CN207477776U

CN207477776U - The variable tracheal catheter of diameter

Info

Publication number: CN207477776U
Application number: CN201720433292.7U
Authority: CN
Inventors: 肖志勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-04-24
Filing date: 2017-04-24
Publication date: 2018-06-12
Anticipated expiration: 2027-04-24

Abstract

The variable tracheal catheter of diameter, is related to medical equipment technical field, including catheter body, support bar and the lockable mechanism for being connected to catheter body；Catheter body includes at least the stretch section that is located at its leading portion and can stretch along its length, its internal diameter and outer diameter become smaller after stretch section stretches along its length；Support bar is used to support stretch section and is at tensional state；Lockable mechanism is used to carry out limitation locking to support bar so that support bar keeps the support to stretch section；After lockable mechanism is released to the limitation locking of support bar, support bar cancels the support force of stretch section, and stretch section bounces back under own resilience effect, and in retraction process, the internal diameter and outer diameter of stretch section become larger.Glottis caused by the variable tracheal catheter of the diameter can mitigate intubation and tracheal mucosa damage reduce intubation difficulty and postoperative sore-throat incidence, have larger clinic popularization and application values.

Description

The variable tracheal catheter of diameter

Technical field

The utility model is related to medical equipment technical field, the variable tracheal catheter of more particularly to a kind of diameter.

Background technology

GENERAL ANESTHETICS has obvious inhibiting effect to breathing, using muscle relaxant person and face, neck, five official rank general anesthesia major operation persons, It all needs to carry out trachea cannula.Tracheal catheter played an important role in the rescue of urgent patient, such as respiratory failure, cardiopulmonary When recovery, drug poisoning and newborn's severe asphyxia, it is necessary to endotracheal intubation is used, it is shown in FIG. 1 through orotracheal tube Intubation is clinically common intubation procedure.

Postoperative sore-throat（POST）It is common complication after general anesthesia intubation, incidence reaches 20-50%, postoperative throat The generation of pain and patient age, gender, the thickness of tracheal catheter, trachea cannula operation and cuff for endotracheal catheter（Generally gas Capsule）Pressure correlation.The tracheal catheter outer diameter of adult male is generally used in more than 11mm, internal diameter is in more than 7.5mm, in equal item Under part, catheter outer diameter more it is thick theoretically be easy to cause glottis and tracheal mucosa damage, reduce tracheal catheter can reduce intubation Difficulty, simultaneously for mitigating, postoperative sore-throat is also extremely advantageous, cannot be in order to mitigate postoperative sore-throat certainly in clinical manipulation And small gauge catheter is selected simply it may first have to ensure the ventilatory effect of conduit, in the case, by catheter design into diameter Variable structure just seems necessary.

Chinese patent literature CN2792524Y discloses a kind of tracheal catheter of reducing, which is included from middle part To " C " type stretch section of front end inclined plane shape port, corrugated extension airbag, wave are equipped on the longitudinal slot of " C " type stretch section In overlapping shape during line shape extension airbag unaerated, while " C " the type stretch section of flexible wall is in nature retracted state, works as insertion It is inflated afterwards toward corrugated extension airbag, extension airbag trails, and under bag expansion force effect, longitudinal slot is stretched, so as to So that " C " type stretch section entirety caliber becomes larger.There are following defects for the tracheal catheter of above-mentioned reducing：It is logical inside extension airbag Setting lacing wire film is crossed to prevent air bag inner wall bulging from blocking air flue, although mentioning lacing wire film in the literature for preventing air bag past Interior expansion leads to airway narrows, but actual conditions are, only may not prevent air bag well by lacing wire film toward inside and outside two Side bulging, because air bag is made of flexible medical grade rubber, it can be expanded toward surrounding during inflation, although airbag wall and lacing wire Film contact site is held, but is contacted between lacing wire film and airbag wall similar to line, at the position do not held by lacing wire film（Such as The position of 8 both sides of lacing wire film in document Fig. 4）It still inevitably can bulging, air bag must after bulging in air flue inside and outside So lead to airway narrows to a certain extent.

Utility model content

The technical problem to be solved by the present invention is to provide a kind of variable tracheal catheter of diameter of brand new, The tracheal catheter in actual use there is no air bag bulging leads to airway narrows in air flue the problem of.

In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution：A kind of variable gas of diameter Pipe conduit, including catheter body, support bar and the lockable mechanism for being connected to catheter body；

The catheter body includes at least the stretch section that is located at its leading portion and can stretch along its length, the stretch section edge Its internal diameter and outer diameter become smaller after length direction stretches；

The support bar is used to support stretch section and is at tensional state；

The lockable mechanism is used to carry out limitation locking to support bar so that the support bar keeps the branch to stretch section Support；

After the lockable mechanism is released to the limitation locking of support bar, the support bar cancels the support force of stretch section, The stretch section bounces back under own resilience effect, and in retraction process, the internal diameter and outer diameter of the stretch section become larger.

In one embodiment of the utility model, the whole length of the catheter body is stretchable stretch section；

The support bar at least two；

It is equipped in the tube wall of the catheter body at least with the equal number of blind hole of support bar, the blind hole is along catheter body Length direction open up；

The lockable mechanism includes being fixedly connected on catheter body rear end and non-stretchable hollow joint, described hollow to connect It is offered on head and has been connected through a screw thread a lid, the lid with the corresponding through-hole of the blind hole, the hollow joint top Sub- middle part is axial to offer venthole；

The length of the support bar is more than the sum of blind hole and the depth of through-hole, after the support bar via through holes are inserted into blind hole, When the catheter body is not stretched, there are gaps between the peripheral surface of the support bar and blind hole hole wall；

The support bar is inserted into blind hole, and pushing against the rear end of the support bar can make catheter body stretch spindle, by institute It states lid and is threaded io hollow joint, the lid can push down the rear end of support bar so that the support bar is kept to conduit The support of ontology；

After the lid is screwed from hollow joint, the support bar cancels the support force of catheter body, institute It states catheter body to bounce back under own resilience effect, in retraction process, the internal diameter and outer diameter of the catheter body become larger.

In another embodiment of the utility model, the variable tracheal catheter of the diameter further includes one and is used for Moulding moulding tube core is carried out to catheter body, the moulding tube core is inserted in catheter body, and the moulding tube core can be intubated It is extracted out from catheter body afterwards.

In another embodiment of the utility model, the catheter body is equipped with air bag, and the air bag can be with conduit Ontology stretches and retraction, the air bag are fixedly connected with catheter body.

Wherein, the part that the support bar is inserted into blind hole includes the cylindrical section of multiple coaxial arrangements, the multiple coaxial The diameter of the cylindrical section of setting is sequentially increased backward from the front end of support bar, and the blind hole is and the corresponding ladder of support bar Hole.

Preferably, spiral elastic metallic yarn is equipped in the tube wall of the catheter body.

Wherein, the lockable mechanism further includes middle part and opens leachy gasket, is offered on the gasket and support bar phase Matched location hole, the support bar are equipped with flange, offer on the top end face of the hollow joint and through-hole is coaxial sinks Head bore, the support bar rear end are threaded through in the location hole of gasket, and the bottom end of the gasket abuts against flange and can be depressed into In counter sink, the lid pushes down the rear end of support bar by pushing down gasket so that the support bar is kept to catheter body Support.

Wherein, the bottom of the hollow joint is equipped with a tubular junction, and correspondence is opened on the rear end face of the catheter body Equipped with an annular groove, the tubular junction is inserted into annular groove and is fixedly connected with the madial wall of annular groove and lateral wall, from An expansion sleeve is filled in toward its rear end, during the expansion sleeve plug to catheter body rear end outward at the front opening of the catheter body Squeeze the madial wall of annular groove so that the madial wall of the annular groove stands tightly against the inner peripheral surface of tubular junction.

Preferably, the catheter body is made of medical grade silicon rubber, and the elastic metallic yarn is diameter 0.05-0.15mm Spring steel wire.

Further, the outer cover of the catheter body is equipped with garter spring, and the peripheral surface of the tubular junction is equipped with anticreep Slot, the garter spring wale the lateral wall of annular groove in anti-be disengaged from the groove.

The variable tracheal catheter of diameter provided by the utility model is stretchable by being set in catheter body leading portion Stretch section（It will be appreciated by those skilled in the art that the stretch section includes at least the part that catheter body is inserted into tracheae through glottis, if Stretch section is too short, will be unable to achieve the purpose that mitigate glottis and tracheal injury on the basis of existing conduit）, pass through support bar Stretch section stretching attenuates, and stretch section outer diameter can reduce the damage to glottis and tracheae in catheterization procedure after becoming smaller, and mitigates postoperative Sore-throat.After conduit is inserted into tracheae, the limitation locking to support bar, after support force is cancelled, elasticity can be released by lockable mechanism Section is retracted bullet next time in own resilience effect so that its outer diameter and internal diameter are restored to size when being not stretched（Meet gas The size of pipe conduit airway diameter standard）, provided so as to attract and prevent accidentally to inhale for airway patency, ventilation oxygen-supplying, respiratory tract etc. Condition reaches trachea cannula treatment purpose.The variable tracheal catheter of above-mentioned diameter employs entirely different with background technology New construction, air flue supportted not against air bag it is big, therefore there is no air bag bulging leads to airway narrows in air flue the problem of.

Description of the drawings

Fig. 1 is oral trachea cannula schematic diagram in the prior art；

Fig. 2 is the overall structure diagram of embodiment 1；

Fig. 3 is the overall structure diagram of embodiment 2；

Fig. 4 is the overall structure diagram of support bar in embodiment 1 and embodiment 2；

Fig. 5 is the overlooking the structure diagram of hollow joint in embodiment 1 and embodiment 2；

Fig. 6 is the present invention looks up structural representation of hollow joint in embodiment 1 and embodiment 2；

Fig. 7 is hollow joint shown in Fig. 5 in the sectional view in A-A directions；

Fig. 8 is the overlooking the structure diagram of lid in embodiment 1 and embodiment 2；

Fig. 9 is lid shown in Fig. 8 in the sectional view in A-A directions；

Figure 10 is the overlooking the structure diagram of gasket in embodiment 1 and embodiment 2；

Figure 11 is gasket shown in Figure 10 in the sectional view in A-A directions；

Figure 12 is the overlooking the structure diagram of expansion sleeve in embodiment 1 and embodiment 2；

Figure 13 is expansion sleeve shown in Figure 12 in the sectional view in A-A directions；

Figure 14 is the overlooking the structure diagram of catheter body in embodiment 1 and embodiment 2；

Figure 15 is the partial enlarged view at A positions in Fig. 2；

Figure 16 is the partial enlarged view at B positions in Fig. 2；

In figure：

1 --- catheter body 2 --- support bar

3 --- locking structure 4 --- moulding tube cores

5 --- air bag 6 --- expansion sleeves

1a --- blind hole 1b --- annular groove

2a --- cylindrical section 2b --- flange

3a --- hollow joint 3b --- lid

3c --- gasket 3a1 --- through-hole

3a2 --- counter sink 3a3 --- tubular junction

3c1 --- location hole.

Specific embodiment

In the description of the present invention, it is to be appreciated that term " " center ", " on ", " under ", "front", "rear", The orientation or position relationship of the instructions such as " top ", " bottom ", " interior ", " outer " are based on orientation shown in the drawings or position relationship, are only The utility model must have specific with the device or element for simplifying description rather than instruction or hint meaning for ease of description Orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.

All embodiments of the utility model are based on following design：First, the variable tracheal catheter master of the diameter To include 3 three parts of catheter body 1, support bar 2 and lockable mechanism, set internal diameter and outer diameter after stretching equal in catheter body 1 The stretch section to become smaller, to achieve the purpose that mitigation glottis and tracheal injury, the stretch section include at least on the basis of existing conduit Catheter body 1 is inserted into the part of tracheae through glottis（Can certainly catheter body 1 all be entirely stretchable stretch section）.Its Secondary, the utility model supports stretch section to be at tensional state by support bar 2, while by lockable mechanism 3 to support bar 2 Carry out limitation locking so that support bar 2 is fixed relative to elastic fragment position, so as to stablize the support maintained to stretch section；When After stretch section is inserted to tracheal strips appropriate depth, lockable mechanism 3 is unclamped, the limitation locking to support bar 2 is released, due to support bar 2 The support force of stretch section is cancelled, stretch section can generate retraction under own resilience effect, in retraction process, stretch section it is interior Diameter and outer diameter become larger so that its outer diameter and internal diameter are restored to size when being not stretched（It is straight to meet tracheal catheter air flue The size of diameter standard）, condition is provided so as to attract and prevent accidentally to inhale for airway patency, ventilation oxygen-supplying, respiratory tract etc., reaches tracheae It is intubated treatment purpose.

The design of the utility model is more clearly understood that for the ease of those skilled in the art, below by 2 embodiments To elaborate to it.

Embodiment 1：

As shown in Fig. 2, Fig. 8-11, Figure 14 and 15, in the present embodiment, the whole length of catheter body 1 is stretchable Stretch section；Support bar 2 at least two（Scheme is 4 support bars in figure）；Be equipped in the tube wall of catheter body 1 at least with branch Stay 2 equal number of blind hole 1a, blind hole 1a are opened up along the length direction of catheter body 1；Lockable mechanism 3 includes being fixedly connected on It is offered and the corresponding through-holes of blind hole 1a on 1 rear end of catheter body and non-stretchable hollow joint 3a, hollow joint 3a 3a1, hollow joint 3a top have been connected through a screw thread a lid 3b, and axially venthole is offered in the middle part of lid 3b；Support bar 2 Length is more than the sum of depth of blind hole 1a and through-hole 3a1, after 2 via through holes 3a1 of support bar is inserted into blind hole 1a, catheter body 1 not by During stretching, there are gaps between the peripheral surface of support bar 2 and blind hole 1a hole walls（For tensional state in figure, the gap in figure not It shows）；Support bar 2 is inserted into blind hole 1a, and the rear end of pushing and pressing support bar 2 can make catheter body 1 stretch spindle, by lid 3b spiral shells Line is connected to hollow joint 3a, and lid 3b can push down the rear end of support bar 2 so that support bar 2 keeps the branch to catheter body 1 Support；After lid 3b is screwed from hollow joint 3a, support bar 2 cancels the support force of catheter body 1, catheter body 1 It bounces back under own resilience effect, in retraction process, the internal diameter and outer diameter of catheter body 1 become larger.

From the above, it can be seen that the variable tracheal catheter of diameter provided in this embodiment is made by support bar 2 The stretching of catheter body 1 attenuates, 1 outer diameter of catheter body becomes smaller the damage that can be reduced in catheterization procedure to glottis and tracheae, subtracts Light postoperative sore-throat.In actual use, catheter body 1 is first inserted to tracheal strips appropriate depth, then unclamping lid 3b can incite somebody to action The rear end release of support bar 2, the support force that support bar 2 makes catheter body 1 keep tensional state at this time are cancelled, and catheter body 1 is returned Contracting, outer diameter and internal diameter are restored to size when being not stretched（Meet the size of tracheal catheter airway diameter standard）, so as to Attract for airway patency, ventilation oxygen-supplying, respiratory tract and prevent accidentally suction etc. from providing condition, reach trachea cannula treatment purpose.Obviously, The variable tracheal catheter of above-mentioned diameter employs the new construction entirely different with background technology document, since it is not against gas Capsule air flue is supportted it is big, therefore there is no air bag bulging leads to airway narrows in air flue the problem of.

In the present embodiment, as shown in Fig. 1 and 16, air bag 5 is additionally provided in catheter body 1, air bag 5 can be with catheter body 1 It stretches and retraction, air bag 5 is fixedly connected with catheter body 1.It should be noted that air bag 5 it is not necessary to component, it is practical should Used time, the internal diameter of children is in the conduit of below 5.5mm, it may be unnecessary to air bag 5, and the teenager of 8 years old or more and adult use Conduit, it is general to select the structure with air bag 5.

As a kind of preferred structure, as shown in Figure 4, the part that above-mentioned support bar 2 is inserted into blind hole 1a includes multiple same The cylindrical section 2a of axis setting, the diameter of the cylindrical section 2a of above-mentioned multiple coaxial arrangements are sequentially increased backward from the front end of support bar 2, Blind hole 1a be and 2 corresponding stepped hole of support bar.Support bar 2 and blind hole 1a by support bar 2 and can be led using hierarchic structure Active force between tube body 1 is accordingly dispersed to each section, so as to reduce the hardness requirement to support bar 2, avoids because of catheter body 1 Screen resilience excessive the problem of 2 severe bends of support bar is caused even to fracture.

In the present embodiment, it is additionally provided with spiral elastic metallic yarn in the tube wall of catheter body 1（Spiral elasticity gold Belong to silk to be not shown in the accompanying drawings）.Making the material of catheter body 1 must select suitable hardness flat when excessively soft to collapse to avoid it （Flat collapse of conduit will influence smoothness of ventilating）, after elastic metallic yarn is set in the pipe wall, it is possible to which selection is more soft（Elasticity system Number smaller）Material make catheter body 1 because elastic metallic yarn not only can give catheter body 1 to provide retraction screen resilience, Catheter body 1 can also be given to provide radial support power, flat influence ventilation of collapsing be avoided the problem that, in addition, more soft material also may be used Further to mitigate damage of the catheterization procedure to glottis and tracheal mucosa.

As shown in Fig. 2, Fig. 8-11 and 15, lockable mechanism 3 further includes middle part and opens leachy gasket 3c, is opened up on gasket 3c Have a location hole 3c1 to match with support bar 2, support bar 2 is equipped with flange 2b, offered on the top end face of hollow joint 3a with Counter sink 3a2 coaxial through-hole 3a1,2 rear end of support bar are threaded through in the location hole 3c1 of gasket 3c, the bottom end of gasket 3c against Live in flange 2b can be simultaneously depressed into counter sink 3a2, and lid 3b pushes down the rear end of support bar 2 by pushing down gasket 3c so that Support bar 2 keeps the support to catheter body 1.In general, lid 3b is made of rigid plastics, if 2 rear end of support bar is straight It connects and withstands on lid 3b roofs, after the time has been grown, it is possible to tiny recess is generated in lid 3b roofs inner surface, thus The smoothness that lid 3b is screwed can be influenced, and after gasket 3c is set, lid 3b is not in direct contact with 2 rear end of support bar, due to lid Sub- 3b is pressed on gasket 3c upper surfaces, even if there is tiny recess with the gasket 3c lower surfaces that 2 rear end of support bar is in direct contact, The smoothness that lid 3b is screwed is not interfered with.

As shown in Fig. 2, Fig. 5-7 and Figure 12-15, the bottom of hollow joint 3a is equipped with a tubular junction 3a3, catheter body It is corresponding on 1 rear end face to offer an annular groove 1b, tubular junction 3a3 be inserted into annular groove 1b and with the inside of annular groove 1b Wall is fixedly connected with lateral wall, and an expansion sleeve 6 is filled in toward its rear end at the front opening of catheter body 1, and expansion sleeve 6 is filled in leading The madial wall of annular groove 1b is squeezed during 1 rear end of tube body outward so that the madial wall of annular groove 1b stands tightly against tubulose connection The inner peripheral surface of portion 3a3.After the madial wall of annular groove 1b is pressed on the inner peripheral surface of tubular junction 3a3 by expansion sleeve 6, improves and lead The bonding strength of tube body 1 and tubular junction 3a3.

Preferably, in the present embodiment, catheter body 1 is made of medical grade silicon rubber, and aforementioned flexible wire is diameter The spring steel wire of 0.05-0.15mm.Further, also it is arranged with garter spring in the outside of above-mentioned catheter body 1（The garter spring is in the accompanying drawings It is not shown）, the peripheral surface of tubular junction 3a3, which is equipped with, to be prevented being disengaged from the groove（Anti- be disengaged from the groove is not shown in the accompanying drawings）, garter spring will be annular The lateral wall of slot 1b is waled in anti-be disengaged from the groove.Being waled the lateral wall of annular groove 1b by garter spring can be further in anti-be disengaged from the groove Improve the bonding strength of catheter body 1 and tubular junction 3a3.

Embodiment 2：

The present embodiment is similar with the structure of embodiment 1, and each component and its corresponding structure and connection mode are same in embodiment 1 Sample is suitable for the present embodiment, and the difference lies in the variable tracheal catheter multi-configurations of the diameter that the present embodiment is related to for the two One is used to carry out catheter body 1 moulding moulding tube core 4, as shown in figure 3, above-mentioned moulding tube core 4 is inserted in catheter body 1 In, moulding tube core 4 can be extracted out after intubation from catheter body 1.It should be noted that moulding tube core 4 can also use it is commercially available Shaping tube core substitute, if desired the tracheal catheter in embodiment 1 uses tube core auxiliary intubation when in use（It is and not all Intubation tube core is required for assist）, suitably sized next alternative, ability can be selected from existing shaping tube core completely Field technique personnel should be to the wider range of understanding of making of the moulding tube core 4, such as moulding tube core 4 can also be of the prior art Tracheal catheter optical wand for guiding or Bronchofiberscope, it might even be possible to the circle bar-like member with shaping characteristic is understood as, as long as It can realize the purpose for helping that catheter body 1 is moulding and can be extracted out after intubation.

Finally it is emphasized that in the utility model, blind hole 1a is not necessarily opened up in catheter body 1, not Only by support bar 2 be inserted into blind hole 1a could by catheter body 1 stretch attenuate, such as can also catheter body 1 inner wall or Bar-shaped trough is opened on outer wall, support bar 2 is positioned in bar-shaped trough, the front end of support bar 2 is fixedly connected with catheter body 1, in this way One, the stretching of catheter body 1 can also be attenuated by pushing against the rear end of support bar 2；Likewise, lockable mechanism 3 is also not necessarily limited in The realization method of a lid 3b is threadedly coupled on empty connector 3a, such as can be in the rear end of hollow joint 3a and support bar 2 radially Locking hole is opened up, bolt is inserted into the locking hole of hollow joint 3a and support bar 2, can also carry out limitation locking to support bar 2. It will be appreciated by those skilled in the art that realization support bar 2, which supports catheter body 1 to be at tensional state, also can be used other The technical solution of structure, and there is also a variety of different structures for lockable mechanism 3 of the realization to the progress limitation locking of support bar 2, are Simplify statement, will not enumerate.

Above-described embodiment is the preferable implementation of the utility model, is appointed under the premise of the technical program design is not departed from What obvious replaces is within the protection scope of the utility model.

In order to allow those of ordinary skill in the art more easily understand the utility model relative to the prior art improvement it Place, some attached drawings of the utility model and description have been simplified, and for the sake of clarity, and present specification is omitted one A little other elements, those of ordinary skill in the art should be aware that these elements omitted also may make up the interior of the utility model Hold.

Claims

1. the variable tracheal catheter of diameter, including catheter body（1）, support bar（2）And it is connected to catheter body（1）'s Lockable mechanism（3）；

The catheter body（1）Including at least positioned at its leading portion and the stretch section that can stretch along its length, the stretch section edge Its internal diameter and outer diameter become smaller after length direction stretches；

The support bar（2）It is used to support stretch section and is at tensional state；

The lockable mechanism（3）For to support bar（2）Carry out limitation locking so that the support bar（2）It keeps to stretch section Support；

The lockable mechanism（3）It releases to support bar（2）Limitation locking after, the support bar（2）To the support force of stretch section It cancels, the stretch section bounces back under own resilience effect, and in retraction process, the internal diameter and outer diameter of the stretch section gradually become Greatly.

2. the variable tracheal catheter of diameter according to claim 1, it is characterised in that：The catheter body（1）'s Whole length is stretchable stretch section；

The support bar（2）At least two；

The catheter body（1）Tube wall in be equipped at least with support bar（2）Equal number of blind hole（1a）, the blind hole（1a） Along catheter body（1）Length direction open up；

The lockable mechanism（3）Including being fixedly connected on catheter body（1）Rear end and non-stretchable hollow joint（3a）, it is described Hollow joint（3a）On offer and the blind hole（1a）Corresponding through-hole（3a1）, the hollow joint（3a）Top passes through It is threaded with a lid（3b）, the lid（3b）Middle part axially offers venthole；

The support bar（2）Length be more than blind hole（1a）With through-hole（3a1）The sum of depth, the support bar（2）Via through holes （3a1）It is inserted into blind hole（1a）Afterwards, the catheter body（1）When being not stretched, the support bar（2）Peripheral surface and blind hole（1a） There are gaps between hole wall；

The support bar（2）It is inserted into blind hole（1a）In, push against the support bar（2）Rear end can make catheter body（1）It stretches and becomes It is elongated, by the lid（3b）It is threaded io hollow joint（3a）, the lid（3b）Support bar can be pushed down（2）Rear end, Cause the support bar（2）It keeps to catheter body（1）Support；

By the lid（3b）From hollow joint（3a）On screw after, the support bar（2）To catheter body（1）Support Power is cancelled, the catheter body（1）It bounces back under own resilience effect, in retraction process, the catheter body（1）Internal diameter It is become larger with outer diameter.

3. the variable tracheal catheter of diameter according to claim 2, it is characterised in that：One is further included for leading Tube body（1）Carry out moulding moulding tube core（4）, the moulding tube core（4）It is inserted in catheter body（1）In, the moulding tube core （4）It can be after intubation from catheter body（1）Middle extraction.

4. the variable tracheal catheter of diameter according to claim 2, it is characterised in that：The catheter body（1）On Equipped with air bag（5）, the air bag（5）It can be with catheter body（1）It stretches and bounces back, the air bag（5）With catheter body（1）It is fixed Connection.

5. the variable tracheal catheter of diameter according to any one in claim 2-4, it is characterised in that：The branch Stay（2）It is inserted into blind hole（1a）In part include the cylindrical sections of multiple coaxial arrangements（2a）, the circle of the multiple coaxial arrangement Shell of column（2a）Diameter from support bar（2）Front end be sequentially increased backward, the blind hole（1a）For with support bar（2）It is corresponding Stepped hole.

6. the variable tracheal catheter of diameter according to any one in claim 2-4, it is characterised in that：It is described to lead Tube body（1）Tube wall in be equipped with spiral elastic metallic yarn.

7. the variable tracheal catheter of diameter according to any one in claim 2-4, it is characterised in that：The lock Locking mechanism（3）It further includes middle part and opens leachy gasket（3c）, the gasket（3c）On offer and support bar（2）Match Location hole（3c1）, the support bar（2）It is equipped with flange（2b）, the hollow joint（3a）Top end face on offer and lead to Hole（3a1）Coaxial counter sink（3a2）, the support bar（2）Rear end is threaded through gasket（3c）Location hole（3c1）In, it is described Gasket（3c）Bottom end abut against flange（2b）And counter sink can be depressed into（3a2）In, the lid（3b）By pushing down pad Piece（3c）To push down support bar（2）Rear end so that the support bar（2）It keeps to catheter body（1）Support.

8. the variable tracheal catheter of diameter according to any one in claim 2-4, it is characterised in that：In described Empty connector（3a）Bottom be equipped with a tubular junction（3a3）, the catheter body（1）Rear end face on correspondence offer a ring Shape slot（1b）, the tubular junction（3a3）It is inserted into annular groove（1b）In and and annular groove（1b）Madial wall and lateral wall consolidate Fixed connection, from the catheter body（1）Front opening at toward its rear end fill in an expansion sleeve（6）, the expansion sleeve（6）Plug is extremely Catheter body（1）Annular groove is squeezed during rear end outward（1b）Madial wall so that the annular groove（1b）Madial wall tightly support Against tubular junction（3a3）Inner peripheral surface.

9. the variable tracheal catheter of diameter according to claim 6, it is characterised in that：The catheter body（1）It adopts It is made of medical grade silicon rubber, the elastic metallic yarn is the spring steel wire of diameter 0.05-0.15mm.

10. the variable tracheal catheter of diameter according to claim 8, it is characterised in that：The catheter body（1）'s Outer cover is equipped with garter spring, the tubular junction（3a3）Peripheral surface be equipped with it is anti-be disengaged from the groove, the garter spring is by annular groove（1b）'s Lateral wall is waled in anti-be disengaged from the groove.