CN216797619U - Laryngoscope with controllable and changeable caliber - Google Patents

Abstract

The utility model discloses a laryngoscope with controllable and variable aperture, which comprises a handle, a guide channel at the tail end of the handle and a separation groove on the guide channel, wherein the guide channel is formed by surrounding a guide sheet and a tongue-pressing sheet which are arranged at the tail end of the handle, the guide sheet and the tongue-pressing sheet are positioned at the upper side and the lower side, the separation groove is at least arranged at one side of the guide channel and extends along the axial direction of the guide channel, so that at least one side of the tail end of the guide sheet and the tongue-pressing sheet is separated, and the separation section of the guide sheet and/or the tongue-pressing sheet is allowed to generate elastic deformation, so that the aperture of the tail end of the guide channel is expanded. The guide piece is close to the tongue depressor piece, can the endotracheal tube of roof pressure guide channel for endotracheal tube is close to the tongue depressor piece direction, and endotracheal tube can more accurately get into the glottis, reduces patient's uncomfortable sense when getting into. The tail ends of the guide sheet and the tongue pressing sheet are provided with deformed spaces, the large-size tracheal catheter can be opened after entering, the large-size tracheal catheter can conveniently pass through, and the operation is more convenient and faster.

Description

Laryngoscope with controllable and changeable caliber

Technical Field

The utility model relates to the field of medical instruments, in particular to a laryngoscope with controllable and variable aperture.

Background

Along with the needs of patients and the development of the technology, the electronic video laryngoscope technology solves the defects of the traditional laryngoscope method, the display part displays the images shot by the camera part in real time, and the intubation operation carried out on the patients is more intuitive and easier.

When intubation is carried out, the glottis center position is the optimal position of the intubation, it is very important to fully expose the epiglottis and the glottis in the intubation process, and the trachea catheter needs to be smoothly sent to the glottis center position directly related to the success of the intubation. Although the guiding channel arranged on the laryngoscope blade plays a role in guiding the endotracheal tube, the guiding channel is only suitable for the endotracheal tube with proper size, the endotracheal tube with small size is easy to shift when passing through the guiding channel, the extending angle of the endotracheal tube has large deviation with the axis of the camera, the endotracheal tube is difficult to be guided to the right position smoothly, and the patient feels bad after the endotracheal tube is deviated, thereby affecting the treatment effect.

SUMMERY OF THE UTILITY MODEL

In order to overcome at least one of the technical problems in the prior art, the utility model provides a laryngoscope with controllable and variable caliber, which can adapt to the passing of tracheal tubes with different sizes, reduce the deviation of the tracheal tubes and improve the treatment effect.

The laryngoscope with the controllable and variable caliber comprises a handle, a guide channel at the tail end of the handle, a separation groove on the guide channel and a limiting device, wherein the guide channel is formed by surrounding a guide sheet and a tongue pressing sheet which are arranged at the tail end of the handle, the guide sheet and the tongue pressing sheet are positioned at the upper side and the lower side, the separation groove is at least arranged at one side of the guide channel and extends forwards along the tail end of the guide channel, at least the tail end of the guide sheet and the tongue pressing sheet at the tail end of the guide channel can be separated from each other, so that the tail end caliber of the guide channel is expanded, and the limiting device is arranged on the handle and/or the guide channel and limits the distance of the expansion of the tail end caliber of the guide channel.

The laryngoscope with the controllable and variable caliber has the following beneficial effects: the tail end of the guide channel can be expanded, the shape and the size of the guide channel are reduced when the guide channel is not expanded, the guide channel can more conveniently enter the throat, foreign body sensation of a patient in laryngoscope treatment can be reduced, and use experience is improved. The tail ends of the guide sheet and the tongue depressor can be elastically deformed, the guide channel can be automatically expanded after the large-size endotracheal tube is inserted, the operation is more convenient and quicker, the smaller guide channel can provide better guiding effect after the small-size endotracheal tube is inserted, the axis of the endotracheal tube is approximately parallel to the direction of the tongue depressor, the image acquisition device in the guide channel can accurately see the picture of the entering direction of the endotracheal tube, and the diagnosis and the judgment can be accurately carried out. The limiting device can draw the guide piece, so that the guide piece is prevented from being deformed after being pushed open, and the tail end caliber of the guide channel is prevented from being expanded too much to hurt the oral cavity and the throat of a patient.

In some embodiments of the laryngoscope having a controlled change in the aperture, the distal end of the guide blade is brought towards the blade to reduce the aperture of the distal end of the guide channel. The guide piece can be used for jacking the tracheal catheter in the guide channel, so that the tracheal catheter is close to the tongue pressing piece in the direction, the front end of the tracheal catheter is coaxial with the guide channel, the tracheal catheter can accurately enter a glottis forwards, and discomfort of a patient is reduced when the tracheal catheter enters the glottis.

In some embodiments of the laryngoscope with controllable and variable aperture, the handle is closed at the distal end, and the guide blade is provided with an opening which is an entrance of the guide channel. When the medical instrument is used, the inlet faces to the upper side and the side surface, the inlet can be visually seen, the instrument and the catheter can be conveniently inserted, and the larger the opening is, the easier the instrument and the catheter can be pulled out, so that the medical instrument is convenient to operate.

In some embodiments of the laryngoscope with controllable and variable aperture, the guide blade is separate from the handle, the guide blade is connected to the blade or handle by a resilient means, and the resilient means draws the guide blade towards the blade. The rebounding device assists the guide piece to reset, and the connecting and resetting effects are achieved.

In some embodiments of the laryngoscope with controllable and variable caliber, the guiding channel is provided with a magnetic device at the tail end, the magnetic device comprises two groups of magnetic poles which attract each other, and the two groups of magnetic poles are respectively arranged on the tongue-pressing piece and the guiding piece. The two groups of magnetic poles are close to each other to drive the tongue depressor sheet and the guide sheet to be close to each other, so that the tail end caliber of the guide channel is always in a contracted state, and the size of the tail end caliber is reduced.

In some embodiments of the laryngoscope with controllable and variable caliber, two ends of the limiting device are respectively hinged with the tongue-pressing piece and the guide piece. The guide piece and the tongue depressor piece are limited by the limiting device, when the guide piece is separated from the tongue depressor piece, two ends of the limiting device rotate, when the limiting device rotates to a limit position, the end caliber of the guide channel is at the maximum, and the size of the guide channel can be adjusted by changing the length of the limiting device.

In some embodiments of the laryngoscope with controllable and variable caliber, the limiting device is telescopic, the limiting strip is stretched when the tongue-pressing piece is separated from the guiding piece, and the limiting strip is compressed to draw the tongue-pressing piece to be close to the guiding piece, so that the quick change of the caliber of the guiding channel can be realized.

In some embodiments of the laryngoscope with controllable and variable caliber, the limiting device comprises a limiting block, the limiting block is arranged on the guide sheet and/or the tongue depressor and/or the handle, and when the tail end of the guide channel expands, the guide sheet presses the limiting block to be subjected to resistance opposite to the expanding direction of the guide channel.

In some embodiments of the laryngoscope with controllable and variable aperture, the guide blade and/or the tongue blade is provided with a baffle on both sides. The guiding and limiting function can be achieved, instruments or catheters in the guiding channel are prevented from extending out of gaps between the guiding sheet and the tongue pressing sheet, and the guiding and limiting device is safer and more controllable.

In some embodiments of the laryngoscope with controllable and variable caliber, the guide channel is also internally provided with an image acquisition device, and an image of the tail end of the laryngoscope can be visually acquired through the image acquisition device, so that the throat and the glottis can be conveniently observed.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. Obviously, the described figures are only some embodiments of the utility model, not all embodiments, and other designs and figures can be obtained by those skilled in the art without inventive effort, based on these figures:

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a third embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a fourth embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a fifth embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a sixth embodiment of the present invention;

FIG. 7 is an axial cross-sectional view of a seventh embodiment of the present invention;

FIG. 8 is a rear view of the structure of the eighth embodiment of the present invention;

fig. 9 is a rear view showing the structure of the ninth embodiment of the present invention.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; the connection can be mechanical connection or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to each embodiment in fig. 1 to 9, a variable laryngoscope is disclosed, which comprises a handle 1, a guide channel 4 at the tail end of the handle 1, a separation groove on the guide channel 4 and an intratubular device, wherein the guide channel 4 is formed by surrounding a guide sheet 3 and a pressure tongue sheet 2 which are arranged at the tail end of the handle 1, the guide sheet 3 and the pressure tongue sheet 2 are positioned at the upper side and the lower side, and a gap between the guide sheet 3 and the pressure tongue sheet 2 is the guide channel 4. The separation groove is at least arranged on one side of the guide channel 4, extends forwards from the tail end of the guide channel 4, can extend along the axis of the guide channel 4 and also can extend along an arc line, and the guide sheets 3 and the tongue-pressing sheets 2 on the two sides of the separation groove can be separated from each other after external force is applied, so that the tail end caliber of the guide channel 4 can be compressed or expanded. The limiting device is arranged on the handle 1 and/or the guide channel 4, and limits the expanding distance of the tail end caliber of the guide channel 4. The limiting device can limit the moving distance of the guide sheet 3 and prevent the tail end caliber of the guide channel 4 from expanding too much to hurt the oral cavity and the throat of a patient

The connection of the handle 1 and the guide piece 3 and the tongue-pressing piece 2 of the guide channel 4 includes, but is not limited to, integrally molding as in the first embodiment, integrally fastening as in the second embodiment, or integrally bonding as in the embodiment not shown, so long as the guide piece 3 and the tongue-pressing piece 2 are fixed to the end of the handle 1.

Referring to each embodiment in fig. 3 to 6, an image capturing device 6 is further disposed in the guiding channel 4, and a connection cable of the image capturing device 6 passes through the guiding channel 4 to be electrically connected with a control module in the handle 1, or the image capturing device 6 directly transmits data to a control device inside the handle 1 or outside the laryngoscope through a wireless transmission module for storage. The image acquisition device 6 can shoot the terminal image of laryngoscope, can show the picture that image acquisition device 6 shot after handle 1 is connected with display device, makes things convenient for the doctor nurse to observe the inside condition of roar.

4 ends of the guide channel can be expanded, the shape and size of the guide channel are reduced when the guide channel is not expanded, the guide channel can more conveniently enter a throat, foreign body sensation of a patient in laryngoscope treatment can be reduced, and use experience is improved. The guide piece 3 and the end of the tongue depressor piece 2 can be elastically deformed, the guide channel 4 can be automatically expanded after the large-size endotracheal tube is inserted, the operation is more convenient and faster, after the small-size endotracheal tube is inserted, the smaller guide channel 4 can provide better guiding effect, the axis of the endotracheal tube is approximately parallel to the direction of the tongue depressor piece 2, the endotracheal tube can accurately enter the glottis after the laryngoscope is inserted in place, the image acquisition device in the guide channel 4 can also be matched with the direction in which the endotracheal tube enters more accurately, and diagnosis and treatment can be conveniently carried out.

The guide piece 3 is close to the tongue-pressing piece 2 and can be used for jacking the tracheal catheter in the guide channel 4, so that the tracheal catheter is close to the tongue-pressing piece 2, the axis of the tracheal catheter is approximately parallel to the direction of the tongue-pressing piece 2, and the tracheal catheter can enter a glottis along the tongue-pressing piece 2 more accurately. Especially, the small-sized instruments and the tracheal catheters can be pushed to the tongue pressing piece 2 by the guide piece 3, the tracheal catheter extending out of the guide channel 4 cannot be tilted or displaced left and right, the throat of a patient cannot be pressed, and the discomfort of the patient during entering is reduced. The arrangement of the separation groove enables the tail ends of the guide sheet 3 and the tongue pressing sheet 2 to have movable gaps, when large-size endotracheal tubes and instruments enter the guide channel 4, the outlets can be automatically slightly opened, large-size instruments can pass through the guide channel conveniently, the passing in and out of the instruments with different sizes and models can be met, and the operation is more convenient and quicker.

In the first embodiment of fig. 1, the handle 1, the tongue-pressing piece 2 and the guide piece 3 are integrally formed, and the guide piece 3 and the tongue-pressing piece 2 are directly fixed to the distal end of the handle 1. The guide piece 3 and the tongue pressing piece 2 are two separated blades, two separation grooves of the guide channel 4 are arranged and extend along the axis at the left side and the right side of the guide channel 4 respectively, and the guide piece 3 and the tongue pressing piece 2 are completely separated. The tip of the guide piece 3 is arranged to be turned up toward the tongue presser 2, so that the tip diameter of the guide passage 4 becomes smaller. Tongue depressor piece 2 and 3 separation settings of guide piece make two blades all possess certain elasticity, no matter be metal or plastic material, can both carry out the elastic deformation of certain degree. The tail end of the guide channel 4 is provided with a limiting device which is a hard limiting strip 11, and two ends of the limiting strip 11 are respectively hinged with the tongue pressing piece 2 and the guide piece 3. When the guide channel 4 is not expanded, the limiting strips 11 are approximately parallel to the guide channel 4, when the guide sheet 3 is pushed open, when the guide channel 4 is expanded, the limiting strips 11 rotate simultaneously, one end of the guide sheet 3 rotates around one end of the tongue pressing sheet 2, and because the length of the limiting strips 11 is fixed, when the limiting strips 11 are perpendicular to the tongue pressing sheet 2, the tail end of the guide channel 4 is expanded to the maximum value. In a development of the first embodiment, which is not shown, the limiting device is formed by a plurality of limiting strips 11 which are hinged end to end, and the two ends of the limiting device are hinged with the tongue pressing piece 2 and the guide piece 3 respectively. The limiting device can also be provided with a plurality of limiting strips 11 which are hinged with each other to form a net-shaped truss structure, the truss can stretch, and the upper end and the lower end of the truss are respectively hinged with the tongue pressing piece 2 and the guide piece 3.

In an extension of the first embodiment, not shown, the connection between the guiding plate 3 and the handle 1 is provided with a flexible connection section with elasticity, and the flexible connection section provides elasticity to assist the guiding plate 3 in bending and resetting.

In the second embodiment shown in fig. 2, the tongue depressor 2 and the guide piece 3 are integrally formed with the upper and lower portions of the handle 1, respectively, and the upper and lower portions are fastened to each other to form the laryngoscope. Two separation grooves of the guide channel 4 extend backwards from the middle section of the left side and the right side of the guide channel 4, so that the guide sheet 3 is separated from the back half section of the tongue-pressing sheet 2. The tip of the guide piece 3 is tilted toward the tongue-presser 2, so that the tip diameter of the guide passage 4 becomes smaller. The guide piece 3 is flexible silica gel material, and whole guide piece 3 all possesses good elasticity, opens and resets all very fast. Tongue depressor piece 2 and the 3 latter half sections separation settings of guide piece make the end of two blades all possess certain elasticity, no matter be metal or plastic material, can both carry out the elastic deformation of certain degree. According to the material of guide piece 3 and tongue depressor piece 2 to and the degree that needs the deformation, can set up different length and position with the partition groove, as long as can reach the function of separation guide piece 3 and tongue depressor piece 2. The limiting device is a hard limiting strip 11, and two ends of the limiting strip 11 are hinged to the guide piece 3 and the tongue pressing piece 2 respectively.

In the third embodiment of fig. 3, the tongue-pressing piece 2 and the guide piece 3 are formed integrally with the handle 1, but only one separation groove is provided, and the separation groove extends from the front to the back along the axis on the left side of the guide channel 4, so that only one side of the guide channel 4 can be opened and closed. In order to increase the elasticity of the guide piece 3, the tip of the guide piece 3 is extended outward, and the tip of the guide piece 3 is reduced in thickness. The third embodiment is limited by the side of the guide piece 3 connected with the tongue-pressing piece 2, so that the guide channel 4 is not expanded, and the caliber of the tail end is slightly changed.

In the embodiments shown in fig. 4 to 9, the guide piece 3 is separated from the handle 1, the guide piece 3 in the fourth to seventh embodiments is connected with the tongue-pressing piece 2 through an elastic connecting device, and in the sixth and seventh embodiments, the guide piece 3 is connected with the handle 1 through an elastic connecting device, and the elastic connecting device pulls the guide piece 3 to approach the tongue-pressing piece 2 to reduce the caliber of the guide channel 4, so as to assist the reset of the guide piece 3, and thus, the connection and reset functions are realized. The various configurations of the elastic connection device will be explained by the following embodiments.

The elastic connecting device in the fourth, fifth and sixth embodiments comprises an elastic member 7, wherein the stretching end of the elastic member 7 is fixed on the guiding plate 3 and the tongue pressing plate 2 respectively, the guiding plate 3 and the tongue pressing plate 2 are drawn by the elastic member 7, and the stretching and compressing of the elastic member 7 drives the tail end of the guiding channel 4 to open and close. In the fourth embodiment, the elastic member 7 is a spring, several springs are arranged at the connection of the guide piece 3 and the tongue depressor 2, and two ends of the spring are respectively connected with the guide piece 3 and the tongue depressor 2. In the fifth embodiment, the elastic member 7 is a U-shaped spring, and the spring pieces on both sides of the U-shaped spring are respectively connected with the front ends of the guide piece 3 and the tongue pressing piece 2. In the sixth embodiment, the elastic member 7 is a flexible adhesive tape, the upper end and the lower end of each flexible adhesive tape are respectively fixed on the guide sheet 3 and the tongue pressing sheet 2, the flexible adhesive tape has elasticity, and the stretching and the compression of the flexible adhesive tape drive the tail end of the guide channel 4 to open and close. The elastic piece 7 can also adopt different materials and different shapes, but the elastic piece 7 must have the extension and the reset performance, and the stretching end of the elastic piece 7 when being deformed is connected with the guide piece 3 and the tongue pressing piece 2 respectively.

In the fourth and fifth embodiments, the limiting device is a limiting spring 12, the limiting spring 12 is disposed at the end of the guide channel 4, and both ends of the limiting spring 12 are respectively fixed on the guide sheet 3 and the tongue-pressing sheet 2, in the sixth embodiment, the limiting device is a limiting rubber strip 13, the limiting rubber strip 13 is disposed at the end of the guide channel 4, and both ends of the limiting rubber strip 13 are respectively fixed on the guide sheet 3 and the tongue-pressing sheet 2. In three embodiments, the guide plate 3 and the tongue pressing plate 2 are connected by an elastic element, so that the tail end of the guide channel 4 is pulled, the elastic element is stretched by thrust, and the caliber of the guide channel 4 automatically expands. The elastic part is more convenient to produce, mount and fix, and the production and assembly efficiency is higher. In other embodiments, not shown, the limiting device is a pulling rope or a limiting tube partially folded and extended like a suction tube.

Referring to the seventh embodiment, the elastic connection device includes a torsion spring 9, the guiding plate 3 is hinged to the tongue pressing plate 2, the torsion spring 9 is sleeved on the hinged rotating shaft, and the pin of the torsion spring 9 is located in the guiding channel 4 and faces the handle 1. The guide piece 3 and the tongue pressing piece 2 are positioned at two sides of a pin of the torsion spring 9, the pin end of the torsion spring 9 keeps a trend of outward opening at ordinary times, the guide piece 3 is pushed towards the tongue pressing piece 2, and the caliber of the tail end of the guide channel 4 is reduced. When the tail end of the guide piece 3 is pushed outwards, the guide piece 3 is far away from the tongue-pressing piece 2, so that the pins of the torsion spring 9 approach inwards to expand the tail end of the guide channel 4, and the stressed deformation of the torsion spring 9 drives the tail end of the guide channel 4 to open and close. The guide piece 3 at the front end of the connecting shaft is further provided with a limiting block 14, when the tail end of the guide piece 3 is pushed open, the front end of the guide piece 3 rotates to be close to the tongue pressing piece 2, and the limiting block 14 can be pushed against the tongue pressing piece 2 to limit the rotating angle of the guide piece 3, so that the tail end movement distance of the guide piece 3 is limited, and the function of limiting the caliber of the guide channel 4 is realized.

Referring to the eighth embodiment, the elastic connection device includes a torsion spring 9, the guide plate 3 is hinged to the handle 1, the torsion spring 9 is sleeved on the hinged rotation shaft, and two pins of the torsion spring 9 are disposed on the outer sides of the handle 1 and the guide plate 3. The pins are spread to have a tendency of being close to each other, the pins of the torsion spring 9 apply elasticity to the guide sheet 3 and the handle 1 at the outer side to push the guide sheet 3 to the direction of the tongue pressing sheet 2, the caliber of the tail end of the guide channel 4 is reduced, and the deformation of the torsion spring 9 under stress drives the tail end of the guide channel 4 to be opened and closed. The limiting device comprises a pulling rope arranged at the tail end of the guide channel 4.

Referring to the ninth embodiment, elastic connection device is including the elasticity roof 10 that can take place elastic deformation, and guide plate 3 articulates at handle 1 end through the connecting axle, elasticity roof 10 cover is established on the rotation axis, and the one end of elasticity roof 10 is fixed on the connecting axle, and the other end of elasticity roof 10 possesses elastic deformation's activity, elasticity roof 10 expansion end is located the outside of guide plate 3, and elasticity roof 10 supports to lean on and to apply elasticity for guide plate 3 in the outside, promotes guide plate 3 to tongue depressor piece 2 direction, has reduced the terminal bore of guide channel 4, and elasticity roof 10 can take place deformation when receiving outside thrust for guide plate 3's end opens, and the bending and the reset of elasticity roof 10 drive guide channel terminal 4 open and closed. In an embodiment not shown, an elastic member 7 is further added to the guide passage 4, and the elastic force is enhanced by the elastic member 7. The limiting device comprises a traction rope arranged at the tail end of the guide channel 4.

Referring to the embodiment in fig. 3 to 6, the baffles 5 are arranged on two sides of the guide plate 3 and/or the tongue depressor 2, the baffles 5 are located on two sides of the guide channel 4, and the baffles 5 can play a role in guiding and limiting, so that instruments or catheters in the guide channel 4 are prevented from protruding from a gap between the guide plate 3 and the tongue depressor 2, injury to the throat is avoided, and the throat is safer and more controllable.

In order to ensure the sealing of internal electronic elements, the tail end of the handle 1 is closed by some handles 1, an opening 8 is arranged on the guide sheet 3, the opening 8 is an inlet of the guide channel 4, the inlet faces upwards and laterally during use, the position of the inlet can be visually seen, the inlet is positioned outside the oral cavity, instruments and catheters can be conveniently inserted, and the larger the opening 8 is, the easier the opening is to pull out, so that the operation of a doctor is convenient. When the baffle 5 is arranged on both sides of the guide piece 3, a notch is also arranged on the baffle 5 on one side of the opening 8, and the notch and the opening 8 are connected to form an inlet of the guide channel 4.

Referring to 8 th and 9 th embodiments, the opening is arranged at the front end of the guide plate 3 and is positioned on one side of the guide plate 3, the opening 8 is arc-shaped, when the laryngoscope is placed in the throat, the opening 8 is positioned on the right side below the handle 1, and the upper half section of the opening 8 can extend out of the oral cavity and is suitable for being operated by the right hand to feed in and pull out the endotracheal tube. According to different user requirements, the position of the opening 8 can be arranged on the left side, and can also be arranged in different shapes.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.

Claims (10)

1. A laryngoscope of controllable change of aperture which characterized in that: comprises that

A handle (1);

the guide channel (4) is formed by surrounding a guide sheet (3) and a tongue pressing sheet (2) which are arranged at the tail end of the handle (1), and the guide sheet (3) and the tongue pressing sheet (2) are positioned on the upper side and the lower side;

the separation groove is at least arranged on one side of the guide channel (4) and extends to the front end along the tail end of the guide channel (4), and at least the tail ends of the guide sheet (3) and the tongue-pressing sheet (2) at the tail end of the guide channel (4) can be separated from each other, so that the tail end caliber of the guide channel (4) is expanded;

and the limiting device is arranged on the handle (1) and/or the guide channel (4) and limits the expanding distance of the tail end caliber of the guide channel (4).

2. A laryngoscope with controlled variation in caliber according to claim 1, wherein: the tail end of the guide sheet (3) is close to the tongue pressing sheet (2), so that the tail end caliber of the guide channel (4) is reduced.

3. A laryngoscope according to claim 1 or claim 2, wherein the laryngoscope comprises: the tail end of the handle (1) is closed, an opening (8) is formed in the guide piece (3), and the opening (8) is an inlet of the guide channel (4).

4. A laryngoscope with controlled variation in caliber according to claim 1, wherein: the guide piece (3) is separated from the handle (1), the guide piece (3) is connected with the tongue piece (2) or the handle (1) through a rebound device, and the rebound device pulls the guide piece (3) to be close to the tongue piece (2).

5. A laryngoscope with controlled variation in caliber according to claim 1, wherein: the tail end of the guide channel (4) is provided with a magnetic device, the magnetic device comprises two groups of mutually attracted magnetic poles, and the two groups of magnetic poles are respectively arranged on the tongue pressing piece (2) and the guide piece (3).

6. A laryngoscope with controlled variation in caliber according to claim 1, wherein: the two ends of the limiting device are respectively hinged with the tongue pressing piece (2) and the guiding piece (3) or the handle (1) and the guiding piece (3).

7. A laryngoscope according to claim 1 or claim 6, wherein the laryngoscope comprises: the limiting device is telescopic.

8. A laryngoscope with controlled variation in caliber according to claim 1, wherein: the limiting device comprises a limiting block, the limiting block is arranged on the guide sheet and/or the tongue depressing sheet and/or the handle, and when the tail end of the guide channel expands, the guide sheet abuts against the limiting block to bear resistance opposite to the expanding direction of the guide channel.

9. A laryngoscope with controlled variation in caliber according to claim 1, wherein: and baffles (5) are arranged on two sides of the guide sheet (3) and/or the tongue pressing sheet (2).

10. A laryngoscope with controlled variation in caliber according to claim 1, wherein: an image acquisition device (6) is further arranged in the guide channel (4).

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