JP3158407U - Nostril cannula - Google Patents

Abstract

There is provided a nostril cannula in which a resonance point is changed to reduce noise by changing a connection length of a tube connected to an end portion. A cylindrical body having a central portion in the length direction and a pair of end portions at both ends of the central portion, and a pair of projecting portions orthogonal to the length direction is provided in the central portion, and these In the nostril cannula 11 in which a pair of projecting portions are inserted into the nostril, the insertion depth of the tube 15 with respect to the ends provided at both ends of the central portion is within a range of 4 to 8 mm, particularly within a range of 5 to 7 mm. And As a result, the resonance point is shifted to reduce noise during oxygen outflow. [Selection] Figure 2

Description

  The present invention relates to a nostril cannula, and in particular, a medical device for respiratory therapy, wherein a nostril is provided with a pair of protrusions inserted into the nostril at the center between both ends connected to the tube. Regarding cannulae.

  For example, as disclosed in Utility Model Registration No. 3107787 and Utility Model Registration No. 3108599, a nostril cannula is used for oxygen therapy or respiratory therapy for patients with dyspnea or hypoxia. The nostril cannula is mounted on the face along the left-right direction at the site under the nose, and a pair of protrusions provided at the middle part are inserted into the entrance part of the nostril to draw oxygen from the oxygen supply source. It is supplied into the nostril through the tube and the protrusion.

  In such a nostril cannula, especially when the flow rate of the supplied oxygen is increased, the noise increases accordingly. The patient goes to bed while wearing it at night, but at night, there is a problem that it feels uncomfortable due to noise, or becomes insomnia.

  As described above, the noise associated with the outflow of the gas from the nostril cannula is generated by the increase in the flow rate of oxygen, and although it depends on the flow rate of oxygen, the noise is also influenced by the size of the nostril cannula itself. ing. That is, it has been found that noise is increased when the size of the nostril cannula is reduced. On the other hand, in the case of wearing, there is a demand for the size of the nostril cannula to be compact and lightweight, resulting in a contradiction between noise and ease of wearing.

Utility Model Registration No. 3107787

Utility Model Registration No. 3108599

  An object of the present invention is to provide a nostril cannula designed to suppress noise.

  Another object of the present invention is to provide a nostril cannula that is compact in overall size and that suppresses noise.

  Still another object of the present invention is to provide a nostril cannula in which the resonance point is changed to reduce noise by changing the connection length of the tube connected to the end.

  The above-described problems and other problems of the present invention will be clarified by the technical idea of the present invention described below and the embodiments thereof.

  The main idea of the present application is composed of a cylindrical body having a central portion in the length direction and a pair of end portions at both ends of the central portion, and a pair of projecting portions orthogonal to the length direction are provided in the central portion. In the nostril cannula adapted to insert the pair of protrusions into the nostril,

  The present invention relates to a nostril cannula characterized in that a tube is inserted into the end portion and the insertion depth of the tube is in the range of 4 to 8 mm from the end portion.

  Here, the outer diameter of the tube is larger than the inner diameter of the end portion, and a solvent type adhesive is applied to melt the outer peripheral surface of the tube and the inner peripheral surface of the end portion. It's okay.

  Further, by adjusting the insertion amount of the tube with respect to the end portion, the resonance point may be changed to suppress noise accompanying oxygen outflow.

  The main idea of the present application is composed of a cylindrical body having a center portion in the length direction and a pair of end portions at both ends of the center portion, and a pair of projecting portions orthogonal to the length direction are provided in the center portion. In the nostril cannula in which the pair of protruding portions are inserted into the nostrils, the tube is inserted into the end portion, and the insertion depth of the tube is in the range of 4 to 8 mm from the end portion.

  According to the nostril cannula having such a characteristic configuration, in particular, the tube insertion depth is appropriately adjusted, the resonance point is changed, and noise is reduced. This tendency is particularly noticeable in a small nostril cannula. Therefore, it is possible to provide a nostril cannula that can suppress noise while being small in size and compact.

It is the top view (A) and front view (B) of a nostril cannula. It is a front view which shows the state which has mounted | worn with a nostril cannula. It is a front view of the state which is measuring the noise of the nostril cannula of 1st Embodiment. It is the top view (A) and front view (B) of the nostril cannula of 2nd Embodiment. It is a front view of the state which is measuring the noise of the nostril cannula of 2nd Embodiment. It is a graph which shows the change of the noise with respect to oxygen flow rate. It is a graph which shows the change of the noise by the connection length of the tube with respect to an edge part.

  The present invention will be described below with reference to the illustrated embodiments. As shown in FIG. 2, the nostril cannula 11 of the present embodiment is mounted on the face of the patient so as to extend in the left-right direction at a portion immediately below the nose, and oxygen from the oxygen supply source into the nostril. Used to supply Such nostril cannula is a kind of medical device for oxygen therapy, and is widely used for oxygen therapy for hypoxic patients and the like.

  As shown in FIGS. 1A and 1B, the nostril cannula 11 includes a central portion 12 in the length direction, a pair of end portions 13 on both sides of the central portion 12, and a pair of protrusions 14 in the central portion 12. Is provided. The central portion 12 is hollow and has a flat rectangular tube shape, and the end portion 13 and the protruding portion 14 have a hollow cylindrical shape. As shown in FIG. 1A, the pair of projecting portions 14 project upward from the top surface portion of the flat rectangular tube-shaped central portion 12 perpendicularly to the top surface portion. The inside of the end portion 13 and the inside of the central portion 12 are in communication with each other, and the inside of the central portion 12 and the inside of the protruding portion 14 are also in communication with each other.

  The nostril cannula 11 is in the shape of a letter “he” when viewed from the axial direction with respect to the axial center of the protruding portion 14 at a portion between the pair of protruding portions 14 (see FIG. 1A). Further, the end portion 13 is bent with respect to the central portion 12 in a plane including the portion between the bent portion and the end portion 13 in the central portion 12 and the axis of the projecting portion 14 in this portion. (See FIG. 1B). The nostril cannula 11 is formed of a soft transparent or nearly translucent synthetic resin or synthetic rubber such as polyvinyl chloride or a styrene elastomer added with a plasticizer. If it is transparent, it will not stand out. Further, the outer and inner surfaces of the nostril cannula 11 have a surface roughness of about 0.8.

  As shown in FIG. 3, one end of the cylindrical tube 15 is inserted and fixed to each of the pair of ends 13 of the nostril cannula 11, and the ends of the pair of tubes 15 are connected to each other as shown in FIG. The tube 15 is inserted and fixed to the connecting pipe 17 in a state of being collected by a stopper ring 16 that can slide, and the other end of the tube 18 is connected to an oxygen generator or the like via a socket (not shown). Connected. The cylindrical tube 15 is a general-purpose product, and the pair of end portions 13 of the nostril cannula 11 are similarly cylindrical so that the cylindrical tube 15 can be inserted and fixed.

  Here, the tube 15 has an inner diameter of 2.3 mm and an outer diameter of 3.4 mm. On the other hand, the end 13 of the cannula 11 has a value of an inner diameter of 3.1 mm and an outer diameter of 4.5 mm. Thus, since the outer diameter of the tube 15 is larger than the inner diameter of the end portion 13 of the cannula 11, the solvent type of the tube 15 is inserted into the end portion 13 of the cannula 11. For example, the adhesive is inserted in a state of being applied to the outer peripheral portion of the tube 15, whereby the tube 15 and the inner peripheral portion of the end portion 13 are welded while being melted together.

  When the nostril cannula 11 is used for respiratory therapy for a hypoxic patient, as shown in FIG. 2, a pair of protrusions 14 are inserted into the patient's nostril so that the nostril cannula 11 extends along the lower part of the nose. Make it. Then, the position of the stopper ring 16 on the tube 15 is adjusted by putting the pair of tubes 15 on both ears and sliding the stopper ring 16 on the tubes 15. This adjustment prevents the tube 15 from moving or swinging relative to the head, thereby fixing the position of the nostril cannula 11 relative to the face.

  As described above, since the nostril cannula 11 has the shape of “F”, the nostril cannula 11 can be easily placed along the upper jaw when worn on the patient. Further, since the end portion 13 is bent with respect to the central portion 12 as described above, the tube 15 inserted and fixed to the end portion 13 can be easily extended toward the ear. In such a wearing state, oxygen generated by the oxygen generator or the like is passed through the tube 18, the connecting tube 17, the tube 15, the end portion 13 and the central portion 12 of the nostril cannula 11, and the patient's nostril. Oxygen therapy is performed.

  Next, the nostril cannula 21 according to the second embodiment will be described with reference to FIGS. As shown in FIGS. 4A and 4B, the nostril cannula 21 of the present embodiment is made of a soft transparent or nearly transparent translucent synthetic resin or synthetic rubber such as vinyl chloride or styrene elastomer, and has a length. A central portion 22 in the direction and a pair of end portions 23 are provided in the nostril cannula 21.

  The center part 22 has a pair of cylindrical protrusions 24 inserted into the nostrils, and the inside of the center part 22 and the inside of the protrusion part 24 communicate with each other. When viewed from the axial direction of the protruding portion 24, the central portion 22 is bent at an obtuse angle of about 135 ° at a portion between the pair of protruding portions 24. Therefore, the entire nostril cannula 21 It has a letter shape (see FIG. 4A).

  And as FIG. 4B shows, the part from the said obtuse angle bending part in the center part 22 to the boundary part with the edge part 23 is substantially linear form. However, the end portion 23 is inclined with respect to the central portion 22 from the extending direction of the central portion 22 toward the end portion 23 from the central portion 22 toward the side where the protruding portion 24 protrudes from the central portion 22 (see FIG. 4B). The end 23 is cylindrical because one end of a substantially cylindrical tube is inserted and fixed, while the central portion 22 is rectangular. The shape of the cross section perpendicular to the extending direction of the central portion 22 is a rectangle having a long side extending in the axial direction of the protruding portion 24 and a short side extending in a direction perpendicular to the long side.

  The length of the long side of the rectangle, which is the cross section of the central portion 22, is equal to each other in the vicinity of the protruding portion 24 and the adjacent portion 26 of the end portion 23. However, the length of the short side of the rectangle which is the cross section of the central portion is longer in the vicinity portion 25 than in the adjacent portion 26 (see FIG. 4A). This is because the projecting portion 24 is provided in a rectangular short side portion which is a cross section of the vicinity portion 25. Further, the diameter of the end portion 23 is substantially equal to the length of the short side of the rectangle which is the cross section of the vicinity portion 25. This is because one end of a general-purpose cylindrical tube 15 is inserted and fixed to the end 23 as shown in FIG.

  The length of the short side of the rectangle which is a cross section of the central portion 22 is shorter in the adjacent portion 26 than in the neighboring portion 25, but as shown in FIG. The corner-side plane 27 is flush with the neighboring portion 25 and the adjacent portion 26. For this reason, the length of the short side of the rectangle, which is a cross section of the central portion 22, is shorter in the adjacent portion 26 than in the neighboring portion 25. It is formed by steps.

  As described above, the length of the short side of the rectangle which is the cross section of the central portion 22 is shorter at the adjacent portion 26 than at the adjacent portion 25, so that the thickness of the adjacent portion 26 in the direction perpendicular to the plane 27 is It can be said that it is thinner than the thickness of the part 23. For this reason, the nostril cannula 21 is easily bent in a plane perpendicular to the axis of the protrusion 24 at the adjacent portion 26, and can be mounted along the face.

  When the nostril cannula 21 is attached to the human head, a pair of protrusions 24 are inserted into the nostril and the nostril cannula 21 is positioned from the upper jaw to the lower side of the cheekbone, as in the first embodiment. As in the case of 2, the position of the nostril cannula 21 with respect to the face is fixed by hanging a pair of tubes 15 on both ears and adjusting the position of the stopper ring 16 to prevent the tube 15 from moving or swinging with respect to the face. . When the nostril cannula 21 is attached to a human head, at least the flat surface 27 contacts the face in the nostril cannula 21, so that at least the flat surface 27 is a contact surface with the face.

  On the other hand, the face is a curved surface, and there are individual differences in the curved surface of the face. However, as described above, the nostril cannula 21 tends to bend in a plane perpendicular to the axis of the protrusion 24 at the adjacent portion 26 thereof. For this reason, the adjacent portion 26 is easily bent along the face when worn on the human head, and the flat surfaces 27 and 28 are actually curved in the worn state. Therefore, the nostril cannula 21 is easy to adjust to the face, and the fit in the wearing state on the human head is good. Moreover, since at least the flat surface 27 is a contact surface with the face as described above, the nostril cannula 21 and the face are in surface contact, and the nostril cannula 21 is more easily adapted to the face, to the human head. The feeling of fit in the wearing state becomes even better.

  In the second embodiment, the tube 15 has an inner diameter of 2.3 mm and an outer diameter of 3.4 mm. The end 23 of the cannula 21 has an inner diameter of 3.1 mm and an outer diameter of 4.5 mm. That is, the dimensions of the tube 15 and the end 23 are the same values as in the first embodiment.

  Next, the measurement results of the noise of the nostril cannula 11 and 21 will be described. FIG. 6 shows the noise level of the nostril cannula 11, 21 when the flow rate of oxygen supplied through the nostril cannula 11, 21 is changed with the tube 15 connected as shown in FIG. 3 or FIG. ing. These noise levels are measured by a sound level meter 31 shown in FIGS. 3 and 5, and a sound collecting microphone 32 is connected to the front end portion of the sound level meter 31. Measurement is performed in a state in which 32 faces the projecting portions 14 and 24 of the central portions 12 and 22.

  In FIG. 6, noise data indicated by black circles is the nostril cannula 11 shown in FIG. 1 and the nostril cannula 21 shown in FIG. 4, and the connection length to the ends 13 and 23 of the tube 15 is 6 mm. This type of nostril cannula 11, 21 has the lowest noise level, and the value when the oxygen flow rate is 7 L / min is 45.2 dBA. On the other hand, in the case of the conventional form when the connection length of the tube 15 is 10 mm in the nostril cannula 11 and 21 shown in FIG. 1 and FIG. 4, the value is indicated by a rhombus mark. The noise level is higher than that indicated by the black circle. In addition, the noise level of the commercially available competitors indicated by white circles is higher than that.

  Next, FIG. 7 shows the measurement results of the relationship between the insertion depth (connection length) of the tube 15 with respect to the end portions 23 of the nostril cannulas 11 and 21 and the noise. In this measurement, the insertion depth of the tube 15 is measured with reference to the midpoint of the oblique surfaces of the end portions 13 and 23, and the length indicated by L in FIGS. 3 and 5 is the connection length. Yes.

  According to the measurement, the level of noise hardly changes when the connection length of the tube 15 is in the range of 2 to 8 mm. On the other hand, it has been found that the noise level increases when the connection length of the tube 15 exceeds 8 mm. Therefore, in order to reduce the generation of noise accompanying oxygen outflow, the tube connection length is preferably 8 mm or less, more preferably 7 mm or less. Moreover, when the connection length of the tube 15 is too short, the tube 15 is not reliably connected to the end portions 13 and 23, and the connection strength is impaired. Therefore, the connection length needs to be at least about 4 mm. Therefore, the range of 4 to 8 mm is preferable as the connection length. More preferably, it exists in the range of 5-7 mm. If the connection length is longer than 8 mm, the noise level increases rapidly, and if it is 4 mm or less, sufficient connection strength cannot be secured.

  The above noise is presumed to be generated by a whistle-like mechanism in the process of oxygen flowing inside the cannulas 11 and 21, and especially when the flow rate of oxygen is increased, the sound of the whistle is "pea". Sounds. Here, changing the connection length of the tube 15 is considered to change the resonance point in the same manner as changing the pitch of the wind instrument. The resonance point is shifted and the sound is reduced when the connection length L of the tube 15 is around 6 mm. Therefore, the nostril cannula 11 and 21 with less noise can be provided by setting within the above range. In the first and second embodiments, manufacturing management is performed with a connection length of 6 ± 1 mm.

  When viewed from the overall shape of the nostril cannula 11, 21, the larger one is less likely to generate noise, and the smaller one is more likely to generate noise. On the other hand, considering the ease and lightness of wearing or the burden on the face, a smaller nostril cannula is preferable. However, when the size is reduced, noise is likely to be generated. Therefore, the present invention is extremely effective particularly in a nostril cannula designed to be small and light, and when further noise reduction is required.

  While the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical idea of the present invention. For example, various changes can be made in accordance with the purpose of the overall shape of the nostril cannula 11, 21 and the dimensions or materials of each part.

  The present invention can be used as a nostril cannula used for respiratory therapy for patients with hypoxia or the like who need inhalation of oxygen.

DESCRIPTION OF SYMBOLS 11 Nostril cannula 12 Center part 13 End part 14 Projection part 15 Tube 16 Stopper ring 17 Connection pipe 18 Tube 21 Nostril cannula 22 Center part 23 End part 24 Projection part 25 Neighboring part 26 Adjacent part 27, 28 Plane 31 Sound level meter 32 Sound collection Microphone

Claims (3)

A pair of projecting portions each including a center portion in the length direction and a pair of end portions at both ends of the center portion, the pair of projecting portions orthogonal to the length direction being provided at the center portion, and the pair of projecting portions. In the nostril cannula that is designed to be inserted into the nostril,
A nostril cannula characterized in that a tube is inserted into the end portion and the insertion depth of the tube is within a range of 4 to 8 mm from the end portion.   The outer diameter of the tube is larger than the inner diameter of the end portion, and a solvent type adhesive is applied to weld the outer peripheral surface of the tube and the inner peripheral surface of the end portion. The nostril cannula according to claim 1.   The nostril cannula according to claim 1, wherein a resonance point is changed by adjusting an insertion amount of the tube with respect to an end portion to suppress noise accompanying outflow of oxygen.

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