• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a welding apparatus (10; 30) having a safety feature comprising: two electrodes (11, 12; 21, 22), whereof at least one of said two electrodes is movably arranged in relation to the other electrode. The electrodes are in non-contact with each other and define a gap (13) in which an object (14) provided with an electrically non-conductive surface to be sealed may be inserted. The welding apparatus comprises an actuator (15; 25) configured to move at least one electrode when activated to squeeze the object, a detector (16; 26) configured to determine a clamping force when the inserted object (14) is squeezed between the electrodes, a distance sensor (17; 23) configured to measure the distance between the electrodes. There is also a conductance sensor (20) configured to measure the conductivity of an object located between the electrodes (11, 12; 21, 22) when the object (14) is squeezed, and optionally a position sensor (19b) configured to detect the position of the object (14) inserted between the electrodes. The welding apparatus further comprises a processor configured to process the input from at least the detector (16; 26), the distance sensor (17; 23) and the conductance sensor (20) to provide an output that indicates if there is a blood bag tube inserted between electrodes, or if it is a foreign object. The processor comprises a memory storing threshold values for distance, and conductance in memory, whereby the output from the processor is a comparison of sensor outputs with the stored threshold values. The processor further comprises a memory storing clamping force profiles for various material types, whereby the output from the processor is a comparison of detector output with the stored profiles.
    公开号:SE1651178A1
    申请号:SE1651178
    申请日:2016-09-02
    公开日:2018-03-03
    发明作者:Jansson Per
    申请人:Conroy Medical Ab；
    IPC主号:
    专利说明:

    A WELDING APPARATUS Technical field The present invention relates generally to welding apparatuses for plastic welding,more particularly for plastic tubes, and specifically it relates to a safety feature for preventing injury to operators.Background to the invention Welding apparatuses are normally used for sealing different containers designed tocontain blood, such as blood bags or tubes connected to blood bags. Due to theplastic material used to manufacture blood bags and tubes, ultrasound or RFwelding techniques are commonly used; such equipment is provided by the applicant and shown in Figure 1.
    Blood bags and tubes come in many different sizes and shapes, which in turnrequire the user to have access to different welding equipment adapted for a specificmaterial, shape or thickness. Typically, a user has to seal the plastic tube when theblood bag is full, but may also have to seal of a part of the blood bag for testsamples, which requires the user to have access to different welding equipment to perform the required tasks.
    When sealing different containers designed to contain blood, such as blood bags,welding techniques (ultrasound or RF) are normally used. Such a product (CS546Qseal-handy) is provided by Conroy Medical, and is shown in Fig. 1. It comprises abattery pack 2 (i.e. a DC source), a device for welding 1, which is normally hand-held, and a cord / cable 3 for connecting the battery pack with the hand-held device.The device can also be powered from the AC mains via a suitable cord. The Qseal-handy is a fully automatic system for sealing PVC and EVA tubes connected toblood bags included either in Blood Packs or in Apheresis Disposable Sets. Thesealing can be performed when the donor is still connected to the Blood Pack or the Apheresis Disposable Set.
    The prior art devices can distinguish between different tubes (e.g.thickness / diameter, material resilience etc.), but do not have the ability to detect whether e.g. a finger is inadvertently inserted in the welding area between electrodes. In view of the high energies used for welding human tissue can potentially be severely damaged in such instances.
    Thus, there is a need to develop a welding apparatus that can distinguish e.g.human tissue in the form of a finger from plastic tubes, and to abort operation if such detection is made.Summary of the invention The object with the present invention is to provide a welding apparatus which has a safety feature that prevents operator injury.The object may be achieved with a welding apparatus comprising: The benefit and advantage over prior art with the invention is that tampering with the welder cannot cause severe burn damage to operators of the apparatus.
    Further objects and advantages will be apparent for a skilled person from the detailed description and the dravvings.
    Brief description of the drawings Fig. 1 shows a prior art welding apparatus; Fig. 2 shows a cordless prior art welding apparatus; Fig. 3 shows a first embodiment of a welding apparatus; Fig. 4 shows a second embodiment of a welding apparatus; Fig. 5 shows an embodiment of a conductance measurement device; Fig. 6 shows a flow chart describing a method to perform a welding procedure; and Fig. 7 shows a flow chart describing operation of a welding procedure featuring a safety aspect;Detailed description of the preferred embodiments Figure 1 illustrates a prior art welding apparatus having a welding unit 1 attached via a cord 2 to a battery pack 3.
    Figure 2 illustrates a cordless welding apparatus comprising two parts, a first unitin the form of a power unit 5 with a battery pack, and a second unit in the form of a welder 4. The power unit is inserted in a slot in the handle 6 of the apparatus.
    As previously mentioned, a drawback of the prior art welding apparatuses is thatthey have no safety system for avoiding operator injury due to inadvertent and inappropriate tampering with the welder.
    Figure 3 shows a first embodiment of a welding apparatus 10 comprising twoelectrodes 1 1, 12, an actuator 15, an energi source 20, a clamping force detector16, a distance sensor 17 configured to measure the distance between the electrodeswhen the object is squeezed, a conductance sensor 24 configured to measure theconductance between the electrodes when the object is squeezed, and a processor18 configured to determine if there is a proper object, e.g. blood bag tube insertedbetween electrodes, or if it is a foreign object, e.g. a finger, based on input from at least one of detector 16 and sensors 17, 24.
    Now operation of the welder will be described in general, and specifically the safety feature will be described, with reference to Fig. 3.
    A first of the electrodes 1 1 is movably arranged in relation to the other electrode 12,which is stationary, and the two electrodes are in non-contact with each other. Agap 13 is defined between the electrodes in which gap an object 14 to be sealed maybe inserted. An object 14 which is to be welded, such as plastic tubes or plasticbags, is provided with an electrically non-conductive surface, and is typically manufactured from an electrically non-conductive material.
    When activated, the actuator 15 (e.g. a step motor, brushless DC motor, etc.) isconfigured to move the first electrode 11 towards the other electrode 12 to close thegap 13 when the object 14 is inserted within the gap 13. The energi source 20 isconfigured to provide energy to the electrodes to perform a welding procedureprovided that a control signal 34 from the processor 18 is received that controls the time and/ or energy needed to perform the welding procedure.
    In order to calculate the time and/ or energy needed to perform the weldingprocedure, information regarding the object needs to be collected. The clamping force detector 16 is configured to determine a clamping force and the distance sensor 17 is configured to measure a distance between the electrodes when theinserted object 14 is squeezed between the electrodes 11, 12. The clamping forcemay be determined by detecting the clamping force or by calculating the clamping force based on power consumption (current and voltage to a DC motor) The determined clamping force and the measured distance are indicators regardingwhat type of properties the object has, i.e. tube or sheet; thickness and type ofmaterial. More particularly, the clamping force Fdamp is recorded as a function ofdisplacement of the moving electrode, i.e. distance between electrodes (or someequivalent relative measure of position in space or time). Thus, the force Fdamp willhave a certain profile for a certain material, depending on the resilience/ rigidity of the material.
    The processor calculates time and/ or amount of energy required to perform thewelding procedure on the inserted object based on the determined clamping force profile and measured distance between the electrodes.
    The processor 18 is provided with a memory in which data corresponding toclamping force profiles for different materials, and for performing controlled weldingbased on input data from detecot and sensors. Thus, the processor retrieves datafrom the memory regarding an appropriate welding procedure as a function ofclamping force and distance between the electrodes. The data is preferably stored ina look-up table. Furthermore, separate look-up tables may be implemented fordifferent materials, and information regarding which material the object is madefrom can be obtained from a user, e.g. using a built-in bar-code reader 27 thatreads the information from a barcode 28 and a signal 29 with the information isforwarded to the processor 18 to select the correct look-up table to be used for the welding procedure.
    Furthermore, the welding apparatus 10 may be provided with a wirelesscommunication interface, such as a transceiver circuitry 39, to facilitate wirelesscommunication with external equipment, such as a computer, to exchangeinformation. This type of information may comprise updated data to be stored in thelook-up tables, and also data to be stored in a new look-up table, to adapt and thereby optimize the welding procedure. Information regarding the type of material in the object inserted in the gap may also be provided to the processor via the Wireless communication interface.
    The distance sensor 17 is configured to measure the distance between theelectrodes by monitoring the movement of the first electrode 1 1 in relation to theother electrode 12. In this embodiment, this is achieved by a sensor arranged tomonitor the movement of a rod 15b controlled by the actuator 15 which is attached to the first electrode 11.
    Optionally, a further sensor 19a may be provided to detect if the object 14 is partlyoutside the defined gap 13, and the processor 18 is in this case further configuredto prevent the actuator 15 to be activated when the object 14 is detected to bepartly outside the defined gap 13. Thus, preventing a poor weld on the object 14.
    The detection of a very thin material (based on the measured distance between theelectrodes) outside the gap 13 may also be used to confirm that the object is a plastic sheet and ensure that a proper welding procedure is used.
    Optionally, an additional position sensor 19b is provided to detect the position ofthe object 14 inserted between the electrodes, and the processor 18 is in this casefurther configured to enable said actuator 15 to be activated when the additionalposition sensor detects that the object is placed between the electrodes 1 1, 12.Thus, the signal from the additional position sensor prevents the welding procedurefrom being activated when no object is inserted between the electrodes. The signalfrom the additional position sensor may also be used as an indication that theactuator should be activated, whereby a separate button 31 as discussed below is not required.
    The energy source 20 may comprise a battery which is activated by a control signal34 from the processor 18. When the actuator 15 is activated, either by pressing abutton 31 or by detecting the presence of an object in the gap 13, the gap isreduced. In case where the second sensor 19a and/or third sensor 19b isimplemented, signals 32 and 33 are forwarded to the processor, which sends anenable signal (as indicated by 36) to the actuator before it may be activated. Whenthe object 14 (inserted between the electrodes) is squeezed, the processor 18 receives signals from the clamping force detector 16 (as indicated by 36) and the first sensor 17 (as indicated by 35). The processor 18 thereafter calculates the required time and/ or energy needed to perform the welding procedure.
    Figure 4 shows a second embodiment of a welding apparatus 30 comprising twoelectrodes 21, 22, an actuator 25, an energf source 20, a clamping force detector 26, a distance sensor 23, a conductance sensor 24 and a processor 18.
    In this embodiment, each electrode 21, 22 are movable in relation to the other andthe movement is controlled by the actuator 25, and the two electrodes are in non-contact with each other. A gap 13 is defined between the electrodes in which anobject 14 to be sealed may be inserted. The object 14, such as plastic tubes orplastic bags, is provided with an electrically non-conductive surface, and is typically manufactured from an electrically non-conductive material.
    The actuator 25 is configured to move the first electrode 21 and second electrode 22towards each other to close the gap 13 when the object 14 is inserted within the gap13. The energf source 20 is configured to provide energf to the electrodes toperform a welding procedure provided that a control signal 34 from the processor 18 is received that controls the time and/ or energf needed to perform the welding procedure.
    In order to calculate the time and/ or energy needed to perform the weldingprocedure, information regarding the object needs to be collected. The clampingforce detector 26 is configured to determine a clamping force and the distancesensor 23 is configured to measure a distance between the electrodes when theinserted object 14 is squeezed between the electrodes 21, 22. Information regardingtype of material may be obtained using a bar-code reader (not shown) or through awireless communication interface as previously discussed in connection with figure 3.
    The determined clamping force and the measured distance are indicators regardingwhat type of properties the object has, i.e. tube or sheet; thickness and type ofmaterial, but external information provided by a bar-code reader or through awireless communication interface may also be provided. The processor calculatestime and/ or amount of energy required to perform the welding procedure on theinserted object based on the determined clamping force and measured distance between the electrodes, as described above.
    In this embodiment, the distance sensor 23 is an optical rangefinder configured tomeasure the distance between the electrodes by monitoring the movement of one electrode in relation to the other electrode using light.
    Optionally, a further sensor (not shown) may be provided to detect if the object 14 ispartly outside the defined gap 13, and the processor 18 is in this case furtherconfigured to prevent the actuator 25 to be activated when the object 14 is detectedto be partly outside the defined gap 13. Thus, preventing a poor weld on the object 14. The second sensor may be integrated into the first sensor 23.
    Optionally, an additional position sensor (not shown) is provided to detect theposition of the object 14 inserted between the electrodes, and the processor 18 is inthis case further configured to enable said actuator 25 to be activated when thethird sensor detects that the object is placed between the electrodes 21, 22. Thus,the signal from the additional position sensor prevents the welding procedure to beactivated when no object is inserted between the electrodes, and the signal may also be used to activate the actuator instead of using a separate button 31.
    According to the invention there is also provided a conductance sensor 24 which isconfigured to measure the conductance between the electrodes when an object inserted in the gap between the electrodes is squeezed.
    Thus, a welding apparatus having a safety feature comprises at least one of a) adetector 16 configured to determine a clamping force when the inserted object issqueezed between the electrodes, b) a distance sensor 17 configured to measure thedistance between the electrodes when the object is squeezed, c) a conductancesensor 24 configured to measure the conductance between the electrodes when theobject is squeezed. The apparatus also comprises a processor configured to processthe input from at least one of the detector and sensors to provide an output thatindicates if there is a proper object (e.g. a blood bag tube) inserted between electrodes, or if it is a foreign object (e.g. a finger).
    The conductance sensor 24 can be implemented by connecting an Ohm-meteracross the electrodes, as shown in Fig. 6. Conductance (G, in Siemens) is the reciprocal of Resistance (R), i.e. G = 1 /R. Thus, conductance is easily calculated.
    Since the objects intended for use in the welding apparatus have low conductance,e.g. plastic tubes, a conductance measurement Will be an excellent means fordistinguishing between tubes and e.g. human tissue (skin) which exhibits a conductance orders of magnitude larger.
    For the same reason the clamping force exerted will differ between tubes and otherobjects. Also, the diameter of a tube is significantly smaller than that of e.g. afinger, and thus the output of the distance sensor can also be used for this purpose.
    However, the optimal assessment is based on a combination of all outputs from detector/ sensors.In Fig. 5 a preferred embodiment of a conductance sensor is shown.
    It comprises an Ohm-meter 50 coupled to the electrodes 1 1, 12 (or 21, 22). Whenthere is a gap between the electrodes, i.e. no object present, the conducactance G isof course zero (R = oo ; G = 1/R ), and if an object 14 exhibiting non-zeroconductance a signal will be sent to the processor 18. Any other set-up for measuring conductance is of cores equally possible and is within the inventive idea.
    The energy source 20 may comprise a battery which is activated by a control signal34 from the processor 18. When the actuator 25 is activated, either by pressing abutton 31 or by detecting the presence of an object in the gap 13, the gap isreduced. In case where the second sensor and/ or third sensor is implemented,signals are forwarded to the processor 18, which sends an enable signal (asindicated by 38) to the actuator before it may be activated. When the object 14(inserted between the electrodes) is squeezed, the processor 18 receives signals fromthe clamping force detector 26 (as indicated by 38) and the first sensor 23 (asindicated by 37). The processor 18 thereafter calculates the required time and/ or energy needed to perform the welding procedure.
    The processor 18 in figures 3 and 4 may further be configured to calculate timeand/ or amount of energy required to perform the welding procedure when thedetermined clamping force exceeds a predetermined value to ensure that the object is sufficiently squeezed before the welding procedure commences.
    The processor 18 is also configured to compare any of the properties measured bymeans of the detector/sensors with a threshold value for each property. Saidthreshold values are selected so as to guarantee that the welder always will beoperable for the intended materials, and always will be in-operable if e.g. a finger is inserted in the gap.
    Figure 6 shows a flow chart describing a method to perform a welding procedure in general.
    The flow starts at step 40, and an object 14 with an electrically non-conductivesurface is placed in a gap13 between two electrodes 11, 12; 21, 22 in step 41. The actuator 15, 25 is activated in step 42 to move at least one of the electrodes 11; 21, 22 in relation to the other electrode to squeeze the object 14 between the electrodes.
    In step 43, a clamping force is determined when the object 14 is squeezed betweenthe electrodes 11, 12; 21, 22, and a distance between the electrodes when the object 14 is squeezed between the electrodes 11, 12; 21, 22 is measured in step 44.
    The time and/ or energi required to perform the welding procedure on the insertedobject 14 is calculated in the processor 18 in step 45 based on the determinedclamping force and the measured distance between the electrodes, and the energyemitted from the energy source 20 is controlled by the processor 18 based on the calculated time and/ or energf in step 46.
    In step 47, energy is provided from the energi source and controlled by theprocessor 18 to said electrodes to perform the welding procedure, and the flow is completed in step 48.
    Step 45 may further comprise calculating time and amount of energy required toperform the welding procedure when the determined clamping force exceeds apredetermined value to ensure that the object is sufficiently squeezed before the welding procedure commences.
    The welding techniques that are commonly used for welding plastic tubes andsheets are dielectric welding using RF energy, or alternatively ultrasound welding,but other types of welding techniques may be implemented in the welding apparatus according to the invention.
    Fig. 7 shows the safety aspect in flow chart form.
    Thus, an object is p1aced in the gap (either an appropriate object, such as a tube, orsome object that is not appropriate, such as a finger). The actuator is activated soas to start squeezing the object between e1ectrodes. In the process c1amping force,distance and conductance are measured. If the measured values are higher thanthe set thresho1d value for the property in question, indicating that it is not a p1astic tube, operation is terminated, i.e. no Welding can be initiated.
    If on the other hand the measured values are Within the acceptab1e range (i.e. lowerthan the thresho1d value) Welding is begun as soon as the other required conditions are met.
    权利要求:
    Claims (10)
    [1] 1. A welding apparatus (10; 30) having a safety feature, comprising:- two electrodes (11, 12; 21,22), whereof at least one of said two electrodes(1 1; 21, 22) is movably arranged in relation to the other electrode, said twoelectrodes are in non-contact with each other and def1ne a gap (13) in which anobject (14) to be sealed and having an electrically non-conductive surface may beinserted,- an actuator (15; 25) configured to move said movably arranged electrode(1 1; 21, 22) when activated, so as to squeeze the object (14) when inserted in thegap (13), and- an energf source (20) configured to provide energy to said electrodes toperform a welding procedure,c h a r a c t e r i z e d i n that said welding apparatus (10; 30) further comprises atleast one of:1) a detector (16; 26) configured to determine a clamping force when theinserted object (14) is squeezed between the electrodes (11, 12; 21, 22),2) a distance sensor (17; 23) configured to measure the distance betweenthe electrodes when the object (14) is squeezed,3) a conductance sensor (20) configured to measure the conductivity of anobject located between the electrodes (11, 12; 21,22) when the object (14) issqueezed,and in that the welding apparatus comprisesa processor configured to process the input from at least one of the detectorand sensors to provide an output that indicates if there is a blood bag tube inserted between electrodes, or if it is a foreign object.
    [2] 2. The apparatus according to claim 1, wherein the processor stores thresholdvalues for distance, and conductance in memory, whereby the output from the processor is a comparison of sensor outputs with the stored threshold values.
    [3] 3. The apparatus according to claim 1 or 2, wherein the processor storesclamping force profiles for various material types, whereby the output from the processor is a comparison of detector output with the stored prof1les. 12
    [4] 4. The welding apparatus according to claim 1, wherein said first sensor (17,23) is configured to measure the distance between the electrodes by monitoring the movement of the at least one electrode (1 1; 21, 22) in relation to the other electrode.
    [5] 5. The welding apparatus according to any of claims 1-4, wherein said distance sensor (17; 23) is an optical rangefinder.
    [6] 6. The welding apparatus according to any of claims 1-5, wherein a furthersensor (19a) is provided to detect if the object is partly outside the defined gap (13),and said processor (18) is further configured to prevent the actuator (15; 25) to be activated when the object (14) is detected to be partly outside the defined gap (13).
    [7] 7. The welding apparatus according to claim 6, wherein said further sensor is integrated into said distance sensor (23).
    [8] 8. The welding apparatus according to any of claims 1-7, wherein a positionsensor (19b) is provided to detect the position of the object (14) inserted between theelectrodes, and said processor (18) is further configured to enable said actuator (15;25) to be activated when the position sensor detects that the object is placedbetween the electrodes (11, 12; 21, 22).
    [9] 9. The welding apparatus according to claim 8, wherein said actuator (15; 25) is activated when said position sensor (19b) detects an object Within the gap (13).
    [10] 10. The welding apparatus according to any of claims 1-9, wherein at least one of said electrodes (12) is stationary. 1 1. A welding apparatus (10; 30) having a safety feature, comprising: - two electrodes (11, 12; 21,22), whereof at least one of said two electrodes(11; 21, 22) is movably arranged in relation to the other electrode, said twoelectrodes are in non-contact with each other and define a gap (13) in which anobject (14) to be sealed and having an electrically non-conductive surface may beinserted, - an actuator (15; 25) configured to move said movably arranged electrode(11; 21, 22) when activated, so as to squeeze the object (14) when inserted in the gap (13), and 13 - an energf source (20) configured to provide energy to said electrodes toperform a welding procedure,c h a r a c t e r i z e d i n that said welding apparatus (10; 30) further comprises atleast one of: 1) a detector (16; 26) configured to determine a clamping force when theinserted object (14) is squeezed between the electrodes (11, 12; 21, 22), 2) a distance sensor (17; 23) configured to measure the distance between the electrodes when the object (14) is squeezed, 3) a conductance sensor (20) configured to measure the conductivity of an object located between the electrodes (11, 12; 21,22) when the object (14) is squeezed,and optionally a position sensor (19b) configured to detect the position of the object (14) inserted between the electrodes,and in that the welding apparatus comprises a processor configured to process the input from at least the detector (16;26), the distance sensor (17; 23) and the conductance sensor (20) to provide anoutput that indicates if there is a blood bag tube inserted between electrodes, or if itis a foreign object; wherein the processor comprises a memory storing threshold values for distance,and conductance in memory, whereby the output from the processor is acomparison of sensor outputs with the stored threshold values; and wherein the processor comprises a memory storing clamping force profiles forvarious material types, whereby the output from the processor is a comparison of detector output with the stored profiles.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1651178A|SE540302C2|2016-09-02|2016-09-02|A welding apparatus having a safety feature|SE1651178A| SE540302C2|2016-09-02|2016-09-02|A welding apparatus having a safety feature|
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    CN201780056205.3A| CN109689344B|2016-09-02|2017-08-15|Welding device with safety feature|
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