Anti-loosening structure of hemoperfusion device
By setting a stop-retardation structure between the housing and the end cap of the blood perfusion device, the problem of loose end cap of the traditional blood perfusion device being solved in the high-pressure steam sterilization rear, achieving higher sealing and production efficiency.
Patent Information
- Application Number
- CN202421494410.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-06-27
AI Technical Summary
After the traditional blood perfusion device is sterilized by high-pressure steam, the end cap is loose due to the deformation of the thread fit, which affects the sealing and production efficiency.
A blood perfusion device anti-loosening structure is designed. By providing external threads and internal threads between the housing and the end cap, and providing an annular step and a first stop-loosening teeth at the end of the external thread, and a second stop-loosening teeth on the end cap, these tooth structures are used to guide and block during the tightening process to prevent the end cap from loosening.
It effectively prevents the retraction of the sterilization rear end cover of the perfusion device, improves sealing and production efficiency, and avoids glue coating and additional screwing operations.
Smart Images
Figure CN222942746U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of blood perfusion devices and relates to a blood perfusion device anti-loosening structure. Background Art
[0002] In recent years, with the continuous development of medical technology, disposable hemoperfusion devices have been widely used in clinical practice as important instruments for blood purification treatment. The end caps at both ends of the hemoperfusion device are equipped with blood inlets and outlets. Blood flows in from the lower end of the device and flows out from the upper end. The fat-soluble medium and macromolecules in the blood are adsorbed by the internal resin to purify the blood. During the production process, the product needs to be sterilized. The sterilization methods include: high-pressure steam sterilization, irradiation sterilization, and ethylene oxide sterilization. The traditional high-pressure steam sterilization method has better stability, sustainability, and lethality, and therefore also has the highest safety factor.
[0003] When the assembled perfusion device is sterilized with high-pressure steam, the plastic parts are heated from room temperature to 121°C, and then cooled from 121°C to room temperature. After the temperature difference, all threaded parts will be deformed and loosened. To solve the deformation and loosening problem, either glue is applied to the threads before sterilization, which seriously affects the production efficiency and causes pollution to the product; or the end caps at both ends are tightened again after sterilization, which also affects the efficiency and the antibacterial protection after sterilization.
[0004] At the same time, the assembly of the shell and the end cover is completed by the screwing and engagement of the threads. Usually, the thread shape is triangular or isosceles trapezoidal. The triangular thread is not strong enough, while the isosceles trapezoidal thread has two symmetrical inclined surfaces. When the inclined surfaces are engaged under force, they will expand outward, causing the end cover to deform, thereby affecting the sealing of the perfusion device. Utility Model Content
[0005] The utility model aims to solve the above problems in the prior art and proposes a blood perfusion device anti-loosening structure with good loosening effect.
[0006] The purpose of the utility model can be achieved through the following technical solutions:
[0007] The anti-loosening structure of the blood perfusion device is arranged between the shell and the end cover of the blood perfusion device, and includes an external thread arranged at the end of the shell and an internal thread arranged on the end cover. When connected, the external thread and the internal thread cooperate with each other. The shell is provided with an annular step located at the end of the external thread, and the annular step is provided with a first anti-loosening tooth. The end cover is provided with a second anti-loosening tooth for engaging with the first anti-loosening tooth when the end cover is tightened with the shell.
[0008] In the above-mentioned anti-loosening structure of the blood perfusion device, the first anti-loosening tooth has an inclined first guide surface and a first blocking surface intersecting with the first guide surface, and the first guide surface extends obliquely from the annular step along the tightening direction of the end cover to the intersection with the first blocking surface, and the first blocking surface is perpendicular to the surface where the annular step is located.
[0009] The angle between the first guide surface and the surface where the annular step is located is less than 30°. During the tightening process of the end cover, the first guide surface guides the second stop tooth, which is conducive to the second stop tooth passing over the first stop tooth. When the end cover is tightened in place, the first blocking surface blocks the second stop tooth, which can effectively prevent the end cover from loosening.
[0010] In the above-mentioned anti-loosening structure of the blood perfusion device, the first anti-loosening teeth are multiple and are arranged in sequence along the annular direction of the annular step. The multiple first anti-loosening teeth are arranged at equal intervals.
[0011] In the above-mentioned anti-loosening structure of the blood perfusion device, the second anti-loosening tooth has an inclined second guide surface and a second blocking surface intersecting with the second guide surface, and the second guide surface extends obliquely from its connection with the end cover along the unscrewing direction of the end cover to its intersection with the second blocking surface, and the second blocking surface is perpendicular to the end surface of the end cover.
[0012] The second guide surface is inclined in the opposite direction to the first guide surface, and the included angle between the second guide surface and the end surface of the end cover is less than 30°. During the tightening process of the end cover, the second guide surface guides the first stop tooth, which is conducive to the first stop tooth passing over the second stop tooth. When the end cover is tightened in place, the first blocking surface is against the second blocking surface.
[0013] In the above anti-loosening structure of the blood perfusion device, the second anti-recession teeth are multiple and evenly distributed along the circumferential direction of the end cap. The second anti-recession teeth are distributed around the circumference of the end cap, and the second anti-recession teeth are engaged with the first anti-recession teeth when tightened.
[0014] In the above-mentioned anti-loosening structure of the blood perfusion device, the cross-section of the external thread is trapezoidal, and the side of the external thread facing the end of the external thread has a first occlusal force-bearing surface, and the angle between the first occlusal force-bearing surface and the surface where the annular step is located is 0-3°; the cross-section of the internal thread is trapezoidal, and the side of the internal thread facing the end of the internal thread has a second occlusal force-bearing surface parallel to the first occlusal force-bearing surface, and the second occlusal force-bearing surface is engaged with the first occlusal force-bearing surface when tightened.
[0015] In the above-mentioned anti-loosening structure of the blood perfusion device, the side of the external thread facing the starting end of the external thread has a first thread bevel, and the side of the internal thread facing the starting end of the internal thread has a second thread bevel parallel to the first thread bevel. When tightening, there is a gap between the second thread bevel and the first thread bevel.
[0016] The angle between the first thread bevel and the surface where the annular step is located is 15 degrees, which helps to improve the strength of the external thread, and the second thread bevel also helps to improve the strength of the internal thread. When tightening, due to the gap between the second thread bevel and the first thread bevel, the end cap will not be deformed, thereby improving the sealing of the perfusion device.
[0017] Compared with the prior art, the anti-loosening structure of the blood perfusion device has the following advantages: the first anti-loosening tooth and the second anti-loosening tooth can prevent the rear end cover of the perfusion device from loosening after sterilization, and there is no need to apply glue or screw the end cover again after sterilization, thereby improving work efficiency; when tightening, there is a gap between the second threaded bevel and the first threaded bevel, which will not cause deformation of the end cover, thereby improving the sealing of the perfusion device. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the blood perfusion device provided by the utility model.
[0019] Figure 2 yes Figure 1 Enlarged schematic diagram at point A in the middle.
[0020] Figure 3 yes Figure 1 Enlarged schematic diagram of point B in the middle.
[0021] Figure 4 It is a cross-sectional view of the blood perfusion device provided by the utility model.
[0022] Figure 5 It is a cross-sectional view of the external thread and the internal thread.
[0023] In the figure, 1, shell; 11, external thread; 111, first occlusal force-bearing surface; 112, first thread bevel; 12, annular step; 13, first back-stop tooth; 131, first guide surface; 132, first blocking surface; 2, end cover; 21, internal thread; 211, second occlusal force-bearing surface; 212, second thread bevel; 22, second back-stop tooth; 221, second guide surface; 222, second blocking surface. DETAILED DESCRIPTION
[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0025] The anti-loosening structure of the blood perfusion device is arranged between the housing 1 and the end cover 2 of the blood perfusion device. Figure 1 and Figure 4 As shown, it comprises an external thread 11 provided at the end of the housing 1 and an internal thread 21 provided on the end cover 2. When connected, the external thread 11 and the internal thread 21 are threadably matched.
[0026] like Figure 1 , Figure 2 and Figure 4 As shown, the housing 1 is provided with an annular step 12 at the end of the external thread 11, and a first stop tooth 13 is provided on the end surface of the annular step 12 facing the end cover 2. There are multiple first stop teeth 13 and they are arranged in sequence along the annular direction of the annular step 12. The multiple first stop teeth 13 are arranged at equal distances. Figure 1 and Figure 3 As shown, the end cover 2 is provided with a second stop tooth 22 for engaging with the first stop tooth 13 when the end cover 2 and the housing 1 are tightened. The second stop teeth 22 are multiple and evenly distributed along the circumferential direction of the end cover 2. When tightened, the second stop teeth 22 engage with the first stop teeth 13.
[0027] like Figure 2 As shown, the first stop tooth 13 has an inclined first guide surface 131 and a first blocking surface 132 intersecting with the first guide surface 131. The first guide surface 131 extends obliquely from the annular step 12 along the tightening direction of the end cover 2 to the intersection with the first blocking surface 132. The first blocking surface 132 is perpendicular to the surface where the annular step 12 is located. During the tightening action, driven by the end cover 2, the second stop tooth 22 moves along the first guide surface 131 from one end close to the annular step 12 to the other end.
[0028] The angle between the first guide surface 131 and the surface where the annular step 12 is located is 20°. During the tightening process of the end cover 2, the first guide surface 131 guides the second stop tooth 22, which is conducive to the second stop tooth 22 passing over the first stop tooth 13. When the end cover 2 is tightened in place, the first blocking surface 132 blocks the second stop tooth 22, which can effectively prevent the end cover 2 from loosening.
[0029] In order to facilitate the second stop tooth 22 to easily pass over the first stop tooth 13 , an arc transition surface is provided at the intersection of the first guide surface 131 and the first blocking surface 132 .
[0030] like Figure 3 As shown, the second stop tooth 22 has an inclined second guide surface 221 and a second blocking surface 222 intersecting with the second guide surface 221. The second guide surface 221 extends obliquely from the connection with the end cover 2 along the unscrewing direction of the end cover 2 to the intersection with the second blocking surface 222. The second blocking surface 222 is perpendicular to the end surface of the end cover 2. During the tightening action, the first stop tooth 13 moves along the second guide surface 221 close to one end of the end cover 2 to the other end. The second guide surface 221 is inclined in the opposite direction to the first guide surface 131. The angle between the second guide surface 221 and the end surface of the end cover 2 is 20°. During the tightening process of the end cover 2, the second guide surface 221 guides the first stop tooth 13, which is conducive to the first stop tooth 13 passing over the second stop tooth 22. When the end cover 2 is tightened in place, the first blocking surface 132 is against the second blocking surface 222.
[0031] In order to facilitate the first stop tooth 13 to easily pass over the second stop tooth 22 , an arc transition surface is provided at the intersection of the second guide surface 221 and the second blocking surface 222 .
[0032] like Figure 4 and Figure 5 As shown, the cross-section of the external thread 11 is trapezoidal, and the side of the external thread 11 facing the end of the external thread 11 has a first occlusal stress-bearing surface 111, and the angle between the first occlusal stress-bearing surface 111 and the surface where the annular step 12 is located is 0-3°; the cross-section of the internal thread 21 is trapezoidal, and the side of the internal thread 21 facing the end of the internal thread 21 has a second occlusal stress-bearing surface 211 parallel to the first occlusal stress-bearing surface 111, and the second occlusal stress-bearing surface 211 engages with the first occlusal stress-bearing surface 111 when tightening.
[0033] The end of the external thread 11 is the end close to the annular step 12, and the end of the internal thread 21 is the inner end of the end cover 2. After tightening, the end of the external thread 11 is adjacent to the starting end of the internal thread 21, and the starting end of the external thread 11 is adjacent to the end of the internal thread 21.
[0034] like Figure 5 As shown, the side of the external thread 11 facing the starting end of the external thread 11 has a first thread bevel 112, and the side of the internal thread 21 facing the starting end of the internal thread 21 has a second thread bevel 212 parallel to the first thread bevel 112, and a gap is provided between the second thread bevel 212 and the first thread bevel 112 when tightening. The angle between the first thread bevel 112 and the surface where the annular step 12 is located is 15 degrees, which helps to improve the strength of the external thread 11, and the second thread bevel 212 also helps to improve the strength of the internal thread 21. When tightening, due to the gap between the second thread bevel 212 and the first thread bevel 112, the end cap 2 will not be deformed, thereby improving the sealing of the perfusion device.
[0035] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A blood perfusion device anti-loosening structure, arranged between a housing (1) and an end cover (2) of a blood perfusion device, characterized in that: The invention comprises an external thread (11) provided at the end of a shell (1) and an internal thread (21) provided on an end cover (2); the external thread (11) and the internal thread (21) are threadedly matched when connected; the shell (1) is provided with an annular step (12) located at the end of the external thread (11); the annular step (12) is provided with a first stop tooth (13); the end cover (2) is provided with a second stop tooth (22) for engaging with the first stop tooth (13) when the end cover (2) and the shell (1) are tightened.
2. The anti-loosening structure of the blood perfusion device according to claim 1, characterized in that: The first stop tooth (13) comprises an inclined first guide surface (131) and a first blocking surface (132) intersecting the first guide surface (131); the first guide surface (131) extends obliquely from the annular step (12) along the tightening direction of the end cover (2) to the intersection with the first blocking surface (132); the first blocking surface (132) is perpendicular to the surface where the annular step (12) is located.
3. The anti-loosening structure of the blood perfusion device according to claim 2, characterized in that: The first stop teeth (13) are multiple and are arranged in sequence along the annular direction of the annular step (12).
4. The anti-loosening structure of the blood perfusion device according to claim 1, characterized in that: The second stop tooth (22) comprises an inclined second guide surface (221) and a second blocking surface (222) intersecting the second guide surface (221); the second guide surface (221) extends obliquely from a connection point with the end cover (2) along a direction of unscrewing the end cover (2) to an intersection with the second blocking surface (222); the second blocking surface (222) is perpendicular to an end surface of the end cover (2).
5. The anti-loosening structure of the blood perfusion device according to claim 1, 2, 3 or 4, characterized in that: The second stop teeth (22) are multiple and evenly distributed along the circumferential direction of the end cover (2).
6. The anti-loosening structure of the blood perfusion device according to claim 1, characterized in that: The cross section of the external thread (11) is trapezoidal, and the side of the external thread (11) facing the end of the external thread (11) has a first occlusal stress-bearing surface (111), and the angle between the first occlusal stress-bearing surface (111) and the surface where the annular step (12) is located is 0-3°; the cross section of the internal thread (21) is trapezoidal, and the side of the internal thread (21) facing the end of the internal thread (21) has a second occlusal stress-bearing surface (211) parallel to the first occlusal stress-bearing surface (111), and the second occlusal stress-bearing surface (211) is engaged with the first occlusal stress-bearing surface (111) when tightened.
7. The anti-loosening structure of the blood perfusion device according to claim 6, characterized in that: The side of the external thread (11) facing the starting end of the external thread (11) has a first thread bevel (112), and the side of the internal thread (21) facing the starting end of the internal thread (21) has a second thread bevel (212) parallel to the first thread bevel (112), and when tightened, there is a gap between the second thread bevel (212) and the first thread bevel (112).