A hand-held gas-driven medical device

Abstract

A handheld gas-driven medical device includes a machine head. The machine head includes a housing and an air wheel rotatably disposed within the housing. An accommodation cavity is formed within the housing to accommodate the air wheel. A main air inlet and an exhaust port communicating with the accommodation cavity are formed on the housing. A plurality of grooves are provided on the inner wall surface of the housing surrounding the accommodation cavity, and the grooves are spaced apart along the circumferential direction of the housing. In the present invention, the rotating air flow directed towards the grooves is reflected by the grooves, causing changes in the direction and speed of the air flow to form an interfering air flow, which can effectively reduce the rotation speed of the machine head during idling and effectively ensure the torque output of the machine head when grinding teeth. Moreover, the overall structure is simple, easy to form, and the cost is controllable.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular, to a handheld gas-driven medical device. Background Art

[0002] The turbine handpiece generates power by blowing the wind wheel to rotate through compressed air, and is often used for grinding teeth, etc. Usually, the cutting speed of the head of the turbine handpiece is about 200,000 revolutions per minute to ensure that sufficient torque can be generated by the head when grinding teeth, so as to avoid the head from jamming or rotating too slowly, which affects the working efficiency.

[0003] However, in order to ensure the cutting speed of the turbine handpiece, the no-load speed of its head is as high as 300,000 - 450,000 revolutions per minute, which greatly reduces the service life of the head bearing. For this reason, high-quality high-speed bearings are used in the industry to bear the high speed of the head to improve the service time of the bearing, but the high-speed bearings are expensive, which greatly increases the cost; in addition, there is also a method of limiting the pressure of the main air hole of the head to limit the flow rate of the compressed air at the main air hole, so as to achieve the purpose of reducing the head speed and increasing the service life of the bearing, but this will make the head torque insufficient and affect the work of doctors. Summary of the Invention

[0004] In view of this, a handheld gas-driven medical device that can effectively solve the above problems is provided.

[0005] A handheld gas-driven medical device includes a head, the head includes a housing and a wind wheel rotatably disposed in the housing, a receiving cavity is formed in the housing to receive the wind wheel, a main air hole and an exhaust hole communicating with the receiving cavity are formed on the housing, and a plurality of grooves are provided on the wall surface of the housing surrounding the receiving cavity, and the grooves are spaced apart along the circumferential direction of the housing.

[0006] In one embodiment, in the circumferential direction of the wall surface of the receiving cavity, the grooves are distributed between the main air hole and the exhaust hole, and the overall circumferential interval between the grooves and the main air hole is greater than the overall circumferential interval between the grooves and the exhaust hole.

[0007] In one embodiment, the number of the grooves is 3 - 150. Wherein, the arc length corresponding to the circumferential interval between the centers of any two adjacent grooves is not greater than half of the circumference.

[0008] In one embodiment, the depth of the groove recessed radially with respect to the wall surface of the receiving cavity is not greater than 1.0 mm.

[0009] In one embodiment, the axial length of the groove is less than 10 mm, and each groove is a continuous or discontinuous straight groove parallel to the axis of the housing. Alternatively, each groove is a continuous or discontinuous inclined groove inclined at a certain angle relative to the axis of the housing. Each groove is a spiral groove extending spirally along the wall surface of the accommodation cavity.

[0010] In one embodiment, the radial cross-section of the groove is arc-shaped, parabolic, triangular, trapezoidal or irregular.

[0011] In one embodiment, the wall surface of the groove is arc-shaped, and the corresponding arc radius is greater than the radial depth of the groove.

[0012] Compared with the prior art, in the hand-held gas-driven medical device of the present invention, grooves are recessed on the wall surface of the housing surrounding the wind wheel to reflect the rotating air flow hitting the grooves, causing changes in the air flow direction and speed to form interfering air flow, which can effectively reduce the rotation speed during the idling of the machine head and effectively ensure the torque output during the grinding of teeth by the machine head. Moreover, the overall structure is simple, easy to mold, and the cost is controllable. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of an embodiment of the hand-held gas-driven medical device of the present invention.

[0014] Figure 2 is Figure 1 a radial cross-sectional view of the hand-held gas-driven medical device shown, with the internal air flow direction indicated by arrows in the figure.

[0015] Figure 3 is Figure 1 an axial cross-sectional view of the hand-held gas-driven medical device shown.

[0016] Figure 4 is Figure 1 an axial cross-sectional view of the machine head housing of the hand-held gas-driven medical device shown.

[0017] Figure 5 is Figure 4 a cross-sectional view of the housing shown along line A-A.

[0018] Figure 6 is Figure 5 a developed cross-sectional view of the housing shown along line B-O-B. Detailed Embodiments

[0019] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. One or more embodiments of the present invention are exemplarily shown in the drawings to make the understanding of the technical solutions disclosed by the present invention more accurate and thorough. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments described below.

[0020] As Figure 1 shown, a handheld gas-driven medical device according to an embodiment of the present invention includes a head 10 and a handle 20 connected to the head 10. The handle 20 is convenient for a user, such as a doctor, to hold. Please also refer to Figure 2 and Figure 3 , the head 10 includes a housing 12, a rear cover 14 connected to the housing 12, a central shaft 16 rotatably disposed in the housing 12, and a wind wheel 18 sleeved on the central shaft 16. As Figure 4 shown, the housing 12 is generally a cylindrical structure, and an axially penetrating shaft hole 120 is formed inside. The rear cover 14 covers one axial end of the housing 12, the central shaft 16 is rotatably disposed in the shaft hole 120, one end of the central shaft 16 is supported on the rear cover 14, and the other end passes through the other axial end of the housing 12 and extends outward. The wind wheel 18 is fixedly sleeved on the central shaft 16 and drives the central shaft 16 to rotate synchronously, and the two can be in a tight fit, key connection, snap fit, etc.

[0021] An axially middle part of the inner wall surface of the housing 12 is recessed radially to form a receiving cavity 122 surrounding the shaft hole 120 for setting the wind wheel 18. Please also refer to Figure 2 , the diameter of the wind wheel 18 is slightly smaller than the diameter of the receiving cavity 122. After the wind wheel 18 is assembled in the housing 12, its outer edge is radially spaced from the wall surface 123 of the housing 12 surrounding the receiving cavity 122, and a flow channel 125 surrounding the wind wheel 18 is formed therebetween. Preferably, axially both ends of the inner wall surface of the housing 12 at the receiving cavity 122 are recessed radially to form a receiving space 124 surrounding the shaft hole 120, and a bearing 19 is provided in each receiving space 124 to support the high-speed rotation of the central shaft 16. The bearing 19 is preferably a ball bearing, and a sealing ring 11 is provided between the radially outer wall surface 129 of the bearing 19 and the inner wall surface of the housing 12.

[0022] Please also refer to Figures 4 to 6, a main air hole 126 and an exhaust hole 127 communicating with the accommodation cavity 122 are formed on the outer shell 12, which are respectively used for the inflow and outflow of compressed air. In this embodiment, the main air hole 126 and the exhaust hole 127 are formed at the position where the outer shell 12 is connected to the handle 20 and face the wind wheel 18 in the outer shell 12. Compressed air enters the accommodation cavity 122 of the outer shell 12 through the main air hole 126 and flows towards the exhaust hole 127 along the flow channel 125 between the wind wheel 18 and the wall surface 123 surrounding the accommodation cavity 122 ( Figure 2 as shown by the clockwise flow) to form a rotating air flow 30, and finally is discharged outwards through the exhaust hole 127. During the process that the rotating air flow 30 flows through the outer shell 12, it drives the wind wheel 18 to drive the central shaft 16 pivotally connected thereto to rotate in the clockwise direction. In other embodiments, the compressed air can also form a rotating air flow that rotates counterclockwise, thereby driving the wind wheel 18 and the central shaft 16 to rotate counterclockwise, which is not limited to this embodiment.

[0023] As Figure 2 , Figure 3 shown, several grooves 128 are provided on the wall surface 123 of the outer shell 12 surrounding the accommodation cavity 122. In the shown embodiment, these grooves 128 are formed by the radial depression of the wall surface 123. The depth T of the grooves 128 recessed radially relative to the wall surface 123 is much smaller than the radial thickness of the outer shell 12, that is to say, the grooves 128 are blind grooves that do not penetrate the outer shell 12, and their radial depth is not greater than 1.0 mm, preferably 0.1 - 0.5 mm. The grooves 128 can have various structures in shape. For example, their radial cross-section can be arc-shaped, trapezoidal, triangular, irregular shape, etc. In this embodiment, the cross-section of each groove 128 is arc-shaped, the radius R of the arc is 0.5 mm, and the depth T of the groove 128 recessed relative to the wall surface 123 is less than its radius R, with a maximum of 0.3 mm.

[0024] Each groove 128 extends parallel to the axial direction of the outer shell 12, and its axial length is similar to the axial height of the wind wheel 18 and faces the wind wheel 18 axially. Preferably, the axial length L of the groove 128 is less than 10 mm. In this embodiment, the groove 128 is a continuous straight groove parallel to the axial direction of the outer shell 12, and its axial length L is about 3 mm. In other embodiments, the groove 128 can also be an inclined groove inclined at a certain angle relative to the axis of the outer shell 12 or a spiral groove spirally extending along the wall surface 123 of the accommodation cavity 122, etc. Additionally, in some embodiments, each groove 128 can also be intermittent.

[0025] The grooves 128 are arranged in sequence from the main air hole 126 to the exhaust hole 127 along the circumferential direction of the inner wall surface of the housing 12, and preferably the number is 3 - 150. To enhance the interference effect on the compressed air, the arc length corresponding to the circumferential interval between the centers of any two adjacent grooves 128 is not greater than half of the circumference. As Figure 5 shown, in this embodiment, the number of the grooves 128 is ten, and they are evenly spaced from each other. The groove 128 at the leading end in the air flow direction is at a certain distance from the main air hole 126 in the circumferential direction, and the groove 128 at the trailing end is relatively closer to the exhaust hole 127 in the circumferential direction. That is to say, the circumferential distance between the groove 128 and the main air hole 126 is greater than the circumferential distance between the groove 128 and the exhaust hole 127. In this embodiment, the arc length occupied by the ten grooves 128 in the circumferential direction of the housing 12 is approximately half of the circumference, that is, corresponding to a central angle of 180 degrees; the arc length corresponding to the circumferential interval between the centers of two adjacent grooves 128 is approximately 1 / 18 of the circumference, that is, corresponding to a central angle of 20 degrees.

[0026] The groove 128 is formed by the depression of the wall surface 123 of the housing 12 surrounding the accommodation cavity 122. The curvature of the wall surface 129 surrounding the groove 128 is different from that of the wall surface 123 surrounding the accommodation cavity 122. Thus, the tangents at each point of the wall surface 129 are different from those of the wall surface 123. In this embodiment, at the connection between the wall surface 129 of the groove 128 and the wall surface 123 of the accommodation cavity 122, an angle ɑ is formed between the tangent of the wall surface 129 and the tangent of the wall surface 123, and the angle ɑ is approximately 52 degrees. When the compressed air flows along the flow channel 125 in the housing 12, it generally flows along the wall surface 123 surrounding the accommodation cavity 122, and part of the air flow will shoot into the groove 128 and be reflected at the wall surface 129 of the groove 128. As Figure 2 shown, the air flow reflected by the groove 128 not only changes in direction but also loses energy, resulting in a decrease in speed and becoming the interference air flow 32.

[0027] When the handheld gas-driven medical device of the present invention is in use, compressed air enters the accommodation cavity 122 of the machine head 10 through the main air hole 126, and flows at high speed along the flow channel 125 between the wind wheel 18 and the wall surface 123 surrounding the accommodation cavity 122, forming a rotating air flow 30 to drive the wind wheel 18 and drive the central shaft 16 to rotate at high speed. Since a groove 128 is formed on the wall surface 123 surrounding the wind wheel 18, part of the rotating air flow 30 enters the groove 128 and is reflected by the groove 128 during the process of flowing along the wall surface 123, forming an interference air flow 32 with inconsistent directions and speeds. The interference air flow 32 hinders the high-speed rotation of the wind wheel 18 and reduces the rotation speed of the wind wheel 18. The more the number of the grooves 128, the more the formed interference air flow 32, and the more obvious the speed reduction of the wind wheel 18; in addition, the higher the speed of the rotating air flow 30, the greater the influence of the interference air flow 32, and the more obvious the speed reduction of the wind wheel 18.

[0028] To ensure that the handheld gas-driven medical device of the present invention can generate sufficient torque when grinding teeth, the flow rate or air pressure of the compressed air passing through the main air hole 126 will be increased as much as possible so that the wind wheel 18 can obtain a greater driving force. When the handheld gas-driven medical device is idling, the wind wheel 18 has no load and its rotation speed is relatively higher. Theoretically, it can reach up to 300,000 - 450,000 revolutions per minute. Due to the influence of the interference air flow 32 formed by the groove 128 on the rotating air flow 30, it hinders the wind wheel 18, resulting in a significant reduction in the actual idling speed of the handheld gas-driven medical device. Thus, the bearing 19 can have a longer service life. When the handheld gas-driven medical device is grinding teeth, the rotation speed of its wind wheel 18 will be approximately reduced to about 200,000 revolutions per minute due to the influence of the load. At this time, the rotation speed of the wind wheel 18 is much lower than that of the rotating air flow 30. Due to the action of the groove 128, the influence of the formed interference air flow 32 on the wind wheel 18 can be basically ignored, ensuring that the handheld gas-driven medical device outputs sufficient torque, avoiding the machine head 10 from jamming and not rotating or having too low a rotation speed, and ensuring the working efficiency of the handheld gas-driven medical device of the present invention.

[0029] In the hand-held gas-driven medical device of the present invention, a groove 128 is provided on the wall surface 123 of the housing 12 surrounding the wind wheel 18. The rotating air flow 30 shooting towards the groove 128 is reflected, causing changes in direction and speed to form an interfering air flow 32. The interfering air flow 32 causes obvious interference to the wind wheel 18 when the nose 10 idles, effectively reducing the rotation speed of the wind wheel 18 and prolonging the service life of the bearing 19. At the same time, when the nose 10 grinds teeth, the rotation speed of its wind wheel 18 will significantly decrease due to the influence of the load. The influence of the interfering air flow 32 on the wind wheel 18 is far lower than the influence of the load. Therefore, the interfering air flow 32 basically does not respond to the rotation speed of the nose 10 when grinding teeth, ensuring sufficient torque output. The present invention can ensure the torque output during grinding while effectively reducing the rotation speed during no-load operation and prolonging the service life of the bearing 19 through the setting of the groove 128. The groove 128 can be formed by a reciprocating motion of a profiling cutter on a numerically controlled lathe, or can be processed by a power head with a milling cutter on a numerically controlled lathe with milling function. The manufacturing process is simple and basically has no impact on the overall cost.

[0030] It should be noted that the present invention is not limited to the above embodiments. According to the creative spirit of the present invention, those skilled in the art can also make other changes. These changes made based on the creative spirit of the present invention should be included within the scope of protection required by the present invention.

Claims

1. A handheld gas-driven medical device, comprising a head, the head including a housing and a wind wheel rotatably disposed within the housing, Characterized in that, A receiving cavity is formed within the housing to receive the wind wheel, a main air hole and an exhaust hole communicating with the receiving cavity are formed on the housing, and a plurality of grooves are provided on the wall surface of the housing surrounding the receiving cavity, the grooves being spaced apart circumferentially along the housing, and the plurality of grooves are used to form interfering airflows that impede the rotation of the wind wheel by reflecting the rotating airflows directed at the grooves, and the depth of the grooves recessed radially with respect to the wall surface of the receiving cavity is not greater than 1.0 mm.

2. The handheld gas-driven medical device according to claim 1, Characterized in that, Circumferentially on the wall surface of the receiving cavity, the grooves are distributed between the main air hole and the exhaust hole, and the overall circumferential spacing of the grooves from the main air hole is greater than the overall circumferential spacing of the grooves from the exhaust hole.

3. The handheld gas-driven medical device according to claim 1, Characterized in that, The number of the grooves is 3 - 150.

4. The handheld gas-driven medical device according to claim 1, Characterized in that, The arc length corresponding to the circumferential spacing between the centers of any two adjacent grooves is not greater than half of the circumference.

5. The handheld gas-driven medical device according to any one of claims 1 - 4, Characterized in that, The axial length of the grooves is less than 10 mm, and each groove is a continuous or discontinuous straight groove parallel to the axis of the housing.

6. The handheld gas-driven medical device according to any one of claims 1 - 4, Characterized in that, The axial length of the grooves is less than 10 mm, and each groove is a continuous or discontinuous inclined groove inclined at a certain angle with respect to the axis of the housing.

7. The handheld gas-driven medical device according to any one of claims 1 - 4, Characterized in that, The axial length of the grooves is less than 10 mm, and each groove is a spiral groove extending spirally along the wall surface of the receiving cavity.

8. The handheld gas-driven medical device according to claim 1, Characterized in that, The radial cross-section of the grooves is circular arc-shaped, parabolic-shaped, triangular-shaped, trapezoidal-shaped or irregular-shaped.

9. The handheld gas-driven medical device according to claim 7, Characterized in that, The wall surface of the grooves is circular arc-shaped, and the corresponding arc radius is greater than the radial depth of the grooves.

Images