CN106551697B - Measuring callipers - Google Patents
Measuring callipers Download PDFInfo
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- CN106551697B CN106551697B CN201510629222.4A CN201510629222A CN106551697B CN 106551697 B CN106551697 B CN 106551697B CN 201510629222 A CN201510629222 A CN 201510629222A CN 106551697 B CN106551697 B CN 106551697B
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- 238000000034 method Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 27
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 210000000988 bone and bone Anatomy 0.000 description 11
- 210000002303 tibia Anatomy 0.000 description 9
- 238000001356 surgical procedure Methods 0.000 description 8
- 239000012634 fragment Substances 0.000 description 7
- 210000000689 upper leg Anatomy 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 3
- 239000007943 implant Substances 0.000 description 3
- 208000012659 Joint disease Diseases 0.000 description 2
- 208000002193 Pain Diseases 0.000 description 2
- 206010003246 arthritis Diseases 0.000 description 2
- 210000000629 knee joint Anatomy 0.000 description 2
- 238000013150 knee replacement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 208000006820 Arthralgia Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002917 arthritic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000011540 hip replacement Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008407 joint function Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000004417 patella Anatomy 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000002271 resection Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1072—Measuring physical dimensions, e.g. size of the entire body or parts thereof measuring distances on the body, e.g. measuring length, height or thickness
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1075—Measuring physical dimensions, e.g. size of the entire body or parts thereof for measuring dimensions by non-invasive methods, e.g. for determining thickness of tissue layer
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The invention provides a measuring calliper, comprising: a ruler rod; a handle; a main scale head mounted on one end of the scale bar; a secondary scale head movably mounted on the scale bar between the primary scale head and the handle; the end face of the main ruler head is opposite to the end face of the auxiliary ruler head and is a plane; wherein said one end of said ruler has a pointed end at which said main ruler head is movably mounted on said ruler so that said pointed end can extend from or retract into said main ruler head. By using the measuring caliper and the measuring method thereof, the measuring mode can be selected according to the shape of the measured object, so that the switching is convenient, and the measuring result is more accurate.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a measuring caliper for joint replacement surgery.
Background
Arthritis has become a serious joint disorder in the elderly. Patients suffering from arthritis often have pain and cannot walk normally, and the quality of life is seriously affected. For arthritic patients who are not conservative, surgical treatment is a very effective way to radically relieve pain and restore joint mobility, especially for advanced, severe joint diseases.
In joint replacement surgery, the joint is replaced with an artificial implant, which for example for knee replacement surgery generally comprises a tibial, femoral and patellar portion. By means of artificial implants, the goals of relief of joint pain, improvement of joint function, correction of joint deformity and long-term stability can be achieved. However, the high complications after surgery present great psychological frustration to doctors and patients. Besides objective factors, an important cause of complications after operation is that the bone cutting process cannot be accurately positioned and measured, so that errors occur in measurement, judgment of doctors is affected, and the risk of operation failure is brought to patients. How to perform accurate osteotomies during surgery is a focus of attention for doctors and patients. For example, during joint replacement surgery, it is desirable to accurately measure the thickness of the femur or tibia fragment, the patella diameter, and the thickness, as well as the diameter of the femoral head, as measured by a doctor during hip replacement.
The prior osteotomy measurement generally adopts a measurement caliper, the head part of the measurement caliper is provided with two planes, the two planes are used for clamping an object, and the size of the object is measured through the moving distance of the auxiliary ruler. However, since the joint surface of the osteotomy has various shapes, such as a concave or abnormal shape, the caliper cannot be accurately positioned at a predetermined position of the osteotomy sheet when measuring the osteotomy sheet, and thus accurate measurement cannot be completed, resulting in a significant deviation of the measured bone sheet data from the actual value. Thus, based on inaccurate measurement data, it is impossible to determine whether the implant to be replaced corresponds to the size of the osteotomy piece, thereby affecting the progress of the operation and the rehabilitation of the patient after the operation.
Therefore, there is a need for a measuring caliper that can accommodate a variety of bone fragment shapes and that can more accurately measure osteotomy sizes.
Disclosure of Invention
The invention solves the problems of inaccurate measurement and poor adaptability of the existing measuring callipers, and provides the measuring callipers which have simple structure, convenient operation and wide adaptability and can realize accurate measurement and the method for measuring by using the measuring callipers. The measuring caliper can ensure accurate measurement of the osteotomy bone fragments in the joint replacement operation process, thereby greatly reducing the osteotomy quantity and reducing complications.
To this end, according to an aspect of the present invention, there is provided a measuring calliper comprising: a ruler rod; a handle; a main scale head mounted on one end of the scale bar; a secondary scale head movably mounted on the scale bar between the primary scale head and the handle; the end face of the main ruler head is opposite to the end face of the auxiliary ruler head and is a plane; wherein said one end of said ruler has a pointed end at which said main ruler head is movably mounted on said ruler so that said pointed end can extend from or retract into said main ruler head.
Preferably, the main scale head has a main scale head through hole, the auxiliary scale head has an auxiliary scale head through hole, and the main scale head moves on the scale bar through the main scale head through hole, and the auxiliary scale head moves on the scale bar through the auxiliary scale head through hole.
Preferably, the main scale head comprises a main scale head positioning pin and a main scale head pin hole, wherein in a locked state of the main scale head, the main scale head positioning pin is in the main scale head pin hole and abuts against the scale bar; the secondary head has a coupling portion coupled with the rule, the coupling portion including a secondary head locating pin and a secondary head pin hole, wherein in a locked state of the secondary head locating pin is within the secondary head pin hole and abuts the rule.
Preferably, the main gauge head positioning pin and the auxiliary gauge head positioning pin have external threads, and the main gauge head pin hole and the auxiliary gauge head pin hole are threaded holes.
Preferably, the rule has a slot adjacent the tip for locking the main rule head locating pin.
Preferably, the tip is conical or pyramidal.
Preferably, the other end of the ruler rod opposite to the tip is provided with a handle, and a plurality of circular arcs which are convenient to hold are arranged on the handle.
Preferably, the ruler rod is a J-shaped rod or an L-shaped rod.
According to another aspect of the present invention there is also provided a method of making a measurement using a measurement calliper as described above, the method comprising the steps of:
fixing a main scale head at the tip of a scale rod according to the shape of an object to be measured so as to enable the tip to be retracted in the main scale head, or fixing the main scale head away from the tip so as to enable the tip to be exposed;
sliding a secondary scale head over the scale bar away from the primary scale head to form a measurement gap between the primary or tip and the secondary scale head, respectively;
placing an object to be measured in the measuring gap, and pushing the auxiliary ruler head towards the main ruler head, so that the object to be measured is correspondingly contacted with the end face or the tip of the main ruler head and is contacted with the end face of the auxiliary ruler head;
fixing the secondary head to the rule;
and reading the scale indicated on the ruler rod.
Preferably, the object to be measured in the above method is an osteotomy piece.
The main scale head part of the measuring caliper is designed into a convertible structure, when the main scale head moves on the ruler rod to the position that the tip end retracts to the end face of the main scale head, the opposite end faces of the main scale head and the auxiliary scale head form a flat plate structure, and when the main scale head moves on the ruler rod to the position that the tip end extends out of the end face of the main scale head, the tip end of the ruler rod and the end face of the auxiliary scale head form a thimble structure. Thus, the measuring caliper of the present invention can be converted between a flat plate structure and a thimble structure. For example, during knee replacement surgery, the thickness of the femur is measured in a flat plate configuration, and the thickness of the tibia is measured in a thimble configuration.
Compared with the measuring calipers on the current market, such as the measuring calipers in the Depuy Sigma PFC knee joint surgical instrument and the measuring calipers in the Zimmer Nexgen knee joint surgical instrument, the main ruler head of the measuring calipers is of a convertible structure, and can switch between bone fragments of bone cutting at different positions during measurement, so that the time of a doctor in operation is saved, the measuring result of the bone cutting thickness is more accurate, and the quality of the operation is improved.
Drawings
FIG. 1 is a schematic front view of a measurement caliper according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the measurement caliper of FIG. 1 operating in a flat plate configuration;
FIG. 3 is a schematic illustration of the measurement caliper of FIG. 1 operating in a thimble configuration;
FIG. 4 is a left side partial cross-sectional view of the measurement caliper of FIG. 1;
fig. 5 is a right side partial cross-sectional view of the measuring caliper of fig. 1.
Detailed Description
A measuring calliper according to a preferred embodiment of the invention is described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these exemplary embodiments are not meant to be limiting in any way.
Fig. 1 is a schematic front view of a measuring calliper according to an embodiment of the invention. Fig. 1 shows a measuring calliper 1 comprising a rule 2, a main head 4, a secondary head 6 and a handle 30. The main head 4 is mounted on the rule 2 and the secondary head 6 is movably mounted on the rule 2, wherein the end face 12 of the main head 4 and the end face 14 of the secondary head 6 are opposite and planar. A handle 30 is mounted to the other end of the rule 2 with the secondary head 6 between the primary head 4 and the handle 30.
According to an embodiment of the present invention, the ruler 2 has a tip 16 at one end, and the main ruler head 4 is movably mounted at the tip 16 such that the tip 16 can be extended from the main ruler head 4 or retracted into the main ruler head 4, as shown in fig. 3 and 4. The tip 16 of the ruler 2 may be conical, pyramidal or any other pointed form. A groove 18 is also provided at the tip 16 of the rule 2. In addition, the ruler 2 is provided with scales in mm. When the measuring calliper 1 is in an unused state, the end face 12 of the primary head 4 and the end face 14 of the secondary head 6 are in contact, the scale on the ruler 2 being indicated as 0. The ruler 2 may be a J-bar, an L-bar or a conventional vernier caliper style. The handle 30 has a plurality of (e.g., four) circular arcs thereon to facilitate single-hand gripping.
According to an embodiment of the present invention, the main scale head 4 may have a main scale head through hole 20 for the passage of the scale bar 2 and a main scale head pin hole 24 for the passage of the main scale head positioning pin 8, such that the main scale head 4 may be moved over the scale bar 2 through the main scale head through hole 20 to enable the tip 16 to extend from or retract into the main scale head 4 from the main scale head 4 and may be secured to the scale bar 2 by the main scale head positioning pin 8. In addition to being movable by means of through holes, the main head 4 and the ruler 2 may also have matching guide and channel structures, so that the main head 4 can slide on the ruler 2.
According to an embodiment of the present invention, the sub-head 6 may have a coupling portion having a sub-head through hole 22 for the penetration of the rule 2 and a sub-head pin hole 26 for the penetration of the sub-head positioning pin 10, so that the sub-head 6 may be moved on the rule 2 through the sub-head through hole 22 and may be fixed on the rule 2 by the sub-head positioning pin 10. In fig. 1, 2 and 3, the sub-head 6 is shown in the form of a cylindrical, intermediate cylindrical rod connection at both ends, wherein one end of the sub-head 6 is a coupling portion having a sub-head through hole 22 and a sub-head pin hole 26, and the other end of the sub-head 6 has a measuring end face 14. Of course, the secondary blade 6 may also take other forms, such as the secondary blade 6 being of unitary shape. The secondary scale head 6 may be connected to a secondary scale 28, the secondary scale 28 indicating the distance between the primary scale head 4 or tip 16 and the secondary scale head 6, i.e. the thickness or diameter of the object being measured, as it moves over the scale bar 2. Of course, the auxiliary rule head 6 may not be connected with the auxiliary rule 28, and the connection part of the auxiliary rule head 6 and the rule rod 2 may function as the auxiliary rule. As with the main head 4, the auxiliary head 6 and the rule 2 may have matched guide rails and channels, in addition to being movable by means of through holes, so that the auxiliary head 6 can slide on the rule 2.
According to an embodiment of the present invention, the main gauge head positioning pin 8 and the main gauge head pin bore 24 are threaded, and the movement of the main gauge head positioning pin 8 within the main gauge head pin bore 24 is a helical movement, as shown in fig. 4 and 5. Similarly, the secondary blade locating pin 10 and secondary blade locating pin hole 26 are also threaded, and the secondary blade locating pin 10 movement within the secondary blade pin hole 26 is also a helical movement. Of course, the main gauge head locating pin 8 and the main gauge head locating pin bore 24 may have other forms, such as spring loaded locating pins and pin bores.
Referring to fig. 2, in accordance with one embodiment of the present invention, when measuring in a flat plate configuration, such as measuring the thickness of a femoral resection, the main gauge head 4 of the measuring caliper of the present invention is passed through the main gauge head locating pin 8 into the groove 18 on the gauge rod 2 within the main gauge head pin hole 24, securing the main gauge head 4 at the tip 16 of the gauge rod 2, as shown in fig. 4, with the tip 16 of the gauge rod 2 retracted into the main gauge head 4, i.e., not beyond the end face 12 of the main gauge head 4. Sliding the auxiliary ruler head 6, putting a femur osteotomy piece in a parallel gap between the main ruler head 4 and the auxiliary ruler head 6, pushing the auxiliary ruler head 6 towards the main ruler head 4 to enable the osteotomy surface and cambered surface of the femur osteotomy piece to be tangent with the end face 12 of the main ruler head 4 and the end face 14 of the auxiliary ruler head 6, and then fastening the auxiliary ruler positioning pin 10 to enable the auxiliary ruler head 6 to be fixed on the ruler rod 2, as shown in fig. 5. In this way, the scale on the ruler 2 indicated by the secondary ruler 28 can be read.
Referring to fig. 3, according to another embodiment of the present invention, when measuring in a thimble configuration, such as measuring tibial osteotomy plate thickness, the main gauge head 4 of the measuring caliper of the present invention is secured to the ruler 2 by withdrawing the main gauge head locating pin 8 from the groove 18 on the ruler 2 within the main gauge head pin hole 24 so that the main gauge head 4 can be moved away from the tip 16 of the ruler 2 until the tip 16 of the ruler 2 is exposed, and then tightening the main gauge head locating pin 8. As shown in fig. 3, the tip 16 of the rule 2 extends beyond the end face 7 of the main rule head 4. Sliding the auxiliary ruler head 6, putting a tibia osteotomy piece in a gap between the tip 16 and the auxiliary ruler head 6, enabling the tibia osteotomy surface to be in contact with the end face 14 of the auxiliary ruler head 6, enabling the tip 16 of the ruler rod 2 to be in contact with the lowest point of the cambered surface of the tibia osteotomy piece, and then fastening the auxiliary ruler positioning pin 10 to enable the auxiliary ruler head 6 to be fixed on the ruler rod 2. In this way, the scale on the ruler 2 indicated by the secondary ruler 28 can be read.
Referring to fig. 4, according to an embodiment of the present invention, the main scale 4 is secured at the tip 16 of the scale 2 by the main scale locating pin 8 snapping into a groove 18 on the scale 2, thereby ensuring that after the main scale 4 is located, the main scale 4 does not slip on the scale due to inadvertent manipulation or excessive force when clamping bone chips, affecting the measurement. In addition, as shown in fig. 4, when the main head 4 is fixedly positioned at the tip 16 of the rule 2, the apex of the tip 16 of the rule 2 is located behind the end face 12 of the main head 4 (in the pointing direction of the tip 16). Preferably, both the apex of the tip 16 and the end face 12 are flush. In this way, the graduations on the ruler 2 can be arranged for the same starting point. According to an embodiment of the present invention, when the main scale head 4 is slid into place on the scale bar, i.e., when the main scale head positioning pin 8 is aligned with the slot 18, a fixed positioning is achieved by threading the main scale head positioning pin 8 into the main scale head pin hole 24. When the main scale head 4 needs to be moved, the main scale head positioning pin 8 is screwed out of the main scale head pin hole 24 by a certain height and is withdrawn from the groove 18, and then the main scale head positioning pin 8 is screwed after being moved to a proper position, so that the main scale head positioning pin 8 abuts against the scale rod 2, and temporary fixation is realized. Of course, if the main gauge head positioning pin 8 is a spring-loaded positioning pin, the positioning pin is snapped into the slot using the spring force of the spring to achieve a fixed positioning. When the positioning pin needs to be moved and loosened, the spring-loaded positioning pin can be pulled up and then loosened after being moved to a proper position, and the positioning pin abuts against the ruler rod under the action of elasticity, so that temporary fixation is realized.
Referring to fig. 5, according to an embodiment of the present invention, the secondary head 6 is fixedly positioned on the rule 2 by a secondary head locating pin 10. Since the sub-head 6 is a movable head during the measurement, i.e. moves accordingly according to the size of the object being measured, the sub-head 6 is fixed by being pressed directly against the rule 2 using only the sub-head positioning pin 10, without providing a corresponding groove. Thus, when the sub-head 6 moves on the scale 2 to the end surfaces of the main head 4 and the sub-head 6, the sub-head 6 is fixed to the scale 2 by the sub-head positioning pin 10. In this way, the doctor or operator can easily read the measured value without fear that the sub-head 6 will slip to change the measured value. According to an embodiment of the present invention, for a threaded secondary head alignment pin 10 and secondary head pin hole 26, when it is desired that the secondary head 6 be moved over the rule 2, the secondary head alignment pin 10 may be unscrewed from contact with the rule 2. When the auxiliary ruler head 6 needs to be fixed, the auxiliary ruler head locating pin 10 can be screwed tightly to abut against the ruler rod 2 to achieve fixed location.
When the thickness of the osteotomy piece is measured by using the measuring caliper, the thickness is firstly determined according to the osteotomy type, and the thickness is measured in a flat plate structure mode or in a thimble structure mode. For example, when measuring the thickness of the femur osteotomy, a plate structure formed by combining the main gauge head 4 and the auxiliary gauge head 6 is used for measurement, and when measuring the thickness of the tibia osteotomy, a thimble structure formed by combining the tip 16 of the ruler 2 and the auxiliary gauge head 6 is used for measurement.
The method of measuring with the measuring callipers of the invention is illustrated below for both cases.
As shown in fig. 2 and described above, when the measuring caliper measures the thickness of the femoral osteotomy fragment, first, it is ensured that the main-gauge-head positioning pin 8 is inserted into the groove 18 of the ruler 2 and screwed into the main-gauge-head positioning pin 8, thus fixing the main gauge head 4; then, the auxiliary ruler head positioning pin 10 is loosened, so that the auxiliary ruler head 6 slides on the ruler rod far away from the main ruler head 4, a gap enough for conveniently placing the femur osteotomy fragment is formed between the main ruler head 4 and the auxiliary ruler head 6, and the bone fragment is placed; pushing the auxiliary ruler head 6 towards the main ruler head 4 to enable the osteotomy surface and the cambered surface of the femur osteotomy piece to be tangent with the end face 12 of the main ruler head 4 and the end face 14 of the auxiliary ruler head 6; screwing the auxiliary ruler head positioning pin 10 to fix the auxiliary ruler head 6 on the ruler rod 2; the scale is read.
As shown in fig. 3 and described above, when the caliper is measured for the thickness of the tibial osteotomy sheet, the main head positioning pin 8 is first released, the main head positioning pin 8 is withdrawn from the slot 18 of the ulrod 2 and moved away from the tip 16 of the ulrod 2, the tip 16 of the ulrod 2 is exposed, and the main head positioning pin 8 is screwed to secure the main head 4 to the ulrod 2 away from the tip 16; then, the auxiliary ruler head locating pin 10 is loosened, the auxiliary ruler head 6 slides on the ruler rod 2 far away from the tip 16 of the ruler rod 2, a gap which is enough for conveniently placing the tibia osteotomy bone slice is formed between the tip 16 and the auxiliary ruler head 6, and the bone slice is placed; pushing the auxiliary ruler head 6 towards the main ruler head 4 to enable the osteotomy surface of the tibia osteotomy piece to be in contact with the end face 14 of the auxiliary ruler head 6, and enabling the tip 16 of the ruler rod 2 to be in contact with the lowest point of the cambered surface of the tibia osteotomy piece; screwing the auxiliary ruler head positioning pin 10 to fix the auxiliary ruler head 6 on the ruler rod 2; the scale is read.
To protect the measuring callipers from unintentional damage or to ensure the measuring accuracy, the main head 4 and the auxiliary head 6 should be reset after the measurement is completed, i.e. the main head 4 is fixed at the tip 16 of the rule 2 by screwing the main head positioning pin 8 and the auxiliary head positioning pin 10, and the end face 14 of the auxiliary head 6 is fixed in contact with the end face 12 of the main head 4.
The measuring structure and the measuring mode adopted can be determined according to the shape of the measured object by using the measuring caliper and the measuring method, the switching is convenient, the operation time is saved, the measuring result is more accurate, and the operation quality is further improved.
The invention has been described in detail with reference to specific embodiments thereof. It will be apparent that the embodiments described above and shown in the drawings are to be understood as illustrative and not limiting of the invention. It will be apparent to those skilled in the art that various modifications or variations can be made in the present invention without departing from the spirit thereof, and that such modifications or variations do not depart from the scope of the invention.
Claims (10)
1. A measurement caliper, the measurement caliper comprising:
a ruler rod (2), wherein the ruler rod (2) is provided with scales;
a handle (30);
a main scale head (4), the main scale head (4) being mounted on one end of the scale bar (2);
a secondary rule head (6), said secondary rule head (6) being movably mounted on said rule (2) between said primary rule head (4) and said handle (30);
the end face (12) of the main ruler head (4) is opposite to the end face (14) of the auxiliary ruler head (6) and is a plane;
characterized in that said one end of said ruler bar (2) has a tip (16), said main ruler head (4) being movably mounted on said ruler bar (2) at said tip (16) so that said tip (16) can be extended from said main ruler head (4) or retracted into said main ruler head (4);
the main scale head (4) comprises a main scale head positioning pin (8) and a main scale head pin hole (24), wherein in a locking state of the main scale head (4), the main scale head positioning pin (8) is in the main scale head pin hole (24) and abuts against the scale rod (2).
2. Measuring calliper according to claim 1, wherein the main head (4) has a main head through hole (20), the auxiliary head (6) has an auxiliary head through hole (22), and the main head (4) is moved over the rule (2) through the main head through hole (20), and the auxiliary head (6) is moved over the rule (2) through the auxiliary head through hole (22).
3. Measuring calliper according to claim 2, wherein the secondary head (6) has a coupling part with the rule (2), the coupling part comprising a secondary head positioning pin (10) and a secondary head pin hole (26), wherein in the locked state of the secondary head (6) the secondary head positioning pin (10) is in the secondary head pin hole (26) and abuts the rule (2).
4. A measuring calliper according to claim 3, wherein the main head locating pin (8) and the auxiliary head locating pin (10) are externally threaded, and the main head pin hole (24) and the auxiliary head pin hole (26) are threaded holes.
5. A measuring calliper according to any of claims 1-4, wherein the ruler bar (2) has a groove (18) adjacent the tip (16) for locking the main gauge head positioning pin (8).
6. The measuring calliper according to claim 5, wherein the tip (16) is conical or pyramidal.
7. A calliper according to any of claims 1-4, wherein the other end of the ruler bar (2) opposite the tip (16) has a handle (30), the handle (30) having a plurality of circular arcs for easy gripping.
8. A measuring calliper according to any of claims 1-4, wherein the ruler bar (2) is a J-bar or an L-bar.
9. A method of making measurements using a measurement calliper according to any of claims 1-8, said method comprising the steps of:
according to the shape of the measured object, fixing a main scale head (4) at the tip (16) of the ruler rod (2) to enable the tip (16) to be retracted in the main scale head (4), or fixing the main scale head (4) away from the tip (16) to enable the tip (16) to be exposed;
sliding a secondary head (6) on the rule (2) away from the primary head (4) to form a measurement gap between the primary head (4) or the tip (16) and the secondary head (6), respectively;
placing an object to be measured in the measuring gap, pushing the auxiliary ruler head (6) towards the main ruler head (4) to enable the object to be measured to be in contact with the end face (12) or the tip (16) of the main ruler head (4) respectively and to be in contact with the end face (14) of the auxiliary ruler head (6);
-fixing the secondary head (6) to the shank (2);
and reading the scale indicated on the ruler rod (2).
10. The method of claim 9, wherein the object is an osteotomy piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510629222.4A CN106551697B (en) | 2015-09-28 | 2015-09-28 | Measuring callipers |
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| CN201510629222.4A CN106551697B (en) | 2015-09-28 | 2015-09-28 | Measuring callipers |
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| CN106551697A CN106551697A (en) | 2017-04-05 |
| CN106551697B true CN106551697B (en) | 2023-11-03 |
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| CN2442223Y (en) * | 2000-08-24 | 2001-08-08 | 天津钢管公司 | Electronic digital display wall thickness caliper with plain and curve probe |
| JP2003004437A (en) * | 2001-06-26 | 2003-01-08 | Honda Motor Co Ltd | Vernier calipers for measurement |
| CN201653339U (en) * | 2010-04-03 | 2010-11-24 | 任文 | External thread detector of taper thread |
| CN202255165U (en) * | 2011-09-23 | 2012-05-30 | 深圳市大富科技股份有限公司 | Vernier caliper |
| CN202452909U (en) * | 2012-03-05 | 2012-09-26 | 株洲精工硬质合金有限公司 | Micrometer for measuring depths of tanks and holes |
| CN203928932U (en) * | 2014-06-20 | 2014-11-05 | 金延恺 | With the Multifunctional absolute digimatic caliper of test probe replaceable support |
| CN104546234A (en) * | 2015-01-07 | 2015-04-29 | 北京爱康宜诚医疗器材股份有限公司 | Thighbone size measuring device |
| CN205006898U (en) * | 2015-09-28 | 2016-02-03 | 北京蒙太因医疗器械有限公司 | Measuring caliper |
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| CN106551697A (en) | 2017-04-05 |
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