Auxiliary positioning device for temperature measuring optical fiber in vaginal cavity
By designing an intravaginal temperature measurement fiber auxiliary positioning device including positioning columns, inflatable airbags and elastic hoops, the problem of excessively thin fibers not easy to fit and inaccurate positioning is solved, and accurate multi-point temperature measurement in the deep pelvic cavity of cervical cancer patients is achieved.
Patent Information
- Application Number
- CN202421286111.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The prior art When measuring the deep pelvic temperature in patients with cervical cancer, the optical fiber is too thin and difficult to fit the vaginal wall, it is easy to break and cannot be accurately positioned, resulting in poor temperature measurement effect.
An auxiliary positioning device for the vaginal cavity temperature measurement optical fiber is designed, including a positioning column assembly, an inflatable air bag, an air storage air bag and a medical check valve. The temperature measurement optical fiber is fixed through the fiber positioning groove and elastic hoop on the positioning column, and the positioning column is supported by the inflatable air bag to ensure that the optical fiber is in close contact with the inner wall of the vagina.
Real-time accurate multi-point temperature measurement of the diseased parts of cervical cancer patients is achieved, ensuring the sustainability and accuracy of the temperature measurement effect, while avoiding the problems of fiber breakage and inaccurate positioning.
Smart Images

Figure CN222942331U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical auxiliary equipment, in particular to an auxiliary positioning device for a temperature measuring optical fiber in a vaginal cavity. Background Art
[0002] At present, the deep pelvic temperature measurement method for cervical cancer patients is usually based on surface temperature measurement, and the temperature of deep areas in the body is estimated according to the model. Fiber optic temperature measuring instruments are widely used in various medical temperature measurement scenarios due to their good temperature measurement performance. The end of the temperature measuring optical fiber is in contact with the part to be measured, and the temperature characteristics and conductivity of the optical fiber are used to measure the temperature of the patient's vaginal wall.
[0003] However, the optical fiber is too thin to effectively fit the vaginal wall or cervix; on the other hand, the optical fiber is easily broken and damaged, which affects the temperature measurement effect and easily causes a waste of medical resources; at the same time, this method cannot accurately locate the temperature measurement position.
[0004] Therefore, it is necessary to provide an auxiliary positioning device for positioning and fixing the temperature measuring optical fiber so that it can be easily placed in the patient's body for multi-point temperature measurement and maintain a continuous temperature measurement effect. Utility Model Content
[0005] In view of the above analysis, the utility model aims to provide an auxiliary positioning device for a temperature measuring optical fiber in the vaginal cavity, so as to solve the problem that it is inconvenient to put the temperature measuring optical fiber into the body and cannot position the temperature when measuring the cervical temperature of the patient.
[0006] The purpose of this utility model is mainly achieved through the following technical solutions:
[0007] An auxiliary positioning device for a temperature measuring optical fiber in a vaginal cavity comprises: a positioning column assembly; the positioning column assembly comprises: a circular or elliptical positioning column body and an elastic hoop; four first optical fiber positioning grooves are arranged on the surface of the positioning column body, and the temperature measuring optical fiber is clamped and installed in the first optical fiber positioning grooves; the first optical fiber positioning grooves extend along the axis direction of the positioning column body itself; the four first optical fiber positioning grooves are distributed at 0°, 90°, 180° and 270° along the circumferential direction of the positioning column body; the elastic hoop is sleeved on the outside of the positioning column body and multiple temperature measuring optical fibers.
[0008] Furthermore, the positioning column body is provided with an annular first hoop ring slot and a second hoop ring slot; elastic hoop rings are installed in both the first hoop ring slot and the second hoop ring slot.
[0009] Furthermore, it also includes: an inflatable air tube, an air storage bag and a medical one-way valve; an inflatable air bag is arranged at the upper end of the positioning column body; an airway is arranged inside the positioning column body, one end of the airway is connected to the inflatable air bag, and the other end is connected to the inflatable air tube; a medical one-way valve is arranged on the inflatable air tube, and the end of the inflatable air tube is connected to the air storage bag; squeezing the air storage bag can press the internal gas into the inflatable air bag, so that the inflatable air bag expands.
[0010] Furthermore, the medical one-way valve only allows gas to flow from the gas storage bag to the inflation bag.
[0011] Furthermore, the first optical fiber positioning groove extends from the outer end of the positioning column body to the inflatable airbag.
[0012] Furthermore, a convex ring is provided in the middle of the positioning column body, and the convex ring smoothly transitions to the outer surface of the positioning column body.
[0013] The temperature measuring optical fibers are provided in two groups, each group having four fibers; the temperature measuring end of the first group of temperature measuring optical fibers is arranged in the middle of the inflatable airbag, and the temperature measuring end of the second group of temperature measuring optical fibers is arranged in the middle of the convex ring.
[0014] Furthermore, two groups of temperature measuring optical fibers are both clamped in the first optical fiber positioning groove, and two temperature measuring optical fibers located in the same first optical fiber positioning groove are overlapped.
[0015] Alternatively, a second optical fiber positioning groove is provided between two adjacent first optical fiber positioning grooves, and the first optical fiber positioning groove and the second optical fiber positioning groove are used to install two groups of temperature measuring optical fibers, respectively. The second optical fiber positioning groove extends from the end of the positioning column body to the surface of the convex ring.
[0016] Furthermore, a plurality of the convex rings are provided on the surface of the positioning column body, and the plurality of the convex rings are arranged in parallel along the axial direction of the positioning column body.
[0017] Furthermore, the first hoop groove is arranged on the side of the inflatable airbag, and the elastic hoop inside it can tighten the first group of temperature measuring optical fibers; the second hoop groove is arranged on both sides of the convex ring, and the elastic hoop inside it is used to tighten and position the second group of temperature measuring optical fibers.
[0018] Furthermore, the outer surface of the positioning column body is provided with length scale lines, which are used to indicate the depth of the positioning column inserted into the patient's body, ensure that the temperature measurement point is consistent with the treatment site, and facilitate timely observation of whether the positioning column is displaced, so that medical staff can adjust the position of the positioning column in a timely manner.
[0019] The technical solution of the utility model can achieve at least one of the following effects:
[0020] 1. The auxiliary positioning device of the temperature measuring optical fiber in the vaginal cavity of the utility model fixes multiple temperature measuring optical fibers in multiple optical fiber positioning grooves on the surface of the positioning column, and the four optical fiber positioning grooves are distributed at 0°, 90°, 180° and 270° in the circumferential direction of the surface of the positioning column. It can perform real-time and accurate multi-point temperature measurement on the diseased part of the cervical cancer patient, and then accurately know whether the patient's body temperature meets the standard, and ensure the treatment effect.
[0021] 2. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity of the utility model, by setting the positioning column to be cylindrical or elliptical, is convenient for placing it into the patient's body, and then convenient for placing multiple temperature measuring optical fibers positioned on its surface into the patient's body, thereby realizing multi-point temperature measurement deep inside the patient's body. During the temperature measurement process, the temperature measuring optical fiber is constrained by the optical fiber positioning groove and will not bend or deflected, which can effectively ensure the temperature measurement effect.
[0022] 3. The utility model provides an auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity. The inflatable airbag at the upper end of the positioning column is inflated by an air storage airbag. After the inflatable airbag is expanded, it can drive the temperature measuring optical fiber in the optical fiber fixing groove on its surface to contact the mucous membrane of the internal tissue of the human body, thereby achieving an accurate temperature measurement effect. At the same time, after the inflatable airbag is expanded, it can be supported on the inner surface of the vaginal wall, thereby preventing the positioning column from slipping out, thereby ensuring the stability of the temperature measurement position.
[0023] 4. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity of the utility model can clamp and fix multiple temperature measuring optical fibers by installing an elastic hoop in the hoop groove to prevent them from escaping from the optical fiber fixing groove, thereby ensuring the positioning effect of the temperature measuring optical fiber.
[0024] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.
[0026] Figure 1 It is an auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity of the utility model;
[0027] Figure 2 It is an enlarged schematic diagram of the positioning column of the auxiliary positioning device of the temperature measuring optical fiber in the vaginal cavity of the utility model;
[0028] Figure 3 It is a front view of the positioning column of the auxiliary positioning device of the temperature measuring optical fiber in the vaginal cavity of the utility model;
[0029] Figure 4 It is a cross-sectional effect diagram of the positioning column of the auxiliary positioning device of the temperature measuring optical fiber in the vaginal cavity of the utility model;
[0030] Figure 5 The utility model is a schematic diagram of the auxiliary positioning device of the temperature measuring optical fiber in the vaginal cavity in use.
[0031] Reference numerals:
[0032] 1-positioning column assembly; 2-inflatable air tube; 3-air storage bag; 4-medical one-way valve;
[0033] 101 - positioning column body; 102 - inflatable airbag; 103 - convex ring; 104 - first optical fiber positioning groove; 105 - first hoop groove; 106 - second hoop groove; 107 - airway. DETAILED DESCRIPTION
[0034] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.
[0035] Example 1
[0036] A specific embodiment of the utility model discloses an auxiliary positioning device for a temperature measuring optical fiber in a vaginal cavity, such as Figure 2 As shown, it includes: a positioning column component 1; the positioning column component 1 includes: a circular or elliptical positioning column body 101 and an elastic hoop; four first optical fiber positioning grooves 104 are arranged on the surface of the positioning column body 101, and the temperature measuring optical fiber is clamped and installed in the first optical fiber positioning groove 104; the first optical fiber positioning groove 104 extends along the axis direction of the positioning column body 101 itself; the four first optical fiber positioning grooves 104 are distributed at 0°, 90°, 180° and 270° along the circumferential direction of the positioning column body 101; the elastic hoop is sleeved on the outside of multiple temperature measuring optical fibers.
[0037] That is to say, when the positioning column body 101 is a cylindrical structure, the four first optical fiber positioning grooves 104 are arranged at equal intervals in the circumferential direction of the positioning column 1; when the positioning column body 101 is an elliptical column structure, the four first optical fiber positioning grooves 104 are arranged at the four end points of the elliptical cross-section of the positioning column 1.
[0038] Furthermore, at least two elastic hoops are provided.
[0039] Specifically, the positioning column body 101 is provided with an annular first hoop groove 105 and a second hoop groove 106; elastic hoop rings are installed in the first hoop groove 105 and the second hoop groove 106; the elastic hoop ring is sleeved on the outside of the positioning column body 101 and the temperature measuring optical fiber, and is used to tighten and position multiple temperature measuring optical fibers.
[0040] Preferably, the elastic hoop is made of medical rubber or medical silicone. When in use, after the temperature measuring optical fiber is snap-fitted into the optical fiber positioning groove, the elastic hoop is stretched open so that it is sleeved on the surface of the positioning column 1. The elastic hoop is moved to move it to the position of the first hoop groove 105 or the second hoop groove 106. The elastic hoop is snapped into the first hoop groove 105 or the second hoop groove 106 under the action of its own elastic force, and the temperature measuring optical fiber is clamped and fixed.
[0041] In the utility model, by setting a plurality of elastic hoops to locate the temperature measuring point at the end of the temperature measuring optical fiber, the temperature measuring optical fiber can be prevented from slipping along the axial direction of the positioning column body 101, thereby ensuring the accuracy of the temperature measuring position during the treatment process.
[0042] In a specific implementation of the utility model, Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, an inflatable airbag 102 is provided at the upper end of the positioning column body 101; an airway 107 is provided inside the positioning column body 101, one end of the airway 107 is connected to the inflatable airbag 102, and the other end is connected to the inflatable air tube 2; a medical one-way valve 4 is provided on the inflatable air tube 2, and the end of the inflatable air tube 2 is connected to the air storage bag 3; squeezing the air storage bag 3 can press the internal gas into the inflatable airbag 102, so that the inflatable airbag 102 expands.
[0043] Specifically, the medical one-way valve 4 only allows gas to flow from the gas storage bag 3 to the inflation bag 102 .
[0044] Specifically, Figure 4 As shown, the inflatable airbag 102 is an annular airbag. Correspondingly, the diameter of the positioning column body 101 at the position of the inflatable airbag 102 is reduced, so that the inflatable airbag 102 smoothly transitions with the outer surface of the positioning column body 101 in the uninflated state; after the inflatable airbag 102 is inflated, a convex annular structure protruding from the surface of the positioning column body 101 is formed.
[0045] Specifically, the air channel 107 and the inflatable airbag 102 are communicated and sealed; preferably, the inflatable airbag 102 is fixed to the positioning column body 101 by bonding.
[0046] In this embodiment, the positioning is performed by gradually inflating the inflatable airbag 102, which can reduce the discomfort of the patient during treatment. Preferably, in order to reduce the discomfort of the patient during treatment, the diameter of the positioning column body 101 and the diameter of the inflatable airbag 102 after inflation are not too large.
[0047] When in use, the air storage bag 3 is squeezed to press the gas therein into the inflatable bag 102 through the inflation tube 2, the medical one-way valve 4 and the airway 107, causing the inflatable bag 102 to expand. After the inflated air bag 102 expands, it can tighten the vaginal wall; on the one hand, it can fix the positioning column 1 to prevent the positioning column 1 from falling off or shifting, and on the other hand, it can cause the end temperature measuring point of the temperature measuring optical fiber on its surface to contact the inner wall of the vagina, thereby realizing accurate temperature measurement of the patient's lesion site.
[0048] Furthermore, if Figure 3 , Figure 5 As shown, the optical fiber positioning groove 104 extends from the outer end of the positioning column body 101 to the inflatable airbag 102. Specifically, the thickness of the inflatable airbag 102 is greater than the depth of the optical fiber positioning groove 104; the temperature measuring optical fiber is clamped and installed in the optical fiber positioning groove 104.
[0049] Furthermore, in order to accurately measure the temperature inside the patient's vaginal cavity, in this embodiment, a convex ring 103 is provided in the middle of the positioning column body 101, and the convex ring 103 smoothly transitions with the outer surface of the positioning column body 101. Figure 2 , Figure 3 , Figure 4 shown.
[0050] Furthermore, the temperature measuring optical fiber is provided in two groups, each group having four optical fibers; the temperature measuring end of the first group of temperature measuring optical fibers is arranged in the middle of the inflatable airbag 102, and the temperature measuring end of the second group of temperature measuring optical fibers is arranged in the middle of the convex ring 103. Preferably, the diameter of the convex ring 103 is smaller than the diameter of the inflatable airbag 102 after expansion, and larger than the diameter of the positioning column body 101. The convex ring 103 and the inflatable airbag 102 are arranged in parallel and spaced apart along the axial direction of the positioning column body 101, such as Figure 3 , Figure 4 , Figure 5 shown.
[0051] Furthermore, in order to meet the temperature measurement requirements at different depths, in this embodiment, multiple convex rings 103 are arranged in parallel in the axial direction of the positioning column 1; only one is shown in the figure. During implementation, the end of the second group of temperature measurement optical fibers is positioned on the surface of one of the convex rings 103 according to the different depth requirements of the temperature measurement.
[0052] Specifically, two groups of temperature measuring optical fibers are both clamped in the first optical fiber positioning groove 104, and the two temperature measuring optical fibers located in the same first optical fiber positioning groove 104 are overlapped; preferably, when two temperature measuring optical fibers of different lengths are arranged in the first optical fiber positioning groove 104, the first optical fiber positioning groove 104 is set as a step groove, that is, the depth of the first optical fiber positioning groove 104 between the end of the positioning column 1 and the convex ring 103 is greater than the depth of the part between the convex ring 103 and the inflatable airbag 102.
[0053] Alternatively, a second optical fiber positioning groove (not shown in the figure) is provided in the middle of two adjacent first optical fiber positioning grooves 104, and two groups of temperature measuring optical fibers are respectively installed in the first optical fiber positioning groove 104 and the second optical fiber positioning groove. Preferably, the first optical fiber positioning groove 104 and the second optical fiber positioning groove are spaced 45 degrees apart; that is, four first optical fiber positioning grooves 104 and four second optical fiber positioning grooves are provided, and are staggered in the circumferential direction of the positioning column body 101; the first optical fiber positioning groove 104 extends to the surface of the inflatable airbag 102, and is used to install the first group of temperature measuring optical fibers; the second optical fiber positioning groove extends to the surface of the convex ring 103, and is used to install the second group of temperature measuring optical fibers.
[0054] Preferably, a plurality of convex rings 103 are provided, and the second optical fiber positioning groove extends along the axial direction of the surface of the positioning column 1 and penetrates the surfaces of the plurality of convex rings 103. When in use, the temperature measuring optical fiber is clamped in the second optical fiber positioning groove, and the end of the temperature measuring optical fiber is arranged on the surface of the corresponding convex ring 103 according to the requirement of the temperature measuring depth.
[0055] That is to say, the temperature measuring end points of the four temperature measuring optical fibers of the first group of temperature measuring optical fibers are arranged in the middle of the inflatable airbag 102, such as Figure 3 , Figure 5 As shown, after the inflatable airbag 102 expands, it can drive the temperature measuring point to move, and then fit the inner wall of the patient's vagina to accurately measure the temperature of the lesion. The temperature measuring end points of the four temperature measuring optical fibers of the second group of temperature measuring optical fibers are set at the convex ring 103 position, which can measure the vaginal temperature at the convex ring 103 position; in this embodiment, a total of 8 temperature measuring points are set, which can comprehensively monitor the temperature of the lesion position and its surrounding environment.
[0056] Furthermore, when the inflatable airbag 102 and the convex ring 103 are provided on the surface of the positioning column 1, in order to facilitate the clamping and fixing of the first group of temperature measuring optical fibers and the second group of temperature measuring optical fibers; Figure 3 , Figure 4 , Figure 5 As shown, the first hoop groove 105 is arranged on the side of the inflatable airbag 102, and the elastic hoop inside it can tighten the first group of temperature measuring optical fibers; there are two second hoop grooves 106, which are respectively arranged on both sides of the convex ring 103, and the elastic hoop inside it is used to tighten and position the second group of temperature measuring optical fibers.
[0057] Furthermore, in order to facilitate observation of the depth of the positioning column 1 inserted into the vagina, length scale lines are provided on the outer surface of the positioning column body 101 in the utility model.
[0058] By observing the portion of the positioning column 1 reserved outside the body, medical staff can obtain the depth of the positioning column 1 inserted into the patient's body and then determine the position of the temperature measurement point; if the positioning column 1 is offset due to the patient's movement, it can be adjusted in time.
[0059] During implementation, first, two groups of temperature measuring optical fibers are inserted into the first optical fiber positioning groove 104 and / or the second optical fiber positioning groove, and the end position of the second group of temperature measuring optical fibers is adjusted according to the temperature measurement depth; then, an elastic hoop is put into the first hoop groove 105 and the second hoop groove 106 to prevent the temperature measuring optical fibers from moving out; further, the positioning column 1 is inserted into the patient's body, and the position of the inflatable airbag 102 is adjusted to be fixed; the temperature measuring optical fiber synchronous positioning column 1 is inserted into the patient's body, and the temperature measurement position is determined according to the scale position, so as to accurately monitor the temperature in the vagina; finally, the air storage airbag 3 is squeezed to press the gas into the inflatable airbag 102, so that the inflatable airbag 102 supports the vaginal wall tightly to prevent the positioning column 1 from shifting or sliding out, thereby ensuring the temperature measurement effect.
[0060] It is worth noting that: in order to ensure safety and hygiene in use, the auxiliary positioning device of the temperature measuring optical fiber in the vaginal cavity of the utility model is a disposable product; after the patient has used it once, the inflation tube 2 can be cut to release the air in the inflation bag 102, so as to facilitate the quick removal of the positioning column 1 as a whole.
[0061] The above is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.
Claims
1. An auxiliary positioning device for a temperature measuring optical fiber in a vaginal cavity, characterized in that: include: Positioning column assembly (1); The positioning column assembly (1) comprises: a circular or elliptical positioning column body (101) and an elastic hoop; Four first optical fiber positioning grooves (104) are arranged on the surface of the positioning column body (101), and the temperature measuring optical fiber can be snap-fitted and installed in the first optical fiber positioning grooves (104); the first optical fiber positioning grooves (104) extend along the axis direction of the positioning column body (101); the four first optical fiber positioning grooves (104) are distributed at 0°, 90°, 180° and 270° along the circumferential direction of the positioning column body (101); and the elastic hoop is sleeved on the outside of the positioning column body (101) and the plurality of temperature measuring optical fibers.
2. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 1, characterized in that: The positioning column body (101) is provided with an annular first hoop ring groove (105) and a second hoop ring groove (106); elastic hoop rings are installed in both the first hoop ring groove (105) and the second hoop ring groove (106).
3. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 2, characterized in that: Also includes: An inflatable air tube (2), an air storage bag (3) and a medical one-way valve (4); an inflatable air bag (102) is arranged at the upper end of the positioning column body (101); an airway (107) is arranged inside the positioning column body (101), one end of the airway (107) is connected to the inflatable air bag (102), and the other end is connected to the inflatable air tube (2); a medical one-way valve (4) is arranged on the inflatable air tube (2), and the end of the inflatable air tube (2) is connected to the air storage bag (3); squeezing the air storage bag (3) can press the internal gas into the inflatable air bag (102), so that the inflatable air bag (102) expands.
4. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 3, characterized in that: The medical one-way valve (4) only allows gas to flow from the gas storage bag (3) to the inflation bag (102).
5. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 4, characterized in that: The first optical fiber positioning groove (104) extends from the outer end of the positioning column body (101) to the inflatable airbag (102).
6. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 5, characterized in that: A convex ring (103) is provided in the middle of the positioning column body (101), and the convex ring (103) smoothly transitions with the outer surface of the positioning column body (101).
7. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 6, characterized in that: A second optical fiber positioning groove is arranged between two adjacent first optical fiber positioning grooves (104), and the first optical fiber positioning groove (104) and the second optical fiber positioning groove are respectively used to install two groups of temperature measuring optical fibers; the second optical fiber positioning groove extends from the end of the positioning column body (101) to the surface of the convex ring (103).
8. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 7, characterized in that: A plurality of the convex rings (103) are provided on the surface of the positioning column body (101), and the plurality of the convex rings (103) are arranged in parallel along the axial direction of the positioning column body (101).
9. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 8, characterized in that: The first hoop groove (105) is arranged on the side of the inflatable airbag (102), and the elastic hoop inside it can clamp the first group of temperature measuring optical fibers; the second hoop groove (106) is arranged on both sides of the convex ring (103), and the elastic hoop inside it is used to clamp and position the second group of temperature measuring optical fibers.
10. The auxiliary positioning device for the temperature measuring optical fiber in the vaginal cavity according to claim 1, characterized in that: The outer surface of the positioning column body (101) is provided with length scale lines.