CN1204266A - Heated respiratory conduit - Google Patents
Heated respiratory conduit Download PDFInfo
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- CN1204266A CN1204266A CN 96198909 CN96198909A CN1204266A CN 1204266 A CN1204266 A CN 1204266A CN 96198909 CN96198909 CN 96198909 CN 96198909 A CN96198909 A CN 96198909A CN 1204266 A CN1204266 A CN 1204266A
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Abstract
This invention is a heated corrugated (21) conduit (7) for use in a respiratory humidification system (5). A heater wire (20) within the conduit reduces the occurrence of condensation or 'rain out'. The heater wire is spirally wound in a helix or double helix with both ends of the wire available for termination at one end of the conduit.
Description
Technical field
The present invention relates to the respiratory humidification device, more special but the method that not only relates to heated type respiratory humidification pipe and be used to make such humidification pipe, wherein, humidification is effective in the breathing circuit of respiratory humidification system, is used for providing such gas to the patient who needs humidified gases or other people.
Background technology
For to needs gas, for example provided such gas, from the source of the gas to patient (suction nozzle) and return source of the gas (exhaust tube) from patient and all used flexible pipe by the patient of the gas of humidification or other people.When the gas that is supplied during by humidification, the amount that needs to occur in the condensation (promptly " liquefaction) of inside pipe wall is reduced to minimum, because this condensation is gathered soon, need regularly drain.Some existing respiratory humidification pipes are equipped with heater strip and heat tube wall, and purpose is to reduce condensation, also help control be sent to the patient place by the temperature of humidified gases.
The example that the respiratory humidification pipe of heater strip is housed is disclosed in our previous the United Kingdom's patent application, and this application was announced with GB2284356A June 7 nineteen ninety-five.Revealed heater strip is an annular heating member, and two free ends of ring are drawn to be connected on the humidifier on the alternating-current voltage source from an end of pipe.Heater strip has following shortcoming along the heating tube that pipe lies in this form on the careless paths end, the gas of the pipe of promptly flowing through along the pipe width not by even heating.In addition, the stochastic behaviour that heater strip is arranged makes the regional area of tube wall can be in such temperature, and this temperature is low to being enough to make when other zone during by superheated, and these zones but condensation can take place.
Some humidification pipes have one around the outer heater strip of pipe, and purpose is equably heat to be fed on the tube wall (around pipe on every side and along the length direction of wall) to overcome condensation problem.The outer US4 that can propose in BOC group company around the example of heated type humidification pipe, the DE4244493 German patent application that 686, No. 354 United States Patent (USP)s and Heinz Eilentropp propose is seen in announcing.Yet the electric energy that these two kinds of structures all require heated object to absorb enough passes in the gas heat can be passed tube wall greatly then.Correspondingly, as the temperature of heater strip, the electric energy that is heated the silk absorption also is excessive.In addition, owing to must at first pass through tube wall from the heat of heater strip, heated air institute's time spent is also too much, and the temperature of outer tube surface may be high enough to scalding patient or care-giver.
General introduction of the present invention
Therefore, an object of the present invention is to provide a kind of heated type gas delivery channels, this passage overcomes top shortcoming at least to a certain extent or provides a useful selection for industry to the major general.
Correspondingly, in first aspect, the present invention includes a kind of heated type gas delivery channels, this passage is used for being suitable in the aerating system of described gas delivery channels supply air flow, and it comprises:
The pipe that predetermined length is arranged with an inner surface and a longitudinal axis,
The heater that is suitable for heating described air-flow and/or described pipe that predetermined length is arranged, wherein, described heater is placed in described tube device and the described air-flow, wherein, described heater be the elasticity bendable and be made into a predetermined shape, this shape limits a volume, and this volume is the part of described pipe volume.
On the other hand, the present invention includes a kind of heated type gas delivery channels that is used in the aerating system that produces an air-flow, this passage comprises:
A pipe that is suitable for guiding described air-flow,
A heater that when energising, is suitable for the described air-flow heat supply in described pipe, wherein, described heater is arranged in the described air-flow in the described pipe, like this so that described air-flow be forced to repeatedly by described heater along the total length of described heater substantially.
On the other hand, the present invention includes a kind of logical method of heated type gas delivery that is used in aerating system that is used for making, the method includes the steps of:
ⅰ) make a pipe by its bootable gas,
ⅱ) with one section spirillum that has less than the diameter of described ips of insulated resistance wire coiled with predetermined length, and
ⅲ) the helically wound resistance wire that will form like this inserts described pipe.
Key element of the present invention is a said structure, and the present invention has also imagined only as an example the structure of giving below.
Brief Description Of Drawings
Fig. 1 is one section a front view of a heated type respiratory humidification pipe of making according to the present invention, and this figure has showed the details that heater strip is covered.
Fig. 2 is the end view that is showed in the pipe of Fig. 1.
Fig. 3 is the cutaway view that the pipe among Fig. 1 is cut open along the A-A direction.
Fig. 4 is the axonometric chart that is showed in the pipe of Fig. 1, and this figure has showed the details that heater strip is covered.
Fig. 5 is a temperature and graph of relation along the distance of the pipe width of traditional prior art.
Fig. 6 is a temperature and graph of relation along the distance of the pipe width that is shown in Fig. 1.
Fig. 7 is one section the enlarged drawing that is shown in the pipe of Fig. 3.
Fig. 8 is the amplification view that the pipe of an interior sheath is arranged between tube wall and helically wound heater strip among Fig. 3.
Fig. 9 is the cutaway view around the amplification of the pipe of pipe epitheca on every side that has among Fig. 8.
Figure 10 is the cutaway view around the amplification of the pipe of pipe epitheca on every side that has among Fig. 3, and
Figure 11 is the exploded view that comprises the respiratory humidification system of the pipe that is shown in Fig. 1.
Figure 12 is the cutaway view of the part of the heated respiratory conduit of second preferred embodiment making according to the present invention, and this figure has showed the heater strip of coiled double helix.
Figure 13 is the front view of the heater strip with an additional nonessential straight loop section among Figure 12.
Figure 14 is a kind of part exploded view of alternate preferred respiratory humidification system, and this system is particularly suited for as a cannula type CPAP device, this device when and Figure 13 in heater strip time spent together, can easily be repacked into the humidification system among Figure 11.
Figure 15 is the front view that substitutes the heater strip structure of the coiling that is shown in Figure 12, and
Figure 16 is a temperature and graph of relation along the distance of tube length direction, and this figure has showed the comparison of traditional heater strip and the heater strip among Figure 15.
Implement best mode of the present invention
Referring to Figure 11, displaying be a respiratory humidification system, wherein, to humidifying chamber 3 air feed (for example oxygen or anesthesia gas), humidifying chamber is heated by the hot plate 4 of respiratory humidification device 5 by gas outlet 2 for blower 1.The water that humidifying chamber is 3 li is heated, and produces water vapour to the gas humidification in the humidifying chamber, and the gas in the humidifying chamber comes out by exporting 6 then, enters a heated type gas delivery channels or air-breathing air tube 7.Traditional " Y shape part " 8 receives from the gas of pipe 7 and gas can be located to patient by exporting 9.Patient expired gas is transferred back to an other heated air transfer passage or exhaust tube 10 by " Y shape part " 8 then, gets back to blower 1 then.
Be reduced to bottom line in order to manage 7 condensations of managing generation in 10 in addition, can in each root pipe, adorn heater strip.Heater strip is preferably around insulating core insulated " nickel chromium triangle " (nickel/evanohm) resistance wire on every side.The resistance ratio of the heater strip of per unit length is of the prior art much smaller, yet because the length of the silk that the present invention uses in pipe is longer, its all-in resistance is equally matched with heater strip of the prior art.Electric energy is fed to heater strip by the joint 16 and 17 that inserts socket from humidifier 5, and wherein, socket is the cover that is arranged in every pipe one end.Insulation sheath around the heater strip is thermoplastic preferably, and this material enters a kind of like this state when being heated to predetermined temperature, and its shape can change, and when cooling, new shape can flexiblely keep getting off securely.
Referring to Fig. 1 to 4, one section of the preferred form of pipe 7 (or 10) is at length displayed.Pipe is for example by elastomeric material, as polyethylene/EVA mixture or silicone rubber, moulds and forms.Pipe preferably has one " rib is arranged " or " ripply " structure with can crooked (label of rib is 21), this can finish by following method, the colloid material that i.e. blowing is melted is to form a ring-shaped cylinder, this cylinder is to external pressure and be attached on the inner surface of revolving die, and revolving die is pressed in rib on the pipe.In the inside, pipe 7 (or 10), a helically wound heater strip 20 is arranged.Heater strip 20 is preferably as seeing among Fig. 2, length direction along pipe pastes or leans against on its inwall, or uses another kind of method, heater strip can have a diameter less than ips, in this case, helically wound heater strip will drop on the pipe the inside.
For heater strip 20 is made the spiral type of preferentially selecting for use, before inserting in the pipe, at first it is become spirillum around (preferably being critical) around mould.Heater strip 20 then, when its also on its mould the time, be heated to predetermined temperature, this will make the insulation sheath of silk softening, like this, after cooling, heater strip will keep its new, spiral shape.Above-mentioned heating can be finished in the following method, the coiling silk and the mould that are heated to proper temperature are placed one section preset time in apparatus for baking, or use another kind of method, the end of helically wound silk is connected on power supply and the applied voltage, like this, just produce an electric current greater than rated current, this electric current flows through one section preset time on silk.Select voltage and time so that insulation sheath obtains required softening (but must not melt).Mould can be that its external diameter is than little pipe or the cylinder of pipe 7 internal diameters.
The spirochetal pitch of heater strip can be regulated in the stage of bending, like this, and the needs of residing varying environment condition when whole heating tube just can be made to such an extent that adapt to specific humidification system work.That is, if ambient temperature may be very low, so, spirochetal pitch can around littler (adjacent turn draws closer together), like this, when when energising, the mid point on the tube wall between two adjacent turns just can not drop to a temperature that condensation may take place.Conversely, if temperature may be quite high, so, just can increase pitch, like this, the total length of the silk in the pipe just can reduce, thereby reduces production costs.Be appreciated that, helically wound heater strip limits a gassiness cylindrical volume effectively, make in that the big of heating is provided to air-flow effectively surface area, improve heat passage in, can allow and freely be flow through pipe by humidified gases and can not produce basically and hinder air-flow.
Should be noted that between the resistance (more silk can increase flow resistance) that the heat (more silk can increase heat supply) and the heater strip of the amount that occurs in the condensation in the pipe (more silk can reduce condensation), heater strip supply produces air-flow, have one to trade off.By test, we have found to work as pitch between about 1 circle of the pipe of every 50mm and about 20 circles, spiral shell footpath is between about 8mm and about 20mm the time, and the heater strip of manufacturing has good heat characteristic, and has good trading off between the conflicting requirement of mentioning in front.
In case the heater strip spirillum is made into shape, just can and be attached to top heater strip and insert pipe, or use another kind of method mould, at first spirillum is taken off from mould.In case arrived the pipe the inside, just mould to be taken away, the inherent elasticity of heater strip will make spiral shell directly enlarge, thereby the heater strip spirillum is pressed on the tube inner wall.Use another kind of method, as already mentioned, the heater strip spirillum can have the diameter littler than ips, and in this case, the heater strip spirillum will lie in one side of tube wall.Then, one end of heater strip is terminated in socket 18 or 19, and wherein, socket is arranged in the cover of pipe one end, and the other end of heater strip is connected on the current loop at the other end of pipe, this loop can have a low-resistance along tube exterior " " line.When comprising a low-resistance silk as the loop, the voltage at junction point place is zero shape substantially, and this is favourable in some medical environments, and in these environment, sensitive monitoring device is placed near the junction point (near patient head).Use another method, in an embodiment who more preferentially selects for use who is showed in Figure 12, heater strip can be wound into double helix, and like this, the two ends of heater strip all are positioned at an end (perhaps double helix can be made by the heater strip that at one end is connected on the low-resistance backflow silk) of pipe.The free end of silk of refluxing also is terminated in the socket 18 or 19 in the pipe cover. Electric connection 16 and 17 is inserted into socket 18 and 19, so that the electric current of the heater strip of pipe the inside is under the control of controller 11, like this, according to temperature reading, heater strip can controllably be switched on occurs in condensation in the pipe with minimizing.
In the situation of the heater strip (as shown in figure 12) of coiled Double helix shape, if heater strip only is fixed at an end (end of heater strip is terminated in that pipe end in socket 18 or 19) of pipe, so, heater strip will be close around state to it because of elastic recovery, only stretches out a part along pipe.For avoiding this problem, on the double helix apart from silk should be fixed on a position by termination ends that end farthest, this position be located on or near on the pipe apart from socket 18 and 19 that end farthest.This can finish with several known methods, for example a circumferential band (not shown) is connected on the heater strip at " two end " the end place near heater strip, then hoop is fixed to the inside of pipe.Circumferential band preferably is embedded in the inside (hoop of cylindrical ditch the inside can liken the inner tube of a tyre that is contained in the tire the inside to) in the middle of the interior cylindrical ditch 26 of pipe well.The location of the hoop inside tube end also can be used to control the pitch of helically wound heater strip to overcome the condensation between the adjacent turn that may occur in silk.
Find that the helically wound humidification pipe of heated type constructed according to the invention has following benefit, promptly improved from heater strip air-flow energy delivered in pipe.This is because air-flow flows through this fact of major part on silk surface along the total length (this length is more much bigger than tube length) of silk, also since heater strip and air-flow along pipe width this fact that interacts.Correspondingly, the air-flow around the whole periphery of pipe can be heated the silk heating.This fact is illustrated in Fig. 6, only illustrate a single-screw body among the figure, and, can see in the drawings, because the layout of heater strip, than being more evenly distributed of seeing in the prior art systems, in prior art systems, heater strip longitudinally lies in pipe the inside (see figure 5) along the Temperature Distribution of pipe width.Double helix make two ends can be terminated in same set of in and in the silk time of need not to reflux, provide than single-screw body better heating performance.Can see that from Fig. 5 the temperature in the pipe of prior art is the highest near the place of silk, but descend greatly that so, the gas that this position just may take place in condensation and the pipe can be by even heating in the temperature of the tube wall on heater strip opposite.
Correspondingly, owing to improve to the efficient of gas transfer energy, compared with prior art, the temperature of heater strip can be lowered, and has reduced the danger that pipe melts.Heater strip need pass pipe with heated air with energy around the heating tube of the prior art of pipe outside.The present invention has improved energy efficiency (because by horizontal and vertical by even heating along pipe of humidified gases), thereby the required gross energy of humidification system makes and is heated the electric energy reduction (even the all-in resistance of heater strip equates substantially with of the prior art usually) that silk absorbs.
Referring to Fig. 7, can see that the air-flow 23 in ribbed pipe or the corrugated tube produces little eddy current 22 in the recess of inner tubal wall.This phenomenon has increased from gas to the tube wall then the thermal energy transfer out to surrounding nocuously, because be heated heat circulation that gas will pass through continuously at each eddy current nidus to tube wall in the eddy current.Making great efforts to reduce in the process of this problem and further raising energy efficiency, can an interior sheath 24 of for example being made by thin plastic material inserted in the pipe at spirillum of making by heater strip 20 and the space between the inner tubal wall.This step can carry out before inserting silk in the pipe, or used another kind of method, and interior sheath can be with the pipe extrusion molding.Then, the end of sheath is bonded or be sealed on the pipe.Be supplied in from the gas of humidifying chamber and be forced to and from interior sheath 24, flow through heater strip, at interior sheath 24 with manage between 7 the air entrapment insulating barrier 26 that forms and further reduced the heat passage of environment towards periphery, and reduce of the influence of the variations in temperature of ambient temperature, and when keeping the ribbed pipe supply, eliminated eddy current to gas temperature.For further improving the energy efficiency of heating tube, whole pipe/heater strip/interior sheath structure can be inserted in the epitheca 25 as shown in Figure 9, simultaneously, the end of epitheca is bonding or be sealed to pipe end.So other air entrapment layer 27 is added to heating tube " sandwich " and goes up to reduce the energy delivery of environment towards periphery.If the diameter of epitheca is to be a tight fit in around the pipe, so, between pipe and epitheca, will form a series of insulating columnar air entrapment covers, but not a successive cylinder, further with pipe isolated coming from the variation of environmental condition.Use another kind of method, as shown in figure 10, can use epitheca and needn't also will add interior sheath.
Referring to Figure 13, other nonessential characteristics of heater strip constructed in accordance have been showed.In this embodiment, bend around heater strip to obtain two different parts, the part 31 of a coiled Double helix shape and an individual pen part 30.Evenly arrange along pipe for guaranteeing heater strip, can bind round the fixedly end 32 (as has been describ) of heater strip of (not shown) with one at pipe end or near it, perhaps can bind round fixedly heater strip with one in the position between helically wound part 31 and the individual pen part 30.The benefit that adds individual pen part 30 can be explained with reference to the respiratory humidification device that is showed in Figure 14.
Figure 14 shows humidification system and can how to take on to obtain " cannula type CPAP " (successive positive gas circuit pressure).This structure be showed in the identical of Figure 11, except the exhaust tube among Figure 11 10 is replaced by short pipe 32, this pipe has one and is connected in its free-ended CPAP valve 33 to locate to produce constant compression force patient.Exhaust tube 10 among Figure 11 can be made up of two pipes that connect together 32 and another pipe (not shown).Then, the heater strip of Figure 13 can insert the expiration branch road of breathing circuit (part 30 places pipe 32, and part 31 places the second short tube (not shown)).Then, for producing the structure of Figure 14, only need second short tube and heater strip 20 are taken off and add CPAP valve 33.When the system that reconfigures Figure 14 when producing the system of Figure 11 again, the benefit of straight part 32 is clearly.In this reconfigures,, manage in 32 so can easily it be put back to, yet spiral helicine pipe just can not easily be inserted by user because the individual pen part 30 of heater wire will be stretched out from second short tube.
The heater strip structure embodiment of a further alternate coiling of preferentially selecting for use is showed in Figure 15.The heater strip of the coiling of Figure 15 by with embodiment that the front is preferentially selected for use in identical insulated resistance wire make, and can under the situation that adds or do not add inside/outside sheath (estimating that the inside/outside sheath is with optional to this embodiment), use.Can see that by double helix of curved coiled, its pitch changes along silk heater strip.Best, pitch is at one end minimum and increase towards the other end.But, with the different varying pitch structure of being showed may be preferably fixed according to environment for use.
A benefit that is shown in the pitch structure of Figure 15 is the coiling silk can be inserted pipe, like this, close around end (pitch minimum) can be placed in air tube 7 apart from that nearest end of humidifier 5.Owing to left outlet 6 by humidified gases with the highest relative humidity, condensation more likely takes place usually, therefore, should provide the higher heat that adds in this position.Thereby, heater strip 20 close around end just in pipe required place provide one increased add temperature.The varying pitch heater strip of coiled Double helix shape that has been found that Figure 15 reduces condensation, especially in the humidifier exit when whole pipe keeps gas temperature.
Similarly the coiling heater strip can be used in the exhaust tube 10, yet, close around end should be placed in pipe apart from that nearest end of patient head because will be had the place of high relative humidity by breath here, thereby be the place that condensation most possibly takes place here.The benefit of this heater strip structure is illustrated among Figure 16, the temperature that can see heating tube (line 35) lining of prior art in the drawings is increased near the end maximum gradually along pipe, by comparison, the heater strip that (line 34) structure according to the present invention has been arranged is connected near the end of the pipe on the humidifier gas temperature near maximum.
When being installed in silk in the pipe, the pitch of heater strip is preferably in about 1 circle (coarse pitch) of pipe of every 50mm in the scope between about 20 circles (fine pitch).
Varying pitch heater strip for the coiled Double helix shape of making Figure 15 carries out similar process as described in the embodiment of reference front.Resistance wire at first winds to make a ground floor towards a direction on mould preferably tightly around to a rotating mould, then in the opposite direction in this wraparound original position above one deck.Yet in this embodiment, in order to make varying pitch, mould is tapered rod (or frustoconical rod).In order to make the heater strip that is shown in Figure 15, tapered rod preferably has the end diameter and the outside diameter that is about 18mm that are about 3mm.Curved around and heating (as previously described) after, silk is taken off and makes it can flexiblely present a new shape with about 4mm to about 20mm diameter from its mould.When longitudinal stretching, the shape of the character of dependence thermoplasticity crust and used mould, it is constant substantially along its length that the coiling heater strip can meet diameter, and have required varying pitch.Use another kind of method, the silk of making shape that is stretched can meet varying pitch and/or become the heater strip of diameter.Fine pitch/the small diameter area of the heater strip that is stretched is formed at the narrow end of conical die rod, and coarse pitch/large-diameter region is formed at the big end of mould rod.Its reason can be understood better by the analogy spring, i.e. the extension of close winding spring (fine pitch) is unlike easy around the spring that must dredge (coarse pitch).Then, the end of varying pitch coiling heater strip can be and connects and terminate in the socket 18 or 19 in the pipe end cover, and " two end " end over there of helically wound silk is available, and for example, the circumferential band that resembles described above is in place at the pipe internal fixation.
So, in the form of preferentially selecting for use, the invention provides a kind of heated type humidification pipe at least, wherein, gas and pipe are heated more equably, have reduced the danger that condensation takes place.The present invention makes that also the heat distribution of the interior gas of pipe can be more even, and this is owing to the following fact, and one section heater strip more much bigger than tube length is arranged in the pipe on the position of and pipe range wide along pipe, and this has the most advantageously reduced condensation.This structure has also improved total energy efficiency of respiratory humidification system, and has reduced the influence of changes in environmental conditions to gas temperature.
Claims (53)
1, a kind of heated air transfer passage, this passage is used in the aerating system that is suitable for supply air flow in described gas delivery channels:
The pipe that predetermined length is arranged with an inner surface and a longitudinal axis,
The heater that is suitable for heating described air-flow and/or described pipe that predetermined length is arranged, wherein, described heater is placed in described tube device and the described air-flow, wherein, described heater be the elasticity bendable and make a predetermined shape, this shape limits a volume, and this volume is the part of described pipe volume.
2, heated air transfer passage as claimed in claim 1, wherein, the cross section of the volume that described heater limited is circular substantially, the volume that is limited has an aligned substantially longitudinal axis of the axis with described pipe, so that keep in the time of described air-flow high heat passage, the obstruction of described gas flow is reduced to minimum.
3, as claim 1 or the described heated type gas delivery channels of claim 2, wherein, described heater comprise a single hop, be suitable for being connected on the supply unit by the resistance wire of electric insulation, wherein, described resistance wire is wound into a spirillum that limits described volume.
4, heated type transfer passage as claimed in claim 3, wherein, described resistance wire is wound into a double helix so that the two ends of described resistance wire can be all at an end of described pipe to be connected on the described supply unit.
5, as claim 1 or the described heated type gas delivery channels of claim 2, wherein, described heater has an electric insulation crust, this crust helps described heater to keep shape, wherein, when curving a new shape and being heated to a predetermined temperature when above, described heater will flexibly keep described new shape when cooling.
6, as claim 3 or the described heated type gas delivery channels of claim 4, wherein, determine the pitch and/or the diameter of described helically wound silk for adjustable ground, the part of described heater is installed on the described pipe adjustablely, and pitch and/or diameter need be regulated so that the condensation that takes place between the adjacent turn of described helically wound silk is minimized.
7, as claim 3 or the described heated type gas delivery channels of claim 4, wherein, described spirochetal pitch and/or diameter become along described heater.
8, heated type gas delivery channels as claimed in claim 7, wherein, described aerating system comprises an inlet manifold assembly, this device is suitable for to the patient end of described inlet manifold assembly described gas being fed to patient from the green end that adds of described inlet manifold assembly, wherein, to add green end less described for described spirochetal pitch.
9, heated type gas delivery channels as claimed in claim 7, wherein, described aerating system comprises an exhaust tube device, this device is suitable for from the patient who is positioned at described exhaust tube device patient end described gas being directed to the exhaust end of described exhaust tube device, wherein, described spirochetal pitch is less at described patient end.
10, heated air transfer passage as claimed in claim 7, wherein, described spirochetal pitch is enclosed between about 20 circles at every 50mm pipe about 1 and is changed.
11, as claim 3 or the described heated air transfer passage of claim 4, wherein, an interior sheath is inserted in the described pipe also coaxial with it, the end of sheath is sealed on the described pipe in described so that described in insulating barrier that is closed gas of formation between sheath and the described pipe.
12, as claim 3 or the described heated type gas delivery channels of claim 4, wherein, described pipe is inserted in the epitheca, and the end of described epitheca is sealed on the described pipe, so that form an insulating space that is closed gas between described epitheca and described pipe.
13, heated air transfer passage as claimed in claim 4, wherein, described resistance wire has two parts, the first of a coiled Double helix shape and the second portion of an individual pen, the part of described coiled Double helix shape comprises two ends of described resistance wire, and two ends of the described silk of described individual pen part distance farthest.
14, as claim 3 or the described heated air transfer passage of claim 4, wherein, the pitch of described helically wound resistance wire is enclosed between about 20 circles at every 50mm pipe about 1.
15, as claim 3 or the described heated type gas delivery channels of claim 4, wherein, the diameter of described helically wound resistive conductor is between about 8mm and about 20mm.
16, a kind of heated type gas delivery channels that is used in the aerating system that produces air-flow comprises:
A pipe that is suitable for guiding described air-flow,
A heater that is suitable for the described air-flow heat supply in described pipe when energising, wherein, described feeder apparatus is arranged in the described air-flow in the described pipe, like this, described air-flow just is forced to basic total length along described heater, repeatedly by described heater.
17, heated type gas delivery as claimed in claim 16 is logical, and wherein said heater comprises the insulated resistance wire of a single hop, and wherein, described silk is wound into a spirillum, and described spirochetal diameter is littler than the internal diameter of described pipe.
18, heated type gas delivery channels as claimed in claim 16, wherein, described heater comprises the insulated resistance wire of a single hop, and wherein, described silk is wound into a double helix, and the two ends of silk are all at an end of described pipe.
19, as claim 16 or the described heated air transfer passage of claim 17, wherein, described insulated resistance wire extends between two ends of described pipe substantially, has one simultaneously by be connected to the described current loop that low-resistance backflow silk provides that also extends substantially that is insulated resistance wire one end between described pipe two ends.
20, as claim 17 or the described heated air transfer passage of claim 18, wherein, the described resistance wire that is insulated is insulated with a thermoplastic material layer, so that described silk can be wound into described spirillum, be heated and be cooled then so that described silk can flexibly keep described spiral-shaped.
21, as claim 16 or the described heated air transfer passage of claim 17, wherein, described pipe comprises a corrugated tube, the coaxial interior sheath of one and described pipe is installed between the inner surface of heater and described pipe, the ripple of described pipe and described in form a series of insulating spaces between the sheath.
22, as claim 16 or the described heated air transfer passage of claim 17, wherein, described pipe comprises a corrugated tube, and an epitheca is installed in the outside and coaxial with it to form around described pipe external insulation space on every side of described pipe.
23, heated air transfer passage as claimed in claim 22, wherein, described sheath and described pipe are tight fit basically, so that described external insulation space comprises a series of described ripple of described pipe and insulating spaces between the described epitheca of being in.
24, as claim 17 or the described transfer passage of claim 18, wherein, be installed on the described pipe by a part of adjustable ground described heater strip, described helically wound pitch and/or the diameter that is insulated resistive conductor is adjustable, like this, the adjusting of described pitch and/or diameter can be undertaken by regulating the installation site, so that condensation can be eliminated by the space between the adjacent turn of basic described silk from inner tubal wall.
25, as claim 17 and the described heated air transfer passage of claim 18, wherein, the described helically wound pitch that is insulated resistive conductor is enclosed between about 20 circles at every 50mm pipe about 1.
26, as claim 17 or the described heating transfer passage of claim 18, wherein, the described helically wound diameter of resistance wire that is insulated is between 8mm and about 20mm.
27, as claim 17 or the described heated type gas delivery channels of claim 18, wherein, described spirochetal pitch becomes along described heater.
28, heated type gas delivery channels as claimed in claim 27, wherein, described aerating system comprises an inlet manifold assembly, this device is suitable for to the patient end of described inlet manifold assembly described gas being fed to patient from the green end that adds of described inlet manifold assembly, wherein, to add green end less described for described spirochetal pitch.
29, heated air transfer passage as claimed in claim 27, wherein, described aerating system comprises an exhaust tube device, this device is suitable for described gas is directed to from the patient at described exhaust tube device patient end the exhaust end of described exhaust tube device, wherein, described spirochetal pitch is less at described patient end.
30, heated type gas delivery channels as claimed in claim 27, wherein, described spirochetal pitch is enclosed between about 20 circles at the pipe of every 50mm about 1 and is changed.
31, a kind ofly be used for making a kind of method that is used in the heated type gas delivery channels of aerating system, comprise following steps:
ⅰ) make a pipe by its bootable gas,
ⅱ) with one section predetermined length be insulated spirillum that has less than the diameter of described ips of resistance wire coiled, and
ⅲ) the helically wound resistance wire that will make like this inserts described pipe.
32, the method that is used to make the heated type gas delivery channels as claimed in claim 31, wherein, described heater strip is wound into a double helix, and the two ends of described silk are all at an end of described pipe.
33, as claim 31 or the described method that is used to make the heated air transfer passage of claim 32, wherein, the described resistance wire that is insulated is by the crust insulation with a thermoplastic, and described method comprises following steps, helically wound resistance wire is heated to makes the remollescent predetermined temperature of described insulator, the resistance that is cooled cools off described resistance wire then, so that will flexibly keep its helically wound shape.
34, the method that is used to make the heated type gas delivery channels as claimed in claim 33, wherein, described heating steps is performed such, the end of helically wound heater strip is connected on the voltage source, produce an electric current and on described resistance wire, flow through one section preset time with enough current intensity, with the temperature that improves described insulation sheath to described predetermined temperature.
35, the method that is used to make the heated air transfer passage as claimed in claim 33, wherein, described heating steps is such carrying out, and helically wound heater strip is inserted in the heater, has reached described predetermined temperature and has kept one section preset time up to described insulation sheath.
36, as claim 31 or the described method that is used to make the heated type gas delivery channels of claim 32, wherein, the described step of making described pipe is included in the step that the surfaces externally and internally of described pipe is substantially equally spaced made ripple.
37, as claim 31 or the described method that is used to make the heated air transfer passage of claim 32, wherein, curved described step around described resistance wire comprises diameter this step between about 8mm and about 20mm that guarantees described helically wound resistance wire.
38, as claim 31 or the described method that is used to make the heated type gas delivery channels of claim 32, wherein, curved described step around described resistive conductor comprise guarantees described resistance wire pitch between about 1 circle of the pipe of every 50mm and about 20 encloses.
39, as claim 31 or the described method that is used to make the heated type gas delivery channels of claim 32, wherein, curved described step around described resistance wire comprise make resistance wire around an external diameter than little basic of described ips for twining this step around the columniform mould.
40, as claim 31 or the described method that is used to make the heated type gas delivery channels of claim 32, wherein, described method also comprises following steps, promptly before described helically wound resistance wire is inserted the described step of described pipe, an interior sheath is inserted described pipe and coaxial with it, end with described sheath is sealed on the described pipe then, so that form an insulating barrier that is closed gas between sheath and the described pipe in described.
41, as claim 31 or the described method that is used to make the heated type gas delivery channels of claim 32, wherein, described method also comprises following steps, after described helically wound resistance wire is inserted the described step of described pipe, described pipe is inserted an epitheca, end with described epitheca is sealed on the described pipe then, so that form an insulating space that is closed gas between described epitheca and described pipe.
42, the method that is used to make the heated air transfer passage as claimed in claim 31, wherein, described bending around step comprises a step that a low-resistance backflow silk is connected to an end of described helically wound silk, and the remaining two ends of the coalition that heater strip and low-resistance line are formed are at the same end of described pipe.
43, the method that is used to make the heated air transfer passage as claimed in claim 31, wherein, described bending around step carried out on the columniform mould substantially at one as follows, promptly along described mould towards first direction on described mould the ground floor of coiling silk, then, along described mould reverses direction making second layer on described ground floor, so that when being stretched, the silk that bends will have constant pitch, at this simultaneously, rotate described mould.
44, the method that is used to make the heated type gas delivery channels as claimed in claim 31, wherein, curved is to carry out on a basic mould for frustoconical or taper as follows around step, promptly along described mould towards first direction on described mould the ground floor of coiling silk, then along described mould reverses direction and on described ground floor the making second layer, so that when being stretched, the silk that bends will have the pitch and/or the reducing joint of variation.
45, the method that is used to make the heated type gas delivery channels as claimed in claim 44, wherein, the described pitch that bends silk changes between about 1 circle of the pipe of every 50mm and about 20 circles.
46, the method that is used to make the heated type gas delivery channels as claimed in claim 44, wherein, described aerating system comprises an inlet manifold assembly, this device is suitable for to the patient end of described inlet manifold assembly described gas being fed to patient from the green end that adds of described inlet manifold assembly, wherein, helically wound resistance wire is inserted described step in the described pipe and comprise that the pitch and/or the diameter that make described helically wound silk be arranged to minimum step at the described green end that adds of described inlet manifold assembly.
47, the method that is used to make the heated type gas delivery channels as claimed in claim 44, wherein, described aerating system comprises an exhaust tube device, this device is suitable for bringing in the described gas of guiding from the patient at described exhaust tube device patient end to the aerofluxus of described exhaust tube device, wherein, the described step of helically wound resistance wire being inserted described pipe comprises the pitch and/or the diameter that make described helically wound silk and is arranged to hold minimum step the described patient of described exhaust tube device.
48, a kind ofly be used to make basically as describe with reference to accompanying drawing herein and by the method for heated type gas delivery channels shown in the drawings.
49, a kind of be used to make describe with reference to accompanying drawing herein basically and by the method for heated air transfer passage shown in the drawings.
50, a kind of basically as herein with reference to description as described in the accompanying drawing and by humidification system shown in the drawings.
51, a kind of basically as herein with reference to Fig. 1 of accompanying drawing, 2,3,4,6,7,8,9 and 10 describe and by the heater strip shown in it.
52, a kind of basically as describing with reference to Figure 13 of accompanying drawing herein and by the heater strip shown in it.
53, a kind of basically as describing with reference to Figure 15 of accompanying drawing herein and by the heater strip shown in it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96198909 CN1204266A (en) | 1995-11-13 | 1996-11-13 | Heated respiratory conduit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ280446 | 1995-11-13 | ||
| NZ286497 | 1996-05-02 | ||
| CN 96198909 CN1204266A (en) | 1995-11-13 | 1996-11-13 | Heated respiratory conduit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1204266A true CN1204266A (en) | 1999-01-06 |
Family
ID=5129210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96198909 Pending CN1204266A (en) | 1995-11-13 | 1996-11-13 | Heated respiratory conduit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1204266A (en) |
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| CN102125716A (en) * | 2010-01-19 | 2011-07-20 | 崇仁(厦门)医疗器械有限公司 | Transfer pipe with heat discoloration sheet |
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1996
- 1996-11-13 CN CN 96198909 patent/CN1204266A/en active Pending
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