Medullary drill for orthopedics department

Abstract

The utility model relates to the technical field of medical instruments, in particular to an orthopedic marrow opening drill which comprises a drill body, a positioning portion and a cutting portion. A positioning blade is arranged at one end of the positioning part, the other end of the positioning part is connected with the cutting part, and the diameter of the positioning blade is smaller than that of the positioning part; the cutting part comprises a first cutting sub-part and a second cutting sub-part, the first cutting sub-part is connected with the drill body, the second cutting sub-part is connected with the positioning part, the first cutting sub-part is of a cylindrical structure, and the diameter of the second cutting sub-part is gradually reduced in the feeding direction of the drill body. The positioning blade is arranged on the positioning portion, the diameter of the positioning blade is smaller than that of the positioning portion, positioning precision is improved, the drill bit is prevented from slipping during drilling, the drill bit with the smaller diameter in the front is convenient to position during drilling, resistance during drilling is reduced due to the design that the diameter of the cutting portion is gradually reduced in the feeding direction of the drill body, and drilling quality is improved. And the purpose of rapid punching is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an orthopedic medullary drill. Background Art

[0002] With the aging of China's population and the improvement of people's economic level, more and more patients with knee osteoarthritis require treatment due to pain and limited movement. In order to improve the quality of life, artificial knee replacement is an effective means to treat severe knee joint diseases. In the process of knee replacement, femoral medullary opening is a very important step. The implantation of femoral medullary opening directly affects the efficacy of the operation, so the tools used for implantation have become the key to artificial knee replacement surgery. At present, the commonly used femoral medullary opening adopts the drilling method. The resistance of the drill bit is large during drilling, and it takes a long time; and the drill bit is easy to slip, and it is difficult to position during drilling. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides an orthopedic medullary drill.

[0004] The utility model provides an orthopedic medullary drill, comprising a drill body, a positioning part and a cutting part;

[0005] A positioning blade is provided at one end of the positioning portion, and the other end of the positioning portion is connected to the cutting portion, and the diameter of the positioning blade is smaller than the diameter of the positioning portion;

[0006] The cutting part includes a first cutting sub-part and a second cutting sub-part, the first cutting sub-part is connected to the drill body, the second cutting sub-part is connected to the positioning part, the first cutting sub-part is a cylindrical structure, and the diameter of the second cutting sub-part gradually decreases along the feed direction of the drill body.

[0007] According to the utility model, an orthopedic medullary drill further comprises a first spiral chip groove provided on the outer peripheral side of the first cutting sub-portion along the feed direction of the drill body, wherein the first spiral chip groove is used for guiding and removing chips during the feeding process of the drill body.

[0008] According to the utility model, an orthopedic intramedullary drill also includes a second spiral chip groove and a first cutting edge provided on the outer peripheral side of the second cutting sub-portion along the feed direction of the drill body, the second spiral chip groove is adapted to the first cutting edge, and the second spiral chip groove is used to discharge bone chips generated by expanding the hole by the first cutting edge during the feeding process of the drill body.

[0009] According to the utility model, an orthopedic intramedullary drill also includes a third spiral chip groove and a second cutting edge provided on the outer peripheral side of the positioning portion along the feed direction of the drill body, the third spiral chip groove is adapted to the second cutting edge, and the third spiral chip groove is used to discharge bone chips generated by the positioning of the second cutting edge during the feeding process of the drill body.

[0010] According to the utility model, an orthopedic intramedullary drill also includes the first spiral chip groove chip removal input end connected to the second spiral chip groove chip removal output end, the first spiral chip grooves are arranged at radial intervals of 2 to 6 along the first cutting sub-portion, the second spiral chip grooves are arranged at radial intervals of 2 to 6 along the second cutting sub-portion, and the first spiral chip grooves are the same in number as the second spiral chip grooves, and the first spiral chip grooves and the second spiral chip grooves have the same helix angle, which is 60° to 80°.

[0011] According to the utility model, an orthopedic intramedullary drill further comprises 2 to 6 third spiral chip removal grooves spaced apart in the radial direction of the positioning portion, and the helix angle of the third spiral chip removal grooves is 60° to 80°.

[0012] According to an orthopedic intramedullary drill provided by the utility model, the diameter of the positioning portion is 3mm to 6mm, the length of the positioning portion is 5mm to 10mm, the total length of the first cutting sub-portion, the second cutting sub-portion and the positioning portion is 80mm to 120mm, and the length of the first cutting sub-portion is less than the length of the second cutting sub-portion.

[0013] According to the utility model, an orthopedic medullary drill is provided, wherein the number of cutting edges of the positioning blade is 2 to 4.

[0014] According to the utility model, an orthopedic medullary drill also includes a positioning portion whose diameter gradually decreases along the feed direction of the drill body, and a diameter of the positioning portion is the same as a diameter of the second cutting sub-portion at a connection between the second cutting sub-portion and the positioning portion.

[0015] According to the utility model, an orthopedic medullary drill further comprises a connection between the second cutting sub-portion and the positioning portion, and a diameter of the positioning portion is smaller than a diameter of the second cutting sub-portion.

[0016] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0017] The utility model is provided with a positioning blade on the positioning part, and the diameter of the positioning blade is smaller than the diameter of the positioning part, so as to improve the positioning accuracy and prevent the drill bit from slipping during drilling. The drill bit with a thinner diameter in front is convenient for positioning during drilling. The design of the cutting part gradually reducing the diameter along the feed direction of the drill body reduces the resistance during drilling, thereby achieving the purpose of fast drilling.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The utility model is a structural schematic diagram of a first embodiment of an orthopedic medullary drill provided by the utility model.

[0021] Figure 2 The utility model is a structural schematic diagram of a second embodiment of an orthopedic medullary drill provided by the utility model.

[0022] Reference numerals:

[0023] 1. Drill body; 2. First cutting sub-section; 3. Second cutting sub-section; 4. Positioning section; 5. Positioning blade. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The following embodiments are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0025] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0028] Combine the following Figure 1 to Figure 2 The utility model describes an orthopedic intramedullary drill. The utility model provides an orthopedic intramedullary drill, comprising a drill body 1, a positioning portion 4 and a cutting portion; a positioning blade 5 is provided on the positioning portion 4, and the diameter of the positioning blade 5 is smaller than the diameter of the positioning portion 4; the cutting portion comprises a first cutting sub-portion 2 and a second cutting sub-portion 3, the first cutting sub-portion 2 is a cylindrical structure, the second cutting sub-portion 3 is a conical structure, the diameter of the second cutting sub-portion 3 gradually decreases along the feed direction of the drill body, the first cutting sub-portion 2 is connected to the drill body 1, and the second cutting sub-portion 3 is connected to the positioning portion 4.

[0029] The design that the diameter of the positioning blade is smaller than the diameter of the positioning part improves the positioning accuracy and prevents the drill bit from slipping during drilling. The drill bit with a thinner diameter at the front is convenient for positioning during drilling. The design that the diameter of the cutting part gradually decreases along the feed direction of the drill body reduces the resistance during drilling and achieves the purpose of fast drilling.

[0030] Furthermore, a first spiral chip removal groove is provided on the outer peripheral side surface of the first cutting sub-portion 2 for guiding and removing chips during the feeding process of the drill body 1.

[0031] Furthermore, a second spiral chip groove and a first cutting edge are provided on the outer peripheral side of the second cutting sub-part 3. The first cutting edge is arranged on the edge of the second spiral chip groove. The first cutting edge expands the hole during the feeding process of the drill body, and the second spiral chip groove discharges bone chips generated during the expansion process of the first cutting edge.

[0032] Furthermore, a third spiral chip groove and a second cutting edge are provided on the outer peripheral side of the positioning portion 4. The second cutting edge is arranged on the edge of the third spiral chip groove. The second cutting edge positions the positioning edge during the feeding process of the drill body, and the third spiral chip groove discharges bone chips generated during the positioning process.

[0033] Furthermore, the chip input end of the first spiral chip groove is connected to the chip output end of the second spiral chip groove to form a connected spiral chip groove. The number of grooves of the first spiral chip groove is the same as the number of grooves of the second spiral chip groove, both of which are 2 to 6, and the helix angle is the same, both of which are 60° to 80°.

[0034] The number of the third spiral chip removal grooves is 2 to 6, and the helix angle is 60° to 80°.

[0035] Preferably, the number of grooves of the first spiral chip groove, the second spiral chip groove and the third spiral chip groove are all 4, and the helix angle is 70°.

[0036] A drill bit with 2 to 6 spiral drill chip flutes can improve drilling efficiency, reduce surgical time and damage to surrounding tissues, and ensure stability and accuracy during surgery. A spiral rise angle of 60° to 80° can facilitate chip removal, prevent bone chip accumulation, and reduce the probability of surgical infection.

[0037] Furthermore, the diameter of the positioning portion is 3 mm to 6 mm, and the length of the positioning portion is 5 mm to 10 mm. Preferably, the diameter of the positioning portion is 5 mm, and the length of the positioning portion is 8 mm.

[0038] This design is smaller in size, allowing for accurate positioning and more flexible operation during surgery. The strength of the drill bit is not affected, which improves surgical efficiency, prevents excessive bone chips, and reduces surgical infection.

[0039] The total length of the first cutting sub-portion, the second cutting sub-portion and the positioning portion is 80 mm to 120 mm. The length of the first cutting sub-portion is smaller than that of the second cutting sub-portion. Preferably, the total length is 100 mm.

[0040] The total length of the first cutting sub-section, the second cutting sub-section and the positioning section is 80 mm to 120 mm, which is convenient for operation, can meet the needs of orthopedic surgery, ensure surgical safety, and improve surgical efficiency.

[0041] The number of cutting edges of the positioning blade is 2 to 4. Preferably, the number of cutting edges of the positioning blade is 4, which can improve the positioning accuracy, prevent the drill bit from slipping during drilling, and reduce bone chips.

[0042] Embodiment 1:

[0043] like Figure 1 As shown, the utility model provides an orthopedic medullary drill, wherein the diameter of the second cutting sub-portion 3 and the positioning portion 4 gradually decreases along the feeding direction of the drill body 1, and the first spiral chip groove, the second spiral chip groove and the third spiral chip groove form a connected spiral chip groove.

[0044] Preferably, the positioning portion 4, the first cutting sub-portion 2, and the second cutting sub-portion 3 each have two spiral chip grooves, and the helix angle is 60°.

[0045] Furthermore, the diameter of the positioning portion 4 is 3 mm, the length is 5 mm, the total length of the first cutting sub-portion 2 and the second cutting sub-portion 3 is 80 mm, and the length of the first cutting sub-portion 2 is greater than the length of the second cutting sub-portion 3 .

[0046] Furthermore, the first cutting sub-portion 2 and the second cutting sub-portion 3 have two cutting edges, and the positioning portion 4 has two cutting edges.

[0047] During knee replacement, when the femoral medullary opening is performed, the positioning portion 4 can easily pierce the cortex of the intercondylar fossa of the femur, thereby guiding the drill body 1 to drill along the anatomical axis of the femur. When the femur is screwed in, the intercondylar fossa drill hole can be enlarged to facilitate the subsequent smooth insertion of the intramedullary rod into the medullary cavity.

[0048] Embodiment 2:

[0049] like Figure 2 As shown, the utility model provides an orthopedic medullary drill in which the diameter of the positioning portion 4 is smaller than the diameter of the second cutting sub-portion 3 .

[0050] Preferably, the positioning portion 4, the first cutting sub-portion 2, and the second cutting sub-portion 3 each have two spiral chip grooves, and the helix angle is 80°.

[0051] Furthermore, the diameter of the positioning portion 4 is 6 mm and the length is 10 mm, and the length of the first cutting sub-portion 2 is greater than the height of the second cutting sub-portion 3 .

[0052] Furthermore, the total length of the first cutting sub-portion 2, the second cutting sub-portion 3 and the positioning portion 4 is 120 mm.

[0053] Furthermore, the first cutting sub-portion 2 and the second cutting sub-portion 3 both have 6 cutting edges, and the positioning portion 4 has 4 cutting edges.

[0054] During knee replacement, when the femoral medullary opening is performed, the positioning portion 4 can easily pierce the cortex of the intercondylar fossa of the femur, thereby guiding the drill body 1 to drill along the anatomical axis of the femur. When the femur is screwed in, the intercondylar fossa drill hole can be enlarged to facilitate the subsequent smooth insertion of the intramedullary rod into the medullary cavity.

[0055] The beneficial effects of the utility model are as follows: the utility model is provided with a positioning blade on the positioning part, and the diameter of the positioning blade is designed to be smaller than the diameter of the positioning part, thereby improving the positioning accuracy and preventing the drill bit from slipping during drilling. The drill bit with a thinner diameter in front is convenient for positioning during drilling. The design of the cutting part gradually reducing its diameter along the feed direction of the drill body reduces the resistance during drilling, thereby achieving the purpose of rapid drilling.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An orthopedic medullary drill, characterized in that: It includes a drill body, a positioning part and a cutting part; A positioning blade is provided at one end of the positioning portion, and the other end of the positioning portion is connected to the cutting portion, and the diameter of the positioning blade is smaller than the diameter of the positioning portion; The cutting part includes a first cutting sub-part and a second cutting sub-part, the first cutting sub-part is connected to the drill body, the second cutting sub-part is connected to the positioning part, the first cutting sub-part is a cylindrical structure, and the diameter of the second cutting sub-part gradually decreases along the feed direction of the drill body.

2. The orthopedic medullary drill according to claim 1, characterized in that: A first spiral chip removal groove is provided on the outer peripheral side surface of the first cutting sub-portion along the feeding direction of the drill body, and the first spiral chip removal groove is used for guiding and removing chips during the feeding process of the drill body.

3. The orthopedic medullary drill according to claim 2, characterized in that: The outer peripheral side surface of the second cutting sub-part is provided with a second spiral chip groove and a first cutting edge along the feed direction of the drill body. The second spiral chip groove is adapted to the first cutting edge. The second spiral chip groove is used to discharge bone chips generated by the expansion of the first cutting edge during the feeding process of the drill body.

4. The orthopedic medullary drill according to claim 2, characterized in that: The outer peripheral side surface of the positioning portion is provided with a third spiral chip groove and a second cutting edge along the feed direction of the drill body. The third spiral chip groove is adapted to the second cutting edge. The third spiral chip groove is used to discharge bone chips generated by positioning the second cutting edge during the feed process of the drill body.

5. The orthopedic medullary drill according to claim 3, characterized in that: The chip removal input end of the first spiral chip groove is connected to the chip removal output end of the second spiral chip groove, the first spiral chip grooves are arranged at radial intervals of 2 to 6 along the first cutting sub-section, and the second spiral chip grooves are arranged at radial intervals of 2 to 6 along the second cutting sub-section, and the number of the first spiral chip grooves and the second spiral chip grooves are the same, and the helix angle of the first spiral chip groove and the second spiral chip groove is the same, which is 60° to 80°.

6. The orthopedic medullary drill according to claim 4, characterized in that: The third spiral chip removal grooves are arranged in a number of 2 to 6 at intervals along the radial direction of the positioning portion, and the helix angle of the third spiral chip removal grooves is 60° to 80°.

7. The orthopedic medullary drill according to claim 1, characterized in that: The diameter of the positioning portion is 3mm to 6mm, the length of the positioning portion is 5mm to 10mm, the total length of the first cutting sub-portion, the second cutting sub-portion and the positioning portion is 80mm to 120mm, and the length of the first cutting sub-portion is smaller than that of the second cutting sub-portion.

8. The orthopedic medullary drill according to claim 1, characterized in that: The number of cutting edges of the positioning blade is 2 to 4.

9. An orthopedic intramedullary drill according to any one of claims 1 to 8, characterized in that: The diameter of the positioning portion gradually decreases along the feeding direction of the drill body, and at the connection between the second cutting sub-portion and the positioning portion, the diameter of the positioning portion is the same as the diameter of the second cutting sub-portion.

10. The orthopedic medullary drill according to any one of claims 1 to 8, characterized in that: At the connection between the second cutting sub-portion and the positioning portion, the diameter of the positioning portion is smaller than the diameter of the second cutting sub-portion.

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