A thickness measuring tool for knee joint pad replacement

Abstract

The present invention provides a thickness measuring tool for replacing a knee joint pad, comprising: a measuring base having two opposite ends, one end of which is suitable for being installed on a tibial prosthesis; a measuring pad having two opposite ends, one end of which is provided with a joint groove; the other end of the measuring base is connected to the other end of the measuring pad via a connecting structure; and at least one measuring plug-in can be inserted between the other end of the measuring base and the other end of the measuring pad to adjust the distance between the measuring base and the measuring pad. The thickness measuring tool of the present invention can provide a reference for the surgeon to select a genuine pad product of appropriate thickness, thereby improving the accuracy of selection, reducing waste of medical resources, reducing patient costs, and shortening operation time.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instruments for revision after knee replacement surgery, and in particular to a thickness measuring tool for replacing a knee joint gasket. Background Art

[0002] Total knee replacement significantly improves the knee joint function of patients with end-stage knee arthritis, relieves their pain, and improves their quality of life, but there is still a 1-3% chance of infection in clinical practice. Once infection occurs, early or acute postoperative infection requires partial revision of the knee joint, thorough debridement (removal of pus, hematoma, and organized tissue), and replacement of the knee joint pad.

[0003] During actual surgery, thorough debridement will lead to loose soft tissue around the knee joint, and the knee flexion and extension gap will be larger than before, which requires replacement of thicker knee joint gaskets. However, in current clinical operation tools, there is a lack of gap test pads suitable for placement between the installed real femoral and tibial prostheses. Doctors can only open the real gasket products to test them based on experience. The gasket products are sterile and cannot be used in clinical practice if they are not suitable. This leads to a waste of medical resources, increases patient costs, and prolongs the operation time. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the technical defects in the prior art that there is a lack of tools for measuring the size of the gap between the installed real femoral and tibial prostheses, and that there is no guidance for doctors to select the thickness of the knee gasket, thereby providing a thickness measurement tool for replacing the knee gasket.

[0005] To this end, the present invention provides a thickness measuring tool for knee joint pad replacement, comprising:

[0006] A measuring base having two opposite ends, one end of which is adapted to be mounted on the tibial prosthesis;

[0007] A measuring spacer having two opposite ends and one end having a joint groove;

[0008] The other end of the measuring base is connected to the other end of the measuring pad via a connecting structure;

[0009] At least one measuring plug-in can be inserted between the other end of the measuring base and the other end of the measuring pad to adjust the distance between the measuring base and the measuring pad.

[0010] As a preferred solution, the measurement plug-in includes: an insert;

[0011] The other end of the measuring base is provided with a first slot;

[0012] The other end of the measuring pad is provided with a second slot;

[0013] The first slot and the second slot are arranged opposite to each other to form a slot for installing the inserting strip.

[0014] As a preferred solution, the thickness of the insert is greater than the sum of the depths of the first slot and the second slot, and the difference is a set value.

[0015] As a preferred solution, the difference is marked on the measurement plug-in;

[0016] Alternatively, the depth value of the first slot is marked on the measuring base, the depth value of the second slot is marked on the measuring pad, and the thickness value of the insert is marked on the measuring plug-in.

[0017] As a preferred solution, after the measuring plug-in is inserted into the slot, the difference is at least one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, and 15mm.

[0018] As a preferred solution, the insertion end of the insert is a pointed end suitable for insertion.

[0019] As a preferred solution, the measuring plug-in is a U-shaped piece, comprising two inserting strips arranged in parallel, and a connecting strip connecting the two inserting strips; a first through hole is provided on the connecting strip.

[0020] As a preferred solution, a second through hole is provided on the measuring base; and the first through hole is located outside the second through hole.

[0021] As a preferred solution, the connection structure includes:

[0022] At least two connecting columns are arranged on the other end of the measuring base;

[0023] At least two connecting holes are arranged at the bottom of the joint groove of the measuring pad and are used for the connecting column to be plugged and connected.

[0024] As a preferred solution, one end of the measuring base is provided with a mounting protrusion suitable for being mounted inside a mounting groove of a tibial prosthesis.

[0025] The technical solution provided by the present invention has the following advantages:

[0026] 1. The thickness measuring tool for replacing a knee joint pad of the present invention comprises a measuring base, a measuring pad and a measuring plug-in, one end of the measuring base is suitable for being installed on a tibial prosthesis, one end of the measuring pad is provided with a joint groove, and the other end of the measuring base is connected to the other end of the measuring pad by a connecting structure; in a revision surgery, after a thorough debridement of the patient's knee joint part, the assembled measuring base and the measuring pad are first installed on the tibial prosthesis, the position is placed between the tibial prosthesis and the femoral prosthesis, and then measuring plug-ins of different thicknesses are inserted between the measuring base and the measuring pad. When a measuring plug-in of a certain thickness is inserted, and the tightness of the soft tissue of the knee joint is appropriate and the stability is good, the thickness of the combined measuring base, the measuring pad and the measuring plug-in of the thickness is calculated, thereby providing a reference for the surgeon to select a genuine gasket product of appropriate thickness, improve the accuracy of selection, reduce the waste of medical resources, reduce the cost of patients, and shorten the operation time.

[0027] 2. The thickness measuring tool for replacing the knee joint gasket of the present invention comprises a measuring plug-in including an insert strip, a first slot is provided on the other end of the measuring base, and a second slot is provided on the other end of the measuring gasket. The first slot and the second slot form a slot. After the insert strip is inserted, the upper and lower ends are respectively located inside the first slot and the second slot. By inserting insert strips of different thicknesses into the slot, the distance between the measuring base and the measuring gasket can be adjusted, which is very simple and convenient.

[0028] 3. The thickness measuring tool for replacing knee joint pads of the present invention has a thickness of the insert greater than the sum of the thicknesses of the first slot and the second slot, and the difference is a set value. When an insert of a suitable thickness is inserted so that the knee joint soft tissue has a suitable tightness and good stability, the sum of the thicknesses of the original measuring base and the measuring pad plus the difference is the thickness of the actual pad of suitable thickness.

[0029] 4. The thickness measuring tool for replacing knee joint pads of the present invention has a difference value marked on the measuring insert. When a certain insert of appropriate thickness is inserted so that the joint groove end of the measuring pad is at an appropriate distance from the femoral prosthesis, the sum of the thickness of the original measuring base and the measuring pad plus the difference value is the thickness of the actual pad of appropriate thickness.

[0030] Alternatively, the depth value of the first slot is marked on the measuring base, the depth value of the second slot is marked on the measuring gasket, and the thickness value of the insert is marked on the measuring plug-in. When an insert of appropriate thickness is inserted so that the soft tissue of the knee joint is of appropriate tightness and good stability, the sum of the thickness of the original measuring base and the measuring gasket, plus the thickness value of the insert, minus the depth value of the first slot and the depth value of the second slot, is the thickness of the actual gasket of appropriate thickness.

[0031] 5. In the thickness measuring tool for replacing knee joint pads of the present invention, the insertion end of the insert is a pointed end suitable for insertion. The advantage of providing the pointed end is that it is easy to insert.

[0032] 6. The thickness measuring tool for replacing the knee pad of the present invention has a U-shaped measuring insert, which includes two parallel inserts and a connecting strip connecting the two inserts; the U-shaped structure has two inserts, which can smoothly push the measuring base and the measuring pad apart after being inserted at the same time; the connecting strip of the U-shaped structure is easy to operate. Furthermore, a first through hole is provided on the connecting strip, which is convenient for operation after being clamped by surgical forceps.

[0033] 7. The thickness measuring tool for replacing the knee joint pad of the present invention has a second through hole on the measuring base, which is also convenient for clamping with surgical forceps to install the combined measuring base and measuring pad on the tibial prosthesis. The first through hole is located outside the second through hole to facilitate the surgical forceps to operate the measuring plug-in and the measuring base separately without interfering with each other.

[0034] 8. The thickness measuring tool for replacing a knee joint pad of the present invention has a connecting structure including a connecting column and a connecting hole. The hole and the column are movable together, which facilitates the relative movement of the measuring base and the measuring pad when the measuring plug-in is inserted. The connecting hole is arranged at the position of the joint groove, so that the measuring pad has a longer movable distance and is not easy to fall off.

[0035] 9. The measuring tool for replacing knee joint pads of the present invention has a mounting protrusion at one end of the measuring base, which is suitable for being mounted inside the mounting groove of the tibial prosthesis and is the same as the protrusion on the real pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the prior art or the specific implementation manner of the present invention, the drawings used in the description of the prior art or the specific implementation manner are briefly introduced below.

[0037] Figure 1 Schematic diagram of the structure of the tibial prosthesis.

[0038] Figure 2 It is a schematic diagram of the structure of a real gasket.

[0039] Figure 3 is a top view of the measuring base.

[0040] Figure 4 yes Figure 3 Bottom view of .

[0041] Figure 5 is a top view of the measuring gasket.

[0042] Figure 6 yes Figure 5 Bottom view of .

[0043] Figure 7 It is a schematic diagram of the structure of the measurement plug-in.

[0044] Figure numerals: 1. measuring base; 11. connecting column; 12. second through hole; 13. mounting protrusion; 2. measuring gasket; 21. joint groove; 22. connecting hole; 3. measuring plug-in; 31. inserting strip; 32. insertion end; 33. connecting strip; 34. first through hole; 4. tibial prosthesis; 41. mounting groove; 51. first slot; 52. second slot. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings.

[0046] Example

[0047] This embodiment provides a thickness measuring tool for knee joint pad replacement, such as Figure 1-7 As shown, it includes: a measuring base 1, having two opposite ends, one end of which is suitable for being installed on a tibial prosthesis 4; a measuring pad 2, having two opposite ends, one end of which is provided with a joint groove 21; the other end of the measuring base 1 and the other end of the measuring pad 2 are connected through a connecting structure; at least one measuring plug-in 3 can be inserted between the other end of the measuring base 1 and the other end of the measuring pad 2 to adjust the distance between the measuring base 1 and the measuring pad 2.

[0048] The measuring tool of this embodiment is used in revision surgery. After the patient's knee joint is thoroughly cleaned, the combined measuring base 1 and measuring gasket 2 are first installed on the tibial prosthesis 4 and placed between the tibial prosthesis 4 and the femoral prosthesis. Then, measuring plug-ins 3 of different thicknesses are inserted between the measuring base 1 and the measuring gasket 2. When the measuring plug-in 3 of a certain thickness is inserted and the knee joint soft tissue is loose and tight and has good stability, the thickness of the combination of the measuring base 1, the measuring gasket 2 and the measuring plug-in 3 of the thickness is calculated, thereby providing a reference for the surgeon to select a genuine gasket product of appropriate thickness, thereby improving the accuracy of selection, reducing the waste of medical resources, reducing patient costs, and shortening the operation time.

[0049] like Figure 3 , 6 As shown in Figures 7 and 8, the measuring plug-in 3 comprises: an inserting strip 31; a first slot 51 is provided at the other end of the measuring base 1; a second slot 52 is provided at the other end of the measuring pad 2; the first slot 51 and the second slot 52 are arranged opposite to each other to form a slot for installing the inserting strip 31. After the inserting strip 31 is inserted, the upper and lower ends are respectively located inside the first slot 51 and the second slot 52. By inserting inserting strips 31 of different thicknesses into the slots, the distance between the measuring base 1 and the measuring pad 2 can be adjusted, which is very simple and convenient.

[0050] The thickness of the insert 31 is greater than the sum of the depths of the first slot 51 and the second slot 52, and the difference is a set value. When an insert 31 of a suitable thickness is inserted, so that the soft tissue of the knee joint is appropriately tight and has good stability, the sum of the thicknesses of the original measuring base 1 and the measuring gasket 2 plus the difference is the thickness of the actual gasket of suitable thickness.

[0051] In this embodiment, the difference is marked on the measuring plug-in 3; when a strip 31 of appropriate thickness is inserted so that the soft tissue of the knee joint is appropriately tight and has good stability, the sum of the thicknesses of the original measuring base 1 and the measuring gasket 2 plus the difference is the thickness of the actual gasket of appropriate thickness.

[0052] As a variant design, the depth value of the first slot 51 is marked on the measuring base 1, the depth value of the second slot 52 is marked on the measuring pad 2, and the thickness value of the insert 31 is marked on the measuring plug 3. When an insert 31 of appropriate thickness is inserted so that the knee joint soft tissue is appropriately tight and has good stability, the sum of the original thickness of the measuring base 1 and the measuring pad 2 plus the thickness value of the insert 31 minus the depth value of the first slot 51 and the depth value of the second slot 52 is the thickness of the actual pad of appropriate thickness.

[0053] In this embodiment, after the measuring plug-in 3 is inserted into the slot, the difference is 6 mm. Those skilled in the art can set the difference to at least one of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, and 15 mm, and select according to needs during surgery.

[0054] like Figure 7 As shown, the insertion end 32 of the inserting strip 31 is a pointed end suitable for insertion. The benefit of providing a pointed end is that it facilitates insertion.

[0055] The measuring plug-in 3 is a U-shaped part, including two inserting strips 31 arranged in parallel, and a connecting strip 33 connecting the two inserting strips 31; a first through hole 34 is provided on the connecting strip 33. The U-shaped structure has two inserting strips 31, and after being inserted at the same time, the measuring base 1 and the measuring gasket 2 can be pushed open smoothly; the connecting strip 33 of the U-shaped structure is easy to operate. Furthermore, the first through hole 34 is provided on the connecting strip 33, which is convenient for operation after clamping with surgical forceps.

[0056] The measuring base 1 is provided with a second through hole 12, which is also convenient for clamping with surgical forceps to install the combined measuring base 1 and measuring gasket 2 on the tibial prosthesis 4; the first through hole 34 is located outside the second through hole 12 to facilitate the surgical forceps to operate the measuring plug-in 3 and the measuring base 1 separately without interfering with each other.

[0057] like Figure 3 , 5 As shown, the connection structure includes: at least two connection columns 11, which are arranged on the other end of the measuring base 1; at least two connection holes 22, which are arranged at the bottom of the joint groove 21 of the measuring pad 2, for the connection column 11 to be plugged in and connected. The hole and the column are matched in a movable manner, which facilitates the relative movement of the measuring base 1 and the measuring pad 2 when the measuring plug-in 3 is inserted; the connection hole 22 is arranged at the position of the joint groove 21, so that the measuring pad 2 has a longer movable distance and is not easy to fall off.

[0058] One end of the measuring base 1 is provided with a mounting protrusion 13 suitable for being mounted inside the mounting groove 41 of the tibial prosthesis 4, and the protrusion structure is the same as that on a real gasket.

[0059] The method of using the thickness measuring tool for knee joint pad replacement in this embodiment is as follows:

[0060] First, the assembled measuring base 1 and measuring gasket 2 are installed on the tibial prosthesis 4, and the position is placed between the tibial prosthesis 4 and the femoral prosthesis. Then, measuring plug-ins 3 of different thicknesses are inserted between the measuring base 1 and the measuring gasket 2. When the measuring plug-in 3 of a certain thickness is inserted, the tightness of the soft tissue of the knee joint is appropriate and the stability is good. The thickness of the combination of the measuring base 1, the measuring gasket 2 and the measuring plug-in 3 of the thickness is calculated, which is the appropriate thickness of the real gasket product.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A thickness measuring tool for knee joint pad replacement, characterized in that: include: A measuring base (1) having two opposite ends, one end of which is provided with a mounting protrusion (13) suitable for being mounted inside a mounting groove (41) of a tibial prosthesis (4); and the other end of the measuring base (1) is provided with a first slot (51); The measuring gasket (2) has two opposite ends, one end of which is provided with a joint groove (21); the other end of the measuring gasket (2) is provided with a second slot (52); the first slot (51) and the second slot (52) are arranged opposite to each other to form a slot for installing the insert (31); The other end of the measuring base (1) and the other end of the measuring pad (2) are connected via a connecting structure; At least one measuring plug-in (3), comprising the inserting strip (31), wherein the inserting strip (31) can be inserted into the slot to adjust the distance between the measuring base (1) and the measuring pad (2); The thickness of the insert (31) is greater than the sum of the depths of the first slot (51) and the second slot (52), and the difference is a set value; When the insert (31) of a suitable thickness is inserted so that the soft tissue of the knee joint is appropriately tight and has good stability, the sum of the thicknesses of the measuring base (1) and the measuring pad (2) plus the difference is the thickness of the actual pad of suitable thickness.

2. The thickness measuring tool according to claim 1, characterized in that: The difference is marked on the measurement plug-in (3); Alternatively, the depth value of the first slot (51) is marked on the measuring base (1), the depth value of the second slot (52) is marked on the measuring pad (2), and the thickness value of the insert (31) is marked on the measuring plug-in (3).

3. The thickness measuring tool according to claim 1, characterized in that: After the measuring plug-in (3) is inserted into the slot, the difference is at least one of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, and 15 mm.

4. The thickness measuring tool according to claim 1, characterized in that: The insertion end (32) of the insert (31) is a pointed end suitable for insertion.

5. The thickness measuring tool according to any one of claims 2 to 4, characterized in that: The measuring plug-in unit (3) is a U-shaped piece, comprising two inserting strips (31) arranged in parallel, and a connecting strip (33) connecting the two inserting strips (31); a first through hole (34) is provided on the connecting strip (33).

6. The thickness measuring tool according to claim 5, characterized in that: The measuring base (1) is provided with a second through hole (12); the first through hole (34) is located outside the second through hole (12).

7. The thickness measuring tool according to claim 1, characterized in that: The connection structure comprises: At least two connecting columns (11) are arranged on the other end of the measuring base (1); At least two connection holes (22) are provided at the bottom of the joint groove (21) of the measuring gasket (2) and are used for the connection column (11) to be plugged in and connected.

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