Nasal cannula for post-aural surgery

Abstract

The application discloses a nasal catheter for post-ear operation, and belongs to the technical field of oxygen inhalation devices. The root of a nasal plug body is pre-connected with a unilateral flexible foam adhesive base through a position adjusting tongue. The back of the base is provided with a guide frame and a lockable pressing plate. The position adjusting tongue slides along the guide frame. The locking teeth of the lockable pressing plate are opposite to the positioning tooth array of the position adjusting tongue. The pressing plate is kept engaged by a buckle and a buckle shoulder after being pressed down. The release paper covering the adhesive layer of the base extends to form a release strip. The thickened support section of the release strip is inserted between the pressing plate and the guide frame to limit the pressing plate from being locked too early. When the release paper is removed, the thickened support section is driven out, so that the nasal plug body and the base can be relatively positioned. When the base is pressed against the cheek, the pressing plate is synchronously pressed to lock. The locking structure acts on the entity position adjusting tongue outside the air path. The nasal catheter realizes the non-ear hanging fixation of a post-ear operation patient through cooperation of film peeling, sliding alignment and pressing and locking.

Description

Technical Field

[0001] This invention relates to the field of oxygen inhalation equipment and skin adhesive fixation technology, specifically to a non-ear-hook nasal cannula that has a small foam pad pre-connected to the base of the nasal plug and achieves relative position adjustment and mechanical locking through peeling and pressing actions. Background Technology

[0002] Common nasal cannulas place two nasal branchlets at the nostril inlet, with the oxygen delivery tube running from both sides of the face around the auricle and held in place by a sliding sleeve at the chin. Post-ear surgery patients may have incisions, dressings, and bandages in the auricle or behind the ear area, making it easy for the tube to come into contact with these areas, thus limiting fixation and dressing changes. Therefore, placing an adhesive base on the cheek next to the nasal ala provides an alternative fixation position for patients who cannot have their ears hung.

[0003] There are existing disclosures regarding the relative position adjustment of the cheek adhesive and the nasal cannula. For example, US20020157673A1 discloses a nasal cannula retainer with a facial adhesive portion; CN109675166B discloses a nasal cannula assembly and related components, the description of which describes a toothed adjustment connection between the side and the adhesive pad. Therefore, simply arranging the patch, nasal plug, and adjustable connector side-by-side does not solve the operational coordination problem of these structures on a small, integrated adhesive base.

[0004] When the nasal plug has a foam base of approximately 20 mm x 12 mm directly attached to its base, although the base area is small, different users have different nasal wing heights, nasolabial fold depths, and facial contours. If the distance between the nasal plug and the base is completely fixed, the user may have to pull on the nasal plug, stretch the patch, or move the branch tube at the nostril entrance to achieve a forced fit, resulting in initial misalignment. If the base is attached first and then the nasal plug is located, it may be necessary to remove the base and reattach it.

[0005] When using a sliding connector, locking it in advance requires an additional unlocking operation, and failing to lock it after application may cause the nasal plug to shift. When using a one-way ratchet that is always engaged, retraction requires prying open the latch. The small mounting base has limited space for holding and setting mechanisms, so the adjustment and application actions need to be coordinated. Summary of the Invention

[0006] The present invention aims to enable bidirectional adjustment of small, non-ear-loop nasal cannulas before application, to securely lock them in place upon application, and to prevent premature locking before the film is removed.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: A nasal cannula for use after ear surgery includes a nasal plug, an oxygen delivery tube communicating with the nasal plug, and a flexible foam adhesive base located on one side of the nasal plug. The skin-contact side of the flexible foam adhesive base has an adhesive layer. The cannula is characterized in that: a guide frame is fixed to the skin-repellent side of the flexible foam adhesive base; an adjustment tongue is fixedly connected to the root of the nasal plug; the adjustment tongue is confined and held within a guide groove of the guide frame and is capable of sliding relative to it in directions toward and away from the nasal ala; a locking plate is connected to the guide frame via an elastic connecting arm; the locking plate has locking teeth on the side facing the adjustment tongue; and the adjustment tongue has positioning teeth opposite to the locking teeth. The elastic connecting arm separates the locking teeth from the positioning teeth when not pressed; the locking plate and the guide frame are respectively provided with hooks and shoulders that can be engaged after the locking plate is pressed down, so that the locking teeth remain engaged with the positioning teeth; the adhesive layer is covered with release paper, the release paper includes a covering section covering the adhesive layer and a pull-out strip connected to the covering section, the thickened support section of the pull-out strip is removably placed between the support platform of the guide frame and the pressure foot of the locking plate, so as to restrict the locking plate from being pressed down to the engaging position when the covering section is not removed, and to exit with the pull-out strip when the covering section is removed.

[0008] Furthermore, the thickened support section is located outside the sliding range of the adjusting tongue, and the guide frame has a pull-out port on the side away from the nose wing for the pull-out strip and the thickened support section to pass through. After the thickened support section is pulled out, a travel space is formed between the support platform and the pressure foot for the locking pressure plate to press down.

[0009] Furthermore, the end of the covering section near the nose wing is provided with a film peeling handle, and the other end of the covering section bypasses the edge of the flexible foam adhesive base away from the nose wing and is continuously connected to the extraction strip. The thickened support section is formed by folding and thickening the end of the extraction strip.

[0010] Furthermore, the locking tooth and the positioning tooth row are symmetrical tooth shapes with two oppositely arranged bearing tooth surfaces. The positioning tooth row is arranged along the sliding direction of the adjusting tongue. After the locking tooth engages with the positioning tooth row, it restricts the bidirectional sliding of the adjusting tongue.

[0011] Furthermore, the guide frame is provided with a closing stop that cooperates with the locking pressure plate, and the closing stop limits the engagement depth of the locking teeth; the engagement position of the hook and the buckle corresponds to the position where the locking teeth have entered the inter-tooth position of the positioning tooth row, and the retraction gap after engagement is less than the effective engagement depth of the locking teeth.

[0012] Furthermore, the two sides of the adjusting tongue are restricted by the groove lip of the guide groove to detach in a direction away from the skin, and the end of the adjusting tongue has an anti-detachment head. The anti-detachment head cooperates with the travel shoulder of the guide frame to limit the sliding travel of the adjusting tongue and prevent it from exiting from the nose side opening of the guide groove.

[0013] Furthermore, the adjusting tongue is fixedly connected to the outer wall of the nasal plug branch root of the nasal plug body via a flexible thin neck. The flexible thin neck does not contain an air supply channel, and the minimum thickness of the flexible thin neck is less than the thickness of the portion of the adjusting tongue that supports the positioning teeth.

[0014] Furthermore, the guide frame, the locking plate, and the elastic connecting arm are components of the same polymer molded part, and at least two sets of the elastic connecting arms are distributed on opposite sides of the locking plate, with the pressing surface of the locking plate located above the attachment area of ​​the flexible foam adhesive base.

[0015] Furthermore, the flexible foam adhesive base has a length of 18-22 mm and a width of 10-14 mm, and the outer contour of the guide frame is located within the outer contour of the flexible foam adhesive base; the total sliding stroke of the adjusting tongue is 2-4 mm, and the tooth pitch of the positioning tooth row is 0.4-0.8 mm.

[0016] Furthermore, the flexible foam adhesive base is a rounded foam sheet with a length of 20 mm and a width of 12 mm. It has a nasal wing avoidance opening on the edge facing the nasal wing and a peel-off ear without the adhesive layer on the corner away from the nasal wing. The oxygen delivery tube is connected to the lower side of the nasal plug and extends out to the front and lower part of the face.

[0017] The beneficial effects of this invention are as follows: When the release liner covers the adhesive surface, the thickened support section simultaneously restricts premature engagement; after the release liner is removed, the pressure plate remains raised, allowing for bidirectional adjustment; during application, the locking teeth and mechanical engagement jointly determine the position of the nose plug relative to the mounting base. These three states are formed by the spatial coordination between the release liner, pressure plate, and guide frame, reducing independent disassembly and locking operations.

[0018] The nasal plug and cheek attachment positions can be aligned separately before bonding, which helps reduce initial traction caused by improper fixing distance. The locking action is applied to the physical adjustment tongue, avoiding the need to flatten the oxygen tubing to achieve retention force. The locked position does not rely on continuous pressure from the user or prolonged pressure on the foam to maintain the teeth's engagement, thus preserving the foam's function as a skin-friendly cushioning layer. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the nasal cannula before the release paper is removed.

[0021] Figure 2 This is a schematic diagram showing the positional relationship of the adjusting tongue, guide frame, and extraction strip after the locking pressure plate is partially removed.

[0022] Figure 3 This is a schematic diagram of the longitudinal structure of the thickened support section in the support position. The elastic connecting arm and its root are shown in projection.

[0023] Figure 4 This is a schematic diagram of the longitudinal structure where the adjusting tongue is in an adjustable state after the release paper and thickened support section are pulled out.

[0024] Figure 5 This is a schematic diagram of the longitudinal structure in which the positioning teeth are locked after the locking plate is pressed down and engaged.

[0025] Figure 6 This is a diagram illustrating the placement of a nasal cannula on the cheek next to the nostril.

[0026] In the diagram: 1-Nasal plug body; 11-Air supply chamber; 12-Nasal plug branch tube; 2-Oxygen delivery tube; 21-Oxygen supply connector; 3-Flexible foam adhesive base; 31-Adhesive layer; 32-Nose wing clearance opening; 33-Removal ear; 4-Guide frame; 41-Guide groove; 42-Support platform; 43-Shoulder; 44-Stroke shoulder; 45-Closing stop; 5-Adjusting tongue; 51-Positioning teeth; 52-Anti-detachment head; 53-Flexible thin neck; 6-Locking pressure plate; 61-Locking teeth; 62-Elastic connecting arm; 63-Hook; 64-Pressure foot; 7-Release paper; 71-Covering section; 72-Removal handle; 73-Extraction strip; 74-Thickened support section. Detailed Implementation

[0027] The following description, in conjunction with the accompanying drawings, illustrates the implementation method. The tooth shape, layer thickness, and gaps in the drawings are enlarged representations and are not intended as a manufacturing scale. The direction towards the nose wing is called the nasal side, and the opposite direction is called the outer side; the direction towards the skin is called the skin-adhesive direction, and the opposite direction is called the back-skin direction. The nose plug base is integrally equipped with a mounting base, indicating that it is pre-connected as a complete component at the factory to prevent detachment, and it is not required that the foam and air circuit be molded from the same material in a single step.

[0028] Example 1

[0029] refer to Figure 1-6 As shown, a single-sided foam pad is used. The nasal plug body 1 is a flexible body with two nasal plug branches 12, both of which are connected to the internal air supply chamber 11. The branch openings and contact edges are smoothly transitioned. The oxygen supply tube 2 enters the air supply chamber 11 from the lower side of the nasal plug body 1 and extends along the lower front of the face to the oxygen supply connector 21. The oxygen supply line does not pass through the inside of the guide frame 4 and does not form a detachable airway connector at the toothed part of the adjusting tongue 5.

[0030] The flexible foam adhesive base 3 is 20 mm long, 12 mm wide, and can be 1.0 mm thick. A medical-grade pressure-sensitive adhesive layer 31 is applied to the skin-contact side of the foam pad, while the skin-repellent side is fixedly bonded to the bottom surface of the guide frame 4. The guide frame 4 can be 16 mm long and 8 mm wide, with foam margins around its edges. The bottom of the guide frame 4 continuously covers the area containing its internal mechanism, maintaining two layers of isolation between the moving parts and the skin: the frame bottom and the foam.

[0031] The guide groove 41 extends from the nasal side to the outer side, and the adjusting tongue 5 has a toothed segment that moves within the groove and a root that connects to the nasal plug body 1. The two side lips of the guide groove 41 cover the corresponding side edges of the adjusting tongue 5, restricting the adjusting tongue 5 from dislodging towards the back of the skin. The bottom of the groove bears the reaction force when the locking teeth 61 are pressed, and thus this reaction force is transmitted to the foam through the guide frame 4, preventing the adjusting tongue 5 from being directly pressed onto the skin by the pressure plate 6.

[0032] The adjusting tongue 5 has a widened anti-slip head 52 at its end, and a travel shoulder 44 is formed at the nose-side opening of the guide groove 41. During assembly, the elastic clearance at the opening allows the anti-slip head 52 to enter the groove, and after entering, the shoulder 44 prevents it from reversing; the distal end wall of the groove restricts movement in the other direction. The anti-slip head 52 is located in the corresponding travel cavity, and the length of the travel cavity is greater than the length of the anti-slip head 52 along the sliding direction. The difference between the two constitutes the allowable total adjusting stroke.

[0033] The positioning tooth row 51 is located on the back surface of the adjusting tongue 5, employing a symmetrical tooth profile that repeats along the sliding direction, with the lateral extension direction of the teeth intersecting the sliding direction. The tooth spacing can be 0.5 mm, the tooth height can be 0.2 mm, and the tooth tip and root have small rounded corners. The locking tooth 61 is located on the lower surface of the pressure plate 6, and can be provided with two to three consecutive teeth that engage with the positioning tooth row 51. The two bearing tooth surfaces of the corresponding teeth respectively constrain the adjusting tongue 5 to move towards the nose and outward.

[0034] The locking pressure plate 6 is located on the central skin-facing side of the guide frame 4, with a large, flat pressing surface within the foam attachment area. Two or four sets of elastic connecting arms 62 connect the pressure plate 6 to both sides of the guide frame 4. The connecting arms 62 can be in the shape of folded-back sheets. Symmetrical arrangement guides the pressure plate 6 to descend primarily along the skin-facing direction, reducing the additional lateral displacement exerted on the adjusting tongue 5 during its descent. The raised state of the pressure plate 6 is maintained by the elastic shape of the connecting arms 62.

[0035] Hooks 63 are provided on the outer side or opposite sides of the pressure plate 6, and corresponding shoulders 43 are formed in the guide frame 4. The hooks 63 have a downward guiding slope and a retaining surface. When descending, the elasticity allows them to pass over the shoulders 43, and the retaining surface enters below the shoulders. The retraction gap after engagement is less than the effective engagement depth of the locking teeth 61, so that even if the connecting arm 62 causes the pressure plate to rebound slightly after the external pressing pressure is removed, the locking teeth still remain engaged in the tooth row 51.

[0036] The closing stop 45 is located on the guide frame 4 and abuts against the non-toothed portion of the pressure plate 6. The closing stop 45 should allow the locking teeth 61 to fully engage between the teeth while preventing the pressure plate 6 from continuing to descend and excessively squeezing the adjusting tongue 5. If tooth tip to tooth tip occurs during the initial downward press, the rounded corners and guide bevel allow the adjusting tongue 5 to move slightly to the adjacent tooth position; only after the teeth have entered the engagement depth will the hook 63 reach the holding position of the hook shoulder 43, thereby reducing the situation where the hook engages before it is fully engaged.

[0037] In this embodiment, the release paper 7 is a polyester-based composite sheet with a release surface. The cover section 71 is laid on the adhesive layer 31, and the nose-side end extends to form a peeling handle 72. The outer end of the cover section 71 wraps around the outer edge of the foam sheet, narrows into a pull-out strip 73, and is inserted into the pull-out port outside the guide frame 4. The pull-out strip 73 does not enter the air passage, and its end is folded and fixed to form a thickened support section 74. The folded layers can be heat-sealed to prevent unfolding or leaving loose fragments during the extraction process.

[0038] The thickened support section 74 is located on the support platform 42 outside the travel cavity of the adjusting tongue 5, and its upper part corresponds to the pressure foot 64 of the pressure plate 6. The pressure foot 64 is a solid protrusion on the lower surface of the pressure plate 6, and the support platform 42 is the fixed platform of the guide frame 4. Together with the thickened support section 74, they form a temporary support path independent of the adjusting tongue 5, so when the extraction bar 73 is pulled out, it will not clamp the positioning teeth 51, nor will it drive the nose plug body 1 to move through the teeth.

[0039] The clearances of each part can be determined according to the following set of structural design values: When the pressure plate 6 is raised, the vertical clearance between the pressure foot 64 and the support platform 42 is 0.70 mm, and the effective thickness of the thickened support section 74 is 0.60 mm; the clearance between the tip of the locking tooth 61 and the top of the positioning tooth row 51 is 0.30 mm; the downward stroke from the raised position to the engaged position is 0.50 mm. When the thickened support section 74 is present, the pressure foot 64 will only drop by about 0.10 mm at most before being supported, which is not enough to make the locking tooth contact or the hook engage.

[0040] After the support section 74 is withdrawn, the bearing foot 64 descends by 0.50 mm, still maintaining a distance of approximately 0.20 mm from the support platform 42. The final stroke is determined by the closing stop 45 to prevent the support platform itself from blocking the locking position. The above are design dimensions; tolerances must take into account the deformation of the support section, forming shrinkage, and tooth height deviation.

[0041] The total adjustment stroke can be 3 mm. The positioning tooth row 51 covers this stroke and the effective length of the locking tooth 61, ensuring that the adjustment tongue 5 has teeth available for engagement in any permissible position. The anti-disengagement head 52 at the distal end of the toothed section does not enter the space where the support platform 42 is located even at the maximum insertion position. The height of the extraction port is greater than the thickness of the thickened support section 74 and retains an extraction gap. Its edges are rounded to allow the support section to pass through completely.

[0042] like Figure 3 As shown, in the packaged state, the covering section 71 protects the adhesive layer 31, and the thickened support section 74 restricts the movement of the pressure plate 6 to the snap-fit ​​position. This support is designed for the intended storage and transportation load, and the packaging still needs to reserve protective space for the nasal plug tube and the pressure plate.

[0043] When using, pinch the peeling handle 72 and peel off the cover section 71 from the nose side to the outside. As the cover section 71 gradually detaches from the adhesive surface, continue pulling, and the release strip 73 connected to it will retract from the outer extraction port, causing the thickened support section 74 to leave the support platform 42. The release paper 7 and the thickened support section 74 are removed as a connected unit, without the need to remove a separate safety device. The connection position and folding direction of the release strip should ensure that the final pulling force acts primarily along the extraction port direction.

[0044] like Figure 4 As shown, when the release paper 7 is removed without pressing the pressure plate 6, the connecting arm 62 remains separated from the locking teeth 61 and the positioning teeth 51. The user holds the nasal plug branch 12 aligned with the nasal inlet with one hand, and grasps the flexible edge of the base 3 with the other, moving it towards the appropriate skin area beside the nose without pressing down the pressure plate 6. The adjusting tongue 5 slides relative to the guide groove 41, allowing for small-scale bidirectional alignment of a fixed distance.

[0045] like Figure 5 and Figure 6 As shown, after the position is determined, press the pressing surface of the locking plate 6 to make the foam base 3 adhere to the cheek. At the same time, the pressing plate 6 descends, the locking teeth 61 enter the tooth row 51, and the hook 63 engages with the shoulder 43. Then, gently press along the remaining edge of the foam to complete the edge adhesion. The pressing surface, the bottom surface of the guide frame, and the foam attachment area correspond vertically, so that the pressing action of the fixing sticker directly drives the mechanical locking, without the need for further tightening or separate tightening of a strap.

[0046] A flexible thin neck 53 connects the outer wall of the nose plug body 1 to the toothed section of the adjusting tongue 5. The nose plug body 1 and the thin neck 53 can be molded from silicone rubber or a suitable thermoplastic elastomer. The toothed section of the adjusting tongue 5 can be made of a high-rigidity polymer insert, which is fixed to the thin neck 53 by overmolding. The thin neck 53 can be 0.6 mm thick, 3 mm wide, and 4 mm long, while the toothed section body can be 0.9 mm thick, so that the angular conformal mainly occurs in the thin neck 53 rather than at the meshing part of the teeth.

[0047] The thin neck 53 is used for small-angle conformal adjustment after locking, without replacing the adjustment stroke by lengthening the thin neck. The external pipeline retains a flexible length to avoid tension; this structure does not isolate all external tension.

[0048] The foam base 3 forms a nasal abutment 32 on the side facing the nasal wing. The abutment 32 allows space between the edge of the foam pad and the outer edge of the nasal wing, and is not used to clamp the nasal wing. The nasal side opening of the guide groove 41 can face the abutment 32, and the thin neck 53 extends above it. The removal ear 33 is located in a corner away from the nasal wing, where no skin adhesive is provided, so that the patch can be slowly peeled off from the edge after use without removing the patch by pulling on the nasal plug or oxygen tube.

[0049] The hook 63 is retracted within the contour of the guide frame 4. This embodiment is designed for one-time attachment and locking, without a repeatedly unlocking lever. When the fixing position needs to be reprocessed, the component should be replaced or removed according to product requirements.

[0050] Example 2

[0051] Mirror the guide frame 4, the adjusting tongue 5, and the foam base 3 to create a configuration suitable for the other cheek. The film-removing handle 72 remains near the nose wing, and the extraction port still faces outwards, maintaining the directional relationship between film removal and extraction. Adjustment does not require opening the air passage.

[0052] The foam pad can be 18–22 mm long, 10–14 mm wide, and 0.8–1.5 mm thick; the total adjustment stroke can be 2–4 mm, and the positioning tooth pitch can be 0.4–0.8 mm. For different specifications, the internal stroke cavity of the guide frame, the coverage length of the positioning tooth row, and the temporary support space should be determined simultaneously to ensure that the thickened support section 74 is always outside the movement range of the adjustment tongue 5. If the target surface shape exceeds the fine-tuning range, the corresponding specification should be selected, rather than relying on the patch to forcibly compensate across the nose wing.

[0053] The guide frame 4, the flexible connecting arm 62, and the locking plate 6 can be made of polypropylene integral injection molding suitable for flexible hinge structures, with a rounded transition between the connecting arm 62 and the frame. After the adjusting tongue 5 is inserted into the guide groove 41 and the anti-detachment connection is completed, the guide frame 4 is then laminated with the foam base 3. Finally, the release paper 7 is installed, the thickened support section 74 is inserted into the designated support position along the pull-out port, and the covering section 71 completely covers the adhesive layer 31.

[0054] The thickened support section 74 can be formed by stacking four layers of 0.15 mm thick extraction strip ends and fixing them to form a thickness of about 0.60 mm; or it can be a support sheet of equal thickness fixedly connected to the extraction strip, so that it is withdrawn as a whole with the release paper and leaves no residue.

[0055] Assembly checks should cover three states: when the cover section 71 is not removed, the pressure plate 6 should not engage prematurely under the predetermined packaging compression conditions; when the support section 74 is pulled out and not pressed, the adjusting tongue 5 should move bidirectionally within a limited stroke without disengaging; after pressing is completed, the pressure plate 6 should be held in place by the hook, and the toothed row should restrict bidirectional displacement. Additionally, the integrity of the extraction strip, its closure when the tooth tips are aligned, the air passage seal, and the ventilation after bending should be checked.

[0056] The prototype can be compared with a fixed-distance structure with the same nasal plug and patch area to determine initial nasal plug offset and number of repeated application / removal cycles, and with a structure without support sections to determine premature fastening after packaging compression. The above is a validation protocol and does not represent experimental or clinical results.

[0057] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A nasal cannula for use after ear surgery, comprising a nasal plug (1), an oxygen delivery tube (2) communicating with the nasal plug (1), and a flexible foam adhesive base (3) located on one side of the nasal plug (1), wherein the skin-contact side of the flexible foam adhesive base (3) has an adhesive layer (31), characterized in that: A guide frame (4) is fixed to the back side of the flexible foam adhesive base (3), and an adjustment tongue (5) is fixedly connected to the root of the nose plug (1). The adjustment tongue (5) is limited and held in the guide groove (41) of the guide frame (4) and can slide relative to the nose in the direction towards and away from the nostrils. The guide frame (4) is connected to a locking plate (6) through an elastic connecting arm (62). The locking plate (6) has locking teeth (61) on the side facing the adjustment tongue (5). The adjustment tongue (5) has a positioning tooth row (51) opposite to the locking teeth (61). The elastic connecting arm (62) separates the locking teeth (61) from the positioning tooth row (51) when not pressed. The locking plate (6) and the guide frame (4) are respectively The device is provided with a hook (63) and a shoulder (43) that can be engaged after the locking plate (6) is pressed down, so that the locking teeth (61) are engaged with the positioning teeth (51); the adhesive layer (31) is covered with release paper (7), the release paper (7) includes a covering section (71) covering the adhesive layer (31) and a pull-out strip (73) connected to the covering section (71), the thickened support section (74) of the pull-out strip (73) is removably placed between the support platform (42) of the guide frame (4) and the pressure foot (64) of the locking plate (6), so as to restrict the locking plate (6) from being pressed down to the engaging position when the covering section (71) is not removed, and to be removed with the pull-out strip (73) when the covering section (71) is removed.

2. The nasal cannula for ear surgery according to claim 1, characterized in that, The thickened support section (74) is located outside the sliding range of the adjusting tongue (5). The guide frame (4) has a pull-out port on the side away from the nose wing for the pull-out strip (73) and the thickened support section (74) to pass through. After the thickened support section (74) is pulled out, a travel space is formed between the support platform (42) and the pressure foot (64) for the locking pressure plate (6) to press down.

3. The nasal cannula for ear surgery according to claim 2, characterized in that, The covering section (71) has a film-removing handle (72) at one end near the nose wing. The other end of the covering section (71) goes around the edge of the flexible foam adhesive base (3) away from the nose wing and is continuously connected to the extraction strip (73). The thickened support section (74) is formed by folding and thickening the end of the extraction strip (73).

4. The nasal cannula for ear surgery according to claim 1, characterized in that, The locking tooth (61) and the positioning tooth row (51) are symmetrical tooth shapes with two oppositely arranged bearing tooth surfaces. The positioning tooth row (51) is arranged along the sliding direction of the adjusting tongue (5). After the locking tooth (61) meshes with the positioning tooth row (51), it restricts the bidirectional sliding of the adjusting tongue (5).

5. The nasal cannula for ear surgery according to claim 4, characterized in that, The guide frame (4) is provided with a closing stop (45) that cooperates with the locking plate (6). The closing stop (45) limits the engagement depth of the locking tooth (61). The engagement position of the hook (63) and the shoulder (43) corresponds to the position where the locking tooth (61) has entered the tooth space of the positioning tooth row (51), and the retraction gap after engagement is less than the effective engagement depth of the locking tooth (61).

6. The nasal cannula for ear surgery according to claim 1, characterized in that, The two sides of the adjustment tongue (5) are restricted by the groove lip of the guide groove (41) to detach in the direction away from the skin. The end of the adjustment tongue (5) has an anti-detachment head (52). The anti-detachment head (52) cooperates with the travel shoulder (44) of the guide frame (4) to limit the sliding travel of the adjustment tongue (5) and prevent it from exiting from the nose side opening of the guide groove (41).

7. The nasal cannula for ear surgery according to claim 6, characterized in that, The adjusting tongue (5) is fixedly connected to the outer wall of the root of the nasal plug branch (12) of the nasal plug body (1) by a flexible thin neck (53). The flexible thin neck (53) does not contain an air supply channel, and the minimum thickness of the flexible thin neck (53) is less than the thickness of the part of the adjusting tongue (5) that carries the positioning teeth (51).

8. The nasal cannula for ear surgery according to claim 1, characterized in that, The guide frame (4), the locking plate (6) and the elastic connecting arm (62) are components of the same polymer molded part. At least two sets of the elastic connecting arms (62) are distributed on opposite sides of the locking plate (6). The pressing surface of the locking plate (6) is located above the attachment area of ​​the flexible foam adhesive base (3).

9. The nasal cannula for ear surgery according to claim 1, characterized in that, The flexible foam adhesive base (3) has a length of 18-22 mm and a width of 10-14 mm. The outer contour of the guide frame (4) is located within the outer contour of the flexible foam adhesive base (3). The total sliding stroke of the adjusting tongue (5) is 2-4 mm, and the tooth pitch of the positioning tooth row (51) is 0.4-0.8 mm.

10. The nasal cannula for ear surgery according to claim 1, characterized in that, The flexible foam adhesive base (3) is a rounded foam sheet with a length of 20 mm and a width of 12 mm. It has a nasal wing avoidance opening (32) on the edge facing the nasal wing and a removal ear (33) that is not coated with the adhesive layer (31) on the corner away from the nasal wing. The oxygen delivery tube (2) is connected to the lower side of the nasal plug (1) and leads out to the front and lower part of the face.

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