Multifunctional bedside limb supporting frame for interventional operation

Abstract

The utility model discloses a multifunctional bedside limb support frame for interventional operation, which comprises a support seat, the support seat comprises a left support seat and a right support seat, the bottom end of the right side of the left support seat is provided with a big-end-down taper hole, the bottom end of the left side of the right support seat is fixedly provided with an extension plate, the extension plate is fixedly provided with a taper block which is matched with the taper hole in an inserted manner, and the taper block is fixedly connected with the left support seat. First compression springs are installed on the inner side and the outer side of the conical block, first insertion holes are formed in the inner end and the outer end of the conical hole, insertion rods matched with the first insertion holes in an inserted mode are inserted into the inner side and the outer side of the conical block, second insertion holes communicated with the first insertion holes are formed in the inner end and the outer end of the left support, and push rods are inserted into the two second insertion holes; second compression springs are mounted on the inner side and the outer side of the left support; the supporting seat is ingenious in structural design, the supporting seat can be divided into two parts to be used for supporting a left arm and a right arm respectively in an interventional operation, the two parts can be combined together to be used for supporting a leg in a lithotomy position of fallopian tube recanalization together with a leg support, and the supporting seat is worthy of popularization and application.

Description

TECHNICAL FIELD

[0001] The utility model relates to a supporting field especially to a multifunctional bedside four-limb support frame for interventional operation. BACKGROUND

[0002] Since the interventional operation is different from the ordinary surgical operation, it is accepted by more and more patients because of small incision and fast recovery, and the operation approach is to treat by means of human physiological duct, and the most commonly used one is four-limb blood vessel; therefore, the patient's four limbs need to be placed in different positions when puncturing these blood vessels, and it is required that the operation is convenient and the patient's four limbs are comfortable; since the interventional operation is completed under X-ray, the operation bed for interventional operation is also different from the surgical operation bed, and is generally made of non-metal carbon fiber, synthetic resin material and high molecular engineering plastic, so that the bedside four-limb support frame should also be different from the traditional metal support frame, and is made of non-metal material to support the four limbs in multiple functions; in combination with the feedback requirements of the operation doctors and patients, there is an urgent need for a multifunctional bedside four-limb support frame for interventional operation, which is mainly used for supporting the upper limbs when puncturing the left and right radial arteries in the cardiac coronary intervention operation, and supporting the double lower limbs in the lithotomy position when performing the oviduct recanalization operation.

[0003] The utility model discloses a kind of adjustable medical support frames, the support frame includes base, lifting adjusting assembly and support assembly, support assembly is connected with the base by the lifting adjusting assembly, support assembly includes support shell and telescopic piece, support shell is fixedly connected with the lifting adjusting assembly, support shell is provided with telescopic slot with one side opening, the first end of telescopic piece can be through the opening and enter the telescopic slot, the second end of telescopic piece is provided with positioning plate. The support frame is single function, cannot realize the multi-purpose of arm support or leg support in interventional operation. UTILITY MODEL CONTENTS

[0004] The utility model solves the above-mentioned prior art defects, and provides a multifunctional bedside four-limb support frame for interventional operation, which can flexibly support arms and legs, and meets the demand of supporting multiple purposes with one item in interventional operation.

[0005] The utility model discloses a technical scheme that solves its technical problems: this interventional operation multifunctional bedside four limbs support frame, including support seat, support seat is " U " shape, and support seat includes left part support and right part support, and the right side bottom end of left part support is opened the taper hole of big below small, and the left side bottom end of right part support is fixed with the extension plate, and the extension plate is fixed with the taper block of taper hole insertion allocation together, and the inside and outside of taper hole are equipped with the first jack hole that opens on left part support, and the inside and outside of taper block are inserted with the insertion rod that first jack hole insertion allocation together, and the head of two insertion rods is spherical, and the inside and outside of taper block is installed with the first compression spring of making insertion rod outwardly remove, and the inside and outside of left part support is opened with the second jack hole that first jack hole is communicated, and the second jack hole on two is inserted with push rod, and first jack hole and second jack hole are coaxial and the diameter size is consistent, and the inside and outside of left part support is installed with the second compression spring of making push rod outwardly remove, and the top surface outside of left part support and right part support is opened with three first round jack holes that are interval arrangement, and the inside of the top surface of left part support and right part support is opened with two second round jack holes that are interval arrangement, and support seat is equipped with leg support, and leg support includes the rod body, and the bottom end of rod body is fixed with round insertion rod, and the top end of rod body is fixed with arc-shaped tray, and round insertion rod is equipped with ball, and round insertion rod is opened with the radial hole of preventing ball and exporting, and radial hole is installed with third compression spring, and left part support, push rod, first compression spring, second compression spring, right part support, extension plate, taper block, insertion rod, rod body, round insertion rod, ball, third compression spring, arc-shaped tray all adopt high molecule engineering plastics material quality to make, the effect of support seat including left part support and right part support is, can conveniently be used for the support of left and right radial artery puncture when coronary intervention operation, the effect of taper hole, extension plate, taper block, first jack hole, insertion rod, spherical, first compression spring, second jack hole, push rod, second compression spring is, left part support and right part support can be assembled and fixed together or disassembled apart quickly and conveniently, the working principle of left part support and right part support quick disassembly is: press the push rod of both sides, and the push rod of both sides presses insertion rod and removes until two push rods cannot press (when this, second compression spring has been pressed and compressed limit limit), when the spherical head of insertion rod is located at the most inside end of first jack hole, then the taper block is broken away from the taper hole, when the spherical head end is extruded through the edge of the most inside end of first jack hole, will continue to shrink back, thereby from the taper hole (such as Figure 9As shown), this allows for quick separation of the left and right supports. The leg support, the first circular insertion hole, and the second circular insertion hole enable the patient's leg to be positioned using the leg support during lithotomy. The positioning angle can be adjusted by rotating the leg support and inserting it into different positions of the first and second circular insertion holes (adjusted according to the patient's height and leg length). The circular insertion rod, the ball, the radial hole, and the third compression spring ensure a secure connection to the leg support, preventing it from easily slipping out of the first circular insertion hole. The second circular insertion hole is dislodged, and the leg support rotation damping is generated to prevent the leg support from rotating randomly. Only by manually applying force to rotate the leg support can the leg support be deflected at an angle. Here, the support base, left support, push rod, first compression spring, second compression spring, right support, extension plate, cone block, insertion rod, spherical, leg support, circular insertion rod, spherical, third compression spring, and arc-shaped tray are all made of high-polymer engineering plastic material. The purpose is to enable the patient's arms and legs to be supported during media surgery under X-ray without affecting the surgical operation.

[0006] Further improvements include a cylinder body with a square-section insertion hole inside. A round rod is inserted into the cylinder body, and a plug block inserted into the insertion hole is fixed at the bottom of the round rod. A tray is fixed at the top of the round rod, and a rack is installed on the round rod. A first rotating shaft is rotatably connected to the cylinder body, and a gear meshing with the rack is fixed on the first rotating shaft. A first bevel gear is fixed on the outside of the first rotating shaft. A second rotating shaft is rotatably connected to the cylinder body, and a second bevel gear meshing with the first bevel gear is fixed on the second rotating shaft. A worm gear is fixed at the outer end of the second rotating shaft. A third rotating shaft is rotatably connected to the cylinder body, and a worm meshing with the worm gear is rotatably connected to the side end of the third rotating shaft. A universal coupling is installed between the worm and the third rotating shaft, and a hand crank is fixed at the outer end of the third rotating shaft. The cylinder block, insertion hole, round rod, insertion block, rack, first rotating shaft, gear, first bevel gear, second rotating shaft, second bevel gear, worm gear, universal coupling, and hand crank are used to raise and lower the round rod, thereby raising and lowering the arc-shaped tray to accommodate the leg placement of patients of different heights during lithotomy surgery. The working principle of raising and lowering the arc-shaped tray is as follows: Cranking the hand crank rotates the third rotating shaft, which in turn drives the worm gear through the universal coupling, thus rotating the worm gear, which in turn drives the second rotating shaft, which in turn drives the second bevel gear. The rotation of the second bevel gear synchronously drives the first bevel gear, which in turn drives the first rotating shaft. The rotation of the first shaft synchronously drives the gear to rotate, which in turn drives the rack to move, thus moving the round rod up and down, and simultaneously moving the arc-shaped tray up and down. The worm gear here has a one-way self-locking property, meaning that only the hand crank can move the arc-shaped tray up and down; the tray will not move on its own due to external gravity, ensuring the reliability of the arc-shaped tray in supporting the patient's leg. The cylinder, round rod, insert block, rack, first shaft, gear, first bevel gear, second shaft, second bevel gear, worm gear, third shaft, worm, hand crank, and universal coupling are all made of high-polymer engineering plastic. This is to ensure that the procedure can be performed under X-ray guidance while supporting the patient's leg, without affecting the surgical operation.

[0007] Further improvements include a self-lubricating layer made of polytetrafluoroethylene (PTFE) on the outer contour of the insert block, and a self-lubricating bushing made of PTFE at the through-hole of the cylinder. The self-lubricating layer reduces frictional resistance when the insert block moves across the through-hole surface, resulting in smoother operation and preventing jamming. Similarly, the self-lubricating bushing minimizes frictional resistance and ensures smooth operation of the rod during movement and contact with the cylinder through-hole, also preventing jamming.

[0008] Further improvements include the addition of soft padding on the top of both the support base and the tray. This padding ensures a soft contact when the patient's arms are resting on the left and right supports, preventing a harsh or cold feeling, especially in winter. It also provides a soft contact when the legs are supported on the curved tray, making leg support more comfortable and preventing coldness in winter. The padding is made of soft silicone material to allow for successful surgery under X-ray guidance without interfering with the procedure.

[0009] Further improvements include the addition of height markings on the cylindrical rod. These height markings clearly indicate the height of the rod, providing data for leg support during the lithotomy position in fallopian tube recanalization surgery, thus facilitating convenient use for patients of different heights.

[0010] The beneficial effects of this utility model are:

[0011] 1) The support base can be disassembled into two parts, which can be used as supports for the left and right arms respectively, thus facilitating the support for left and right radial artery puncture during coronary intervention surgery;

[0012] 2) When combined, they can be used for leg support in the lithotomy position during fallopian tube recanalization.

[0013] 3) It can be flexibly adjusted according to the physiological curvature of the limbs of different patients, so as to meet the position required for surgery and ensure that the patient will not experience limb discomfort due to prolonged surgery;

[0014] 4) It can improve surgical efficiency. A standard surgical position can increase the surgeon's puncture success rate and ensure the smooth passage of surgical instruments. Attached Figure Description

[0015] Figure 1 The three-dimensional representation of this utility model Figure 1 ;

[0016] Figure 2 This is a three-dimensional view from another side of the present invention. Figure 2 ;

[0017] Figure 3 for Figure 1 A schematic diagram of the AA cross-section;

[0018] Figure 4 for Figure 1 BB cross-sectional diagram;

[0019] Figure 5 for Figure 2 A schematic diagram of the CC cross-section;

[0020] Figure 6 forFigure 2 DD cross-sectional schematic diagram;

[0021] Figure 7 for Figure 2 EE cross-sectional schematic diagram;

[0022] Figure 8 for Figure 5 A magnified view of a portion of region F;

[0023] Figure 9 This is a flowchart illustrating the working principle of the cone block disengaging from the cone hole in this utility model.

[0024] Explanation of reference numerals in the attached drawings: Support base 1, left support 1-1, conical hole 1-1a, first insertion hole 1-1b, second insertion hole 1-1c, push rod 1-1d, second compression spring 1-1e, right support 1-2, extension plate 1-2a, conical block 1-2b, insertion rod 1-2c, spherical shape 1a-2c, first compression spring 1-2d, first round insertion hole 1-3, second round insertion hole 1-4, leg bracket 2, rod body 2-1, cylinder body 2-1a, insertion hole 2a-1a, self-lubricating bushing 2b-1a, round rod 2-1b. Insert block 2a-1b, self-lubricating layer 2ab-1b, rack 2b-1b, height scale mark 2c-1b, first rotating shaft 2-1c, gear 2a-1c, first bevel gear 2-1d, second rotating shaft 2-1e, second bevel gear 2a-1e, worm gear 2b-1e, third rotating shaft 2-1f, worm 2a-1f, hand crank 2-1g, universal coupling 2-1h, round insert rod 2-2, ball 2-2a, radial hole 2-2b, third compression spring 2-2c, arc-shaped tray 2-3, soft pad 3. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] Referring to the attached diagram: This multifunctional bedside limb support frame for interventional surgery includes a support base 1, which is U-shaped. The support base 1 includes a left support 1-1 and a right support 1-2. The right bottom of the left support 1-1 has a conical hole 1-1a, wider at the bottom and narrower at the top. An extension plate 1-2a is fixed to the left bottom of the right support 1-2. A conical block 1-2b, which mates with the conical hole 1-1a, is fixed on the extension plate 1-2a. Both the inner and outer ends of the conical hole 1-1a have first insertion holes 1-1b on the left support 1-1. Insertion rods 1-2c, which mate with the first insertion holes 1-1b, are inserted into the inner and outer sides of the conical block 1-2b, respectively. The ends of rods 1-2c are all spherical 1a-2c. First compression springs 1-2d are installed on the inner and outer sides of the cone blocks 1-2b to move the insert rods 1-2c outwards. The inner and outer ends of the left support 1-1 each have second insertion holes 1-1c that communicate with the first insertion hole 1-1b. The first insertion hole 1-1b and the second insertion hole 1-1c are coaxial and have the same diameter. Push rods 1-1d are inserted into both second insertion holes 1-1c. Second compression springs 1-1e are installed on the inner and outer sides of the left support 1-1 to move the push rods 1-1d outwards. Three spaced-apart first circular insertion holes 1-3 are opened on the outer top surface of the left support 1-1 and the right support 1-2. The top inner surfaces of the left support 1-1 and the right support 1-2 have two spaced-apart second circular insertion holes 1-4; the support base 1 is provided with a leg bracket 2, which includes a rod 2-1, a circular insertion rod 2-2 fixed at the bottom end of the rod 2-1, and an arc-shaped tray 2-3 fixed at the top end of the rod 2-1. A ball 2-2a is provided on the circular insertion rod 2-2, and a radial hole 2-2 is provided on the circular insertion rod 2-2 to prevent the ball 2-2a from falling out. b. A third compression spring 2-2c is installed in the radial hole 2-2b; the left support 1-1, push rod 1-1d, first compression spring 1-2d, second compression spring 1-1e, right support 1-2, extension plate 1-2a, cone block 1-2b, insert rod 1-2c, rod body 2-1, round insert rod 2-2, sphere 2-2a, third compression spring 2-2c, and arc-shaped tray 2-3 are all made of high-polymer engineering plastic material.

[0027] The rod body 2-1 includes a cylinder body 2-1a, with a square-section insertion hole 2a-1a inside the cylinder body 2-1a. A round rod 2-1b is inserted into the cylinder body 2-1a, and a plug block 2a-1b is fixed to the bottom of the round rod 2-1b, which is inserted into the insertion hole 2a-1a. A tray 2-3 is fixed to the top of the round rod 2-1b. A rack 2b-1b is provided on the round rod 2-1b. A first rotating shaft 2-1c is rotatably connected to the cylinder body 2-1a. A gear 2a-1c that meshes with the rack 2b-1b is fixed on the first rotating shaft 2-1c. A first bevel gear is fixed to the outside of the first rotating shaft 2-1c. 2-1d, A second rotating shaft 2-1e is rotatably connected to the cylinder body 2-1a. A second bevel gear 2a-1e that meshes with the first bevel gear 2-1d is fixed on the second rotating shaft 2-1e. A worm gear 2b-1e is fixed to the outer end of the second rotating shaft 2-1e. A third rotating shaft 2-1f is rotatably connected to the cylinder body 2-1a. A worm 2a-1f that meshes with the worm gear 2b-1e is rotatably connected to the side end of the third rotating shaft 2-1f. A universal coupling 2-1h is installed between the worm 2a-1f and the third rotating shaft 2-1f. A hand crank 2-1g is fixed to the outer end of the third rotating shaft 2-1f.

[0028] The outer contour of the insert 2a-1b is provided with a self-lubricating layer 2ab-1b made of polytetrafluoroethylene, and the perforation of the cylinder 2-1a is provided with a self-lubricating bushing 2b-1a made of polytetrafluoroethylene.

[0029] The top of the support base 1 and the trays 2-3 are all fitted with soft pads 3.

[0030] The round rod 2-1b is provided with a height scale mark 2c-1b.

[0031] The working principle of this utility model is as follows: The left support 1-1 and the right support 1-2 can be separated into two parts, which serve as supports for the left and right hands respectively, for supporting the left and right radial artery punctures during coronary intervention surgery (the leg support 2 can also be inserted into the first round insertion hole 1-3 and the second round insertion hole 1-4 on the separated left support 1-1 and right support 1-2, so that the left and right arms rest on the arc-shaped tray 2-3 for support operation); together with the leg support 2, it can be used to support the legs in the lithotomy position during fallopian tube recanalization surgery; it can be flexibly adjusted according to the physiological structure of the limbs of different patients, which not only meets the position required for surgery but also ensures that the patient will not experience limb discomfort due to prolonged surgery; it can improve surgical efficiency, and a standard surgical position can improve the surgeon's puncture success rate and ensure the smooth passage of surgical instruments.

[0032] The working principle of quick disassembly of the left support 1-1 and the right support 1-2 is as follows: Press the push rods 1-1d on both sides by hand. The push rods 1-1d will press the insert rod 1-2c inward until the two push rods 1-1d can no longer be pressed (at this point, the second compression spring 1-1e can no longer be compressed). At this time, the spherical head 1a-2c of the insert rod 1-2c is located at the innermost end of the first insertion hole 1-1b. Then, pry the right support 1-2 to disengage the cone block 1-2b from the cone hole 1-1a. At this time, the spherical head 1a-2c is squeezed by the edge of the innermost end of the first insertion hole 1-1b and will continue to retract, thus disengaging from the cone hole 1-1a (as shown). Figure 9 As shown in the figure, the left support 1-1 and the right support 1-2 can be quickly separated.

[0033] The working principle of the quick assembly of the left support 1-1 and the right support 1-2 is as follows: simply press the two insert rods 1-2c on both sides inward to compress and store energy in the first compression spring 1-2d. Then, the insert rods 1-2c are pressed into the conical hole 1-1a until the conical block 1-2b is fully engaged in the conical hole 1-1a. At this time, the insert rods 1-2c on both sides are quickly inserted into the first insertion hole 1-1b due to the restoring force of the first compression spring 1-2d, thereby quickly assembling and fixing the left support 1-1 and the right support 1-2 together.

[0034] The working principle of the arc-shaped tray 2-3 for lifting and lowering is as follows: Cranking the hand crank 2-1g causes the third rotating shaft 2-1f to rotate. This rotational force, transmitted through the universal coupling 2-1h, drives the worm gear 2a-1f to rotate, which in turn drives the worm wheel 2b-1e to rotate. This, in turn, drives the second rotating shaft 2-1e to rotate, which in turn drives the second bevel gear 2a-1e to rotate. The rotation of the second bevel gear 2a-1e synchronously drives the first bevel gear 2-1d to rotate, which in turn drives the first rotating shaft 2-1c to rotate. The rotation of the first rotating shaft 2-1c synchronously drives the gear 2a-1c to rotate, which in turn drives the rack 2b-1b to move. This, in turn, moves the round rod 2-1b up and down, synchronously moving the arc-shaped tray 2-3 up and down.

[0035] Here, the components are: support 1, left support 1-1, push rod 1-1d, second compression spring 1-1e, right support 1-2, extension plate 1-2a, cone block 1-2b, insert rod 1-2c, first compression spring 1-2d, first round insertion hole 1-3, second round insertion hole 1-4, leg bracket 2, rod body 2-1, cylinder body 2-1a, round rod 2-1b, insert block 2a-1b, rack 2b-1b, first rotating shaft 2-1c, gear 2a-1c, and first bevel gear 2. -1d, second shaft 2-1e, second bevel gear 2a-1e, worm gear 2b-1e, third shaft 2-1f, worm 2a-1f, hand crank 2-1g, universal coupling 2-1h, round insert rod 2-2, round ball 2-2a, third compression spring 2-2c, and arc-shaped tray 2-3 are all made of high-polymer engineering plastic material. The purpose is to enable the patient's arms and legs to be supported during media surgery under X-ray without affecting the surgical operation.

[0036] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A multifunctional bedside limb support frame for interventional surgery, comprising a support base (1), wherein the support base (1) is U-shaped, characterized in that: The support base (1) includes a left support (1-1) and a right support (1-2). The bottom right side of the left support (1-1) has a conical hole (1-1a) that is wider at the bottom and narrower at the top. The bottom left side of the right support (1-2) has an extension plate (1-2a) fixed thereon. A conical block (1-2b) that fits into the conical hole (1-1a) is fixed on the extension plate (1-2a). The inner and outer ends of the conical hole (1-1a) are provided with first insertion holes (1-1b) on the left support (1-1). The inner and outer sides of the conical block (1-2b) are respectively inserted into the first insertion holes (1-1b). The two insert rods (1-2c) are inserted together, and the ends of both insert rods (1-2c) are spherical (1a-2c). The inner and outer sides of the cone block (1-2b) are equipped with first compression springs (1-2d) that move the insert rods (1-2c) outward. The inner and outer ends of the left support (1-1) are opened with second insertion holes (1-1c) that communicate with the first insertion hole (1-1b). Push rods (1-1d) are inserted into the two second insertion holes (1-1c). The inner and outer sides of the left support (1-1) are equipped with second compression springs (1-1e) that move the push rods (1-1d) outward. The top outer surfaces of the left support (1-1) and the right support (1-2) have three spaced first circular insertion holes (1-3), and the top inner surfaces of the left support (1-1) and the right support (1-2) have two spaced second circular insertion holes (1-4). The support base (1) is provided with a leg bracket (2), the leg bracket (2) includes a rod (2-1), a round insert rod (2-2) is fixed at the bottom end of the rod (2-1), an arc-shaped tray (2-3) is fixed at the top end of the rod (2-1), a ball (2-2a) is provided on the round insert rod (2-2), a radial hole (2-2b) is opened on the round insert rod (2-2) to prevent the ball (2-2a) from falling out, and a third compression spring (2-2c) is installed in the radial hole (2-2b). The left support (1-1), push rod (1-1d), first compression spring (1-2d), second compression spring (1-1e), right support (1-2), extension plate (1-2a), cone block (1-2b), insertion rod (1-2c), rod body (2-1), round insertion rod (2-2), sphere (2-2a), third compression spring (2-2c), and arc-shaped tray (2-3) are all made of high-polymer engineering plastic material.

2. The multifunctional bedside limb support frame for interventional surgery according to claim 1, characterized in that: The rod body (2-1) includes a cylinder body (2-1a), which has a square-section insertion hole (2a-1a) inside. A round rod (2-1b) is inserted into the cylinder body (2-1a), and a plug (2a-1b) is fixed to the bottom of the round rod (2-1b) and inserted into the insertion hole (2a-1a). The tray (2-3) is fixed to the top of the round rod (2-1b), and a rack (2b-1b) is provided on the round rod (2-1b). A first rotating shaft (2-1c) is rotatably connected to the cylinder body (2-1a), and a gear (2a-1c) that meshes with the rack (2b-1b) is fixed on the first rotating shaft (2-1c). A first... A bevel gear (2-1d) is provided. A second shaft (2-1e) is rotatably connected to the cylinder (2-1a). A second bevel gear (2a-1e) that meshes with the first bevel gear (2-1d) is fixed on the second shaft (2-1e). A worm gear (2b-1e) is fixed to the outer end of the second shaft (2-1e). A third shaft (2-1f) is rotatably connected to the cylinder (2-1a). A worm (2a-1f) that meshes with the worm gear (2b-1e) is rotatably connected to the side end of the third shaft (2-1f). A universal coupling (2-1h) is installed between the worm (2a-1f) and the third shaft (2-1f). A hand crank (2-1g) is fixed to the outer end of the third shaft (2-1f).

3. The multifunctional bedside limb support frame for interventional surgery according to claim 2, characterized in that: The outer contour of the insert (2a-1b) is provided with a self-lubricating layer (2ab-1b) made of polytetrafluoroethylene, and the perforation of the cylinder (2-1a) is provided with a self-lubricating bushing (2b-1a) made of polytetrafluoroethylene.

4. The multifunctional bedside limb support frame for interventional surgery according to claim 1, characterized in that: The top of both the support base (1) and the tray (2-3) is fitted with a soft pad (3).

5. A multifunctional bedside limb support frame for interventional surgery according to claim 2, characterized in that: The round rod (2-1b) is provided with height scale markings (2c-1b).

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