Radiotherapy positioning device

Abstract

According to the radiotherapy positioning device, through the innovative design of the fixing pin, the fixing pin can be easily inserted and taken out by a single hand, and the operation difficulty and the working intensity of medical staff are greatly reduced. The fixing pin adopts a spring reset and unlocking sleeve structure, can be automatically locked when being inserted, and can be easily unlocked by pressing down a pressing plate when being taken out, and the positioning pin does not need to be pulled out forcefully, so that the abrasion of the positioning pin is effectively avoided, and the accuracy and the stability of radiotherapy positioning are ensured. In addition, the frame positioning holes of the radiotherapy positioning device are designed by combining counter bores and first through holes, and are tightly matched with second through holes and fixing pins of the base, so that the firmness of connection is further enhanced. Meanwhile, the elastic cushion is additionally arranged at the bottom of the pressing block, so that connection between the radiotherapy positioning diaphragm and the base is more stable and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to radiotherapy auxiliary instrument technical field, specifically is a radiotherapy positioning device. BACKGROUND

[0002] The radiotherapy positioning device is composed of a radiotherapy positioning film and a base corresponding thereto. The radiotherapy positioning film is a fixed product made of a high molecular material, which has been widely used in the radiotherapy positioning process in the medical field due to its unique performance advantages. The radiotherapy positioning film is composed of a thermoplastic film sheet and a frame. The thermoplastic film sheet can maintain a certain hardness and stability at room temperature, but can be deformed in hot water at about 60 degrees, showing strong plasticity. This thermoplasticity allows the radiotherapy positioning film to be customized according to the patient's body shape to achieve precise radiotherapy positioning. The fixing method of the radiotherapy positioning film is usually to pass the positioning pin through the fixing hole on the frame, and then lock with the base. This fixing method not only ensures the stability during radiotherapy, but also improves the accuracy of treatment. However, the existing fixing method of the radiotherapy positioning film sheet and the base has some problems. When the medical staff need to fix the radiotherapy positioning film sheet and the base together, they need to press the positioning pin with force so that it can pass through the fixing hole of the radiotherapy positioning film sheet and the base, realizing the locking of the two. When it is necessary to separate the radiotherapy positioning film sheet and the base, it is necessary to pull out the positioning pin with more force. In this process, the medical staff need to press the frame of the radiotherapy positioning film sheet with one hand to prevent it from moving, and the other hand needs to pull out the positioning pin upward with force. However, due to the design of the positioning pin and the material properties of the radiotherapy positioning film sheet, it is often difficult to exert force when pulling out the positioning pin upward, resulting in time-consuming and laborious operation and low work efficiency. In addition, the positioning pin is easily worn out during repeated insertion and extraction with great force, which may affect the accuracy and stability of radiotherapy positioning. Therefore, it is urgent to provide a more efficient and convenient radiotherapy positioning device to improve the above problems. SUMMARY

[0003] The utility model aims at providing a radiotherapy positioning device, which can improve the problems of complicated operation, low efficiency and easy wear of the positioning pin during the fixing and separating process of the radiotherapy positioning film sheet and the base in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a radiotherapy positioning device comprising a radiotherapy positioning membrane, a base, and a fixing pin. The radiotherapy positioning membrane is composed of a low-temperature thermoplastic film and a frame. Multiple positioning holes are formed on the frame, and multiple second through holes are formed on the base. Each second through hole corresponds to one of the positioning holes. Each positioning hole consists of a countersunk hole and a first through hole, with the countersunk hole having a larger diameter than the first through hole. The second through hole has the same diameter as the first through hole. The fixing pin comprises a pin sleeve, a pin shaft, and a pressure block. A first nut is installed at the upper end of the pin shaft, a pressure block fixing rod is horizontally installed in the middle of the pin shaft, and a disc-shaped locking head is installed at the lower end of the pin shaft. The diameter of the first nut is larger than the diameter of the pin shaft. A pin sleeve is installed on the outer periphery of the pin shaft, and the upper end of the pin sleeve is provided with... The pressure plate has a first nut cavity in its middle, which mates with a first nut. Two strip holes are formed on the side wall of the pressure plate. The two ends of the pressure block fixing rod extend out of the strip holes respectively, and a pressure block is installed on each end. The pressure block mates with a countersunk hole. An unlocking sleeve is installed at the bottom of the pin sleeve. The inner diameter of the unlocking sleeve is larger than the outer diameter of the locking head, and the outer diameter of the unlocking sleeve is smaller than the diameter of the second through hole. A first spring is installed on the outer circumference of the pin shaft, and the first spring is located between the locking head and the pin sleeve. A locking mechanism is horizontally installed at the bottom of the base. The locking mechanism consists of a housing, a locking tongue, and a second spring. The locking tongue and the second spring are installed in the first cavity of the housing. A side hole is formed on the side of the second through hole corresponding to the locking mechanism. The outer end of the locking tongue can enter the second through hole through the side hole and mate with the locking head.

[0005] The bottom of the locking head is conical.

[0006] The housing also has a second cavity, which is separated from the first cavity by a baffle. The inner end of the locking tongue is provided with a connecting rod, the second spring is located outside the connecting rod, and the outer end of the connecting rod passes into the second cavity to install the second nut.

[0007] The bottom of the pressure block is provided with an elastic pad.

[0008] The pressure block is semi-circular, and the straight edge of the pressure block is provided with a socket, a plug and a semi-circular groove, with the socket and plug located on both sides of the semi-circular groove.

[0009] Each of the two locking mechanisms is installed on both sides of the second through hole, and the two locking mechanisms are symmetrically distributed about the axis of the second through hole.

[0010] The base is provided with a cover plate at the bottom, and a cover plate hole is provided on the cover plate, which is connected to the second through hole.

[0011] The positive effect of the utility model lies in: the fixing and separating process of the radiotherapy positioning membrane and the base is obviously optimized, and the operation convenience and efficiency are improved. The device realizes the insertion and removal of the fixing pin by the innovative fixing pin design, and the operation difficulty and work intensity of medical staff are greatly reduced. The fixing pin adopts the spring reset and unlocking sleeve structure, can be automatically locked when being inserted, and is easily unlocked by pressing the pressing plate when being removed, without the need of forcibly pulling out, effectively avoiding the wear of the positioning pin, and ensuring the accuracy and stability of the radiotherapy positioning. In addition, the frame positioning hole of the radiotherapy positioning device adopts the combination design of the counterbore and the first through hole, is closely matched with the second through hole of the base and the fixing pin, and further enhances the firmness of the connection. Meanwhile, the elastic pad is additionally arranged at the bottom of the pressing block, so that the connection between the radiotherapy positioning membrane and the base is more stable and reliable. In summary, the radiotherapy positioning device has the characteristics of simple operation, stable connection, wear resistance and durability, effectively improves the accuracy and efficiency of the radiotherapy positioning, and provides a more reliable auxiliary instrument for the radiotherapy. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the perspective view of the radiotherapy positioning device, and the radiotherapy positioning membrane 1 and the base 2 are fixed together through a plurality of fixing pins 3;

[0013] Figure 2 It is the structure schematic view of the frame 13 and the base 2 fixedly matched through the fixing pin 3, and the figure is in the locked state;

[0014] Figure 3 It is the structure schematic view of the frame 13 and the base 2 fixedly matched through the fixing pin 3, and the figure is in the unlocked state;

[0015] Figure 4 It is the top view of the two pressing blocks 35 inserted and matched into the disc shape.

[0016] REFERENCE SIGNS:

[0017] 1 radiotherapy positioning membrane

[0018] 10 counterbore, 11 first through hole, 12 low-temperature thermoplastic membrane, 13 frame;

[0019] 2 base

[0020] 20 second through hole, 21 cover plate, 22 cover plate hole, 23 side hole;

[0021] 3 fixing pin

[0022] 30 pin sleeve 31 pressing plate 310 first nut cavity 32 pin shaft 33 bar hole 34 first nut 35 pressing block 350 elastic pad 351 jack 352 plug 353 semicircular groove 36 pressing block fixing rod 37 unlocking sleeve 38 locking head 39 first spring

[0023] 4 locking mechanism

[0024] 40 housing 41 first cavity 42 lock tongue 43 connecting rod 44 second cavity 45 second nut 46 second spring DETAILED DESCRIPTION

[0025] The utility model aims at providing a radiotherapy positioning device, the following further description of the utility model is combined with specific embodiment.

[0026] As Figure 1 The radiotherapy positioning device is composed of a radiotherapy positioning film 1, a base 2 and a fixing pin 3. The radiotherapy positioning film 1 is composed of a low-temperature thermoplastic film piece 12 and a frame 13. As Figure 2As shown, the frame 13 is provided with a plurality of positioning holes, and the base 2 is provided with a plurality of second through holes 20 corresponding to the positioning holes. The second through holes 20 and the positioning holes are connected and fixed by a fixing pin 3. Each positioning hole is composed of a counterbore 10 and a first through hole 11. The diameter of the counterbore 10 is larger than that of the first through hole 11, and the diameter of the second through hole 20 is the same as that of the first through hole 11. The fixing pin 3 is composed of a pin sleeve 30, a pin shaft 32 and a pressing block 35. The upper end of the pin shaft 32 is provided with a first nut 34, the middle part of the pin shaft 32 is horizontally provided with a pressing block fixing rod 36, and the lower end of the pin shaft 32 is provided with a disc-shaped locking head 38. The diameter of the first nut 34 is larger than that of the pin shaft 32, so as to limit the upper limit position of the pin sleeve 30. In order to reduce the difficulty of processing and assembly, thereby reducing the production cost of the positioning device, the locking head 38 and the first nut 34 can be respectively screwed with both ends of the pin shaft 32. This design can also adjust the relative position of the first nut 34 and the pin shaft 32 by rotating the first nut 34, so as to adjust the initial elastic force of the first spring 39. The outer periphery of the pin shaft 32 is provided with the pin sleeve 30, and the pin sleeve 30 can slide up and down along the pin shaft 32. The upper end of the pin sleeve 30 is provided with a pressing plate 31, and the middle part of the pressing plate 31 is provided with a first nut cavity 310 matched with the first nut 34. Two strip-shaped holes 33 are formed in the side wall of the pressing plate 31. The both ends of the pressing block fixing rod 36 respectively extend out of the strip-shaped holes 33 and are respectively provided with a pressing block 35. The pressing block 35 is matched with the counterbore 10 to lock the position of the base 2. The bottom of the pin sleeve 30 is provided with an unlocking sleeve 37, the inner diameter of the unlocking sleeve 37 is larger than the outer diameter of the locking head 38, and the outer diameter of the unlocking sleeve 37 is smaller than the diameter of the second through hole 20. The unlocking sleeve 37 can slide in the second through hole 20 and guide the fixing pin 3. The outer periphery of the pin shaft 32 is provided with the first spring 39, and the first spring 39 is located between the locking head 38 and the pin sleeve 30, and has a restoring function for the pin sleeve 30. The bottom of the base 2 is horizontally provided with a locking mechanism 4. The locking mechanism 4 is composed of a shell 40, a locking tongue 42 and a second spring 46. The locking tongue 42 and the second spring 46 are installed in the first cavity 41 of the shell 40. The side corresponding to the locking mechanism 4 of the second through hole 20 is provided with a side hole 23. The outer end of the locking tongue 42 can enter the second through hole 20 through the side hole 23 and be matched with the locking head 38.

[0027] The use method is that the radiotherapy positioning film 1 is heated in hot water, and the operation steps of covering the radiotherapy positioning film 1 on the head and neck of the patient are the same as the existing method. When the frame 13 is matched with the base 2, and the second through hole 20 is matched with the positioning hole, the fixing pin 3 is inserted into the channel formed by the second through hole 20 and the positioning hole, and then the palm presses the pressing plate 31 and the first nut 34, in the process, the locking head 38 is matched with the inclined surface of the locking tongue 42, the locking tongue 42 is pushed into the first cavity 41 to overcome the elastic force of the second spring 46; when the upper surface of the locking head 38 is below the locking tongue 42, the locking tongue 42 is reset under the action of the second spring 46, so as to lock the locking head 38. At this time, the pressing block 35 also presses the bottom surface of the counterbore 10, so as to lock the frame 13 and the base 2 together. In this way, the channels formed by the other second through holes 20 and the positioning holes are inserted into the locking by the fixing pin 3 one by one, that is, the radiotherapy positioning film 1 and the base 2 are locked together.

[0028] When the radiotherapy positioning film 1 and the base 2 need to be separated, the fixing pin 3 can be smoothly taken out by one hand, without the need to pull it up, and the specific operation is as follows: the index finger and the thumb of one hand press the pressing plate 31 downward, after the pressing plate 31 drives the pin sleeve 30 to move downward relative to the pin shaft 32, the first nut 34 is located outside the first nut cavity 310, and the index finger and the thumb can pinch the first nut 34 and the upper part of the pin shaft 32. During the downward movement of the pressing plate 31, on the one hand, the elastic force of the first spring 39 is overcome, and on the other hand, the pin sleeve 30 drives the unlocking sleeve 37 to push the locking tongue 42 into the first cavity 41, and the locking head 38 is covered as shown, so that the locking tongue 42 cannot be inserted into the space between the unlocking sleeve 37 and the locking head 38, at this time, the locking head 38 loses the constraint of the locking tongue 42, and only needs to be lifted upward to take out the fixing pin 3. Figure 3

[0029] The whole process of inserting and taking out the fixing pin 3 can be operated by one hand, the operation is more simple and smooth, and the working strength and difficulty of medical personnel can be effectively reduced.

[0030] In order to make the locking head 38 push the locking tongue 42 into the first cavity 41 more smoothly, the bottom of the locking head 38 is conical as shown. Figure 2 The conical side wall is matched with the inclined surface of the locking tongue 42, so that the operation is more smooth.

[0031] In order to make the locking tongue 42 work more stably, the following technical scheme can be used, as shown. Figure 2 ​As shown, the shell 40 also has a second cavity 44, which is separated from the first cavity 41 by a baffle, and the inner end of the lock tongue 42 is provided with a connecting rod 43, and the second spring 46 is located outside the connecting rod 43, and the outer end of the connecting rod 43 penetrates into the second cavity 44 to install the second nut 45. For the convenience of processing and assembly, the two ends of the connecting rod 43 can be respectively screwed with the second nut 45 and the lock tongue 42, and this design can also adjust the relative position of the second nut 45 and the first cavity 41 by rotating the second nut 45, so as to adjust the initial elastic force of the second spring 46.

[0032] In order to make the connection between the radiotherapy positioning film 1 and the base 2 more stable and firm, the bottom of the pressing block 35 is provided with an elastic pad 350, and after the fixing pin 3 is inserted into the radiotherapy positioning film 1 and the base 2, the elastic pad 350 has a certain elastic deformation.

[0033] In order to make the pressure of the pressing block 35 on the radiotherapy positioning film 1 more uniform, so as to further optimize the locking effect, as shown in the drawings, Figure 4 As shown, the pressing block 35 can be semicircular. The straight edge of the pressing block 35 is provided with a socket 351, a plug 352 and a semicircular groove 353. The socket 351 and the plug 352 are located on the two sides of the semicircular groove 353. Two pressing blocks 35 are butt-jointed into a circle, at this time, the hole formed by the two semicircular grooves 353 is located outside the pin sleeve 30, and the semicircular groove 353 is provided with a hole matched with the pressing block fixing rod 36. The socket 351 of one pressing block 35 and the plug 352 of the other pressing block 35 are matched and matched. The pressing block 35 and the pressing block fixing rod 36 can be made of engineering plastics or metal materials with appropriate strength and elasticity.

[0034] In order to make the locking more stable and firm, as shown in the drawings, Figure 2 As shown, each of the second through holes 20 is provided with a locking mechanism 4 on both sides, and the two locking mechanisms 4 are symmetrically distributed about the axis of the second through hole 20.

[0035] In order to facilitate the processing and assembly of the positioning device described in the present application, as shown in the drawings, Figure 2 As shown, the bottom of the base 2 is provided with a cover plate 21, and the cover plate 21 is provided with a cover plate hole 22, and the cover plate hole 22 is communicated with the second through hole 20. The cover plate 21 can be connected with the base 2 by bolts. When it is necessary to check or replace the locking mechanism 4, the cover plate 21 is only removed from the base 2, and the locking mechanism 4 can be taken out.

[0036] The technical scheme of the utility model is not limited to the scope of the embodiments described in the utility model. The technical contents not described in the utility model are all known technologies.

Claims

1. A radiotherapy positioning device, comprising a radiotherapy positioning membrane (1), a base (2), and a fixing pin (3), wherein the radiotherapy positioning membrane (1) comprises a low-temperature thermoplastic film (12) and a frame (13), the frame (13) having multiple positioning holes, and the base (2) having multiple second through holes (20), the second through holes (20) corresponding one-to-one with the positioning holes, characterized in that: Each positioning hole consists of a countersunk hole (10) and a first through hole (11). The diameter of the countersunk hole (10) is larger than the diameter of the first through hole (11). The diameter of the second through hole (20) is the same as that of the first through hole (11). The fixing pin (3) consists of a pin sleeve (30), a pin shaft (32), and a pressure block (35). A first nut (34) is installed on the upper end of the pin shaft (32). A pressure block fixing rod (36) is horizontally installed in the middle of the pin shaft (32). The lower end of the pin shaft (32) A disc-shaped locking head (38) is installed, and the diameter of the first nut (34) is larger than the diameter of the pin (32). A pin sleeve (30) is installed on the outer periphery of the pin (32), and a pressure plate (31) is provided at the upper end of the pin sleeve (30). A first nut cavity (310) is opened in the middle of the pressure plate (31), and the first nut cavity (310) cooperates with the first nut (34). Two strip holes (33) are opened on the side wall of the pressure plate (31), and the two ends of the pressure block fixing rod (36) extend out respectively. Outside the strip hole (33), a pressure block (35) is installed on each of them. The pressure block (35) cooperates with the countersunk hole (10). An unlocking sleeve (37) is installed at the bottom of the pin sleeve (30). The inner diameter of the unlocking sleeve (37) is larger than the outer diameter of the locking head (38). The outer diameter of the unlocking sleeve (37) is smaller than the diameter of the second through hole (20). A first spring (39) is installed on the outer periphery of the pin shaft (32). The first spring (39) is located between the locking head (38) and the pin sleeve (30). A locking mechanism (4) is horizontally installed at the bottom of the base (2). The locking mechanism (4) consists of a housing (40), a locking tongue (42), and a second spring (46). The locking tongue (42) and the second spring (46) are installed in the first cavity (41) of the housing (40). A side hole (23) is opened on the side of the second through hole (20) corresponding to the locking mechanism (4). The outer end of the locking tongue (42) can enter the second through hole (20) through the side hole (23) and cooperate with the locking head (38).

2. The radiotherapy positioning device according to claim 1, characterized in that: The bottom of the locking head (38) is conical.

3. The radiotherapy positioning device according to claim 1, characterized in that: The housing (40) also has a second cavity (44), which is separated from the first cavity (41) by a baffle. The inner end of the locking tongue (42) is provided with a connecting rod (43), and the second spring (46) is located outside the connecting rod (43). The outer end of the connecting rod (43) is inserted into the second cavity (44) to install the second nut (45).

4. The radiotherapy positioning device according to claim 1, characterized in that: The bottom of the pressure block (35) is provided with an elastic pad (350).

5. The radiotherapy positioning device according to claim 1, characterized in that: The pressure block (35) is semi-circular, and the straight edge of the pressure block (35) is provided with a socket (351), a plug (352) and a semi-circular groove (353). The socket (351) and the plug (352) are located on both sides of the semi-circular groove (353).

6. The radiotherapy positioning device according to claim 1, characterized in that: A locking mechanism (4) is installed on each side of the second through hole (20), and the two locking mechanisms (4) are symmetrically distributed about the axis of the second through hole (20).

7. The radiotherapy positioning device according to claim 1, characterized in that: The base (2) has a cover plate (21) at the bottom, and a cover plate hole (22) is opened on the cover plate (21). The cover plate hole (22) is connected to the second through hole (20).

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