JP2007216005A - Nasotracheal endotracheal tube connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nasotracheal endotracheal tube connector, remarkably improving operability in dental/oral surgery, and not ulcerating in the nostril of a patient. <P>SOLUTION: This nasotracheal endotracheal tube connector includes: a trachea insert side conducting part 16 having an opening part 12 on the trachea insert side, which can be connected to a tube inserted in a patient's trachea; a gas supply source side conducting part 18 having an opening part on the gas supply source side, which can be connected to a medical treatment gas supply source; and a conducting pipe 20 constituting an acute-angle bent part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a nasal endotracheal tube connector used for anesthesia treatment such as during oral surgery. More specifically, the present invention relates to a nasal endotracheal tube connector having an opening connected to an endotracheal tube and an opening connected to a gas supply device such as a ventilator, and further having an insertion port into which a suction catheter can be inserted.

Various types of respirators for supplying breathing gas to a patient are known, such as a full face mask, a mask covering the nose and mouth, and a nasal mask.
In general, breathing masks provide oxygen or a mixture of oxygen and air to those suffering from lung disease in treatment with continuous positive airway pressure (CPAP) and in treatment situations using two pressure levels. It is used for a wide variety of purposes, such as supplying compressed air to people who suffer from respiratory disorders such as sleep apnea syndrome (OSA: OBSTRUCTIVE SLEEP APNEA) to supply anesthetic gas.

By the way, such a respiratory mask is provided with an endotracheal tube connector 100 that connects the respiratory mask and a device that sends respiratory gas.
As shown in FIG. 6, the endotracheal tube connector 100 has a mask side end 102 for connection in fluid communication with the inside of a respiratory mask (not shown), and a respiratory gas supply conduit (not shown). ) And a supply conduit side end 104 for fluid communication with the outlet, and a gas outflow ventilation passage 106 for breathing gas is provided between the mask side end 102 and the supply conduit side end 104. It is substantially vertical (L-shaped) (see Japanese Patent Application Laid-Open No. 2003-502116).

  Such an endotracheal tube connector 100 is designed in consideration of smoothly sending breathing gas or the like into the airway, so that its shape is made in accordance with the specifications of the respiratory mask.

On the other hand, in the case of oral surgery, a breathing mask that covers the mouth cannot be used, and oxygen supply is sent into the body through the nostril.
Such oxygen supply from the nostril portion is achieved by inserting an endotracheal tube into the nostril portion, and connecting the endotracheal tube and one side of an L-shaped endotracheal tube connector (hereinafter referred to as an angle piece) via a slip joint. And connecting the other side of the angle piece to the tube of the gas supply device.

However, when oxygen is supplied from the nostril portion to perform oral surgery, the angle piece may be an obstacle.
In other words, the angle piece has a connector shape (L-shape) that only considers sending respiratory gas to the respiratory mask attached to the nose and mouth, so the port or the tube connected to the port hinders dental treatment. There is a case.

  In addition, the angle piece is often used by diverting the angle piece for oral endotracheal tube into which the endotracheal tube is inserted from the mouth. In this case, too, the problem is that the form is too large to perform dental treatment. Has occurred.

For this reason, the method of supplying oxygen using the spiral tube which inserted the copper wire and the spiral coil inside without using an angle piece is taken.
Japanese translation of PCT publication No. 2003-502116

  However, such a method using a spiral tube has not been able to drastically solve the problem of oral surgery, and the inner layer resin part of the spiral tube is peeled off. It has been reported.

  Furthermore, since the angle formed by the two ports of the angle piece is 90 degrees, so-called L-shaped, the angle piece may be pulled in the direction of the respiratory apparatus when connected to the respiratory apparatus.

For this reason, the patient's nostril was compressed, and the problem which causes an ulcer was also exhibited.
In view of such a current situation, an object of the present invention is to provide a transnasal endotracheal tube connector that does not cause ulcers in a patient's nostril, and that greatly improves the operability of dental treatment.

  Furthermore, the present invention improves the mounting angle, position, and size of the port part, which is an adverse effect of intraoral treatment, and can easily insert a suction catheter to be used when removing the fistula into the endotracheal tube. It is an object of the present invention to provide a nasal endotracheal tube connector having an insertion port that allows for sanitary properties that can clean the inside of the nasal endotracheal tube connector.

The present invention was invented in order to achieve the problems and objects in the prior art as described above,
Nasal endotracheal tube connector of the present invention,
at least,
A trachea-insertion tube-side conducting portion having an opening on the trachea-insertion tube side connectable to a tube to be inserted into a patient's trachea;
A gas supply source side conduction portion having an opening on the gas supply source side connectable to the therapeutic gas supply source;
It is characterized by comprising a conducting tube constituting an acute angle bent portion.

  By configuring in this way, the tube does not get in the way during dental treatment, and the trachea insertion tube side conduction portion of the conduction tube is provided at the same angle as the direction of the nostril portion of the patient. The ulcer caused by the compression of the connector in the nostril portion of the patient can be reduced.

Nasal endotracheal tube connector of the present invention,
The nasal endotracheal tube connector is
The center of the opening on the trachea insertion tube side is the opening center A,
The center of the opening 2 on the gas supply source side is the opening center B,
A line connecting the opening center A and the opening center B is a straight line AB,
A line passing through the center of the conducting tube is a curve L,
A line parallel to the straight line AB and in contact with the curve L farthest is a straight line CD,
The contact portion between the straight line CD and the curve L is a contact point T,
A line connecting the opening center B and the contact T is a line BT,
A perpendicular is drawn from the opening center A to the line BT, and the point of contact is point H,
A line connecting the contact T and the point H is a line TH,
A line connecting the opening center A and the point H is a line AH,
When
The line TH has a length of 0 to 35 mm, and the line AH has a length of 5 to 50 mm.

  By configuring each part so as to be in such a range, the tube does not become an obstacle during dental treatment, and the trachea insertion tube side conduction part of the conduction pipe is the same as the direction of the patient's nostril part Since it is provided at such an angle, an ulcer caused by compression of the connector in the nostril portion of the patient can be reduced.

Nasal endotracheal tube connector of the present invention,
The nasal endotracheal tube connector is
The center of the opening on the trachea insertion tube side is the opening center A,
The center of the opening 2 on the gas supply source side is the opening center B,
A line connecting the opening center A and the opening center B is a straight line AB,
A line passing through the center of the conducting tube is a curve L,
A line parallel to the straight line AB and in contact with the curve L farthest is a straight line CD,
The contact portion between the straight line CD and the curve L is a contact point T,
A line connecting the opening center B and the contact T is a line BT,
A perpendicular is drawn from the opening center A to the line BT, and the point of contact is point H,
A line connecting the contact T and the point H is a line TH,
A line connecting the opening center A and the point H is a line AH,
When
The ratio of the length of the line TH to the line AH (TH / AH) is in the range of 3 to 0.08.

  By configuring each part so as to be in such a range, the tube does not become an obstacle during dental treatment, and the trachea insertion tube side conduction part of the conduction pipe is the same as the direction of the patient's nostril part Since it is provided at such an angle, an ulcer caused by compression of the connector in the nostril portion of the patient can be reduced.

As described above, in the present invention, configuring an acute-angled bent portion is specifically,
The length of the line TH is 0 to 35 mm, and the length of the line AH is in the range of 5 to 50 mm, and / or
This is a property exemplified by the definition that the ratio of the length of the line TH to the line AH (TH / AH) is in the range of 3 to 0.08.

Nasal endotracheal tube connector of the present invention,
The nasal endotracheal tube connector is
It has an insertion port into which a suction catheter can be inserted.

With this configuration, the suction catheter can be easily inserted into the endotracheal tube when the patient's heel is removed, and the inside of the connector is also excellently cleaned.
Nasal endotracheal tube connector of the present invention,
In the vicinity of the opening on the trachea insertion tube side and / or on the gas supply source side,
It has a tapered shape.

By comprising in this way, the tube inserted in a patient's trachea and the tube connected with a therapeutic gas supply source can be made easy to insert.
Nasal endotracheal tube connector of the present invention,
In the vicinity of the opening on the trachea insertion tube side and / or on the gas supply source side,
It is a bellows structure that can be bent and deformed.

With this configuration, it is possible to prevent the tube inserted into the patient's trachea or the tube connected to the therapeutic gas supply source from falling off.
Furthermore, since only the vicinity of the opening on the trachea insertion tube side and / or the opening on the gas supply source side has the bellows structure, the tube can be easily inserted and the angle can be finely adjusted. Furthermore, since the bent portion having an acute angle is maintained in the portions other than the bellows structure of the trachea insertion tube side conducting portion and the gas supply source side conducting portion, the tube does not become an obstacle during the dental treatment.

The dental nasal endotracheal tube connector of the present invention is
The nasal endotracheal tube connector according to any of the above,
It is used for dental and oral surgery treatment.

  As described above, when the nasal endotracheal tube connector is used for dental treatment, the tube does not get in the way especially when treating the mouth.

  According to the nasal endotracheal tube connector of the present invention, it is possible to improve the operability of dental treatment and reduce ulcers caused by the pressure of the nasal endotracheal tube connector in the patient's nostril.

  Further, by providing the insertion port, the suction catheter can be easily inserted into the endotracheal tube when removing the eyelid, and the inside of the nasal endotracheal tube connector is also excellently cleaned.

Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.
The present invention is not limited to these examples.
FIG. 1 is a side view for explaining the geometric features of the nasal endotracheal tube connector of the present invention.

  As shown in FIG. 1, the nasal endotracheal tube connector 10 of the present invention has a trachea insertion that can be connected to a tube (not shown) inserted into a patient's trachea on one side of the nasal endotracheal tube connector 10. It has an opening 12 on the tube side.

The opening 12 on the trachea insertion tube side is an opening provided at the distal end of the trachea insertion tube side conducting portion 16 for connecting and fixing the endotracheal tube.
Typically, it has one substantially circular shape, but is not particularly limited, and may be a flat ellipse or other polygon, or its edge as required. May be a three-dimensional curve that does not fit on the two-dimensional plane. Moreover, two or more openings may exist or may have a partition.

The diameter of the opening 12 on the trachea insertion tube side is preferably 0.3 to 1.5 cm.
Further, the other side of the nasal endotracheal tube connector 10 has a gas supply source side opening 14 that can be connected to a therapeutic gas supply source.

The opening 14 on the gas supply source side is an opening provided at the tip of the gas supply source side conducting portion 18 for connecting and fixing the therapeutic gas supply source.
The opening 14 on the gas supply source side, like the opening 12 on the trachea insertion tube side, typically has one substantially circular shape, but is not particularly limited, and as necessary. Further, it may be a flat oval shape or other polygonal shapes, or may be a case where the edge portion is a three-dimensional curve that does not fit on a two-dimensional plane. Moreover, two or more openings may exist or may have a partition.

The diameter of the opening 14 on the gas supply source side is preferably 0.5 to 3.0 cm.
The opening 12 on the trachea insertion tube side and the opening 14 on the gas supply source side are connected to each other by a conduction tube 22a that penetrates the intranasal endotracheal tube connector 10 and allows conduction of therapeutic gas having a bent portion. Yes.

  In FIG. 1, for convenience, the conducting tube 22a is divided into a trachea insertion tube side conducting portion 16, a gas supply source side conducting portion 18, and a bent conducting portion 20, but these are essentially continuous shapes. is there.

Next, geometrical elements forming the basis of parameters characterizing the present invention will be described with reference to FIG.
The opening center A on the trachea insertion tube side of the opening 12 on the trachea insertion tube side corresponds to the center of gravity of the shape drawn by the inner diameter portion of the outer edge of the opening.

Similarly, an opening center B on the gas supply source side of the opening 14 on the gas supply source side corresponds to the center of gravity of the shape drawn by the inner diameter portion of the opening.
In this case, the center of gravity is usually
Q ｜ minΣ _i Dst (P _i Q)
{P _i : (curve) each point of the figure (i = 1, 2 ....),
Dst (P _i Q): distance between P _i and Q,
Σ _i : arithmetic operation for summing up i
Q | min Σ _i Dst (P _i Q): Q when Σ _i Dst (P _i Q) is minimum}
It may be considered that the point Q is.

In order to simplify the calculation, the square of the distance may be used instead of the distance in the above formula.
Here, in order to set the geometrical reference, first, a straight line AB connecting the opening center A on the trachea insertion tube side and the opening center B on the gas supply source side is drawn. Further, a curve passing through the center of the conducting tube 22a having a bent portion and capable of conducting the therapeutic gas is defined as a curve L.

  The curve L defined by the conducting tube 22a can be generally considered to be the center line of the conducting tube 22a. Or you may consider it as the curve which tied the gravity center point of each cross section of the conduction pipe 22a. The curved line includes a straight broken line.

In this way, the straight line AB and the curved line L are defined.
Further, a straight line CD parallel to the straight line AB and farthest from the line L and contacting the curve L is defined, and a contact point T between the curve L and the straight line CD is set. When the curve L is a broken line as shown in FIG. 1 or a curve having a plurality of bending points, there may be a plurality of contacts T. In that case, the contact point T may be the midpoint between the two end points of the plurality of contact points T.

Next, a perpendicular line is drawn from the opening center A to the line BT, and the intersection is defined as an intersection H.
The reason why it is expressed as “line” as the line BT and is not limited to a straight line, a curve, or a composite line of these is because it can be a straight line or a curve. The same applies to the other “lines”.

The existence of the intersection H of the perpendicular to the line BT means that when the perpendicular is dropped to the line BT, the line BH <the line BT. More preferably, line TH <line BT.
In addition, when the line BT is a curve, it is possible that an appropriate perpendicular cannot be uniquely set. In such a case, the shortest line AH between the opening center A and the line BT is defined as a perpendicular AH. do it.

In this way, the geometric elements that form the basis of the parameters that characterize the present invention are defined.
Furthermore, in the connector of the present invention, the length of the line TH needs to be in the range of 0 to 35 mm, and the length of the line AH needs to be in the range of 5 to 50 mm.

The length of the line TH is preferably 1 to 30 mm, more preferably 3 to 25 mm, and the length of the line AH is preferably 10 to 40 mm, more preferably 15 to 35 mm.
When the length of the line TH falls below the lower limit of the above numerical range, the connector is compressed in the nostril portion.

On the other hand, if the length of the line TH exceeds the upper limit value, the openings 12 and 14 are too close to each other and are difficult to install in the nostril portion, which is not preferable.
Moreover, if the length of the line AH is less than the lower limit of the above numerical range, it is difficult to install the tip of the opening 12 in the nostril.

On the other hand, when the length of the line AH exceeds the upper limit value, the nasal endotracheal tube connector 10 protrudes to the front surface of the nostril portion and hinders dental treatment, which is not preferable.
The length of the line BT is preferably 20 to 70 mm, more preferably 30 to 60 mm.

When the length of the line BT is less than the lower limit of the above numerical range, it becomes difficult to connect the gas supply device (not shown) to the hoses.
On the other hand, if the length of the line BT exceeds the upper limit value, it is difficult to connect the gas supply device (not shown) to the hoses, which is not preferable.

In another aspect of the present invention, the ratio of the length of the line TH to the line AH (TH / AH) is 3 to 0.08, preferably 3 to 0.2, more preferably 2.5 to 0.00. 3, particularly preferably in the range of 2 to 0.4.
When the ratio (TH / AH) falls below the lower limit of the above numerical range, the patient's nostril is compressed.

On the other hand, if the ratio (TH / AH) exceeds the upper limit, it becomes difficult to insert a suction catheter (not shown), which is not preferable.
Further, in the nasal endotracheal tube connector 10 of the present invention, as shown in FIG. 2, the conducting tube 22b is composed of two pieces, that is, the tracheal insertion tube side conducting tube 24 and the gas supply source side conducting tube 26. good.

Furthermore, as shown in FIG. 3, the nasal endotracheal tube connector 10 may be constituted by a conducting tube 22c having a single smooth curve.
Moreover, although not shown in figure, the structure which consists of more than three straight lines, the structure which consists of several curves, or the structure which consists of a combination of a straight line and a curve may be sufficient.

Next, a preferred specific example of the nasal endotracheal tube connector of the present invention will be described with reference to FIG.
The nasal endotracheal tube connector 10 shown in FIG. 4 is provided with an insertion port 28 into which a suction catheter can be inserted in the vicinity of the bent conduction portion 20 between the tracheal insertion tube side conduction portion 16 and the gas supply source side conduction portion 18. ing.

Thus, the inside of the nasal endotracheal tube connector 10 can be easily cleaned, and the suction hose can be easily inserted through the insertion port 28 when removing the patient's heel or the like.
It is preferable that the tracheal insertion tube side conducting portion 16 for connecting and fixing the endotracheal tube has a tapered portion 30 at the tip portion so that the outer diameter thereof can be connected to various tubes.

Moreover, it is preferable that the structure is difficult to be removed once inserted into the tube. For example, one or more ring-shaped irregularities or a serpentine barb may be provided on the outer diameter portion.
Or it is more preferable that it has the structure which has flexibility, such as the bellows part 32, so that it can be freely bent and deformed.

  In addition, since the therapeutic gas supply source (not shown) is usually connected to the gas supply source side conduction unit 18 for connecting and fixing the therapeutic gas supply source (not shown) by a tube-shaped communication means. The gas supply source side conducting portion 18 also preferably has a tapered portion 34 like the tracheal insertion tube side conducting portion 16.

Further, it is natural that a bellows portion (not shown) may be provided in the tapered portion 34 of the gas supply source side conducting portion 18 in order to prevent the tube from coming off.
Next, another preferred specific example of the intranasal endotracheal tube connector of the present invention will be described with reference to FIG. 5A is a front view, FIG. 5B is a side view, FIG. 5C is a plan view, and FIG. 5D is FIGS. 5A and 5B. It is sectional drawing of the area from the aa 'line to bb' line.

The nasal endotracheal tube connector 10 shown in FIGS. 5A to 5C is a case where the curve passing through the center of the conducting tube is a three-dimensional curve.
In such a nasal endotracheal tube connector 10, the curve passing through the center of the conducting tube is a three-dimensional curve, and the gas supply source side conducting portion 18 of the nasal endotracheal tube connector 10 shown in FIG. It has a shape that is bent toward the back side of the drawing plane so as to have an angle of 50 degrees with respect to the drawing plane. About this angle, Preferably it is 0-80 degree | times, More preferably, it is 30-60 degree | times.

By being more than the lower limit of such a numerical range, it can avoid that the gas supply source side conduction | electrical_connection part 18 is arrange | positioned in front of a nose, and can escape to the side of a nose.
Thus, if the curve passing through the center of the conducting tube is a three-dimensional curve, it is preferable because the nose can be prevented from being pressed, and the gas tube does not hinder oral surgery by being below the upper limit. Is preferable.

  Alternatively, from a more abstract point of view, not limited to the figures shown in FIGS. 5A to 5C, the curves passing through the center of the conducting tube are sandwiched between two parallel planes so as not to be deformed. In this case, the minimum necessary distance between two planes is preferably 5 to 30 mm, more preferably 10 to 20 mm.

  The intersection M with the center line of the trachea-insertion-tube-side conduction part is placed on a straight line perpendicular to the opening 40 in the conduction path to the tracheal-insertion-tube-side conduction part 16 to which the gas supply source-side conduction part 18 is connected. The overhang length, which is the distance MN of the intersection N between the gas supply source side conducting portion 18 and the outer surface portion, is preferably 4 to 40 mm, more preferably 8 to 30 mm.

If it is in such a numerical range, the transnasal endotracheal tube connector 10 of this invention will be fitted to the human body shape around the nose with a stable and low burden.
Further, as described above, the form that holds the curve passing through the center of the conducting tube in a three-dimensional curve is not necessarily limited to the permanent fixed form, and any variable form may be used.

That is, the joint part of the trachea insertion tube side conducting part 16 and the gas supply source side conducting part 18 or its peripheral part is structured to be rotatable and / or bendable so as to correspond to the individual form of the patient's nose. It can be adjusted.
Such a variable form may be a flexible bendable structure such as a bellows part structure, and as shown in FIG. 5 (d), the outer diameter and the inner diameter are dimensionally designed so that they can be in close contact with each other. A rotatable insertion connection structure in which two cylinders having a taper are preferably inserted and joined via an O-ring 41 for enhancing airtightness therebetween.
5 (a) to 5 (c) also show the mode when the latter example is applied.

That is, the nasal endotracheal tube connector 10 of this specific example is for explaining the nasal endotracheal tube connector 10 having a three-dimensional curved path in a permanently fixed form, but is rotatable. In the case where a simple plug connection structure is provided, the installation position and the specific structure are also illustrated.
The preferred embodiments of the present invention have been described above, but the present invention is not limited to these.

For example, the position of the insertion port 28 may be provided on the side surface of the tracheal insertion tube side conducting portion 16, or a plurality of insertion ports 28 may be provided.
Furthermore, the nasal endotracheal tube connector of the present invention is not only used in the dental / oral surgery treatment as described above, but also, for example, the endotracheal tube needs to be inserted from the nose such as maxillofacial surgery and otolaryngology. It can be used in any case, and various changes and function additions can be made without departing from the object of the present invention.

FIG. 1 is a model illustrating a geometric overview of a nasal endotracheal tube connector of the present invention. FIG. 2 is an example of an embodiment of the nasal endotracheal tube connector of the present invention in which the conducting tube is formed of two straight lines. FIG. 3 is an example of one embodiment of the nasal endotracheal tube connector of the present invention in which the conducting tube is formed of a single curve. FIG. 4 is an example of one embodiment of the nasal endotracheal tube connector of the present invention having an insertion port. FIG. 5 shows another embodiment of the nasal endotracheal tube connector of the present invention having an insertion port, FIG. 5 (a) is a front view, FIG. 5 (b) is a side view, and FIG. 5 (c) is a plan view. FIG. 5 and FIG. 5D are cross-sectional views of the section from the aa ′ line to the bb ′ line in FIG. 5A and FIG. FIG. 6 is a schematic view of a conventional endotracheal tube connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Nasotracheal tube connector 12 ... Opening part 14 ... Opening part 16 ... Tracheal insertion tube side conduction | electrical_connection part 18 ... Gas supply source side conduction | electrical_connection part 20 ... Bending conduction | electrical_connection part 22a ..Conducting tube 22b..Conducting tube 22c..Conducting tube 24... Tracheal tube insertion side conducting tube 26... Gas supply source side conducting tube 28 .. Insertion port 30 .. Tapered portion 32. -Bellows part 34 ... Tapered part 40 ... Opening part in conduction path 41 ... O-ring A ... Center of opening part on trachea insertion tube side B ... Center of opening part on gas supply source side AB ... A straight line connecting the opening center A and the opening center B L ... A curve passing through the center of the conducting tube CD ... A straight line parallel to the straight line AB and in contact with the curve L farthest away T: Contact point between straight line CD and curve L BT: Line connecting opening center B and contact point H ..Points that are perpendicular to the line BT from the center of the opening and abut TH TH: line that connects the contact T and point H AH: line 100 that connects the center A of the opening and point H ... Endotracheal tube connector 102 ... mask side end 104 ... supply conduit side end 106 ... gas outflow ventilation passage

Claims (7)

at least,
A trachea-insertion tube-side conducting portion having an opening on the trachea-insertion tube side connectable to a tube to be inserted into a patient's trachea;
A gas supply source side conduction portion having an opening on the gas supply source side connectable to the therapeutic gas supply source;
A nasal endotracheal tube connector comprising a conducting tube constituting an acute angle bent portion. The nasal endotracheal tube connector is
The center of the opening on the trachea insertion tube side is the opening center A,
The center of the opening 2 on the gas supply source side is the opening center B,
A line connecting the opening center A and the opening center B is a straight line AB,
A line passing through the center of the conducting tube is a curve L,
A line parallel to the straight line AB and in contact with the curve L farthest is a straight line CD,
The contact portion between the straight line CD and the curve L is a contact point T,
A line connecting the opening center B and the contact T is a line BT,
A perpendicular is drawn from the opening center A to the line BT, and the point of contact is point H,
A line connecting the contact T and the point H is a line TH,
A line connecting the opening center A and the point H is a line AH,
When
The transnasal endotracheal tube connector according to claim 1, wherein the length of the line TH is in the range of 0 to 35 mm, and the length of the line AH is in the range of 5 to 50 mm. The nasal endotracheal tube connector is
The center of the opening on the trachea insertion tube side is the opening center A,
The center of the opening 2 on the gas supply source side is the opening center B,
A line connecting the opening center A and the opening center B is a straight line AB,
A line passing through the center of the conducting tube is a curve L,
A line parallel to the straight line AB and in contact with the curve L farthest is a straight line CD,
The contact portion between the straight line CD and the curve L is a contact point T,
A line connecting the opening center B and the contact T is a line BT,
A perpendicular is drawn from the opening center A to the line BT, and the point of contact is point H,
A line connecting the contact T and the point H is a line TH,
A line connecting the opening center A and the point H is a line AH,
When
2. The transnasal endotracheal tube connector according to claim 1, wherein a ratio of a length of the line TH to the line AH (TH / AH) is within a range of 3 to 0.08. The nasal endotracheal tube connector is
The intranasal endotracheal tube connector according to any one of claims 1 to 3, further comprising an insertion port into which a suction catheter can be inserted. The opening on the trachea insertion tube side and / or the opening on the gas supply source side are:
The nasal endotracheal tube connector according to claim 1, wherein the nasal endotracheal tube connector has a tapered shape. The opening on the trachea insertion tube side and / or the opening on the gas supply source side are:
The transnasal endotracheal tube connector according to any one of claims 1 to 5, wherein the nasal endotracheal tube connector has a bellows structure that can be bent and deformed. The nasal endotracheal tube connector according to any one of claims 1 to 6,
A dental nasal endotracheal tube connector for use in dental / oral surgery treatment.

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