JP2009005820A - Indicator for medical device with cuff - Google Patents

Abstract

The present invention provides an indicator for a medical device with a cuff that can quickly and accurately determine a decrease in internal pressure of the cuff.
An indicator for a medical device with a cuff attached to the medical device with a cuff and indicating an internal pressure of the cuff of the medical device. A check valve 4 connectable to injection means such as a syringe for injecting fluid into the cuff; a connection portion 2 connected to a cuffed medical device and communicating with the cuff; and the check valve 4 and the connection portion 2 And an indicator main body 3 provided therebetween. In the indicator body 3, a guide chamber 5 for guiding the fluid injected through the check valve 4 by the injection means to the connecting portion 2 side is formed integrally with the indicator body 3, and corresponds to the internal pressure of the cuff. Thus, it can be expanded and contracted. The indicator body 3 is formed with an indicator portion 7 that allows the degree of expansion / contraction of the guide chamber 5 to be visually recognized.
[Selection] Figure 2

Description

  The present invention relates to an indicator for a cuffed medical device that is attached to the cuffed medical device and indicates the internal pressure of the cuff of the medical device.

  2. Description of the Related Art Conventionally, in the medical field, a method of occluding a body passage using a cuffed (ballooned) medical device is well known. For example, an “intratracheal tube” used when performing artificial respiration has one end inserted through the patient's mouth (oral) or nose (transnasal) and the other end connected to the ventilator. In this state, when the cuff of the “intratracheal tube” is inflated in the trachea, the patient is obstructed below the trachea (lung), and is forced to breathe by the ventilator in communication with the inside of the “intratracheal tube”.

  Another example is a “pulmonary artery balloon catheter”. This involves inserting a catheter into a blood vessel via a suitable blood vessel, such as the carotid artery, and carrying the blood flow to reach the pulmonary artery. Therefore, the so-called “wedge insertion pressure”, in which blood enters the lungs by means of a sensor installed at the tip of the catheter after inflating the balloon, is measured.

  However, all such medical devices with a cuff (balloon) block the body passage due to the expansion of the cuff. In the “balloon catheter for pulmonary arteries”, a problem such as blood vessel damage has occurred.

  Conventionally, with respect to such a problem, it is possible to prevent overexpansion that occurs when the body passage is closed by the cuff, simplify its workability, and can be used for various medical devices with cuffs (balloons). A cuff (balloon) inflation aid is provided (see, for example, Patent Document 1).

  By the way, in the medical device with a cuff (balloon), the above-described problem occurs due to overexpansion. On the other hand, when the internal pressure of the cuff is lowered and the preset degree of expansion cannot be maintained, the trachea There are also problems such as obstruction due to insufficiency of forced breathing by the ventilator and lowering of the function of floating when the catheter is placed in the bloodstream to reach the pulmonary artery. This is because the cuff is formed of rubber or the like, so that air as a fluid leaks little by little at the molecular level, and the internal pressure decreases and the degree of expansion decreases.

Conventionally, with regard to such a decrease in internal pressure, for example, a pilot balloon has been provided at a branch portion of a medical device with a cuff to which a syringe is connected in order to inject air into the cuff, and the degree of expansion of the pilot balloon can be determined according to the appearance and feel. It is detected by confirming with.
JP 2003-116999 A

However, if the degree of expansion of the pilot balloon is confirmed based on the appearance and tactile sensation as described above and a decrease in the internal pressure of the cuff is detected, it takes time to confirm the degree of expansion, and some experience is required. That is, when the degree of expansion of the pilot balloon is confirmed by tactile sensation, it is said that the degree of expansion is appropriate to the degree of softness of the earlobe, but in reality the degree is ambiguous and therefore the cuff is quickly and accurately cuffed. It was very difficult to judge the decrease in internal pressure.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an indicator for a medical device with a cuff that can quickly and accurately determine a decrease in internal pressure of the cuff.

In order to achieve the above object, the indicator for a cuffed medical device of the present invention is an indicator for a cuffed medical device that is attached to the cuffed medical device and indicates the internal pressure of the cuff of the medical device,
A check valve connectable to injection means such as a syringe for injecting fluid into the cuff;
A connecting portion connected to the cuffed medical device and communicating with the cuff;
An indicator body provided between the check valve and the connecting portion,
In the indicator body, a guide chamber for guiding the fluid injected through the check valve by the injection means to the connecting portion side is formed integrally with the indicator body and corresponds to the internal pressure of the cuff. Is formed so that it can be expanded and contracted,
The indicator body is characterized in that an indicator portion is formed which makes it possible to visually recognize the degree of expansion / contraction of the guide chamber.

According to this indicator for a medical instrument with a cuff, when an injection means such as a syringe is connected to the check valve and a fluid such as air is injected, the fluid enters the cuff through the guide chamber and the connecting portion. Therefore, the cuff can be expanded to a predetermined degree of expansion. Even if the injection means is removed from the check valve in this state, the check valve acts so that the air (fluid) in the cuff does not leak outside through the guide chamber.
Further, when the cuff is held in an expanded state in this way, the guide chamber communicating with the cuff expands in accordance with the internal pressure of the cuff. Therefore, by visually checking the expansion degree (expansion / contraction degree) of the guide chamber with the indicator part, it is possible to quickly and accurately determine a decrease in the internal pressure of the cuff.
Further, since the guide chamber is formed integrally with the indicator body, air (fluid) in the guide chamber is difficult to leak outside, and manufacture (assembly) of the indicator body including the guide chamber is facilitated.

Further, in the indicator for a cuffed medical instrument, the guide chamber is configured to expand and contract in the length direction of the side wall portion formed in a bellows shape because the side wall portion is formed in a bellows shape. It is preferable.
In this way, the guide chamber is mechanically expanded and contracted by the expansion and contraction of the bellows-like side wall, so that the guide chamber expands and contracts compared to the case where it expands and contracts only by elastic deformation of a material made of an elastic material such as a balloon. Therefore, the relationship between the internal pressure of the cuff and the degree of expansion / contraction of the guide chamber is kept constant over a long period of time.

Further, in the indicator for a medical instrument with a cuff, the check valve includes a cylinder body into which the injection means is inserted, and a resin attached between a valve seat formed in the cylinder body and the guide chamber. The valve body has an elastic portion that can be elastically deformed on the guide chamber side, and the elastic portion is disposed in contact with the guide chamber side. Therefore, it is preferable that the inner hole of the cylindrical body is airtightly closed by being biased toward the valve seat.
In this way, the check valve can be formed entirely of resin without using a metal spring, and therefore it is not necessary to perform separation at the time of disposal, so that the disposal process is facilitated.

In the cuff medical instrument indicator, it is preferable that an opening for exposing the expansion / contraction surface of the guide chamber is formed in the indicator body.
In this way, by touching the expansion / contraction surface of the guide chamber with a finger through the opening, it is possible to detect the internal pressure of the cuff by tactile sensation in addition to the detection of the internal pressure of the cuff by visually recognizing the indicator portion. Become.

Further, in the indicator for a cuffed medical instrument, the indicator portion is provided in the indicator main body so that the guide chamber can be visually recognized, and the guide chamber is provided in or near the window portion. And an index for determining the appropriateness of the internal pressure of the cuff corresponding to the degree of expansion / contraction.
In this way, when visually recognizing the indicator portion, it is possible to easily determine whether the internal pressure of the cuff is appropriate or not by comparing the expansion / contraction degree of the guide chamber viewed through the window portion with the indicator.

Further, in the indicator for a medical instrument with a cuff, the indicator part is formed on the inflating / contracting surface of the guiding chamber and the indicator body, and the projecting part is provided on the indicator body. It may have an in / out hole that protrudes outward so as to be in / out.
In this way, it is possible to easily determine whether the internal pressure of the cuff is appropriate by visually recognizing whether or not the protruding portion protrudes from the intrusion hole or the degree to which the protruding portion protrudes.

In the indicator for a medical device with a cuff of the present invention, when the cuff is held in an expanded state, the guide chamber communicating with the cuff is adapted to expand corresponding to the internal pressure of the cuff. By visually recognizing the degree of expansion (expansion / contraction) of the guide chamber with the indicator, it is possible to quickly and accurately determine a decrease in the internal pressure of the cuff. Therefore, there is no inconvenience that it takes time to detect a decrease in internal pressure as in the prior art, and that some experience is required.
Further, since the guide chamber is formed integrally with the indicator body, the air (fluid) in the guide chamber is not easily leaked to the outside, and therefore the reliability is high. Furthermore, since the guide chamber is formed integrally with the indicator body, and therefore, the manufacture (assembly) of the indicator body including the guide chamber is facilitated, the manufacturing cost can be reduced.

The present invention will be described in detail below.
First, prior to the description of the cuffed medical instrument indicator of the present invention, the cuffed medical instrument to which the indicator is attached will be described. FIG. 1A is a view showing a cuffed medical device to which an indicator 1 of the present invention is attached, and FIG. 1B is a view showing a conventional cuffed medical device.

In FIG. 1B, reference numeral 50 denotes a general endotracheal tube as a cuffed medical device, and this conventional cuffed medical device (intratracheal tube) 50 includes a connector 60 that can be connected to an artificial respirator. The infusion part 70 for inflating the cuff, the tube 80 inserted into the trachea of the patient, and the cuff (balloon) 90 for closing the trachea are configured.
The connector 60 has a cylindrical shape as a whole, and includes a first connection cylinder 61 for connection to a ventilator and a second connection cylinder 62 that is airtightly fitted to a tube body 81 to be described later. Has been.

The injection unit 70 includes a connection tube 71 connected to the tube 80, a pilot balloon 72, and a check valve 73. The pilot balloon 72 is a balloon-like one having openings on both sides, and is for confirming the internal pressure of the cuff 90 communicating with the pilot balloon 72 by confirming its inflated state by appearance and touch as described above. . The check valve 73 allows air (fluid) to flow only from the side opposite to the pilot balloon 72 and is configured not to escape from the pilot balloon 72 side. It becomes an inflow port for inflow.
In the injection portion 70 having such a configuration, in particular, the internal pressure of the cuff 90 is examined (confirmed) based on the appearance of the pilot balloon 72 and its tactile sensation. There was a problem of needing experience.

  Therefore, in the present invention, the indicator 1 is connected to the connection tube 71 as shown in FIG. The indicator 1 includes a cuff side connection portion 2 connected to a connection tube 71, a substantially rectangular parallelepiped indicator main body 3, and a syringe side connection portion 4 serving as a check valve. The indicator 1 having such a configuration can easily confirm the internal pressure of the cuff 90 by visually recognizing an indicator portion (not shown) of the indicator body 3. The details of the indicator 1 will be described later.

  The tube 80 includes a tube body 81, a first hole 82 that penetrates the entire length of the tube body 81, a second hole 83 that penetrates a part of the tube body 81, and a distal end side of the tube body 81 ( The first opening 84 communicates between the second hole 83 and the outside on the patient side, and the second opening 85 communicates between the second hole 83 and the outside on the other end side of the tube main body 81. The connection tube 71 is hermetically bonded and fixed to the tube body 81 in the second opening 85.

  The cuff 90 is a balloon-like object provided so as to cover the first opening 84, and both ends thereof are hermetically bonded and fixed to the outer surface of the tube main body 81, so that the inside opens the first opening 84. Only through the outside. That is, the cuff 90 communicates with the second hole 83 and the connection tube 71 through the first opening 84.

  Next, details of the indicator 1 will be described. The indicator 1 is a first embodiment of the indicator for a cuffed medical device according to the present invention. As shown in FIGS. 2 (a) and 2 (b), the cuff side connecting portion 2 connected to the connecting tube 71 is provided. And an indicator body 3 having a substantially rectangular parallelepiped shape and a syringe-side connecting portion (check valve) 4.

  As shown in the side sectional view of FIG. 3A and the exploded perspective view of FIG. 4, the cuff-side connection portion 2 is a cylinder that is connected to and communicates with the connection tube 71 inserted (or extrapolated). It is made of resin and includes a portion 2a and a substantially annular connecting portion 2b that is fitted to the indicator main body 3 continuously to one end side of the cylindrical portion 2a.

  In this embodiment, the indicator main body 3 has a substantially rectangular parallelepiped shape made of a soft vinyl chloride resin, and a guide chamber 5 is integrally formed therein as shown in FIGS. 3 (a), 3 (b), and 4. Is. The guide chamber 5 has one side communicating with the syringe side connecting portion 4 and the other side communicating with the cuff side connecting portion 2, and the cuff side connecting the air injected through the syringe side connecting portion 4. It functions as a guide route for guiding to the section 2. Further, the guide chamber 5 is formed integrally with the indicator body 3 as described above, and thus is formed of soft vinyl chloride resin that can be elastically deformed, so that it corresponds to the internal pressure of the cuff 90 as described later. It can be expanded and contracted.

  In addition, as shown in FIG. 3 (b), which is a cross-sectional view taken along the line AA in FIG. 3 (a), the guide chamber 5 has a side wall portion 5a in which mountain portions 6a and valley portions 6b are alternately arranged. It is formed in a bellows shape that is repeated. With such a configuration, apart from the soft vinyl chloride resin described above, the guide chamber 5 is mechanically moved in the length direction, that is, in the direction of arrow B in FIG. It can be stretched. Therefore, the guide chamber 5 can be expanded and contracted by both being an elastically deformable resin and the side wall portion 5a being formed in a bellows shape.

  Since the guide chamber 5 expands / contracts, that is, expands / contracts particularly in the length direction of the side wall portion 5a, the surfaces positioned on both sides in the direction of arrow B in FIG. The expansion / contraction surface 5b expands / contracts according to the internal pressure. That is, the guide chamber 5 includes a pair of side wall portions 5a arranged opposite to each other as shown in FIGS. 3A and 3B, and a pair of expansion surfaces 5b arranged opposite to each other. Further, as shown in FIG. 4, one opening side is covered with the connecting portion 4 b of the syringe side connecting portion 4, and the other opening side is covered with the syringe side connecting portion 4, thereby communicating with the cuff 90. An airtight space is formed.

  In addition, as shown in FIG. 4, the indicator body 3 is formed with openings (not shown) on the outer sides of the side walls 5a and 5a of the guide chamber 5, and a cover 7 is formed in these openings. It is fitted by press-fitting and fixed by welding or adhesion. The cover 7 constitutes an index portion in the present invention, and is made of a transparent hard resin such as polycarbonate. The cover 7 is formed with a transparent window portion 7a in the center thereof, and in the vicinity of the window portion 7a, in this embodiment, line-shaped indexes 7b are formed on both sides of the window portion 7a.

  Since the cover 7 is formed of a transparent resin, the window 7a allows the guide chamber 5 in the indicator body 3 to be viewed through the window 7a. Therefore, the position of the expansion surface 5b constituting the guide chamber 5 is visible through the window portion 7a. The index 7b is formed on the cover 7 in green or the like by printing or the like, and is formed with a predetermined width corresponding to the position of the expansion surface 5b. That is, the index 7b indicates a range in which the expansion / contraction degree of the guide chamber 5 that expands / contracts in accordance with the internal pressure of the cuff 90 is appropriate in use.

  FIG. 5 is a diagram showing a state in which the guide chamber 5 is expanded during use. In this figure, if the expansion surface 5b of the guide chamber 5 is positioned within the width of the index 7b as indicated by a line indicated as “OK”, the expansion / contraction degree (expansion degree) of the guide chamber 5 corresponding to the internal pressure of the cuff 90 is illustrated. ) Is appropriate, that is, it indicates that the internal pressure of the cuff 90 is appropriate. On the other hand, if it is located outside the index 7b as indicated by the line indicated as “NG1”, the expansion / contraction degree (expansion degree) of the guide chamber 5 is excessive, and the internal pressure of the cuff 90 exceeds the appropriate range. Indicates. Moreover, if it is located inside the index 7b as shown by the line shown as “NG2”, the expansion / contraction degree (expansion degree) of the guide chamber 5 is too small, and the internal pressure of the cuff 90 is below the appropriate range. It shows that. Therefore, the appropriateness of the internal pressure of the cuff 90 can be easily visually confirmed by comparing the position of the expansion surface 5b seen through the window 7a with the index 7b.

  It should be noted that it is preferable that the portion of the cover 7 where the index 7b is formed, that is, the portion other than the window portion 7a, is colored opaque with a color (for example, white) different from the color of the index 7b. By hiding the inside of the indicator body 3 by coloring in this way, the position of the expansion surface 5b viewed through the window portion 7a can be easily seen, and the comparison with the index 7b is facilitated.

  Further, as shown in FIG. 4, the indicator body 3 is formed with openings 8 on the outer sides of the expansion surfaces 5 b and 5 b of the guide chamber 5. These openings 8 are formed in a substantially elliptical shape in the present embodiment, and have such a size that a fingertip can be inserted, for example, the major axis is about 18 mm and the minor axis is about 15 mm. Under such a configuration, the guide chamber 5 can be picked up from both sides by touching the expansion surface 5b through the opening 8 with a finger. Therefore, the internal pressure of the cuff 90 can be detected by tactile sensation separately from the internal pressure detection of the cuff 90 by visual recognition through the window portion 7a.

  As shown in FIGS. 3A and 4, the syringe-side connecting portion 4 includes a cylindrical portion 4a for inserting and connecting injection means (not shown) such as a syringe, and one end side of the cylindrical portion 4a. A substantially annular connecting portion 4b that is continuously fitted to the indicator main body 3, and is made of resin, and forms a cylinder that constitutes a check valve in the present invention. As shown in FIG. 3A, a hole 9 is formed in the connecting portion 4b so as to communicate with the inside of the guide chamber 5 of the indicator body 3 and to the cylindrical portion 4a. The hole 9 has a large diameter portion 9a disposed on the guide chamber 5 side, a small diameter portion 9b disposed on the cylindrical portion 4a side, and a taper that continues between the large diameter portion 9a and the small diameter portion 9b. It consists of the part 9c, and hold | maintains the valve body 10 so that advancing and retreating is possible.

  As shown in FIGS. 3A and 4, the valve body 10 includes a cylindrical shaft portion 10a, and a bowl-shaped elastic portion integrally formed on one end side of the shaft portion 10a, that is, on the guide chamber 5 side. 10b made of soft resin. The shaft portion 10a is formed to have a smaller diameter than the small diameter portion 9b, and is disposed so as to extend into the internal hole of the cylindrical portion 4a through the small diameter portion 9b. The tip of the shaft portion 10a, that is, the end opposite to the elastic portion 10b, is brought into contact with the injection port of the syringe, and a groove 10c is formed at the tip. When the injection port of the syringe is brought into contact with the distal end portion of the shaft portion 10a, the groove 10c does not close the injection port with the distal end portion, and at least the interior of the injection port is inserted through the groove 10c. This is for communicating with the four internal holes.

  The elastic portion 10b is formed in a bowl shape as described above, and the opening side of the bowl, that is, the edge side of the valve body 10 abuts on the guide chamber 5 side, and the bottom side outer surface of the bowl is the hole 9. This is in contact with the tapered surface of the tapered portion 9c. In such a state, the elastic portion 10b is held by the large diameter portion 9a and the tapered portion 9c. With such a configuration, the hole 9 functions as a valve seat for holding the valve body 10 in particular with the tapered surface of the tapered portion 9c.

  Further, as shown in FIG. 4, the opening side of the bowl in the elastic portion 10 b is connected to the end edge of the expansion surface 5 b of the guide chamber 5, and the partition wall 11 that connects the end edge to the inner surface of the indicator body 3. Abut. And this elastic part 10b is formed so that elastic deformation is possible by consisting of soft resin. Under such a configuration, the elastic portion 10 b receives a reaction force from the partition wall 11 by abutting against the partition wall 11 and biases the shaft portion 10 a to the side opposite to the partition wall 11. Therefore, the valve body 10 is normally urged to the side opposite to the partition wall 11 by the urging force of the elastic portion 10b, whereby the shaft portion 10a side of the elastic portion 10b, that is, the bowl-shaped bottom outer surface is As described above, the small diameter portion 9b of the hole 9 is hermetically closed by abutting against the tapered surface of the tapered portion 9c.

  As described above, the cylindrical portion 4a is connected to the internal hole by inserting an injection portion (not shown) of a syringe. In the present embodiment, the internal hole is formed in a tapered shape so that the diameter gradually decreases from the opening side toward the small diameter portion 9b side of the hole 9 of the connecting portion 4b, and the shaft portion 10a of the valve body 10 is formed. A constant inner diameter is formed between the vicinity of the distal end of the rim and the small diameter portion 9b. The check portion of the present invention is constituted by the cylindrical portion 4a having such a configuration, the connecting portion 4b continuous therewith, and the valve body 10 provided in the holes and the holes.

Next, a method of using the cuffed medical device (intratracheal tube) 50 including the indicator 1 having such a configuration will be described.
As shown in FIG. 6, first, the cuffed medical device 50 is used for a patient according to a normal usage method. That is, the distal end side of the tube 80 is inserted from the patient's mouth 100, and the cuff 90 reaches the trachea 101.

  Next, a syringe (not shown) is connected to the syringe side connection portion 4 of the indicator 1. That is, the distal end side of the syringe is placed in the inner hole of the cylindrical portion 4a, and the shaft portion 10a of the valve body 10 is pressed by the distal end portion. Then, the valve body 10 is pushed against the urging force of the elastic portion 10b, and the shaft portion 10a is pushed in. As a result, the elastic portion 10b is elastically deformed and separated from the tapered surface of the tapered portion 9c. The part 9a communicates. As a result, the check valve is opened.

  Under such a state, the syringe is operated to inject a predetermined amount of air. Then, the injected air passes through the small diameter portion 9b and the tapered portion 9c, passes through the large diameter portion 9a, and flows into the guide chamber 5 of the indicator body 3. The air that has passed through the guide chamber 5 reaches the internal hole of the cuff side connection portion 2, and further passes through the connection tube 71 connected to the cuff side connection portion 2 and the second hole 83 of the tube 80. And flows into the cuff 90 from the first opening 84. By injecting air in this way, the cuff 90 expands to a degree of expansion corresponding to its internal pressure. When air flows into the guide chamber 5 in this manner, a part of the air stays in the guide chamber 5 and expands the guide chamber 5.

  When air is injected in this manner, the syringe is removed from the syringe-side connecting portion 4. Then, the valve body 10 is urged | biased by the urging | biasing force by the elastic return of the elastic part 10b by releasing the pressing force to the axial part 10a, and moves. Therefore, the bowl-shaped bottom outer surface of the elastic portion 10b comes into airtight contact with the taper surface of the taper portion 9c again, and airtightly closes the small diameter portion 9b of the hole 9. As a result, the check valve is closed again.

  When the small-diameter portion 9b of the hole 9 is closed in this way and the check valve is closed, the cuff 90 is a space closed to the atmosphere side by the connection tube 71 side being airtightly closed by the indicator 1. It becomes. Further, since the guide chamber 5 of the indicator body 3 communicates with the cuff 90, it expands in response to the internal pressure of the cuff 90. That is, since the guide chamber 5 communicates with the atmosphere (outside) through the opening 8, the guide chamber 5 is configured according to the pressure difference between the internal pressure of the cuff 90 and the atmospheric pressure, that is, corresponding to the internal pressure of the cuff 90. It expand | swells as shown in FIG.2 (b) from the state shown to (a).

At that time, by confirming the position of the expansion surface 5b of the guide chamber 5 through the window portion 7a and comparing this with the index 7b, it is possible to easily recognize whether the internal pressure of the cuff 90 is appropriate. That is, as shown in FIG. 5, the internal pressure of the cuff 90 is appropriate by checking whether the expansion surface 5b of the guide chamber 5 is located within the width of the index 7b or outside the width of the index 7b. It can be easily determined whether or not.
In addition to the visual recognition in this way, the internal pressure of the cuff 90 can be detected by the tactile sensation by touching the expansion surface 5b of the guide chamber 5 with the finger through the opening 8 of the indicator body 3 and picking it from both sides. Can do. Therefore, the suitability of the internal pressure of the cuff 90 can be more reliably determined by double checking the degree of expansion of the guide chamber 5.

In addition, when the internal pressure (expansion degree) of the cuff 90 is confirmed in this way, the internal pressure of the cuff 90 is decreased when the internal pressure is below the minimum value in the allowable range or when time passes. When this is confirmed, the cuff 90 can be expanded at a predetermined internal pressure by connecting the syringe again and injecting air. It should be noted that the cuff 90 can be inflated without excess or deficiency by inspecting the degree of expansion (expansion / contraction degree) of the guide chamber 5 also when injecting air with the syringe.
Thereafter, artificial respiration is performed by a ventilator (not shown) connected to the connector 60 of the cuffed medical device (intratracheal tube) 50.

In such an indicator 1, the guide chamber 5 communicating with the cuff 90 is configured to expand (expand / contract) in response to the internal pressure of the cuff 90. By visual confirmation or tactile confirmation, it is possible to quickly and accurately determine whether the internal pressure of the cuff 90 is appropriate, that is, whether the internal pressure of the cuff 90 is reduced. Accordingly, there is no inconvenience that it takes time to detect a decrease in internal pressure or a certain amount of experience is required as in the conventional case, and it is possible to reliably prevent unexpected accidents.
Further, since the guide chamber 5 is formed integrally with the indicator main body 3, the air (fluid) in the guide chamber 5 is not easily leaked to the outside, and therefore the reliability is high. Furthermore, since the guide chamber 5 is formed integrally with the indicator body 3, and thus the manufacture (assembly) of the indicator body 3 including the guide chamber 5 is facilitated, the manufacturing cost can be reduced.

Further, since the side wall portion 5a of the guide chamber 5 is formed in an accordion shape, the guide chamber 5 is mechanically expanded and contracted by the expansion and contraction of the side wall portion 5a, and therefore only by elastic deformation of the material made of an elastic body. Compared to the case of expansion and contraction, the degree of reduction in restoration due to deterioration such as sag is reduced. Therefore, the relationship between the internal pressure of the cuff 90 and the degree of expansion / contraction of the guide chamber 5 is kept constant over a long period of time, thereby ensuring the reliability of the indicator 1 over a long period of time.
Further, the cylindrical portion 4a, the connecting portion 4b, and the valve body 10 constituting the check valve are all made of resin and do not have a metal spring or the like, and further, the indicator body 3 and the cuff side connecting portion 2 Since they are all made of resin, it is not necessary to separate the indicator 1 when it is discarded, and therefore the disposal process becomes extremely easy.

Next, 2nd Embodiment of the indicator for medical devices with a cuff of this invention is described.
FIG. 7 is a view showing a second embodiment of the indicator for a cuffed medical device according to the present invention, and reference numeral 20 in FIG. 7 denotes an indicator. The indicator 20 is mainly different from the indicator 1 of the first embodiment in the configuration of the indicator section.

  That is, the indicator 20 does not have the window 7a or the index 7b in the cover 7, and the opening 8 for confirming the degree of expansion / contraction of the guide chamber 5 with a tactile sensation is not formed. The indicator portion is constituted by the protruding portion 21 and the like provided in the guide chamber 5. As shown in FIGS. 8A and 8B, the protrusion 21 is provided at the center of the expansion surface 5 b of the guide chamber 5, and moves integrally with the expansion surface 5 a by the expansion and contraction of the guide chamber 5 ( It is something that advances and retreats.

  The indicator main body 22 is formed with an in / out hole 23 for projecting the protrusion 21 so that the protrusion 21 can protrude and retract at a position corresponding to the protrusion 21, and a cap 24 made of a transparent resin is covered in the in / out hole 23. It is worn. The cap 24 is formed in a size and shape that does not interfere with the protrusion 21 that moves (advances and retreats) integrally with the expansion and contraction of the guide chamber 5, and therefore does not hinder the movement of the protrusion 21. .

  In this embodiment, the protrusion 21 is made of a resin-made covered cylindrical indicator attached to a convex portion (not shown) formed integrally with the expansion surface 5b of the guide chamber 5, and is bonded as necessary. They are formed by welding and integrated. Here, as shown in FIGS. 9A to 9C, the protrusion 21 has a color in which the adherend is different in the base end 21a and the front end 21b on the expansion surface 5b side, for example, the base end 21a. Is red and the tip 21b is colored blue. Under such a configuration, the degree of protrusion of the protrusion 21 from the in / out hole 23 varies depending on the degree of expansion (expansion / contraction) of the guide chamber 5, thereby making it possible to visually recognize the expansion / contraction of the guide chamber 5. It functions as an indicator part.

  That is, the state (protrusion degree) of the protruding portion 21 changes corresponding to the internal pressure of the cuff 90 as shown in FIGS. That is, before injecting air into the cuff 90, the guide chamber 5 does not expand, and thus the protrusion 21 is not visually recognized in the cap 24 as shown in FIG. In addition, when air is injected with a syringe during use, the guide chamber 5 also expands corresponding to the internal pressure of the cuff 90, and the expansion surface 5b expands outward. Then, the protrusion 21 moves forward, protrudes from the intrusion hole 23 and appears in the cap 24. At this time, if the internal pressure of the cuff 90 is appropriate, only the tip portion 21b colored in blue appears in the cap 24 and is visible as shown in FIG. 9B. . Further, when air is excessively introduced and the internal pressure of the cuff 90 exceeds an appropriate range, the guide chamber 5 is excessively expanded, so that the protrusion 21 is formed as shown in FIG. The base end portion 21a colored in red appears in the cap 24 and is visible.

Therefore, it is possible to easily and accurately determine whether or not the internal pressure of the cuff 90 is appropriate by visually recognizing whether or not the protrusion 21 is visually recognized in the cap 24 and further, what color is the color. Can do.
Therefore, even in such an indicator 20, the appropriateness of the internal pressure of the cuff 90, that is, the decrease in the internal pressure of the cuff 90, etc. can be quickly observed by visually confirming the degree of expansion / contraction of the guide chamber 5 by the projection 21 serving as the index portion. Moreover, it can be accurately determined. Accordingly, there is no inconvenience that it takes time to detect a decrease in internal pressure or a certain amount of experience is required as in the conventional case, and it is possible to reliably prevent unexpected accidents.

  As for the shape of the protruding portion, for example, the tip portion 25a has a substantially hemispherical shape as in the protruding portion 25 shown in FIG. 10, and the outer diameter of the substantially hemispherical tip portion 25a is larger than that of the protrusion / exit hole 23. The projecting portion 25 may be configured to always protrude from the in / out hole 23. Even in this case, the protrusion 25 has a different color on the distal end side and the proximal end side as in the protrusion 21 shown in FIG. Whether or not can be determined. By configuring the protrusion 25 in this way, the protrusion is deformed to contact the in / out hole 23 and the protrusion no longer protrudes normally from the in / out hole 23 even though the guide chamber 5 is expanded. Such inconvenience can be prevented in advance.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the first embodiment, a plurality of lines of different colors are provided as the index 7b, and it is possible to determine whether the internal pressure of the cuff 90 is appropriate based on which color line (index) the expansion surface 5b is located on. It may be.
In the embodiment, a plurality of protrusions having different heights may be provided so that it can be determined whether or not the internal pressure of the cuff 90 is appropriate depending on how many protrusions are visible.

Further, the structure of the check valve and the structure of the guide chamber 5 for communicating the check valve side and the cuff 90 side are not limited to the structure of the above-described embodiment, and various forms can be adopted. .
Furthermore, the cuffed medical device in which the present invention is used can be applied to various devices such as a pulmonary artery balloon catheter other than the endotracheal tube.

It is a figure which shows schematic structure of a medical device with a cuff, (a) is a figure which shows the medical device with a cuff which attaches the indicator of this invention, (b) is a figure which shows the conventional medical device with a cuff. (A), (b) is a perspective view which shows schematic structure of 1st Embodiment of the indicator for medical devices with a cuff of this invention. (A) is a sectional side view which shows schematic structure of the indicator for medical devices with a cuff shown in FIG. (B) is the sectional view on the AA arrow line of (a). It is a disassembled perspective view of the indicator for medical devices with a cuff shown in FIG. It is action | operation explanatory drawing of the indicator for medical devices with a cuff shown in FIG. It is a figure for demonstrating the usage method of a medical device with a cuff. It is a perspective view which shows schematic structure of 2nd Embodiment of the indicator for medical devices with a cuff of this invention. (A), (b) is a sectional side view which shows schematic structure of the indicator for medical devices with a cuff shown in FIG. (A)-(c) is effect | action explanatory drawing of the indicator for medical devices with a cuff shown in FIG. It is a figure which shows the modification of the indicator for medical devices with a cuff shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,20 ... Indicator (medical instrument indicator with a cuff), 2 ... Cuff side connection part (connection part), 3, 22 ... Indicator main body, 4 ... Syringe side connection part (check valve), 5 ... Guide room, 5a ... Side wall portion, 5b ... expanded surface, 7 ... cover (index portion), 7a ... window portion, 7b ... index, 8 ... opening portion, 9 ... hole, 9a ... large diameter portion, 9b ... small diameter portion, 9c ... taper portion, DESCRIPTION OF SYMBOLS 10 ... Valve body, 10b ... Elastic part, 11 ... Partition, 21, 25 ... Projection part, 23 ... In / out hole, 50 ... Medical device with cuff

Claims (6)

An indicator for a medical device with a cuff attached to the medical device with a cuff and indicating an internal pressure of the cuff of the medical device,
A check valve connectable to injection means such as a syringe for injecting fluid into the cuff;
A connecting portion connected to the cuffed medical device and communicating with the cuff;
An indicator body provided between the check valve and the connecting portion,
In the indicator body, a guide chamber for guiding the fluid injected through the check valve by the injection means to the connecting portion side is formed integrally with the indicator body and corresponds to the internal pressure of the cuff. To be inflatable
An indicator for a medical device with a cuff, wherein the indicator body is formed with an indicator portion that enables visual recognition of the degree of expansion / contraction of the guide chamber.   The cuff according to claim 1, wherein the guide chamber is configured to expand and contract in a length direction of the side wall portion formed in a bellows shape by forming the side wall portion in a bellows shape. Indicator for medical equipment.   The check valve includes a cylinder body into which the injection means is inserted, and a resin valve body attached between a valve seat formed in the cylinder body and the guide chamber, The valve body has an elastic portion that can be elastically deformed on the guide chamber side, and the elastic portion is disposed in contact with the guide chamber side, so that the valve body is urged toward the valve seat side and is The indicator for a cuffed medical device according to claim 1 or 2, wherein an inner hole of the cylindrical body is airtightly closed.   The said indicator main body is formed with the opening part which exposes the expansion / contraction surface which the said guide chamber expands / contracts, The indicator for medical devices with a cuff as described in any one of Claims 1-3 characterized by the above-mentioned. .   The indicator portion is provided in the indicator main body so as to make the guide chamber visible, and the indicator portion is provided in or near the window portion and has an internal pressure of the cuff corresponding to the degree of expansion / contraction of the guide chamber. The cuffed medical instrument indicator according to any one of claims 1 to 4, further comprising an index for determining suitability.   The indicator portion has a protrusion provided on the expansion / contraction surface of the guide chamber, and a protrusion / extraction hole formed on the indicator main body to project the protrusion on the outer side of the indicator main body. The cuffed medical instrument indicator according to any one of claims 1 to 4, wherein the cuffed medical instrument indicator is formed.

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