Sphygmomanometer

Abstract

The present invention relates to the technical field of blood pressure detection instruments, and discloses a sphygmomanometer, comprising: an adapter having an inner cavity, the cavity wall of the inner cavity including a large-diameter section and a small-diameter section, the inner diameter of the large-diameter section being greater than that of the small-diameter section, and the large-diameter section being adjacent to the insertion port of the inner cavity, a first limiting step surface being formed between the large-diameter section and the small-diameter section; a tracheal head having a plug adapted to be inserted into the inner cavity, the plug being provided with a second limiting step surface adapted to abut against the first limiting step surface, and when the second limiting step surface abuts against the first limiting step surface, the tracheal head is hermetically connected to the adapter. Compared with the related art, the present invention can avoid the influence on airtightness caused by the deformation of the sealing ring due to the excessive insertion of the tracheal head into the adapter.

Description

Technical Field

[0001] The present invention relates to the technical field of blood pressure detection instruments, and particularly relates to a sphygmomanometer. Background Art

[0002] Hypertensive disease is one of the most common internal medicine diseases at present. It is very widespread, and there are many hypertensive patients from the elderly population to the young population. Hypertensive patients need to closely monitor their physical conditions and gradually treat the disease through diet and living habits. In order to better monitor the blood pressure fluctuations of patients, sphygmomanometers have gradually been applied to daily life.

[0003] A sphygmomanometer is an instrument for measuring blood pressure. Existing sphygmomanometers are divided into mercury sphygmomanometers, electronic sphygmomanometers, and spring dial sphygmomanometers. The more commonly used one is the electronic sphygmomanometer. For example, Figures 1 to 3 , in related technologies, some electronic sphygmomanometers include a cuff and an adapter. The adapter has a limiting concave platform, and a sealing ring is assembled at the limiting concave platform. The tracheal head of the cuff and the jack of the adapter are tightly fitted through the sealing ring located at the limiting concave platform. The plug of the tracheal head has a small angle. The deeper the plug is inserted into the inner cavity of the adapter, the larger the outer diameter in contact with the sealing ring. When the plug and the jack are fitted, the user cannot know the insertion depth of the plug and usually inserts it to the bottom. Inserting it to the bottom multiple times will stretch and deform the inner ring of the sealing ring, resulting in insufficient airtightness and thus inaccurate measurement. Summary of the Invention

[0004] In view of this, the present invention provides a sphygmomanometer to solve the problem that the sealing ring is deformed due to the tracheal head being excessively inserted into the adapter, which affects the airtightness.

[0005] The present invention provides a sphygmomanometer, including:

[0006] An adapter having an inner cavity, the cavity wall of the inner cavity including a large-diameter section and a small-diameter section, the inner diameter of the large-diameter section being greater than that of the small-diameter section, and the large-diameter section being adjacent to the insertion port of the inner cavity. A first limiting step surface is formed between the large-diameter section and the small-diameter section;

[0007] A tracheal head having a plug adapted to be inserted into the inner cavity. The plug is provided with a second limiting step surface adapted to abut against the first limiting step surface. When the second limiting step surface abuts against the first limiting step surface, the tracheal head is hermetically connected to the adapter.

[0008] Beneficial effects: By providing a first limiting step surface on the inner wall of the inner cavity and a second limiting step surface on the plug adapted to abut against the first limiting step surface, during the process of inserting the plug into the inner cavity of the adapter, when the second limiting step surface abuts against the first limiting step surface, the plug cannot move further inward. At this time, the tracheal head is hermetically connected to the adapter and the plug is inserted in place. Therefore, compared with the related art, it can avoid the deformation of the sealing ring caused by the over-insertion of the tracheal head into the adapter, which affects the airtightness.

[0009] In an alternative embodiment, a sealing ring is integrated outside the tracheal head, and the end face of the sealing ring close to the end of the plug constitutes the second limiting step surface.

[0010] Beneficial effects: The sealing ring is integrated outside the tracheal head. During the process of inserting the plug into the inner cavity of the adapter, when the end face of the sealing ring abuts against the first limiting step surface, the plug cannot move further inward. At this time, since the sealing ring is in sealing contact with the first limiting step surface, the tracheal head is hermetically connected to the adapter and the plug is inserted in place. Therefore, compared with the related art, it can avoid the deformation of the sealing ring caused by the over-insertion of the tracheal head into the adapter, which affects the airtightness.

[0011] In an alternative embodiment, the sealing ring and the tracheal head are integrally formed by two-shot injection molding.

[0012] Beneficial effects: The material of the sealing ring is soft rubber and it is the part molded in the first injection. The material of the tracheal head is plastic and it is the part molded in the second injection. Two-shot injection molding reduces the process and can firmly connect the sealing ring and the tracheal head into one body. The structure is simple and reliable, and the installation step of the sealing ring is omitted.

[0013] In an alternative embodiment, the outer diameter of the sealing ring is greater than the inner diameter of the large-diameter section.

[0014] Beneficial effects: The outer diameter of the sealing ring is greater than the inner diameter of the large-diameter section. During the process of inserting the plug into the inner cavity, since the outer diameter of the sealing ring is greater than the inner diameter of the large-diameter section, the sealing ring will be slightly difficult to enter the large-diameter section. However, due to the material of the sealing ring being soft rubber, the sealing ring will deform and enter the large-diameter section until the sealing ring touches the first limiting step surface. Since the diameter of the small-diameter section is smaller, the sealing ring cannot move forward further. In this way, a tight fit is formed, enabling the user to know when the insertion is completed. After the insertion is completed, it is difficult for the user to pull out the tracheal head, ensuring the airtightness and thus ensuring the accuracy of the blood pressure measurement.

[0015] In an alternative embodiment, the length of the large-diameter section is equal to the cross-sectional width of the sealing ring.

[0016] Beneficial effects: By making the length of the large-diameter section equal to the cross-sectional width of the sealing ring, the sealing ring is just stuck in the large-diameter section, without protruding outside the adapter, and the insertion difficulty of the tracheal head is also reduced.

[0017] In an alternative embodiment, the sphygmomanometer includes a base, an installation bracket for fixing the adapter is provided inside the base, an installation hole suitable for inserting the tracheal head is provided on the side wall of the base adjacent to the installation bracket, and the aperture of the installation hole is smaller than the outer diameter of the sealing ring and larger than the inner diameter of the small-diameter section.

[0018] Beneficial effects: The plug of the tracheal head has to pass through the installation hole on the side wall first. Since the aperture of the installation hole is smaller than the outer diameter of the sealing ring, the plug will become difficult to pass through the installation hole. However, since the material of the sealing ring is soft rubber, it will deform and pass through the installation hole on the side wall until the sealing ring completely passes through the installation hole. The sealing ring will recover its shape to a certain extent. After the sealing ring passes through the installation hole, it will touch the first limiting step surface. Since the diameter of the small-diameter section is smaller, the sealing ring cannot continue to move forward, thus forming a tight fit, enabling the user to know when the insertion is completed. And after the insertion is completed, restricted by the installation hole on the side wall, it is not easy for the user to pull out the tracheal head, ensuring airtightness, and further ensuring the accuracy of the blood pressure measurement.

[0019] In an alternative embodiment, the plug includes a first pipe section and a second pipe section, the outer diameter of the first pipe section is smaller than the outer diameter of the second pipe section, and a second limiting step surface is formed between the first pipe section and the second pipe section.

[0020] Beneficial effects: The outer diameter of the first pipe section is smaller than that of the second pipe section. The first pipe section can be completely inserted into the inner cavity until the second limiting step surface abuts against the first limiting step surface. Since the plug is made of plastic, it is difficult to deform. Blocked by the first limiting step surface, the plug cannot move inward any further, completing the insertion. Compared with the related technology, it can avoid the influence on airtightness caused by the deformation of the sealing ring due to the excessive insertion of the tracheal head into the adapter.

[0021] In an alternative embodiment, a sealing ring is provided between the second pipe section and the wall of the inner cavity.

[0022] Beneficial effects: By providing a sealing ring between the second pipe section and the wall of the inner cavity, when the second limiting step surface abuts against the first limiting step surface, the airtightness between the tracheal head and the adapter can be ensured.

[0023] In an alternative embodiment, an annular convex edge extending towards the axis of the inner cavity is provided at the insertion opening of the inner cavity. A limiting cavity is formed between the annular convex edge and the first limiting step surface. The sealing ring is arranged in the limiting cavity, and the outer diameter of the second pipe section is larger than the inner diameter of the sealing ring.

[0024] Beneficial effects: By providing an annular convex edge at the insertion port of the inner cavity, a limiting concave cavity is formed between the annular convex edge and the first limiting step surface, which facilitates the limiting and fixing of the sealing ring. The sealing ring will not move due to the insertion of the tracheal head, ensuring airtightness. During the insertion of the tracheal head, when the second pipe section touches the sealing ring, the insertion process of the insertion hole will become slightly difficult. However, since the material of the sealing ring is soft rubber, it will deform to allow part of the second pipe section to pass through, and an interference fit is formed between the two until the second pipe section touches the first limiting step surface to complete the clamping and insertion.

[0025] In an alternative embodiment, the sealing ring is integrally formed in the limiting concave cavity by secondary injection molding.

[0026] Beneficial effects: The material of the sealing ring is soft rubber and it is a part molded in the first injection. The material of the adapter is plastic and it is an integrated part molded in the second injection. In this way, the secondary injection molding reduces the process. And it can ensure that the position of the sealing ring will not move.

[0027] In an alternative embodiment, the sphygmomanometer includes a base, and an installation bracket for fixing the adapter is provided in the base. An installation hole suitable for the insertion of the tracheal head is provided on the side wall of the base adjacent to the installation bracket.

[0028] Beneficial effects: Since the installation bracket is located inside the base, it is more convenient for the adapter to be connected to the air pump inside the base. By providing an installation hole on the side wall of the base, it is convenient for the tracheal head to be inserted into the adapter.

[0029] In an alternative embodiment, from the end of the plug to the second limiting step surface, the outer diameter of the plug gradually increases.

[0030] Beneficial effects: Since from the end of the plug to the second limiting step surface, the outer diameter of the plug gradually increases, that is, the plug is approximately conical, it is easier to insert into the inner cavity of the adapter. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a partial cross-sectional view of a sphygmomanometer in the related art;

[0033] Figure 2 It is a structural schematic diagram of an adapter in the related art;

[0034] Figure 3 The Figure 2 cross-sectional view of the adapter shown;

[0035] Figure 4 The partial cross-sectional view of a sphygmomanometer according to an embodiment of the present invention;

[0036] Figure 5 The Figure 4 front view of the adapter shown;

[0037] Figure 6 The Figure 4 structural schematic diagram of the adapter shown;

[0038] Figure 7 The cross-sectional view of another sphygmomanometer according to an embodiment of the present invention;

[0039] Figure 8 The Figure 7 enlarged view at A in ;

[0040] Figure 9 The Figure 8 structural schematic diagram of the adapter in ;

[0041] Figure 10 The Figure 9 cross-sectional view of the adapter shown;

[0042] Figure 11 The Figure 8 front view of the tracheal head in ;

[0043] Figure 12 The Figure 8 structural schematic diagram of the tracheal head in .

[0044] Description of reference numerals in the related art:

[0045] 1a, adapter; 101a, limiting concave platform; 102a, inner cavity; 2a, tracheal head; 201a, plug; 3a, sealing ring;

[0046] Description of reference numerals in the embodiments of the present invention:

[0047] 1, adapter; 102, inner cavity; 103, large-diameter section; 104, small-diameter section; 105, first limiting step surface; 106, annular convex edge; 2, tracheal head; 201, plug; 2011, first pipe section; 2012, second pipe section; 3, sealing ring; 4, base; 401, mounting hole; 5, mounting bracket. Detailed implementation manners

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0049] A sphygmomanometer is an instrument for measuring blood pressure. Existing sphygmomanometers are divided into mercury sphygmomanometers, electronic sphygmomanometers, and spring gauge sphygmomanometers. The more commonly used one is the electronic sphygmomanometer. For example, Figures 1 to 3 , in related technologies, some electronic sphygmomanometers include a cuff and a adapter 1a. The adapter 1a has a limiting concave platform 101a, and a sealing ring 3a is assembled at the limiting concave platform 101a. The air tube head 2a of the cuff is tightly fitted with the jack of the adapter 1a through the sealing ring 3a located at the limiting concave platform 101a. When workers assemble, they need to install the sealing ring 3a on the limiting concave platform 101a of the adapter 1a, and the process time is relatively long; moreover, the plug 201a of the air tube head 2a has a small angle. The deeper the plug 201a is inserted into the inner cavity 102a of the adapter 1a, the larger the outer diameter in contact with the sealing ring 3a. When the plug 201a is fitted with the jack, the user cannot know the insertion depth of the plug 201a and usually inserts it to the bottom. Inserting it to the bottom multiple times will stretch and deform the inner ring of the sealing ring 3a, resulting in insufficient airtightness and thus inaccurate measurement.

[0050] The following will describe the embodiments of the present invention in conjunction with Figures 4 to 12 .

[0051] According to an embodiment of the present invention, a sphygmomanometer is provided, which includes an adapter 1 and an air tube head 2.

[0052] Among them, the adapter 1 has an inner cavity 102. The cavity wall of the inner cavity 102 includes a large-diameter section 103 and a small-diameter section 104. The inner diameter of the large-diameter section 103 is greater than that of the small-diameter section 104, and the large-diameter section 103 is adjacent to the insertion port of the inner cavity 102. A first limiting step surface 105 is formed between the large-diameter section 103 and the small-diameter section 104; the air tube head 2 has a plug 201 adapted to be inserted into the inner cavity 102. The plug 201 is provided with a second limiting step surface adapted to abut against the first limiting step surface 105. When the second limiting step surface abuts against the first limiting step surface 105, the air tube head 2 is hermetically connected to the adapter 1.

[0053] In this embodiment, by providing a first limiting step surface 105 on the inner wall of the inner cavity 102 and the plug 201 being provided with a second limiting step surface adapted to abut against the first limiting step surface 105, during the process of inserting the plug 201 into the inner cavity 102 of the adapter 1, when the second limiting step surface abuts against the first limiting step surface 105, the plug 201 cannot move further inward. At this time, the tracheal head 2 is hermetically connected to the adapter 1, and the plug 201 is inserted in place. Therefore, compared with the related art, it is possible to avoid the deformation of the sealing ring 3 caused by the over-insertion of the tracheal head 2 into the adapter 1, which affects the airtightness.

[0054] It should be noted that the adapter 1 has a channel communicating with the inner cavity 102, and this channel is connected to an air pump, and the air pump can supply air to the inner cavity 102, the tracheal head 2, and the cuff connected to the tracheal head 2 in sequence.

[0055] The following combines Figures 4 to 6 , and specifically describes one specific embodiment of the present invention.

[0056] In this embodiment, a sealing ring 3 is integrated outside the tracheal head 2, and the end face of the sealing ring 3 close to the end of the plug 201 constitutes the second limiting step surface.

[0057] The sealing ring 3 is integrated outside the tracheal head 2. During the process of inserting the plug 201 into the inner cavity 102 of the adapter 1, when the end face of the sealing ring 3 abuts against the first limiting step surface 105, the plug 201 cannot move further inward. At this time, since the sealing ring 3 is in sealing contact with the first limiting step surface 105, the tracheal head 2 is hermetically connected to the adapter 1, and the plug 201 is inserted in place. Therefore, compared with the related art, it is possible to avoid the deformation of the sealing ring 3 caused by the over-insertion of the tracheal head 2 into the adapter 1, which affects the airtightness.

[0058] In this embodiment, the sealing ring 3 and the tracheal head 2 are integrally formed by two-shot injection molding.

[0059] The material of the sealing ring 3 is a soft rubber material, which is a part molded in the first injection molding. The material of the tracheal head 2 is a plastic material, and the tracheal head 2 is a part molded in the second injection molding. Two-shot injection molding can reduce the process, and can firmly connect the sealing ring 3 and the tracheal head 2 into one body. The structure is simple and reliable, and the installation step of the sealing ring 3 is omitted.

[0060] In an embodiment not shown in the figure, the sealing ring 3 can be adhesively bonded outside the tracheal head 2 with glue. In this embodiment, during the process of inserting the plug 201 into the inner cavity 102 of the adapter 1, when the end face of the sealing ring 3 abuts against the first limiting step surface 105, the plug 201 cannot move further inward. At this time, since the sealing ring 3 is in sealing contact with the first limiting step surface 105, the tracheal head 2 and the adapter 1 are hermetically connected, and the plug 201 is inserted in place. Therefore, compared with the related art, it is possible to avoid the deformation of the sealing ring 3 caused by the excessive insertion of the tracheal head 2 into the adapter 1, which affects the airtightness.

[0061] In another embodiment not shown in the figure, a limiting groove can be provided outside the tracheal head 2, and the sealing ring 3 is embedded in the limiting groove by an interference fit and protrudes from the tracheal head 2. In this embodiment, during the process of inserting the plug 201 into the inner cavity 102 of the adapter 1, when the end face of the sealing ring 3 abuts against the first limiting step surface 105, the plug 201 cannot move further inward. At this time, since the end face of the sealing ring 3 is in sealing contact with the first limiting step surface 105, the tracheal head 2 and the adapter 1 are hermetically connected, and the plug 201 is inserted in place. Therefore, compared with the related art, it is possible to avoid the deformation of the sealing ring 3 caused by the excessive insertion of the tracheal head 2 into the adapter 1, which affects the airtightness.

[0062] In this embodiment, the outer diameter of the sealing ring 3 is larger than the inner diameter of the large-diameter section 103.

[0063] The wall of the inner cavity 102 includes a large-diameter section 103 and a small-diameter section 104. A first limiting step surface 105 is formed between the large-diameter section 103 and the small-diameter section 104. The outer diameter of the sealing ring 3 is larger than the inner diameter of the large-diameter section 103. During the process of inserting the plug 201 into the inner cavity 102, since the outer diameter of the sealing ring 3 is larger than the inner diameter of the large-diameter section 103, it is slightly difficult for the sealing ring 3 to enter the large-diameter section 103. However, since the material of the sealing ring 3 is a soft rubber material, the sealing ring 3 will deform and enter the large-diameter section 103 until the sealing ring 3 touches the first limiting step surface 105. Since the diameter of the small-diameter section 104 is smaller, the sealing ring 3 cannot move forward further. In this way, a tight fit is formed, enabling the user to know when the insertion is completed. After the insertion is completed, it is not easy for the user to pull out the tracheal head 2, ensuring the airtightness, and thus ensuring the accuracy of the blood pressure measurement.

[0064] Specifically, the outer diameter of the sealing ring 3 is about 1 mm larger than the inner diameter of the large-diameter section 103. During the process of inserting the plug 201 into the inner cavity 102, since the outer diameter of the sealing ring 3 is about 1 mm larger than the inner diameter of the large-diameter section 103, the sealing ring 3 will be slightly difficult to enter the large-diameter section 103. However, since the material of the sealing ring 3 is a soft rubber material, the sealing ring 3 will deform and enter the large-diameter section 103 until the sealing ring 3 touches the first limiting step surface 105. Since the diameter of the small-diameter section 104 is smaller, the sealing ring 3 cannot continue to move forward. In this way, a tight fit is formed, enabling the user to know when the insertion is completed. After the insertion is completed, it is not easy for the user to pull out the tracheal head 2, ensuring airtightness and thus ensuring the accuracy of blood pressure measurement.

[0065] It should be noted that the outer diameter of the sealing ring 3 refers to the outer diameter in the natural state without deformation. When the sealing ring 3 is compressed, such as Figure 4 , the outer peripheral side of the sealing ring 3 contacts the inner side of the large-diameter section 103.

[0066] In this embodiment, the length of the large-diameter section 103 is equal to the cross-sectional width of the sealing ring 3.

[0067] By making the length of the large-diameter section 103 equal to the cross-sectional width of the sealing ring 3, the sealing ring 3 is just stuck in the large-diameter section 103, without protruding outside the adapter 1, and the insertion difficulty of the tracheal head 2 is also reduced.

[0068] It should be noted that the length of the large-diameter section 103 is the dimension of the large-diameter section 103 in the Figure 4 in the X direction, and the cross-sectional width of the sealing ring 3 refers to the width in the cross-section including the sealing ring 3. Specifically, in combination with Figure 4 , the cross-sectional width of the sealing ring 3 is the dimension in the Figure 4 in the X direction.

[0069] In this embodiment, the blood pressure monitor includes a base 4. An installation bracket 5 for fixing the adapter 1 is provided inside the base 4. An installation hole 401 suitable for inserting the tracheal head 2 is provided on the side wall of the base 4 adjacent to the installation bracket 5. The aperture of the installation hole 401 is smaller than the outer diameter of the sealing ring 3 and larger than the inner diameter of the small-diameter section 104.

[0070] The plug 201 of the tracheal head 2 has to pass through the mounting hole 401 on the side wall first. Since the diameter of the mounting hole 401 is smaller than the outer diameter of the sealing ring 3, it is difficult for the plug 201 to pass through the mounting hole 401. However, because the sealing ring 3 is made of soft rubber material, it will deform and pass through the mounting hole 401 on the side wall until the sealing ring 3 completely passes through the mounting hole 401. The sealing ring 3 will recover its shape to a certain extent. After the sealing ring 3 passes through the mounting hole 401, it will encounter the first limiting step surface 105. Since the diameter of the small-diameter section 104 is smaller, the sealing ring 3 cannot continue to move forward. In this way, a tight fit is formed, enabling the user to know when the insertion is completed. And after the insertion is completed, restricted by the side wall mounting hole 401, it is not easy for the user to pull out the tracheal head 2, ensuring airtightness and thus ensuring the accuracy of blood pressure measurement.

[0071] In this embodiment, from the end of the plug 201 to the second limiting step surface, the outer diameter of the plug 201 gradually increases.

[0072] Since from the end of the plug 201 to the second limiting step surface, the outer diameter of the plug 201 gradually increases, that is, the plug 201 is approximately conical and has a guiding angle, making it easier to insert into the inner cavity 102 of the adapter 1.

[0073] In this embodiment, the sealing ring 3 is integrated on the air pipe head 2 of the cuff. Its position is at the middle of the plug 201 of the air pipe head 2 and is integrated by means of secondary injection molding. The material of the sealing ring 3 is soft rubber and it is a part molded in the first injection. The material of the air pipe head 2 is plastic and it is an integrated part molded in the second injection. In this way, the secondary injection molding will reduce the process steps. The adapter 1 is installed on the mounting bracket 5 integrally extended from the base 4. The adapter 1 has an insertion port communicating with the inner cavity 102 on the side wall in contact with the side wall, and mounting holes 401 are provided on the side wall; at one end of the adapter 1 close to the side wall, there is a large-diameter section 103. The inner diameter of the large-diameter section 103 is about 1 mm smaller than the outer diameter of the sealing ring 3, and its length is equal to the cross-sectional width of the sealing ring 3. This dimension setting can limit the movement of the sealing ring 3. There is a guiding angle on the outer ring at one end of the plug 201 of the air pipe head 2 inserted into the adapter 1, which is easy to insert into the inner cavity 102 of the adapter 1. The cooperation process between the plug 201 of the air pipe head 2 and the adapter 1 is as follows: The plug 201 of the air pipe head 2 first passes through the mounting hole 401 on the side wall until it touches the sealing ring 3. The process of inserting the hole will become slightly difficult, but because the material of the sealing ring 3 is soft rubber, it will deform and pass through the mounting hole 401 on the side wall until the sealing ring 3 completely passes through the mounting hole 401 on the side wall. The sealing ring 3 will recover to its original state to a certain extent, and the front end of the sealing ring 3 will touch the first limiting step surface 105. The inner diameter of the small-diameter section 104 of the adapter 1 is smaller than the aperture of the mounting hole 401 on the side wall, and the sealing ring 3 cannot continue to deform and thus cannot continue to move forward. In this way, a tight hole insertion fit is formed, enabling the user to know when the card insertion is completed during use. After the card insertion is completed, the sealing ring 3 is completely clamped by the cooperation of the mounting hole 401 on the side wall and the first limiting step surface 105, making it difficult for the user to pull out the air pipe head 2, ensuring airtightness and thus ensuring the accuracy of measurement. If it is necessary to pull out the air pipe head 2, the length of the end of the plug 201 of the air pipe head 2 away from the side wall can be set longer or the width of the air pipe head 2 can be set larger, so that the user can better grasp the air pipe head 2 and apply force better.

[0074] The following combines Figures 7 to 12 to describe another specific embodiment of the present invention.

[0075] In this embodiment, the plug 201 includes a first pipe section 2011 and a second pipe section 2012. The outer diameter of the first pipe section 2011 is smaller than the outer diameter of the second pipe section 2012, and a second limiting step surface is formed between the first pipe section 2011 and the second pipe section 2012.

[0076] The outer diameter of the first pipe section 2011 is smaller than that of the second pipe section 2012. The first pipe section 2011 can be completely inserted into the inner cavity 102 until the second limiting step surface abuts against the first limiting step surface 105. Since the plug 201 is made of plastic, it is difficult to deform. Blocked by the first limiting step surface 105, the plug 201 cannot move inward any further, and the insertion is completed. Compared with the related art, it can avoid the deformation of the sealing ring 3 caused by the over-insertion of the air pipe head 2 into the adapter 1, which affects the airtightness.

[0077] Specifically, the outer diameter of the second pipe section 2012 is 0.5 mm larger than that of the first pipe section 2011.

[0078] In this embodiment, a sealing ring 3 is provided between the second pipe section 2012 and the inner wall of the inner cavity 102.

[0079] By providing the sealing ring 3 between the second pipe section 2012 and the inner wall of the inner cavity 102, when the second limiting step surface abuts against the first limiting step surface 105, the airtightness between the air pipe head 2 and the adapter 1 can be ensured.

[0080] In this embodiment, at the insertion port of the inner cavity 102, there is an annular convex edge 106 extending towards the axis of the inner cavity 102. A limiting cavity is formed between the annular convex edge 106 and the first limiting step surface 105. The sealing ring 3 is arranged in the limiting cavity, and the outer diameter of the second pipe section 2012 is larger than the inner diameter of the sealing ring 3.

[0081] By providing the annular convex edge 106 at the insertion port of the inner cavity 102, a limiting cavity is formed between the annular convex edge 106 and the first limiting step surface 105, which is convenient for limiting and fixing the sealing ring 3. The sealing ring 3 will not move due to the insertion of the air pipe head 2, and the airtightness can be ensured. During the insertion of the air pipe head 2, when the second pipe section 2012 touches the sealing ring 3, the insertion process will become slightly difficult. However, since the material of the sealing ring 3 is soft rubber, it will deform to allow part of the second pipe section 2012 to pass through, and the two form an interference fit until the second pipe section 2012 touches the first limiting step surface 105, and the clamping insertion is completed.

[0082] In an embodiment not shown in the figure, the annular convex edge 106 may not be provided, but the sealing ring 3 is fixed outside the second pipe section 2012. When the second limiting step surface abuts against the first limiting step surface 105, the sealing ring 3 is sealingly connected between the second pipe section 2012 and the inner wall of the inner cavity 102, and the sealing ring 3 can abut against the first limiting step surface 105 to ensure the airtightness between the air pipe head 2 and the adapter 1.

[0083] Specifically, a limiting groove can be provided on the second pipe section 2012, and the sealing ring 3 is embedded in the limiting groove by an interference fit method.

[0084] In this embodiment, the sealing ring 3 is integrally formed in the limiting cavity by secondary injection molding.

[0085] The material of the sealing ring 3 is soft rubber, which is the part molded in the first injection. The material of the adapter 1 is plastic, which is the integrated part molded in the second injection. Thus, the secondary injection molding can reduce the process steps and ensure that the position of the sealing ring 3 will not move.

[0086] In this embodiment, from the end of the plug 201 to the second limiting step surface, the outer diameter of the plug 201 gradually increases.

[0087] Since from the end of the plug 201 to the second limiting step surface, the outer diameter of the plug 201 gradually increases, that is, the plug 201 is approximately conical, it is easier to insert into the inner cavity 102 of the adapter 1.

[0088] In this embodiment, the sphygmomanometer includes a base 4. An installation bracket 5 for fixing the adapter 1 is provided in the base 4. An installation hole 401 suitable for inserting the tracheal head 2 is provided on the side wall of the base 4 adjacent to the installation bracket 5.

[0089] Since the installation bracket 5 is located inside the base 4, it is more convenient for the adapter 1 to be connected to the air pump inside the base 4. By providing the installation hole 401 on the side wall of the base 4, it is convenient for the tracheal head 2 to be inserted into the adapter 1.

[0090] In this embodiment, the sealing ring 3 is integrated on the adapter 1 at the position of the limiting cavity at one end of the side wall of the adapter 1 close to the base 4 by means of secondary injection molding. The sealing ring 3 is made of soft rubber material and is a part molded in the first injection. The adapter 1 is made of plastic material and is an integrated part molded in the second injection. The inner diameter of the small-diameter section 104 of the adapter 1 is smaller than the inner diameter of the sealing ring 3, and the inner diameter of the limiting convex edge is smaller than the outer diameter of the sealing ring 3. Therefore, the sealing ring 3 is completely embedded in the limiting cavity, and the limiting convex edge fitting the side wall wraps the sealing ring 3 to prevent the sealing ring 3 from falling off. The plug 201 of the air pipe head 2 includes a first pipe section 2011 and a second pipe section 2012 with different diameters, so it is in a stepped shape. The first pipe section 2011 can be completely inserted into the inner cavity 102. The outer diameter of the second pipe section 2012 is 0.5 mm larger than the inner diameter of the sealing ring 3. Therefore, the outer diameter of its second pipe section 2012 is smaller than the inner diameter of the inner cavity 102 and will be restricted from advancing by the first limiting step surface 105 formed between the small-diameter section 104 and the large-diameter section 103. At the same time, it also has an interference fit with the sealing ring 3 to ensure airtightness. The cooperation process of the plug 201 of the air pipe head 2 and the adapter 1 in this embodiment is as follows: The plug 201 first passes through the installation hole 401 on the side wall until the second pipe section 2012 touches the sealing ring 3. The insertion process of the socket will become slightly difficult. However, due to the soft rubber material of the sealing ring 3, it will deform to allow the second pipe section 2012 to pass through and form an interference fit. Until the second pipe section 2012 touches the first limiting step surface 105 formed between the small-diameter section 104 and the large-diameter section 103, the snap-in is completed.

[0091] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A sphygmomanometer, characterized in that, Comprising: An adapter (1) having an inner cavity (102), the cavity wall of the inner cavity (102) including a large-diameter section (103) and a small-diameter section (104), the inner diameter of the large-diameter section (103) being greater than the inner diameter of the small-diameter section (104), and the large-diameter section (103) being adjacent to the insertion opening of the inner cavity (102), a first limiting step surface (105) being formed between the large-diameter section (103) and the small-diameter section (104); A tracheal head (2) having a plug (201) adapted to be inserted into the inner cavity (102), the plug (201) being provided with a second limiting step surface adapted to abut against the first limiting step surface (105), and when the second limiting step surface abuts against the first limiting step surface, the tracheal head (2) is sealingly connected to the adapter (1). A sealing ring (3) is integrally formed outside the tracheal head (2), and the end face of the sealing ring (3) close to the end of the plug (201) constitutes the second limiting step surface. The sphygmomanometer includes a base (4), and an installation bracket (5) for fixing the adapter (1) is provided in the base (4). An installation hole (401) suitable for the tracheal head (2) to be inserted is provided in the side wall of the base (4) adjacent to the installation bracket (5), the aperture of the installation hole (401) being smaller than the outer diameter of the sealing ring (3) and greater than the inner diameter of the small-diameter section (104); The plug (201) includes a first pipe section (2011) and a second pipe section (2012), the outer diameter of the first pipe section (2011) being smaller than the outer diameter of the second pipe section (2012), and the second limiting step surface being formed between the first pipe section (2011) and the second pipe section (2012).

2. The sphygmomanometer according to claim 1, wherein The sealing ring (3) and the tracheal head (2) are integrally formed by secondary injection molding.

3. The sphygmomanometer according to claim 1, characterized in that, The outer diameter of the sealing ring (3) is greater than the inner diameter of the large-diameter section (103).

4. The sphygmomanometer according to claim 1, wherein The length of the large-diameter section (103) is equal to the cross-sectional width of the sealing ring (3).

5. The sphygmomanometer according to claim 1, characterized in that, A sealing ring (3) is provided between the second pipe section (2012) and the cavity wall of the inner cavity (102).

6. The sphygmomanometer according to claim 5, characterized in that, At the insertion opening of the inner cavity (102), a circular convex edge (106) extending towards the axis of the inner cavity (102) is provided, a limiting concave cavity being formed between the circular convex edge (106) and the first limiting step surface (105), the sealing ring (3) being provided in the limiting concave cavity, and the outer diameter of the second pipe section (2012) being greater than the inner diameter of the sealing ring (3).

7. The sphygmomanometer according to claim 6, wherein, The sealing ring (3) is integrally formed in the limiting concave cavity by secondary injection molding.

8. The sphygmomanometer according to any one of claims 1 to 7, characterized in that, From the end of the plug (201) to the second limiting step surface, the outer diameter of the plug (201) gradually increases.

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