JP2015142634A - laryngeal mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laryngeal mask in which an annular cuff is prevented from coming off from an insertion position when the annular cuff inserted to the insertion position is expanded.SOLUTION: A laryngeal mask comprises: an insertion tube to be inserted to a human body so as to communicate with a trachea; and an annular cuff 50 which is provided at the tip part of the insertion tube and can closely contact with a tissue surrounding an opening of the trachea by expanding in a state of being inserted to an insertion position from an oral cavity. The annular cuff 50 comprises a cuff base end part 50R and a cuff tip part 50F provided at the tip of the cuff 50. When the annular cuff 50 is expanded, the cuff base end part 50R becomes thicker than the cuff tip part 50F in a side view, and the cuff base end part 50R and the cuff tip part 50F are connected to each other so that the cuff base end part 50R protrudes forward from the cuff tip part 50F in the side view so as to form a step 50x.

Description

  The present invention relates to a laryngeal mask, which is a medical instrument for securing an airway during general anesthesia or lifesaving emergency.

  The laryngeal mask is a medical device for securing the airway while blocking communication between the human esophagus and the trachea. As disclosed in Patent Document 1, the laryngeal mask is provided with an insertion tube inserted into the human body so as to communicate with the trachea and a distal end portion of the insertion tube as a basic configuration, and is set in advance from the oral cavity. And an annular cuff that can be brought into close contact with the tissue around the opening of the trachea by being expanded in a state of being inserted into the insertion position. First, with reference to FIG. 9, the part of the human body into which the laryngeal mask is inserted will be briefly described.

  The nasal cavity J1 and the oral cavity J2 of the human body J communicate with the pharynx T, and the esophagus J5 and the trachea J6 branch from the pharynx T. There are a larynx J8 and a epiglottis J3 for preventing aspiration on the trachea J6, and a hyoid bone J7 in the vicinity of the epiglottis J3. The hyoid bone J7 has a U-shape that surrounds the pharynx T from the front side (abdominal side) and the left and right sides of the human body J. The hyoid bone J7 is connected to the tissue around the opening of the trachea J6 with a ligament. There is a tongue J9 in the oral cavity J2, and the back part (lingual root) of the tongue J9 is close to the epiglottis J3. A epiglottis valley J10 is formed between the back of the tongue J9 and the epiglottis J3. On the esophagus J5, there is a stenosis portion J4 narrowed by a sphincter for communicating or blocking the esophagus J5 and the pharynx T. The pharynx T is below the upper pharynx T1 in the range above the bifurcation of the nasal cavity J1 and the oral cavity J2, below the upper pharynx T1 and above the epiglottis J3, and below the range below the oropharynx T2. And pharynx T3.

  For such a human body part, the laryngeal mask is generally used as follows. With the annular cuff contracted, the insertion tube is inserted from the annular cuff side into the esophagus J5 through the oral cavity J2, and the distal end of the annular cuff passes through the branch between the esophagus J5 and the trachea J6 and reaches the constriction J4. Insert the annular cuff until The position of the annular cuff at this time is referred to as an “insertion position”. The annular cuff inserted at the insertion position is located in the pharynx T (more specifically, located from the hypopharynx T3 to the oropharynx T2). Here, when the annular cuff is inflated, the annular cuff closely contacts the tissue around the opening of the trachea J6, and the communication between the esophagus J5 and the trachea J6 is blocked by the annular cuff. Then, in this state, the airway is secured by sending air into the trachea J6 via an insertion tube or the like through the insertion tube or leading out exhalation from the lungs.

Japanese translation of PCT publication No. 2003-511108 (refer to FIGS. 1 to 3 in particular)

  Conventionally, an annular cuff of a laryngeal mask has a wedge shape with a thin tip when viewed from the side. Therefore, the following problems occur. That is, when the annular cuff inserted at the insertion position is expanded, the expanded annular cuff presses the human tissue, and the reaction force acts on the annular cuff. The reaction force acts on the wedge-shaped inclined surface of the annular cuff, and a component force is generated to push the annular cuff back toward the oral cavity J2. As a result, the annular cuff comes out of the insertion position when the annular cuff is expanded.

  Therefore, an object of the present invention is to provide a laryngeal mask in which the annular cuff is prevented from coming out of the insertion position when the annular cuff inserted at the insertion position is inflated.

  In order to solve the above problems, the present invention is a laryngeal mask for securing an airway while blocking communication between the human esophagus and trachea, and is inserted into the human body so as to communicate with the trachea. An insertion tube, and an annular cuff provided at the distal end of the insertion tube and inflated in a state of being inserted from the oral cavity into a preset insertion position so as to be in close contact with the tissue around the opening of the trachea. The annular cuff includes a cuff base end portion and a cuff tip end portion provided at the tip end thereof, and the cuff base end portion is in a side view more than the cuff tip end portion when the annular cuff is inflated. The cuff base end and the cuff tip are connected to each other so that the cuff base end protrudes forward from the cuff tip and forms a step in a side view. It is a dial mask.

  In the present invention, “front” refers to the front (abdominal side) of the human body, and more specifically refers to the side facing the opening of the trachea.

  According to the present invention, in the expanded annular cuff, the cuff base end protrudes forward from the cuff tip, so that the reaction force against the expansion acts on the cuff base end in a large proportion. The ratio that acts on Therefore, even if the surface on the front side of the cuff tip is an inclined surface, there is little reaction force acting on the cuff tip, so the component force to push the annular cuff back to the oral cavity is reduced. Thereby, the malfunction that an annular cuff comes off from an insertion position when an annular cuff is expanded is suppressed.

  In addition, as described with reference to FIG. 9, the epiglottis valley J10 is formed between the back of the tongue J9 and the epiglottis J3. When the annular cuff is inflated, the cuff base end portion is located between the deep part of the tongue J9 and the epiglottis J3 and tries to dive into the epiglottis valley J10. Here, if the step as in the present invention is not formed in the annular cuff, the cuff base end portion is difficult to sink into the epiglottis valley, whereas according to the present invention, the presence of the step causes the cuff base end portion. Projecting forward from the cuff tip, the dive into the epiglottis at the base of the cuff is promoted without being inhibited. When the annular cuff is inflated and the cuff base end is submerged in the epiglottis valley, the cuff base end is subjected to a reaction force that presses the cuff base end toward the back of the human body (back side). Acts from the back. At this time, since the back part of the tongue is on the oral cavity side with respect to the cuff base end part, the reaction force has a component component that makes the annular cuff face the anti-oral cavity side, that is, the insertion direction. As described above, when the annular cuff is inflated, the laryngeal mask becomes more difficult to come off.

  As described above, according to the present invention, a laryngeal mask is provided in which the annular cuff is prevented from coming out of the insertion position when the annular cuff inserted at the insertion position is inflated.

  In the present invention, in the state where the annular cuff is inflated, the cuff proximal end portion is inflated forward to be in close contact with the tissue on the front side of the pharynx, and the cuff tip portion is inflated laterally to It is preferable to have side surfaces that can be in close contact with the left and right tissues of the human body.

  According to this configuration, communication between the esophagus and the trachea is satisfactorily blocked by close contact with the tissue on the left and right sides of the human body on the side surface even if the cuff tip does not contact with the tissue on the front side of the human body. Further, the cuff base end portion is in close contact with the tissue on the front side of the human body, and the cuff distal end portion is in close contact with the left and right side tissues of the human body in different directions, so that the annular cuff is firmly and securely fixed in the pharynx.

  In addition, since the forward expansion of the cuff tip is suppressed, the ratio of the reaction force acting on the cuff tip is further reduced. Therefore, even if the surface on the front side of the cuff tip is an inclined surface, the component force to push the annular cuff back toward the oral cavity is further reduced. Thereby, when the annular cuff is expanded, the problem that the annular cuff comes out of the insertion position is further suppressed.

  In the present invention, it is preferable that the side surface of the tip end portion of the cuff is formed flat in the vertical direction and the front-rear direction in a state where the annular cuff is expanded.

  According to this configuration, compared to the case where the side surface of the cuff tip portion is formed in an arc shape in the vertical direction, for example, the contact area when the cuff tip portion comes into close contact with the left and right tissues of the human body increases. The annular cuff is more securely fixed in the pharynx, and the communication between the esophagus and the trachea is better blocked.

  In this invention, it is preferable that the supporting member which supports the said cuff front-end | tip part from the inner side of the said annular cuff so that the deformation | transformation of the said cuff front-end | tip part with respect to the external force from a side is suppressed is provided.

  According to this configuration, for example, when the cuff tip is inflated laterally, and the reaction force of expansion acts on the cuff tip from the left and right sides of the human body, deformation of the cuff tip is suppressed, so the cuff tip More closely adhere to the left and right side tissues.

  In the present invention, a hyoid bone contact portion that protrudes laterally from the support member and contacts the hyoid bone through the tissue of the pharynx in the pharynx with the annular cuff inserted at the insertion position is provided. It is preferable that

  As described with reference to FIG. 9, the hyoid bone J7 is connected to the tissue around the opening of the trachea J6 by a ligament, and therefore, there is little positional displacement with respect to the opening of the trachea J6. Therefore, if the insertion position of the annular cuff is set based on the position of the hyoid bone J7, the annular cuff can be brought into close contact with the tissue around the opening of the trachea J6 accurately. Therefore, according to this configuration, the hyoid bone contact portion protruding laterally from the support member contacts the hyoid bone through the pharyngeal tissue in the pharynx, so that the annular cuff is accurately stopped at the insertion position. Therefore, the annular cuff is closely attached to the tissue around the opening of the trachea without being displaced.

  In the present invention, when the annular cuff is inflated, a space capable of accommodating the epiglottis is formed on the front surface of the cuff base end, and the tongue is stored between the rear surface of the cuff base end and the insertion tube. It is preferred that a possible space is formed.

  According to this configuration, when the annular cuff is inflated, the cuff base end portion is reliably positioned between the deep part of the tongue and the epiglottis. Therefore, when the annular cuff is inflated, the cuff base end portion surely sinks into the epiglottis valley, and as a result, it becomes certain that the laryngeal mask is more difficult to come off as described above.

  As described above, the present invention provides a laryngeal mask that suppresses the annular cuff from coming out of the insertion position when the annular cuff inserted at the insertion position is inflated. Contribute to the development and improvement of medical device technology for airway management.

It is a disassembled perspective view of the laryngeal mask which concerns on embodiment of this invention (however, the cyclic | annular cuff is drawn in the expanded state. The following is the same). It is a longitudinal cross-sectional view of the laryngeal mask. FIG. 2 is a completed perspective view of the laryngeal mask having a different viewpoint from FIG. 1. It is a principal part top view of the said laryngeal mask. It is front sectional drawing which shows the positional relationship of a hyoid bone contact part and a hyoid bone in the state in which the cyclic | annular cuff of the said laryngeal mask was inserted in the insertion position from the human body front side. FIG. 6 is a plan sectional view showing the positional relationship shown in FIG. 5 from the upper side (head side) of the human body. It is side surface sectional drawing which shows the state which the cyclic | annular cuff of the said laryngeal mask was inserted in the insertion position, and expanded. It is a schematic diagram of an annular cuff, in which (a) illustrates a conventional problem, (b) illustrates the operation of the embodiment, and (c) illustrates another embodiment. It is explanatory drawing of the part of the human body into which a laryngeal mask is inserted.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the direction of the single laryngeal mask is as shown in FIG. 1. When inserted into the human body, the “upper” of the laryngeal mask is the “front” of the human body, “Front” is the “bottom” of the human body, and “left” of the laryngeal mask is the “left” of the human body. The “front end” of the laryngeal mask is referred to as the “tip”.

(1) Overall Configuration As shown in FIGS. 1 to 4, the laryngeal mask 1 according to this embodiment includes a main body member 10, a suction tube 20, a first connector 30, a second connector 40, an annular cuff 50, and a cuff. The whole is configured including the tube 60 and the like.

  The main body member 10 is manufactured by injection molding of, for example, medical soft polyvinyl chloride resin, the first connector 30 and the second connector 40 are manufactured by injection molding of, for example, polycarbonate resin, and the annular cuff 50 is, for example, medical It is manufactured by blow molding, dipping molding, injection molding, or the like of soft vinyl chloride resin or medical silicone rubber.

[1-1] Main Body Member The main body member 10 integrally includes an insertion tube 11, a support member 12, and a pair of left and right hyoid bone abutting portions 13. That is, the main body member 10 is formed by integrally molding the insertion tube 11, the support member 12, and the pair of left and right hyoid bone contact portions 13.

  The insertion tube 11 is inserted into the human body J so as to communicate with the trachea J6 (see FIG. 9). The insertion tube 11 is formed in a wide rectangular shape in which a cross-sectional shape (that is, a flow channel shape) in a direction orthogonal to the longitudinal direction is rounded. The insertion tube 11 is formed in an arc shape whose front end is curved forward in a side view, corresponding to the path from the oral cavity J2 of the human body J to the esophagus J5.

  The suction tube 20 is inserted into the insertion tube 11. The suction tube 20 is for sucking foreign matter in the esophagus J5 of the human body J, and has a circular channel shape. The channel area of the suction tube 20 is set to be significantly smaller than the channel area of the insertion tube 11.

  The first connector 30 is connected to the upper end of the insertion tube 11, and the second connector 40 is connected to the upper end of the first connector 30. The first connector 30 includes a cylindrical main body 31 and a pair of left and right plate-shaped protrusions 32. The first connector 30 is connected to the insertion tube 11 by fitting the cylindrical main body 31 into the insertion tube 11. In a state where the first connector 30 is connected to the insertion tube 11, the pair of plate-like projecting pieces 32 protrude left and right at the upper end portion of the insertion tube 11.

  The second connector 40 has a first opening 41 and a second opening 42. The first opening 41 is provided at the upper end of the second connector 40 and is connected to a ventilator (not shown). The second opening 42 protrudes obliquely rearward and upward from the rear side surface of the second connector 40 and is connected to a suction device (not shown). The upper end portion of the suction tube 20 is connected to the second opening 42 inside the second connector 40.

  The air supplied from the ventilator is introduced into the upper end portion of the insertion tube 11 via the first opening 41 and the two connectors 40 and 30, and from the distal end portion of the insertion tube 11 via the insertion tube 11. It is discharged outside. The distal end portion of the insertion tube 11 opens inside the annular cuff 50 while being surrounded by the annular cuff 50. On the other hand, exhaled air discharged from the lungs is taken into the insertion tube 11 from the distal end portion of the insertion tube 11 and led out of the body. The negative pressure generated by the suction device reaches the upper end portion of the suction tube 20 via the second opening 42 and extends from the distal end portion of the suction tube 20 to the outside via the suction tube 20.

  The support member 12 is continuously formed on the lower surface of the distal end portion of the insertion tube 11. The support member 12 is formed in a substantially rectangular flat plate shape slightly wider than the insertion tube 11 in a plan view (see FIG. 5), and is formed in an arc shape that is gently curved so as to be recessed upward in a front view. Therefore, the left and right side edge portions of the support member 12 are located slightly above the center portion of the support member 12 in the width direction. The support member 12 extends further to the front side than the distal end portion of the insertion tube 11.

  The hyoid bone contact portion 13 is formed on the left and right side surfaces of the distal end portion of the insertion tube 11 and is located on the rear side of the support member 12. The left hyoid bone contact portion 13 protrudes leftward from the left side surface of the insertion tube 11, and the right hyoid bone contact portion 13 protrudes rightward from the right side surface of the insertion tube 11.

  Although not shown in detail, each hyoid bone contact portion 13 is formed in a fan shape having a central angle of approximately 70 ° to 80 ° in a side view, the arc portion faces downward, and one radial portion is the front side (support member 12 Side). And the flat surface including the one radius part is made into the contact surface 13a with hyoid bone J7 (refer FIG.1 and FIG.5). Each hyoid bone contact portion 13 is disposed at a position (hereinafter referred to as “tube arc end position”) X where the forward arc of the insertion tube 11 ends, and protrudes leftward and rightward from the support member 12.

  In addition, the left and right side edge portions of the support member 12 protrude upward as the rear side (insertion tube 11 side), and are directly connected to the left and right hyoid bone contact portions 13 (see FIG. 5).

  Next, the configuration of the distal end portion of the insertion tube 11, particularly the configuration on the front side of the tube arc end position X will be described.

  As shown in FIGS. 4 and 5, the distal end portion of the insertion tube 11 has a lateral width from the position where the hyoid bone contact portion 13 is disposed (that is, the tube arc end position X) to the front side in plan view. The width gradually decreases, and when the width is narrowed to a preset width, the preset width is maintained, and a predetermined length is further extended to the front side. The portion 11x in front of the tube arc end position X is referred to as a “final portion”. The inner surface of the circular arc of the insertion tube 11 is connected to the ceiling wall 11a of the final portion 11x, and the left and right side surfaces of the insertion tube 11 are connected to the left and right side walls 11b of the final portion 11x (see FIGS. 2, 3, and 5). Yes. The final portion 11x of the insertion tube 11 is formed symmetrically in plan view.

  As shown in FIGS. 2 and 3, the distal end portion of the insertion tube 11 extends obliquely downward toward the front side from the tube arc end position X (that is, the position where the hyoid contact portion 13 is disposed) in a side view. When the ceiling wall 11a reaches the support member 12, it ends. That is, the ceiling wall 11a of the final portion 11x of the insertion tube 11 is formed in a slope shape that is inclined lower toward the front side.

  As shown in FIGS. 4 and 5, a plurality (four in the illustrated example) of openings 11c, 11d, 11e, and 11e are formed in the slope-shaped ceiling wall 11a. Among these, the 1st opening 11c is arrange | positioned in the highest part of the ceiling wall 11a, has the largest opening area, and is formed in the rectangular shape rounded vertically (namely, front-back direction). The second opening 11d is disposed at the lowest portion of the ceiling wall 11a, has the second largest opening area, and has an edge formed in an arch shape. The pair of third openings 11e are disposed on the left and right sides of the first opening 11c, have the smallest opening area, and are formed in a substantially trapezoidal shape.

  As shown in FIGS. 2 and 3, one elliptical fourth opening 11 f is formed in each of the left and right side walls 11 b of the final portion 11 x of the insertion tube 11.

  These (six in the illustrated example) first to fourth openings 11c, 11d, 11e, and 11f are air outlets for discharging the air supplied from the ventilator and flowing through the insertion tube 11 to the outside. Yes (and also a breath outlet from the lungs). In particular, the first opening 11c having the largest opening area is a main air discharge port.

  As shown in FIG. 2, the insertion tube 11 is formed so that the portion immediately behind the tube arc end position X is inclined upward from the tube arc end position X, and the portion immediately before the tube arc end position X is It is formed in a downward slope. And the 1st opening 11c which is a main air discharge port is arrange | positioned ahead of the said upward inclination.

  Corresponding to the configuration of the distal end portion of the insertion tube 11, the distal end portion of the suction tube 20 is configured as follows.

  As shown in FIGS. 1 and 2, the suction tube 20 is formed in an arc shape along the insertion tube 11 such that the distal end is curved forward in a side view. The suction tube 20 is inserted in the insertion tube 11 while being biased to the right.

  The suction tube 20 bends slightly upward from the portion where the forward arc ends (first bend portion 20a), and then extends forward by a preset length. As a result, the suction tube 20 passes through the tube arc end position X of the insertion tube 11, passes through the fourth opening 11f formed in the right side wall 11b of the final portion 11x of the insertion tube 11, and passes through the distal end of the insertion tube 11. Go outside from the department.

  The suction tube 20 that has been exposed to the outside is bent slightly downward (second bent portion 20b), then extends forward by a slight length, and then bent leftward (third bent portion 20c). As a result, the suction tube 20 exits immediately in front of the second opening 11d formed in the ceiling wall 11a of the final portion 11x of the insertion tube 11. Then, the suction tube 20 ends in front of the second opening 11d and at the center in the width direction of the support member 12 by a predetermined length (see FIG. 5).

  The distal end portion of the suction tube 20 reaches a leading portion 50a of an annular cuff 50 described below, passes through the cuff leading portion 50a, and faces the outer front side.

[1-2] Regarding the annular cuff The annular cuff 50 is provided at the distal end portion of the insertion tube 11 and expands in a state in which it is inserted from the oral cavity J2 (see FIG. 9) into a preset insertion position. This is in close contact with the tissue around the opening to block communication between the esophagus J5 and the trachea J6.

  The annular cuff 50 integrally includes a cuff base end portion 50R and a cuff tip end portion 50F provided at the tip thereof. The cuff tip portion 50F includes a cuff leading portion 50a and a pair of left and right cuff intermediate side portions 50b. The cuff base end portion 50R, the cuff leading portion 50a, and the cuff intermediate side portion 50b communicate with each other inside and are formed in an annular shape (that is, endless) as a whole. The material and thickness of the annular cuff 50 are set so that expansion or contraction is possible when gas is supplied to the inside or discharged from the inside.

  The cuff base end portion 50R extends linearly in the width direction (left-right direction) in plan view. The cuff intermediate side portion 50b extends substantially parallel to each other from the left and right side end portions of the cuff base end portion 50R to the front side. The cuff head portion 50a is formed in an arc shape with the center portion in the width direction projecting forward, and the left and right side end portions are respectively connected to the front end portion of the cuff intermediate side portion 50b.

  The cuff base end 50R has dimensions of vertical (front-rear direction) × horizontal (left-right direction) × height (vertical direction) so that the capacity during expansion becomes relatively large. The cuff base end portion 50R expands upward ("forward" in the claims, that is, the front of the human body, corresponding to the side facing the opening of the trachea J6) during expansion.

  The size of each part of the cuff intermediate side part 50b of the cuff tip part 50F is set so that the capacity during expansion is relatively small. The left cuff intermediate side portion 50b expands to the left during expansion, and the right cuff intermediate side portion 50b expands to the right during expansion.

  The cuff head portion 50a of the cuff tip portion 50F is also sized so that the capacity when expanded is relatively small. The cuff leading portion 50a expands radially outward in the arc shape when expanded.

  In a state where the annular cuff 50 is expanded, the cuff base end portion 50R has a thickness (height in the vertical direction) larger than that of the cuff tip end portion 50F, and the cuff base end portion 50R and the cuff tip end portion 50F are side surfaces. The step 50x is formed by projecting the cuff base end portion 50R above the cuff tip end portion 50F ("front" in the claims, that is, the front of the human body and corresponding to the side facing the opening of the trachea J6). Are connected to each other. Therefore, at the boundary between the cuff base end portion 50R and the cuff tip end portion 50F, the step 50x extends from the upper surface of the left and right side end portions of the cuff base end portion 50R to the upper surface of the rear end portion of the cuff intermediate side portion 50b. Due to the existence, the height in the vertical direction has plummeted.

  As will be described later, the cuff base end portion 50R expands in front of the human body (refers to the side facing the opening of the trachea L6 and corresponds to “front” in the claims) and closely contacts the tissue on the front side of the pharynx T. The cuff tip 50F (more specifically, the cuff middle side 50b) expands to the left and right of the human body and comes into close contact with the left and right tissues of the pharynx T.

  With the annular cuff 50 inflated, the side surface (cuff side surface) 50z of the cuff intermediate side portion 50b that is in close contact with the left and right tissues of the pharynx T is flat in the vertical direction and the front-rear direction so as to increase the contact area. It is formed in a shape.

  In the state in which the annular cuff 50 is expanded, the upper surface of the cuff intermediate side portion 50b is formed in parallel with the support member 12 in the front-rear direction. That is, the upper surface of the cuff intermediate side portion 50b is not formed in a wedge-shaped inclined surface.

  In the state in which the annular cuff 50 is expanded, a recess 50e that is slightly retracted rearward is formed on the front surface of the central portion in the width direction of the cuff base end portion 50R. The recess 50e provides a space that can accommodate the epiglottis J3 on the front surface of the cuff base end 50R (see FIG. 7).

  In a state where the annular cuff 50 is expanded, a space capable of accommodating the tongue J9 is formed between the rear surface of the cuff base end portion 50R and the insertion tube 11 (see FIGS. 2 and 7).

  A cuff tube mounting portion 50y for supplying an inflation gas to the annular cuff 50 projects from the rear surface of the central portion in the width direction of the cuff base end portion 50R. One end of the cuff tube 60 is connected to the attachment portion 50y, and the multiple ends of the cuff tube 60 are connected to a gas supply device (not shown).

  A cuff joint portion 50c is provided in a space surrounded by the cuff base end portion 50R, the pair of left and right cuff intermediate side portions 50b, and the cuff head portion 50a. The cuff joint 50c is formed across the cuff middle side 50b and the cuff head 50a. The cuff joint portion 50c is formed of a thin plate-like piece projecting inward of the annular cuff 50 from the lower portion of the cuff intermediate side portion 50b and the cuff head portion 50a. The cuff joint 50 c is placed on and joined to the upper surface of the support member 12. Thereby, the annular cuff 50 is attached to the main body member 10 via the cuff joint portion 50 c and is fixed to the distal end portion of the insertion tube 11.

  In this case, the left and right side edge portions of the support member 12 are in contact with the lower portions of the left and right cuff intermediate side portions 50 b of the annular cuff 50 from the inside of the annular cuff 50. Here, as described above, the support member 12 is formed in an arc shape that is gently curved so as to be recessed upward in a front view, and the left and right side edge portions of the support member 12 are the central portions in the width direction of the support member 12. It is located slightly above. That is, the support member 12 has a reaction force from the left and right sides of the human body that acts on the cuff middle side portion 50b when the cuff middle side portion 50b of the cuff tip 50F expands to the left and right of the human body (from the left and right directions). The cuff intermediate side portion 50b is supported from the inside of the annular cuff 50 against the compression force). In other words, the support member 12 has the cuff tip 50F (the cuff middle side 50b) an annular cuff so as to suppress deformation of the cuff tip 50F (more specifically, the cuff middle side 50b) due to an external force from the side. It supports from the inside of 50.

  In addition to the above, the annular cuff 50 is provided with a suction tube attachment portion 50d. The suction tube attachment portion 50d is formed in the cuff joint portion 50c so as to extend in the front-rear direction continuously to the through-hole formed in the center portion in the width direction of the cuff head portion 50a and to extend in the front-rear direction. Tube member. The distal end portion of the suction tube 20 that has reached the cuff head portion 50a passes through these tube members and through holes, and faces the front outside from the cuff head portion 50a, that is, from the tip portion of the laryngeal mask 1. .

(2) Usage method The usage method of the laryngeal mask 1 which concerns on this embodiment is as follows in general.

  [A] Gas is discharged from the inside of the annular cuff 50, and the annular cuff 50 is contracted.

  [B] The insertion tube 11 is inserted from the annular cuff 50 side through the patient's oral cavity J2 toward the esophagus J5.

  [C] When the insertion of the insertion tube 11 proceeds, the pair of left and right hyoid bone abutting portions 13 of the laryngeal mask 1 protrude to the left and right of the human body from the support member 12 as shown in FIGS. Therefore, the hyoid bone contact part 13 contacts the hyoid bone J7 from the oral cavity J2 side through the tissue of the pharynx T in the pharynx T. Therefore, further insertion of the insertion tube 11 is restricted. The medical worker stops the insertion of the insertion tube 11 when the hyoid bone contact portion 13 feels that the hyoid bone contact portion 13 is in contact with the hyoid bone J7. At this time, the cuff leading portion 50a reaches the constriction J4 past the branch portion between the esophagus J5 and the trachea J6. That is, the annular cuff 50 is inserted at the insertion position. The annular cuff 50 inserted in the insertion position is located in the pharynx T. Thereby, the annular cuff 50 can be accurately stopped and positioned at the insertion position based on the position of the hyoid bone J7.

  [D] Using a gas supply device, gas is supplied to the inside of the annular cuff 50 through the cuff tube 60 to expand the annular cuff 50. At this time, the cuff base end portion 50R expands in front of the human body and comes into close contact with the tissue on the front side of the pharynx T, and the left and right cuff intermediate side portions 50b of the cuff distal end portion 50F expand to the left and right of the human body. The tissue on the left and right sides of the pharynx T is in close contact with the cuff side surface 50z. As a result, the annular cuff 50 is in close contact with the tissue around the opening of the trachea J6, and the communication between the esophagus J5 and the trachea J6 is blocked.

  [E] The ventilator is operated to send air into the trachea J6 through the insertion tube 11. The air supplied from the ventilator and flowing through the insertion tube 11 is discharged from the air discharge ports 11c, 11d, 11e, and 11f formed in the final portion 11x of the insertion tube 11 and sent to the trachea J6. In addition, exhaled air discharged from the lungs is taken into the insertion tube 11 from the air discharge ports (exhalation outlet ports) 11c, 11d, 11e, and 11f of the insertion tube 11 and led out of the body. This ensures an airway to the lungs.

  [F] Thereafter, the aspirator is operated as appropriate, and the foreign matter in the esophagus J5 is sucked through the suction tube 20.

  [G] If necessary, a tracheal tube (not shown) is inserted into the insertion tube 11 to perform tracheal intubation. That is, tracheal intubation is performed through the laryngeal mask 1. At this time, the distal end portion of the tracheal tube exits the insertion tube 11 from the main air discharge port 11c having the largest opening area and is inserted into the trachea J6.

  FIG. 7 shows a state in which the annular cuff 50 of the laryngeal mask 1 is inserted into the insertion position and inflated, in a side view of the human body.

  As shown in the figure, with the annular cuff 50 inserted into the insertion position, the cuff base end 50R is located between the back of the tongue J9 and the epiglottis J3 and expands to sink into the epiglottis valley J10. It is out.

  The epiglottis J3 is received by being fitted into a recess 50e (a space in which the epiglottis J3 can be accommodated) 50e formed on the front surface of the central portion in the width direction of the cuff base end 50R.

  Since the cuff base end portion 50R expands forward of the human body and presses the tissue on the front side of the human body toward the front side of the human body, a gap is generated between the cuff intermediate side portion 50b of the cuff distal end portion 50F and the tissue on the front side of the human body.

  The main air discharge port 11c is disposed at the tip of the upward slope of the portion immediately behind the tube arc end position X of the insertion tube 11, and the opening of the trachea J6 is located further ahead.

(3) Operation of Embodiment As described above, in this embodiment, in the laryngeal mask 1 which is a medical instrument for securing the airway while blocking the communication between the esophagus J5 and the trachea J6 of the human body J, The dial mask 1 is provided at the distal end of the insertion tube 11 inserted into the human body J so as to communicate with the trachea J6, and is inflated in a state of being inserted from the oral cavity J2 into the insertion position shown in FIG. By doing so, it has an annular cuff 50 that can be in close contact with the tissue around the opening of the trachea J6.

  [3-1] Further, the cuff base end portion 50R on the oral cavity J2 side and the cuff leading end portion 50a and the cuff intermediate side portion 50b are provided in the state where the annular cuff 50 is inserted at the insertion position. And cuff tip 50F on the anti-oral cavity J2 side. In a state where the annular cuff 50 is expanded, the cuff base end portion 50R is thicker in side view than the cuff tip end portion 50F, and the cuff base end portion 50R and the cuff tip end portion 50F are cuff base in side view. The end portions 50R are connected to each other so as to protrude above the cuff tip portion 50F (in front of the human body), that is, to the side facing the opening of the trachea J6 to form a step 50x. In other words, a step 50x is formed between the cuff base end portion 50R and the cuff tip end portion 50F (more specifically, the cuff intermediate side portion 50b) on the front side of the human body in a side view of the human body.

  As illustrated in FIG. 8A, in the conventional laryngeal mask, the annular cuff 50 has a wedge shape with a thin tip (on the oral cavity J2 side) in a side view of the human body. Therefore, when the annular cuff 50 inserted at the insertion position is inflated, the reaction force F acts on the annular cuff 50 from the front side of the human body, but the reaction force F acting on the wedge-shaped inclined surface causes the annular cuff 50 to act on the human body. It has the component component F1 which pushes back, and the component component F2 which tries to push back to the oral cavity J2 side. As a result, when the annular cuff 50 is inflated due to the presence of the component component F2 to be pushed back toward the mouth J2, the annular cuff 50 comes out of the insertion position.

  On the other hand, as illustrated in FIG. 8B, in the laryngeal mask 1 according to the present embodiment, the annular cuff 50 is inserted into the insertion position, and the cuff base end portion 50R on the oral cavity J2 side is The cuff base end portion 50R is provided with a cuff tip portion 50F on the side opposite to the oral cavity J2 from the cuff base end portion 50R. When the annular cuff 50 is inflated, the cuff base end 50R is thicker than the cuff tip 50F in a side view of the human body, and the cuff base end 50R and the cuff tip 50F (more specifically, the cuff intermediate side) A step 50x is formed on the front side of the human body in a side view of the human body 50b). That is, due to the presence of the step 50x, the cuff base end 50R protrudes forward from the cuff tip 50F, and the front surface of the cuff base end 50R and the front surface of the cuff tip 50F are discontinuous with each other. Become. Therefore, an inclined surface continuously connecting the rear portion and the front portion of the annular cuff 50 as shown in FIG. 8A is not formed, and the reaction force F from the front side of the human body that acts when the annular cuff 50 expands. Mainly acts on the cuff base end portion 50R having a large thickness. That is, the reaction force F against the expansion has a large ratio of acting on the cuff base end portion 50R, and the ratio of acting on the cuff tip end portion 50F is small. As a result, since the reaction force acting on the cuff tip 50F is small, the generation of a component component that pushes the annular cuff 50 back toward the oral cavity J2 is suppressed, and the annular cuff 50 is expanded when the annular cuff 50 is expanded. Is prevented from coming out of the insertion position.

  In addition, a epiglottis valley J10 is formed between the back of the tongue J9 and the epiglottis J3. When the annular cuff 50 is inflated, the cuff base end portion 50R is located between the deep part of the tongue J9 and the epiglottis J3 and tries to sink into the epiglottis valley J10. Here, if the step is not formed as shown in FIG. 8A, the wedge-shaped inclined surface continuously connecting the rear portion and the front portion of the annular cuff 50 becomes an obstacle, and the cuff base end portion 50R is Although it is difficult to sink into the epiglottis valley J10, when the step 50x is formed as shown in FIG. 8B, the presence of the step 50x causes the cuff base end 50R to protrude forward from the cuff tip 50F. Therefore, the penetration of the cuff base end 50R into the epiglottis valley J10 is promoted without being inhibited. When the annular cuff 50 expands and the cuff base end portion 50R enters the epiglottis valley J10, the cuff base end portion 50R presses the cuff base end portion 50R toward the back (back side) of the human body. The reaction force acts from the back of the tongue J9. At that time, since the back part of the tongue J9 is on the oral cavity J2 side with respect to the cuff base end part 50R, the reaction force has a component component that makes the annular cuff 50 face the anti-oral cavity J2 side, that is, the insertion direction. As described above, when the annular cuff 50 is expanded, the laryngeal mask 1 becomes more difficult to come off.

  As described above, according to the present embodiment, the laryngeal mask 1 is provided in which the annular cuff 50 is prevented from coming out of the insertion position when the annular cuff 50 inserted at the insertion position is inflated.

  [3-2] In this embodiment, with the annular cuff 50 inflated, the cuff base end portion 50R is inflated forward of the human body and can be brought into close contact with the tissue on the front side of the pharynx T, and the cuff distal end portion 50F ( More specifically, the pair of cuff intermediate side portions 50b) have side surfaces (cuff side surfaces) 50z that expand to the left and right of the human body and can be brought into close contact with the left and right tissues of the pharynx T.

  According to this configuration, the cuff proximal end portion 50R having a relatively large thickness is in close contact with the tissue on the front side of the pharynx T, whereas the cuff distal end portion 50F having a relatively small thickness is provided on the left side and the right side of the human body of the pharynx T. Close contact with the organization. Therefore, even if the cuff tip 50F is not in close contact with the tissue on the front side of the human body, the communication between the esophagus J5 and the trachea J6 is well blocked by close contact with the left and right tissues of the human body at the cuff side surface 50z. Further, since the cuff base end portion 50R and the cuff tip end portion 50F are in close contact with the human tissue in two different directions, the annular cuff 50 is firmly and securely fixed in the pharynx T.

  In addition, since the expansion of the cuff tip portion 50F (more specifically, the cuff intermediate side portion 50b) toward the front of the human body is suppressed, the ratio of the reaction force of expansion from the front side of the human body acting on the cuff intermediate side portion 50b is further increased. Even less. Moreover, in the present embodiment, the front surface of the cuff intermediate side portion 50b is formed in parallel with the support member 12 in the front-rear direction, and is not formed on the wedge-shaped inclined surface. As a result, when the annular cuff 50 is inflated, a component component that tries to push the annular cuff 50 back toward the oral cavity J2 is hardly generated, and the problem that the annular cuff 50 comes out of the insertion position is greatly suppressed. The

  [3-3] In the present embodiment, the side surface (cuff side surface) 50z of the cuff tip portion 50F (more specifically, the cuff intermediate side portion 50b) that is in close contact with the left and right tissues of the human body in a state where the annular cuff 50 is inflated. Is formed flat in the vertical direction and the front-rear direction.

  According to this configuration, compared to a case where the side surface of the cuff tip 50F is formed in an arc shape in the vertical direction, for example, the contact area when the cuff tip 50F comes into close contact with the left and right tissues of the human body is increased. Therefore, the annular cuff 50 is more firmly and securely fixed in the pharynx T, and the communication between the esophagus J5 and the trachea J6 is further well blocked.

  [3-4] In the present embodiment, the support member 12 that supports the cuff tip 50F (more specifically, the cuff intermediate side 50b) from the inside of the annular cuff 50 is provided. More specifically, the support member 12 supports the cuff tip 50F against reaction forces from the left and right sides of the human body that act on the cuff tip 50F when the cuff tip 50F expands to the left and right of the human body. To do. In other words, the support member 12 that supports the cuff tip 50F from the inside of the annular cuff 50 is provided so as to suppress deformation of the cuff tip 50F due to an external force from the side.

  According to this configuration, for example, when the cuff tip 50F expands to the left and right of the human body, and the expansion reaction force acts on the cuff tip 50F from the left and right sides of the human body, the cuff tip 50F is deformed. It can be suppressed. For this reason, the cuff tip 50F is more securely adhered to the left and right tissues of the human body.

  [3-5] In the present embodiment, the hyoid bone protrudes from the support member 12 to the left and right of the human body and the annular cuff 50 is inserted at the insertion position in the pharynx T via the tissue of the pharynx T. A hyoid bone contact portion 13 that contacts J7 is provided.

  Since the hyoid bone J7 is connected to the tissue around the opening of the trachea J6 by a ligament, the positional displacement of the hyoid bone J7 with respect to the opening of the trachea J6 is small. Therefore, if the insertion position of the annular cuff 50 is set based on the position of the hyoid bone J7, the annular cuff 50 can be accurately brought into close contact with the tissue around the opening of the trachea J6. Therefore, according to this configuration, the hyoid bone contact portion 13 that protrudes to the left and right of the human body relative to the support member 12 contacts the hyoid bone J7 via the tissue of the pharynx T in the pharynx T. The cuff 50 is accurately stopped and positioned at the insertion position. Therefore, the annular cuff 50 is closely attached to the tissue around the opening of the trachea J6 without being displaced.

  [3-6] In the present embodiment, the recessed portion 50e is formed on the front surface of the cuff base end portion 50R with the annular cuff 50 inflated, thereby providing a space that can accommodate the epiglottis J3. Further, a space capable of accommodating the tongue J9 is formed between the rear surface of the cuff base end portion 50R and the insertion tube 11 in a state where the annular cuff 50 is expanded (see FIGS. 2 and 7). Therefore, the cuff base end portion 50R is reliably positioned between the deep part of the tongue J9 and the epiglottis J3, and is submerged.

  According to this configuration, when the annular cuff 50 is inflated, the cuff base end portion 50R is reliably positioned between the back portion of the tongue J9 and the epiglottis J3. Therefore, when the annular cuff 50 is inflated, the cuff base end portion 50R surely sinks into the epiglottis valley J10, and as a result, the laryngeal mask 1 is more difficult to be removed.

[3-7]
In addition to the above, the present embodiment has the following effects regarding the configuration of the distal end portion of the insertion tube 11.

  The tube arc end position X of the distal end portion of the insertion tube 11 is moved upward (front side of the human body), and a portion immediately behind the tube arc end position X is formed as an upward slope. Since the discharge port 11c is positioned and the opening of the trachea J6 is positioned further ahead, the air supplied from the ventilator is the main air discharge port as shown by the arrow Y in FIG. It is effectively fed into the trachea J6 through 11c. When performing tracheal intubation through the laryngeal mask 1, the distal end of the tracheal tube that has been inserted through the insertion tube 11 is successfully inserted into the trachea J6 through the main air discharge port 11c, and the laryngeal mask. Intubation through 1 is facilitated.

  Similarly, the tube arc end position X of the distal end portion of the insertion tube 11 is moved upward (front side of the human body), and the hyoid bone contact portion 13 disposed at the tube arc end position X is moved upward (front side of the human body). Therefore, as shown in FIG. 6, the hyoid bone abutting portion 13 is easy to abut on the hyoid bone J7 having a U-shape surrounding the pharynx T from the front side and the left and right sides of the human body J, and the annular cuff is surely secured. 50 can be positioned by stopping at hyoid bone J7.

  Since the distal end portion of the insertion tube 11 does not have a full opening, a slope-like ceiling wall 11a is provided in the final portion 11x, and a plurality of small air discharge ports 11c, 11d, and 11e are formed in a part of the ceiling wall 11a. During insertion of the insertion tube 11, the tip of the epiglottis J <b> 3 is suppressed from being caught or dropped at the air discharge port. Therefore, obstruction of the insertion tube 11 or the airway by the epiglottis J3 is suppressed. On the other hand, when the distal end portion of the insertion tube 11 is fully open, the distal end of the epiglottis J3 is caught or dropped during the insertion of the insertion tube 11, and the insertion tube 11 or the airway is blocked by the epiglottis J3. The problem arises. In addition, the fact that the main air discharge port 11c is long in the longitudinal direction (front-rear direction) is one of the factors that prevent the main air discharge port 11c from being blocked by the epiglottis J3.

  The final portion 11x of the insertion tube 11 has air discharge ports 11f formed not only on the ceiling wall 11a but also on the left and right side walls 11b, so the airway resistance of the insertion tube 11 is reduced. Therefore, it is possible to send air to the trachea J6 or the lungs with a small pressure (energy).

[3-8]
In the present embodiment, the configuration of the annular cuff 50 has the following action.

  As shown in FIG. 7, with the annular cuff 50 inserted into the insertion position and inflated, the epiglottis J3 is fitted into and accommodated in a recess (accommodation space for the epiglottis J3) 50e of the cuff base end 50R. Therefore, this also suppresses the epiglottis J3 from obstructing the airway.

  The leading end 50a of the annular cuff 50, which has been pointed conventionally, is rounded and widened to the left and right. Furthermore, the left and right side edge portions of the widened cuff head portion 50a are bent upward to bend, that is, an arc shape that gently curves so as to be recessed upward in a front view. On the other hand, the entrance of the trachea J6 of the human body J is narrow, and the entrance of the esophagus J5 has a long shape on the left and right. Therefore, the annular cuff 50 is easy to enter toward the esophagus J5, and accidentally entering the trachea J6 is effectively prevented.

  As described above, conventionally, the annular cuff has a wedge-shaped shape in a side view, and also has a sharp pointed end in a plan view. As a result, a component component that tries to push the annular cuff back toward the oral cavity J2 is generated not only by the reaction force of the expansion from the front side of the human body but also by the reaction force of the expansion from the side of the human body (left-right direction). On the other hand, in this embodiment, as shown in FIG. 4, the front portion 50 a of the annular cuff 50 is widened to the left and right, and the annular cuff 50 is formed in a substantially rectangular shape in plan view, thereby allowing the It is possible to suppress the generation of a component component in the pulling direction not only against the reaction force but also against the reaction force from the side of the human body.

  At the time of insertion, since the annular cuff 50 is contracted, the epiglottis J3 is restrained from being caught by the annular cuff 50.

[3-9]
In the present embodiment, the configuration of the first connector 30 has the following action.

  As shown in FIG. 3, in a state where the first connector 30 is connected to the insertion tube 11, the pair of left and right plate-like projecting pieces 32 protrude left and right at the upper end portion of the insertion tube 11. The plate-like protrusion 32 makes it easy to insert the laryngeal mask 1 while lifting the patient's lower jaw. That is, when the laryngeal mask 1 is inserted from the patient's oral cavity J2, it is easy to insert the laryngeal mask 1 by lifting the patient's lower jaw and expanding the esophagus J5 and trachea J6 from the pharynx T. By having this plate-like projecting piece 32, it is easy to put the thumb of both hands on this plate-like projecting piece 32 and push the plate-like projecting piece 32 while lifting the lower jaw with the other four fingers. The dial mask 1 can be inserted satisfactorily.

(4) Usage example When a conventional laryngeal mask with a wedge-shaped annular cuff is used on a patient, the front surface (upper surface) of the annular cuff continuously connects the proximal end and the distal end of the annular cuff. Since it is an inclined surface, a force in a direction to escape from the insertion position was applied to the expanded annular cuff.

  On the other hand, when the laryngeal mask according to the present invention is used for a patient, there is a step between the proximal end portion and the distal end portion of the annular cuff, and the height between the proximal end portion and the distal end portion is large. As a result, a reaction force acts only on the base end portion having a large thickness, so that a force in a direction to escape from the insertion position does not act on the expanded annular cuff. Instead, since the cuff base end part dives into the epiglottis valley between the deep part of the tongue and the epiglottis, a force toward the non-oral side, that is, a force in the insertion direction acts on the expanded annular cuff.

  X-ray imaging of the state at that time from the tail side of the human body confirmed that the cuff middle side of the cuff tip was inflated to the left and right of the human body and was in close contact with the left and right tissues of the pharynx It was done. Further, since the left and right side edges of the support member support the cuff intermediate side from the inside of the annular cuff, the cuff intermediate side retreats to the inside of the annular cuff when the cuff intermediate side expands. It was also confirmed that the cuff middle side was in close contact with the left and right tissues of the human body.

  Furthermore, the state when the laryngeal mask according to the present invention was used for another patient was X-ray imaged from the side of the human body. Since the epiglottis is housed in the recess at the base end of the cuff, the air outlet formed in the final part of the insertion tube and the opening of the trachea are not blocked by the epiglottis, that is, the epiglottis secures the airway It was confirmed that it was not an obstacle.

  Moreover, the state at that time was imaged by X-ray from the human abdomen. It was confirmed that the hyoid bone contact portion protrudes leftward and rightward of the human body from the support member and is in contact with the hyoid bone from the oral cavity side through the pharyngeal tissue in the pharynx. It was also confirmed that the cuff middle side portion at the tip of the cuff expanded to the left and right of the human body and was in close contact with the left and right tissues of the pharynx.

(5) Other Embodiments In the above embodiment, as shown in FIG. 8B, the upper surface of the cuff intermediate side portion 50b is parallel to the support member 12 in the front-rear direction in the state where the annular cuff 50 is expanded. The cuff base end portion 50R is thicker than the cuff tip end portion 50F in a side view of the human body, and the cuff base end portion 50R and the cuff tip end are formed instead of the wedge-shaped inclined surface. As long as the step 50x is formed on the front side of the human body as viewed from the side of the human body as viewed from the side of the body 50F, the upper surface of the cuff middle side portion 50b may be a wedge-shaped inclined surface as shown in FIG. I do not care. Also in such an embodiment, due to the presence of the step 50x, the reaction force F from the front side of the human body that acts when the annular cuff 50 expands mainly acts on the cuff base end portion 50R having a large thickness. Generation of a component component that attempts to push the cuff 50 back toward the oral cavity J <b> 2 is suppressed, and a problem that the annular cuff 50 comes out of the insertion position when the annular cuff 50 is expanded is suppressed.

  Further, since the cuff tip 50F does not expand in front of the human body, even if the cuff tip 50F has a wedge-shaped inclined surface, an expansion reaction force acts on the wedge-shaped inclined surface from the front side of the human body. It is suppressed. As a result, the generation of a component component that attempts to push the annular cuff 50 back toward the oral cavity J2 is suppressed, and the problem that the problem that the annular cuff 50 comes out of the insertion position is significantly suppressed is also maintained.

  In the embodiment, the insertion tube 11, the support member 12, and the pair of left and right hyoid bone abutting portions 13 are integrally molded. However, the present invention is not limited thereto, and may be separately molded and joined later. .

  The laryngeal mask 1 according to the embodiment may include a cooling device for cooling the patient's pharynx T.

1 laryngeal mask 11 insertion tube 11c first opening (main air outlet)
12 support member 13 hyoid contact part 50 annular cuff 50a cuff leading part 50b cuff middle side part 50F cuff tip part 50R cuff base end part 50x step 50z cuff side face F reaction force F2 component component to oral cavity J human body J2 oral cavity J3 epiglottis J5 esophagus J6 trachea J7 hyoid bone J9 tongue J10 epiglottis T pharynx

Claims (6)

A laryngeal mask for securing the airway while blocking communication between the human esophagus and trachea,
An insertion tube inserted into the human body so as to communicate with the trachea;
An annular cuff that is provided at the distal end of the insertion tube and that can be brought into close contact with the tissue around the opening of the trachea by expanding in a state of being inserted from the oral cavity into a preset insertion position;
The annular cuff includes a cuff base end portion and a cuff tip portion provided at the tip thereof,
With the annular cuff inflated, the cuff base end is thicker in side view than the cuff tip, and the cuff base end and the cuff tip are cuffed in side view. A laryngeal mask that is connected to each other so as to protrude forward from the cuff tip and form a step.   With the annular cuff inflated, the cuff base end portion is inflated forward to be able to come into close contact with the tissue on the front side of the pharynx, and the cuff tip portion is inflated laterally to the left and right sides of the human body of the pharynx. The laryngeal mask according to claim 1, wherein the laryngeal mask has a side face capable of being in close contact with a tissue.   3. The laryngeal mask according to claim 2, wherein a side surface of the tip end portion of the cuff is formed flat in the vertical direction and the front-rear direction in a state where the annular cuff is expanded.   The support member which supports the said cuff front-end | tip part from the inner side of the said annular cuff so that the deformation | transformation of the said cuff front-end | tip with respect to the external force from a side is suppressed is provided. Laryngeal mask.   A hyoid bone contact portion that protrudes laterally from the support member and contacts the hyoid bone through the tissue of the pharynx in the pharynx with the annular cuff inserted at the insertion position is provided. Item 5. A laryngeal mask according to item 4.   With the annular cuff inflated, a space capable of accommodating the epiglottis is formed on the front surface of the cuff base end, and a space capable of accommodating the tongue is formed between the rear surface of the cuff base end and the insertion tube. The laryngeal mask according to any one of claims 1 to 5, wherein:

Images