drawing in this disclosure may be the example of the knob shown in FIG. 2. In FIG. 2, the knob is provided with a head 15 and a base 16. The base has a circular cross section, with the head 15 being larger than the base 16. The base is provided with a circumferentially rounded knob groove 18. The groove is recessed and adapted to cooperate with the loop of the holder arrangement. In one example, the height of the groove 18 is equal to the diameter of the pull wire. However, this height is preferably slightly larger than the diameter, e.g., at least 10%, more preferably at least 20% larger. This allows the sheet to be clamped so that it fits snugly between the groove and the loop. A relatively large contact surface exists between the sheet and the holder arrangement, which reduces the risk of the sheet slipping off or tearing during transfer of the patient from one surface to another. Furthermore, the diameter of the groove is preferably greater than three times the diameter of the pull wire. This ensures that the sheet is clamped tightly between the loop and the groove, thereby reducing the contact load on the sheet. In the example of Figures 3-7b, the tow wire has a diameter of 3mm and the groove 18 has a height of 6mm.

[0090] The wire loop size of the holder configuration is reconfigurable, allowing the holder configuration to be used with knobs of different sizes without modification, providing versatility. Additionally, when a sheet is attached to the holder configuration, the sheet does not fold uniformly over the knob. Therefore, the holder configuration can be used to hold sheets of various materials and thicknesses that fold in different ways and therefore have different effective diameters for the knob-sheet combination.

[0091] The knob is preferably made of a rigid material such as reinforced plastic. The holder element 2 may also be made of a rigid material, but may be somewhat elastic and made of elastic plastic or rubber. Advantageously, the holder element, the tow wire, the sheet member, and / or the mattress member are made of a material that is transparent to electromagnetic waves in frequency spans typically used by machinery in hospital facilities. Examples of such frequency spans are 10-500 kHz, 10-80 MHz, and 80 MHz-3 GHz. This allows for applicability and interoperability in hospital environments, and little or no disturbance to the output of radioactive machines. In this way, the holder arrangement does not need to be removed when the patient is undergoing a radiological examination.

[0092] 9a-9d show the attachment of a sheet to a holder arrangement, where the sheet member 17 is a rod with at least one knob 14. FIG. 9a shows a portion of the sheet member with the knob. In FIG. 9b, a sheet 116 is placed on the knob 14 of the sheet member. In FIG. 9c, the holder arrangement is moved toward the knob on which the sheet is placed. The holder element is then positioned above the knob and pressed down so that the loop spreads over the head 15 of the knob. At this stage, the diameter of the loop is larger than the diameter of the head of the knob. At the same time, the sheet is pressed down onto the knob and is somewhat pulled together by the loop. In FIG. 9d, the knob and holder arrangement are locked. The second end of the pull wire is pulled away from the holder arrangement 2 and the knob so that the loop closes in the groove 18 and the sheet is tightly pressed and held between the loop and the groove.

[0093] 14a-14d show the attachment of a sheet to a holder arrangement, where the sheet member 17 is a longitudinally extending elongated member having two knobs 14 spaced apart from each other in the longitudinal direction, the knobs extending in the longitudinal direction. FIG. 14a shows the sheet member on the sheet. In FIG. 14b, the sheet 116 is folded over the knobs 14 of the sheet member. In FIG. 14c, each holder arrangement is moved toward the respective knob on which the sheet is placed. Furthermore, each holder element is positioned next to the knob and pressed against the knob so that the loops extend over the knob head 15. At this stage, the diameter of each loop is larger than the diameter of the head of the corresponding knob. In FIG. 14d, each knob and the corresponding holder arrangement are in a locked state. The second end of each pull wire is pulled away from the corresponding holder element 2 and knob so that the respective loop is tightened and the sheet is tightly pressed and held between the respective loop and knob.

[0094] Also disclosed is a system comprising the patient transfer device 101 described above and a mattress and / or sheet member 17 attachably arranged on the mattress 201.

[0095] 15-16 show a more detailed example of the arrangement of one of the proximity sensors 51, 52 on the patient transfer device 101. In this example, the proximity sensor 51 is a Hall effect sensor that is able to detect a magnet 6 arranged in the holder element 2 when the magnet 6 comes close enough to the sensor 51. The sensor 51 is arranged on the edge of a circuit board (not shown) and protrudes through a hole 56 in the casing 104, thereby positioning it above the top surface of the casing 104 (6 mm above in this example).

[0096] A wire guide 55 is arranged above and around the proximity sensor 51, and this wire guide 55 also acts as a receiving portion for the holder element 2. The wire guide 55 is open toward the holder element 2 and has a shape that matches the shape of the holder element 2 so as to receive and contain part of the holder element 2. A recess 57 for accommodating the sensor 51 is provided on the lower side of the wire guide 55. In this case, the recess 57 has a depth / height of 7 mm and a sufficient diameter to provide space for the proximity sensor 51 protruding upward. The wire guide 55 is attached to the upper surface of the casing 104 by screws.

[0097] This arrangement allows the holder element 2, and thus the magnet 6, to come very close to the sensor 51 when it reaches an end position in the wire guide 55. As a result, a relatively small magnet 6 can be used without the risk that its presence in the end position will not be detected by the proximity sensor 51. This has the effect of making it possible to reduce the size of the holder element 2.

[0098] Sensor configurations consistent with the configuration illustrated in Figures 15-16 are also suitable for other types of sensors, such as where the sensor is capable of detecting a piece of iron placed within a holder element. [Explanation of symbols]

[0099] 1: Holder configuration 2: Holder element 3: Towing wire 4: 1st part 5:Second part 6: Magnet 7: Fastener configuration 8:First end 8': 2nd end 9: Aperture 10:Aperture 11: Guide pipe 12:Aperture 13: Rim 14: Nobu 15: Head 16: Base 17: Sheet material 18: Knob groove 19: Rim 20:Front 21: Convex 22:End 23: Inclined surface 51: First proximity sensor 52: Second proximity sensor 53: Control circuit 55: Receptacle for wire guide / holder element 56: Casing through hole 57: Recess for proximity sensor 61: Flange 62: Groove 101: Patient transfer device 102: Frame 103: Motor 104: Casing 105: Wheel 106: Vertical Track 107: Towing configuration 108: Bobbin 111: Arm 112: Wall 113: 1st surface 114: Reception area 115: Bed 116: Sheets 117:Patient 201: Mattress 202: Mattress material 203: Mattress holder 204: Opening 205: Carabiner

Claims

1. A patient transfer device (101) for transferring a patient positioned on a sheet (116) or mattress (201) from a first surface to a receiving surface, comprising: At least one retractable towing wire (3); a towing arrangement (107) including a motor (103) operably connected to the towing wire (3), the motor (103) enabling winding of the towing wire (3); a holder arrangement (1) for holding the sheet (116) or the mattress (201) when moving the sheet (116) or the mattress (201) and thereby transporting the patient placed on the sheet (116) or the mattress (201); The holder arrangement (1) comprises a holder element (2) to which a first end (8) of the towing wire (3) is attached, the traction arrangement (107) is configured to wind the traction wire (3) and consequently move the holder arrangement (1) and the holder element (2) toward the traction arrangement (107) so as to move the sheet (116) or the mattress (201) toward the traction arrangement (107) when the holder arrangement (1) is arranged to hold the sheet (116) or the mattress (201), thereby transferring the patient placed on the sheet (116) or the mattress (201) from the first surface to the receiving surface, The patient transfer device (101) is provided with proximity sensors (51, 52) in the towing configuration (107) configured to detect whether the holder element (2) has reached an end position in or near the towing configuration (107).

2. the patient transfer device (101) is provided with a control circuit (53) configured to control operation of the motor (103) in response to sensor signals received from the proximity sensors (51, 52); 2. The patient transfer device (101) of claim 1, wherein the control circuit (53) is configured to stop operation of the motor (103) upon receiving a sensor signal indicating that the holder element (2) has reached the end position.

3. The patient transfer device (101) according to claim 1 or 2, wherein the proximity sensor (51, 52) is configured to sense the presence or change of an electromagnetic field or beam of electromagnetic radiation.

4. the proximity sensors (51, 52) are configured to sense the presence or change of a magnetic field, such as a Hall effect sensor; A patient transfer device (101) according to any of claims 1 to 3, wherein said holder element (2) is provided with a magnet (6).

5. the holder arrangement (1) comprises a stop arrangement (7) configured to hold the first end (8) of the pull wire (3) in position relative to the holder element (2); The patient transfer device (101) according to any of claims 1 to 4, wherein said holder element (2) encloses said stop arrangement (7).

6. The holder element (2) is provided with a first aperture (9), a second aperture (10) and a third aperture (12); 6. The patient transfer device (101) according to claim 5, wherein the stop arrangement (7) is arranged inside the holder element (2) at the first aperture (9).

7. 7. The patient transfer device (101) of claim 6, wherein the pull wire (3) extends out of the holder element (2) through the first aperture (9) and back into the holder element (2) through the second aperture (10) so as to form a loop between the first aperture (9) and the second aperture (10) outside the holder element (2).

8. 8. The patient transfer device (101) according to claim 6 or 7, wherein the traction wire (3) extends out of the holder element (2) through the third aperture (12) and further towards the traction arrangement (107).

9. 9. A patient transfer device (101) according to claims 7 and 8, wherein the pull wire (3) is free to move between the second aperture (10) and the third aperture (12) relative to the holder element (2) such that the loop of the pull wire (3) tightens or contracts when the pull wire (3) is pulled out of the third aperture (12), and such that the loop of the pull wire (3) loosens or expands when the pull wire (3) is pulled out of the second aperture (10).

10. the holder element (2) comprises a first part (4) and a second part (5), the first aperture (9) and the second aperture (10) being arranged in the first part (4); 7. A patient transfer device (101) as described in claims 5 and 6, wherein the third aperture (12) is arranged within the second part (5), and the first part (4) is arranged to interconnect with the second part (5) so that when connected, the first part and / or the second part enclose the stop arrangement (7).

11. the first and second parts (4, 5) of the holder element (2) are arranged such that a portion of one of the parts (5) is inserted into the other (4) when the first and second parts (4, 5) are pressed together and connected to form the holder element (2); 11. A patient transfer device (101) as claimed in claim 10, wherein the first part (4) and the second part (5) are provided with a pair of complementary circumferentially extending interlocking locking members (61, 62) that engage with each other when the first part (4) and the second part (5) are pressed together to connect them.

12. the complementary circumferentially extending mating locking members include a flange (61) and a groove (62); The flange (61) has an inclined surface oriented to facilitate the passage of the mating locking members (61, 62) when the first part (4) and the second part (5) are pressed together, 12. A patient transfer device (101) as described in claim 11, wherein the flange (61) has straight faces facing in opposite directions to prevent unintentional passage of the mating locking members (61, 62) when the first part (4) and the second part (5) are pressed together and connected.

13. 6. The patient transfer device (101) according to claim 5, wherein the stop arrangement (7) comprises a knot formed by the pull wire (3) and / or a stop member attached to the pull wire (3).

14. The stop arrangement (7) comprises a ferrule disposed around the pull wire (3), The ferrule is clamped onto the pull wire (3) so as to be securely attached to the pull wire (3); 7. The patient transfer device (101) of claim 6, wherein the ferrule has a diameter greater than the diameter of the first aperture (9) over at least a portion of its length.

15. The holder element (2) is provided with a wire guide channel through which the towing wire (3) passes, the wire guiding channel extends between the second aperture (10) and the third aperture (12); 11. A patient transfer device (101) according to claim 10, wherein part of the wire guide channel is formed by a guide tube (11) connected to the first part (4) and extending towards the second part (5).

16. A patient transfer device (101) according to any of the preceding claims, wherein the holder element (2) comprises a magnet (6).

17. 17. The patient transfer device (101) according to claim 16, wherein the magnet (6) is provided with a through hole through which the traction wire (3) passes.

18. the magnet (6) is arranged inside the second part (5) of the holder element (2) facing the first part (4), 18. A patient transfer device (101) as claimed in claims 15 and 17, wherein the guide tube (11) is adapted to hold the magnet (6) in place when the first part (4) and the second part (5) are interconnected.

19. The patient transfer device (101) according to any of the preceding claims, wherein said holder element (2) is made from a polymer material such as a plastic or rubber material.

20. The traction arrangement (107) comprises a wire bobbin (108) connected to the motor (103); The patient transfer device (101) of any of claims 1 to 19, wherein the proximity sensor is positioned relative to the wire bobbin (108).

21. A patient transfer device (101) as described in any one of claims 1 to 20, wherein the proximity sensors (51, 52) protrude through holes (56) in the casing (104) so ​​as to be positioned at least partially above an upper surface of the casing (104) of the traction arrangement (107).

22. Components (55), such as wire guides and / or receptacles of the holder element (2), are arranged above and around the proximity sensor (51), 22. A patient transfer device (101) as described in claim 21, wherein the lower side of the component (55) is provided with a recess (57) configured to provide space for and accommodate the protruding portion of the proximity sensor (51, 52).

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