JP2018079216A - Laryngoscope and laryngoscope blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laryngoscope and a laryngoscope blade which are optimal when changing a width of a blade in an oral cavity in a blade for changing a width of the blade in the oral cavity by changing a position of an auxiliary blade, which allow an operator to concentrate his/her attention on an insertion work of an insertion tube, and perform a work quickly and easily.SOLUTION: The laryngoscope comprises: a handle 10; a width variable blade 20 formed of a blade body 30 and an auxiliary blade 50 which can slide in a width direction of the blade body 30; and a dial 60 for adjusting a slide amount of the auxiliary blade 50.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a laryngoscope and a laryngoscope blade used to expose and observe a patient's larynx during tracheal intubation.

  It is very important for life support to secure an air passage for people who have difficulty breathing or stop breathing. There are various methods for securing the airway, and the most effective and most commonly performed method is tracheal intubation.

  This tracheal intubation is a treatment in which an intubation tube is inserted from the oral cavity or nasal cavity through the pharynx and larynx to the trachea so that air can be sent directly to the lungs. For this reason, tracheal intubation has the best ventilation efficiency, and is the best and best standard method among physicians for securing airways using instruments and should be mastered by all physicians. It is a procedure.

  Conventionally, tracheal intubation has been regarded as a medical practice, and it has not been permitted to perform tracheal intubation except by a doctor. However, after that, as one of the methods for securing the patient's airway in emergency lifesaving activities, an emergency lifesaving person who has received a predetermined class and practical training is permitted to perform tracheal intubation.

  When performing this tracheal intubation, it is described in Patent Document 1 and Patent Document 2 for the purpose of opening the patient's mouth and exposing and observing the larynx and securing the space for inserting the intubation tube. A laryngoscope is used. This laryngoscope is composed of a handle (handle) held by a doctor or the like and a blade inserted into the oral cavity of the patient. Then, the visual field leading to the glottis is secured by inserting the blade into the oral cavity, squeezing out the tongue with the blade, and lifting the epiglottis at the tip of the blade.

  As the shape of this laryngoscope blade, a straight type that linearly extends from the portion connected to the handle to the tip and a Macintosh type that curves from the portion connected to the handle to the tip are widely known. ing. These types of blades are available in different widths and lengths, and doctors select a blade that seems appropriate for the patient based on their experience and attach the blade to the handle. Are used.

  By the way, since tracheal intubation is performed for securing the airway, it is necessary to perform it quickly. In addition, newborns and infants have an anatomical feature that the oral cavity is significantly smaller than adults and the tongue is larger than the size of the oral cavity, which obstructs visual field when performing tracheal intubation. Cheap. Therefore, tracheal intubation for newborns is very difficult, but according to the neonatal resuscitation guidelines, the time allowed for one tracheal intubation is determined to be within 20 seconds. If tracheal intubation is not completed within 20 seconds, tracheal intubation must be stopped, ventilated with a bag mask, and wait until the newborn's heart rate and whole body color are improved. Therefore, it is necessary to complete tracheal intubation as quickly as possible.

  Tracheal intubation must be done quickly, but in addition to individual variations in tongue size, some patients have a disease with a large tongue and others with a small mouth. Therefore, once the laryngoscope blade was inserted into the oral cavity, the width of the blade was not appropriate for the patient, and the tongue would hang down from the edge of the blade, hindering insertion of the laryngoscope and observation of the pharynx There is.

  In addition, in the case of a doctor or paramedic who is still unfamiliar with tracheal intubation, an incorrect operation of the blade insertion position may cause the tongue to hang down from the edge of the blade, hindering insertion of the laryngoscope and observation of the pharynx Sometimes.

  In such a case, with the blade in the conventional laryngoscope, the width of the blade itself cannot be changed while the blade is inserted into the oral cavity, and the hanging tongue cannot be removed.

  Therefore, in order to change the width of the blade, it was necessary to remove the blade from the oral cavity, replace the blade attached to the laryngoscope with another blade, and insert the blade into the oral cavity again. As a result, in the conventional laryngoscope, undesirable results such as an extension of the work time required for tracheal intubation and an increase in the number of work operations have occurred. In particular, tracheal intubation for newborns requiring prompt tracheal intubation can be a major problem.

  The inventor of the present application has come up with the invention of Patent Document 3 as a result of various studies to solve this problem, and if the width of the blade of the laryngoscope can be adjusted, this problem can be solved. It came.

JP 2009-11424 A JP 2011-55941 A JP 2014-239881 A

  As a result of repeated experiments and examinations, the function was superior to that of Patent Document 3 of the previous application, and more specific blades were designed, drawn, and prototyped for production. In particular, Patent Document 3 changes the width of the blade by moving the auxiliary blade by a link structure. For this reason, delicate adjustment and operation of the width of the blade are difficult, and the auxiliary blade moves somewhat back and forth in the insertion direction. Therefore, further improvements are required in scenes where delicate work such as tracheal intubation is required.

  Further, paragraph number 0049 of Patent Document 3 describes that the width of the blade is adjusted in a paragraphwise manner. However, it is more preferable to adjust the blade to an arbitrary position in order to obtain an optimum width. After operating the operation unit to the optimum width of the blade, if you maintain the optimum blade width even if you release your hand from the operation unit, you can concentrate on the work of inserting the intubation tube, making it faster and easier It can be carried out.

  That is, an object of the present invention is to provide a laryngoscope and a laryngoscope blade that are optimal when changing the width of the blade in the oral cavity. It is another object of the present invention to provide a laryngoscope and a laryngoscope blade that can concentrate on insertion work of an intubation tube and can be performed more quickly and easily.

  In order to solve the above-mentioned problem, a laryngoscope according to one aspect of the present invention includes a variable width blade including a handle, a blade body, and an auxiliary blade capable of sliding in the width direction of the blade body, and sliding of the auxiliary blade. And a sliding adjustment unit that adjusts the amount.

  A laryngoscope blade according to another aspect of the present invention is a laryngoscope blade used by being inserted into an oral cavity, and includes a blade body and an auxiliary blade that can slide in the width direction of the blade body. It is characterized by comprising a variable width blade and a sliding adjustment part for adjusting the sliding amount of the auxiliary blade.

  Moreover, it is preferable that the said slide adjustment part consists of the rack gear of an auxiliary blade, and the rotary dial engaged with the said rack gear of a blade main body.

  The auxiliary blade is preferably removable from the blade body.

  It is preferable that a stopper for restricting the sliding distance of the auxiliary blade is provided, and the stopper is released from the restriction of the sliding distance by a predetermined operation force and the auxiliary blade is detached from the blade body.

  By providing an auxiliary blade that can slide in the width direction of the blade body and a sliding amount adjusting unit that adjusts the sliding amount of the auxiliary blade as in the aspect of the present invention, in a delicate operation such as tracheal intubation, This is optimal when changing the width of the blade.

  In addition, since the sliding adjustment unit includes a rack gear of the auxiliary blade and a rotary dial that engages with the rack gear of the blade body, the blade is adjusted to the optimum width by operating the operation unit, and then the hand is operated from the operation unit. Even if the blades are separated from each other, it is easy to maintain the optimum width of the blade, so that it is possible to concentrate on the insertion work of the intubation tube, and it can be performed more quickly and easily.

  Further, since the auxiliary blade can be detached from the blade body, it can be sterilized separately, and the sterilization effect can be further enhanced. Even if the auxiliary blade is damaged, it can be easily replaced.

  Moreover, since the stopper which regulates sliding distance is provided, sliding operation can be performed safely.

(A) is an imaging figure which shows the usage method of the laryngoscope of Embodiment 1 of this invention, (B) is an imaging figure of the angle different from (A). (A) is a figure of the stereo image which shows the laryngoscope of Embodiment 1, (B) is a figure of the stereo image of an angle different from (A). 3 is an exploded view of a stereoscopic image showing the configuration of the laryngoscope of Embodiment 1. FIG. (A) is a figure of the three-dimensional image which shows the state which removed the attachment tool of the auxiliary blade and the light guide tube in the laryngoscope of Embodiment 1, (B) is a three-dimensional image of an angle different from (A). FIG. (A) is the figure of the stereo image which shows the handle | steering-wheel of Embodiment 1, (B) is the figure of the stereo image which shows a braid | blade main body, (C) is the stereo image of the angle different from (B). FIG. (A) is a figure of the stereo image which shows the auxiliary | assistant blade of Embodiment 1, (B) is a figure of the stereo image of an angle different from (A). It is a front view which shows the structure of the laryngoscope of Embodiment 1. FIG. It is a left view which shows the laryngoscope of Embodiment 1. (A) is a top view which shows the laryngoscope of Embodiment 1, (B) is sectional drawing which shows the mesh | engagement of the worm gear of an auxiliary blade operation part, and the rack gear of an auxiliary blade. It is the figure which showed the groove | channel on the blade main body side in which the ball | bowl by the side of the auxiliary blade of Embodiment 1 fits. (A) is a figure of the stereo image which shows the laryngoscope of Embodiment 2, (B) is a figure of the stereo image of an angle different from (A). FIG. 6 is an exploded view of a stereoscopic image showing the configuration of the laryngoscope of Embodiment 2. (A) is a figure of the stereo image which shows the braid | blade main body of Embodiment 2, (B) is a figure of the stereo image of an angle different from (A). (A) is the figure of the stereo image which shows the auxiliary | assistant blade of Embodiment 2, (B) is a figure of the stereo image of an angle different from (A), (C) is the figure which shows the transmission shaft. It is a figure of an image. It is a figure of the stereo image which shows the operation rod of Embodiment 2. FIG.

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, the embodiment described below exemplifies a laryngoscope blade and a laryngoscope for embodying the technical idea of the present invention, and the present invention is specified to the laryngoscope blade and the laryngoscope. It is not intended that the invention be equally applicable to other embodiments of laryngoscope blades and laryngoscopes within the scope of the claims.

[Embodiment 1]
With reference to FIGS. 1-10, the laryngoscope 1 which concerns on Embodiment 1 is demonstrated. As shown in FIG. 1, the laryngoscope 1 has a visual field that reaches the glottis when the doctor 10 or a paramedic holds the handle 10 and inserts the blade 20 into the oral cavity when performing tracheal intubation using the laryngoscope 1. The tongue is crushed from. As shown in FIGS. 2 to 9, the laryngoscope 1 of this embodiment includes a handle 10 and a blade 20. 2, 4, 7, 8, and 9A are assembly drawings, FIG. 3 is an exploded view, and FIGS. 5 and 6 are component drawings.

  A blade 10 is connected to a handle 10 held by a doctor or an emergency medical technician. As shown in a part diagram of FIG. 5A, the handle 10 includes a cylindrical main body 11 and a connecting portion. 12. The main body 11 is provided with a connecting portion 12 on a circular lower surface 11b, and the handle upper surface 11a is a removable lid. And the handle | steering-wheel 10 can accommodate the dry battery, a light source lamp, etc. which are not illustrated in the inside of the main-body part 11 by removing the cover part of the handle | steering-wheel upper surface 11a.

  The connecting portion 12 to which the blade 20 is connected constitutes a recess into which a mount 33 of the blade 20 described later is fitted. Specifically, the connecting portion 12 includes two wall portions 13 and a connecting rod 14 provided between the two wall portions 13.

  In addition, the handle | steering-wheel 10 can be selectively used according to a patient's age and body shape by using the thing from which the thickness and length of the main-body part 11 differ.

  The blade 20 is a laryngoscope blade for use in the laryngoscope 1. Further, when the blade 20 is inserted into the oral cavity and the tongue is squeezed out, if the tongue hangs down from the edge of the blade 20, the blade 20 hangs down by widening the lateral width of the blade 20. In order to make it possible to exclude the portion, the blade 20 is composed of a variable width blade capable of changing the width of the blade 20. The arrow F in FIG. 2 and the like is the direction in which the blade 20 is inserted, and the arrow P is the direction in which the tongue is excluded.

  The blade 20 made up of this variable width blade is composed of a blade body 30, an auxiliary blade 50, and a dial 60.

  The blade main body 30 is made of a metal member, and is a planar tongue pressure portion 31 called a spatula or the like, a flange 32 extending vertically from the tongue pressure portion 31, and a mount connected to the connection portion 12 of the handle 10. 33.

  The tongue pressure portion 31 is a flat member extending from the lower portion of the mount 33 at a right angle to the handle 10. The length of the tongue pressure portion 31 is approximately 60 to 140 mm, and the width is approximately 8 to 15 mm. The tongue pressure part 31 is configured to lift the epiglottis at the tip of the contact surface 31a, while the patient's tongue is removed on the contact surface 31a side which is the P side. In addition, although the tongue pressure part 31 of this embodiment is a straight type extending linearly, a so-called Macintosh type in which the tongue pressure part 31 bends and extends in accordance with the curvature in the oral cavity may be used.

  As shown in FIGS. 5B and 5C, the flange 32 includes a side wall 32a that hangs vertically from the edge of the non-contact surface 31b of the tongue pressure portion 31, and a top plate 32b that is bent at a right angle from the side wall 32a. And is composed of. Then, when the tongue pressure unit 31 advances correctly in the oral cavity, the normal patient's tongue is naturally squeezed to the left side (arrow L side in FIG. 2A) with respect to the side wall 32a of the flange 32, and reaches the glottis. Will be secured.

  The mount 33 is provided with a slot 33 a that opens along the insertion direction F. The handle 10 and the blade 20 are connected by disposing the mount 33 between the two wall portions 13 of the connecting portion 12 and fitting the connecting rod 14 through the opening of the slot 33a. The laryngoscope 1 is configured such that the blade 20 is rotatable with respect to the handle 10 when the handle 10 and the blade 20 are connected. When performing tracheal intubation, the handle 10 and the blade 20 are connected to each other as shown in FIG. It is used in such a right angle state.

  As shown in FIGS. 2 and 4, a light guide tube 40 made of glass fiber is attached to the blade body 30 to guide the light from the light source in the handle 10 in the F direction of the side wall 32 a (the insertion direction of the blade 20). . As shown in FIG. 5C, the mount 33 is provided with a recess 34 into which the light guide tube 40 enters, and a long hole 35 through which the light guide tube 40 passes through the flange 32 (here, the through hole is referred to as a “hole”. The hole that is not written is referred to as a “hole”.) The light guide tube recess 34 opens to the arrow L side, the light guide tube recess 34 into which the light guide tube 40 is inserted is closed by the lid 41 shown in FIG. 3, and the lid 41 is screwed by the screw 42 shown in FIG. Has been. The end surface of the light guide tube 40 attached to the light guide tube recess 34 on the handle 10 side serves as an input surface of the light source, and the other end surface serves as a light output surface. The output surface side of the light guide tube 40 attached to the light guide tube recess 34 passes through the long hole 35 and goes out to the arrow R side of the side wall 32 a of the flange 32. With such a configuration, light from the light source lamp in the handle 10 can be guided to the tip side of the blade 20. The light guide tube 40 of this embodiment can be attached and detached with a screw 42.

  As shown in FIGS. 3, 6 and 7, a slide plate 51 is formed behind the auxiliary blade 50 (in the direction opposite to the arrow F). As shown in FIGS. 3 and 5, two grooves 36 into which two parallel edges 51a (see FIGS. 6A and 6B) of the slide plate 51 are fitted are formed behind the blade body 30 (arrows). It is formed in the direction opposite to F). As a result, the auxiliary blade 50 slides (slides) in the width direction of the tongue pressure portion 31 on the non-contact surface 31 b side of the tongue pressure portion 31 of the blade body 30. The lateral width of the blade 20 is the sum of the width of the tongue pressure portion 31 and the width of the auxiliary blade 50 exposed from the side end of the tongue pressure portion 31. Thereby, the blade 20 becomes a variable width blade.

  The length of the auxiliary blade 50 is slightly shorter than the blade body 30. In this case, the distal end side of the blade body 30 is directed toward the trachea side, so that the inside of the oral cavity is narrow, and therefore the work may be disturbed if the width of the blade 20 is changed. As shown in FIGS. 8 and 9A, the auxiliary blade 50 protrudes slightly from the blade body 30 in the direction of arrow R even at the initial position of the auxiliary blade 50 where the width of the blade 20 is the narrowest. This is for ensuring the sliding range of the auxiliary blade 50 and for ensuring the strength of the auxiliary blade 50. Therefore, as long as the movable range and strength of the auxiliary blade 50 can be sufficiently secured, the auxiliary blade 50 may be configured not to protrude from the blade body 30 at the initial position.

  The auxiliary blade 50 has a predetermined distance from the initial position in the direction of arrow R, that is, to the right of the side wall 32a of the flange 32 where the light guide tube 40 emits light (here, a maximum of 6.5 mm. (Excluding when the blade 50 is detached.) As shown in FIG. 8, the edge side of the auxiliary blade 50 in the direction of arrow R is bent in the direction opposite to the arrow P, that is, in the direction opposite to the tongue to prevent damage to the tongue and improve the strength of the auxiliary blade 50. I am letting. Although the sliding range of the auxiliary blade 50 is 6.5 mm, this dimension can be changed in design and is preferably about 4 to 7 mm.

  As shown in FIG. 6B, the auxiliary blade 50 includes a rack gear 52 on the arrow P direction side of the end portion on the handle 10 side. 7 and 8, the blade body 30 includes a dial 60 having a worm gear 61 that meshes with the rack gear 52 of the auxiliary blade 50. As shown in FIGS. 2, 7, 8, and 9 (B), the dial 60 is freely rotatable by a shaft 62 for the dial 60 and a screw 63 to two arms 37 extending from the mount 33 in the direction opposite to the arrow F. Is pivotally supported. As shown in FIG. 8, when the arrow F side of the dial 60 is rotated in the arrow P direction, the auxiliary blade 50 slides in the arrow R direction. Note that the dial 60 may be knurled to prevent slipping when the dial 60 is turned with a finger.

  As shown in FIGS. 7 and 10, the auxiliary blade 50 includes a ball spring portion 53 on a slide plate 51. The ball spring portion 53 includes a ball 531 and a spring 532, which are accommodated in a space formed by a cylinder 533 and a lid 534. A part of the ball 531 protrudes from the tube 533, and the ball 531 is biased in the protruding direction by a spring 532.

  As shown in FIGS. 5C, 9, and 10, a guide groove 38 into which the protruding ball 531 is inserted is formed in the blade body 30. As shown in FIG. 10, the guide groove 38 includes an allowable sliding portion 38a, a side wall portion 38b, and an attaching / detaching portion 38c that communicate with each other.

  When the blade body 30 is inserted into the oral cavity, the sliding of the auxiliary blade 50 by 6.5 mm is performed by the allowable sliding portion 38a.

  When the auxiliary blade 50 is to be removed from the blade body 30, the dial 60 is strongly rotated in the direction of increasing the width of the blade 20, whereby the spring 532 pressing the ball 531 is contracted and the ball 531 becomes the side wall portion 38b. Get on. When the dial 60 continues to rotate, the ball 531 passes through the attachment / detachment portion 38c from the side wall portion 38b, and the auxiliary blade 50 is eventually removed from the blade body 30.

  When the auxiliary blade 50 is inserted into the blade body 30, the rack gear 52 meshes with the worm gear 61 by inserting the slide plate 51 of the auxiliary blade 50 into the groove 36 of the blade body 30 while turning the dial 60. Even when the ball 531 rides on the side wall 38b, a slightly strong force is required.

  Thus, in this embodiment, the auxiliary blade 50 can be detached from the blade body 30. Since the auxiliary blade 50 can be detached from the blade body 50 in the variable width blade 20 as described above, when the blade 20 is sterilized, the auxiliary blade 50 and the blade body 30 can be sterilized. Very effective. Even when the auxiliary blade 50 is damaged, only the auxiliary blade 50 can be replaced.

  In addition, the present embodiment includes a stopper including a ball spring portion 53 in which the protruding amount of the ball is shortened by pressing, and a guide groove 38 including a permissible sliding portion 38a, a side wall portion 38b, and a detachable portion 38c. ing. With this stopper, the auxiliary blade 50 can be regulated so as not to slide by 6.5 mm or more with the normal rotational force of the dial 60, and the sliding operation can be performed safely. Further, if the rotational force of the dial 60 is made extremely strong, the auxiliary blade 50 can be detached from the blade body 30, so that the auxiliary blade 50 can be easily detached without using a tool such as a screwdriver or a hexagon wrench. it can.

  As described above, since the blade 20 is a variable width blade, the blade 20 is inserted into the oral cavity with the auxiliary blade 50 in the initial position (position where the width of the blade 20 is the shortest), and the tongue is removed. When the tongue is likely to hang down from the edge of the tongue pressure part 31 or when the tongue hangs down from the edge of the tongue pressure part 31, the auxiliary blade 50 is not pulled out of the oral cavity. Can be prevented from drooping in the state where the blade is moved from the side end of the blade body 30 in the direction of arrow R (expanded position).

  Accordingly, when the blade 20 having a variable width is used in the laryngoscope 1, the tongue hangs down from the edge of the blade 20 and obstructs the observation of the larynx. By extending the width of the blade 20 without re-inserting the blade, the hanging tongue can be quickly squeezed out.

  In particular, the laryngoscope 1 as in the present embodiment has a particularly high effect in the tracheal intubation for a newborn baby who requires a quick tracheal intubation for inexperienced doctors and paramedics. In addition, the number of blades for replacement can be reduced by using a variable width blade as compared with the conventional blade. Therefore, for example, when using a laryngoscope at an emergency site or the like, the number of blades to be carried can be reduced.

  Further, in the present embodiment, when the dial 60 is rotated, the auxiliary blade 50 slides in parallel with the width direction of the blade 20, so that when the width of the blade 20 is changed, the auxiliary blade 50 is moved back and forth in the insertion direction. It doesn't move. For this reason, this embodiment can improve workability in the tracheal intubation work that requires delicate work, and is a variable width blade 20 that is very easy to work.

  Further, the sliding of the auxiliary blade 50 is a movement by the worm gear 61 and the rack gear 52 that change the rotational movement in a direction perpendicular to the rotation axis, and therefore moderate friction is generated to conduct the movement in the perpendicular direction. Therefore, even if the dial 60 is operated to bring the blade 20 to the optimum width and the hand is released from the dial 60, the auxiliary blade 50 can be easily adjusted by the friction between the worm gear 61 and the rack gear 52. The position of is difficult to shift. For this reason, even if the hand is released from the dial 60, it is easy to maintain the optimum width of the blade 20, so that it is possible to concentrate on the insertion work of the intubation tube, and it can be performed more quickly and easily.

  Moreover, this embodiment can implement | achieve the braid | blade 20 of variable width with few components. In addition, since the number of parts is simple and the structure is simple, the sterilization effect during sterilization can be enhanced.

  The width of the auxiliary blade 50 of this embodiment is substantially uniform up to the tip, but a shape with a narrow tip is preferable so as not to hinder the insertion of the blade 20.

[Embodiment 2]
Next, a blade 120 composed of a variable width blade whose width is changed by sliding different from the first embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the structure similar to Embodiment 1, and detailed description is abbreviate | omitted. The handle 10 of Embodiment 1 and Embodiment 2 is the same. The blade 20 of the first embodiment has a configuration in which the auxiliary blade 50 moves horizontally in the width direction by the rotation operation of the dial 60, but the blade 120 of the second embodiment has a configuration in which an arc movement in the width direction occurs by a slide operation of the operation rod 160. There is a major difference and this is explained.

  The blade 120 includes a blade body 130, an auxiliary blade 150, an operation rod 160, and a transmission shaft 170.

  As shown in FIGS. 11 to 13, the blade body 130 has a mount 133 for attaching to the handle 10. A first cover 136 that accommodates part of the operating rod 160 is formed in the direction opposite to the arrow F of the mount 133, and a second cover 137 that accommodates the transmission shaft 170 is provided between the mount 133 and the first cover 136. It is formed in the direction of arrow R.

  As shown in FIGS. 14A and 14B, the tongue pressure portion 131 of the blade body 130 is tapered from the middle, and the cross section in the width direction is a gentle arc that warps in the direction of the arrow P. The auxiliary blade 150 includes a rack gear 152 on the arrow P direction side of the end portion on the handle 10 side. The teeth of the rack gear 152 are also arranged in a gentle arc that warps in the direction of arrow P in the same manner as the tongue pressure portion 131.

  As shown in FIG. 14C, the transmission shaft 170 has a cylindrical shape extending in the direction of the arrow F, the first pinion gear 171 at the end in the direction of the arrow F, and the end in the direction opposite to the arrow F. A second pinion gear 172 is provided. The first pinion gear 171 meshes with the rack gear 152 of the auxiliary blade 150. The transmission shaft 170 is rotatably held in the second cover using the mounting plate 180.

  As shown in FIGS. 12 and 15, the operation rod 160 has a rod shape extending in parallel with the handle 10, and the blade 20 side has a prismatic shape and the handle 10 side has a cylindrical shape. A rack gear 161 that meshes with the second pinion gear 172 of the transmission shaft 170 is provided at the end of the operation rod 160 on the blade 20 side. The operation rod 160 is slidably held in the first cover in the direction of arrow P and in the direction opposite to the arrow P. In order to facilitate this sliding operation, a notch 162 is provided on the arrow P side of the operating rod 160.

  With such a configuration, as shown in FIG. 12, when the operating rod 160 is slid in the direction opposite to the arrow P, the transmission shaft 170 rotates counterclockwise as seen in the arrow F direction, and the auxiliary blade 150 is the same. It rotates in the direction, that is, in the direction of arrow R. Since the rotation of the auxiliary blade 150 slides in contact with the surface of the tongue pressure portion 131 of the blade body 130, the auxiliary blade 150 slides in the width direction of the blade 120 (the width is an arc shape). . Since the auxiliary blade 150 of the second embodiment also does not move in the direction of the arrow F when sliding, the workability can be improved in the tracheal intubation work that requires delicate work as in the first embodiment. The blade 20 has a variable width that is very easy to work with.

DESCRIPTION OF SYMBOLS 1,101 ... Laryngoscope 10 ... Handle 20 ... Blade 30, 130 ... Blade body 31, 131 ... Tongue pressure part 36 ... Groove 38 ... Guide groove 38a ... Allowable sliding part 38b ... side wall part 38c ... detachable part 40, 140 ... light guide tube 50, 150 ... auxiliary blade 52, 152 ... rack gear 53 of auxiliary blade ... ball spring 531 ··· Ball 532 · · · Spring 60 · · · Dial 61 · · · Worm gear 62 · · · Shaft 63 · · · Screw 160 · · · Operating rod 161 · · · Rack gear 162 · · · Notch 170 ... Transmission shaft 171 ... First pinion gear 172 ... Second pinion gear 180 ... Transmission shaft mounting plate

Claims (8)

A handle,
A variable width blade comprising a blade body and an auxiliary blade capable of sliding in the width direction of the blade body;
A sliding adjustment section for adjusting the sliding amount of the auxiliary blade;
A laryngoscope comprising:   The laryngoscope according to claim 1, wherein the sliding adjustment unit includes a rack gear of an auxiliary blade and a rotary dial that engages with the rack gear of a blade body.   The laryngoscope according to claim 1, wherein the auxiliary blade is detachable from the blade body. A stopper for regulating the sliding distance of the auxiliary blade;
4. The laryngoscope according to claim 3, wherein the restriction of the sliding distance of the stopper is released by an operation force greater than or equal to a predetermined value, and the auxiliary blade is detached from the blade body. A blade for a laryngoscope used by being inserted into the oral cavity,
A variable width blade comprising a blade body and an auxiliary blade capable of sliding in the width direction of the blade body;
A sliding adjustment section for adjusting the sliding amount of the auxiliary blade;
A laryngoscope blade characterized by comprising:   6. The laryngoscope blade according to claim 5, wherein the sliding adjustment unit includes a rack gear of an auxiliary blade and a rotary dial that engages with the rack gear of a blade body.   The laryngoscope blade according to claim 5 or 6, wherein the auxiliary blade is detachable from the blade body. A stopper for regulating the sliding distance of the auxiliary blade;
8. The laryngoscope blade according to claim 7, wherein the stopper is released from restriction of a sliding distance by an operation force greater than or equal to a predetermined value, and the auxiliary blade is detached from the blade body.