Medullary cavity reamer

Abstract

The utility model discloses a medullary cavity reamer which comprises a plurality of blades (1) which are integrally formed, the blades (1) are distributed in a petal shape, each blade (1) is formed by a vertical plane (2), a first inclined plane (3) and a second inclined plane (4), an acute angle is formed between the vertical plane (2) and the first inclined plane (3), and an obtuse angle is formed between the first inclined plane (3) and the second inclined plane (4). According to the utility model, an arc ligament surface is omitted, so that the sharpness of the blade point of the reamer is improved, the operation duration of a patient is shortened, and the operation time of a doctor is shortened.

Description

Technical Field

[0001] The utility model relates to the field of reamer, in particular to a medullary cavity reamer. Background Art

[0002] Hip joint reamer is used for medical treatment. When used, the reamer is inserted into the medullary cavity of the human thigh, and the medullary cavity is enlarged by rotation, and then the implant is implanted into the enlarged medullary cavity. Figure 1-Figure 5 As shown, there are multiple blades 1', and the multiple blades 1' are distributed in a petal shape. Each blade 1' is composed of a vertical surface 2', an arc ligament surface 3', a first inclined surface 4', and a second inclined surface 5'. The angle formed by the vertical surface 2' and the arc ligament surface 3' is 90° or close to 90°. The ligament surface and the first inclined surface 4' form a blade to expand the medullary cavity. The angle formed between the arc ligament surface 3' and the first inclined surface 4' is an obtuse angle, and the angle formed between the first inclined surface 4' and the second inclined surface 5' is an obtuse angle. The setting of the arc ligament surface 3' can improve the wear resistance of the reamer, but it will cause the blade of the reamer to be blunt, resulting in the doctor's operation time being too long, and the medullary cavity cannot be effectively expanded, which increases the patient's operation time. Utility Model Content

[0003] In order to overcome the above shortcomings, the purpose of the utility model is to provide a medullary cavity reamer which reduces the operation time of patients, shortens the operation time of doctors and has a sharp reamer blade.

[0004] In order to achieve the above purpose, one of the technical solutions adopted by the utility model is: a medullary cavity reamer, including multiple integrally formed blades, the multiple blades are distributed in a petal shape, each of the blades is formed by a vertical surface, a first inclined surface, and a second inclined surface, an acute angle is formed between the vertical surface and the first inclined surface, and the first inclined surface and the second inclined surface are at an obtuse angle.

[0005] The beneficial effect of the intramedullary reamer of the utility model is that each blade eliminates the existing arc ligament surface, and each blade is formed by a vertical surface, a first inclined surface, and a second inclined surface. The acute angle formed directly between the vertical surface and the first inclined surface forms a sharp blade. Compared with the existing angle of 90° or close to 90° formed by the vertical surface and the arc ligament surface, it is sharper, shortens the doctor's operation time, and reduces the patient's operation time.

[0006] Preferably, the maximum outer diameter of the cross section of each blade gradually decreases from top to bottom.

[0007] Preferably, a plurality of blades are integrally formed on the circumference of the column, and the lower end of the column is a positioning column, which is used to be positioned in the patient's body to prevent it from deviating.

[0008] Preferably, the bottom of the positioning column is hemispherical, so that it can be better positioned in the patient's body.

[0009] Preferably, the vertical surface starts from the cylinder, and the second inclined surface ends at the cylinder. The vertical surface of each two adjacent blades, the cylinder surface, and the second inclined surface form a chip storage groove for storing bone chips scraped off by the reamer.

[0010] Preferably, a plurality of grooves are sunken in the surface of the column between each two adjacent blades, the length direction of the grooves is arranged along the length direction of the column, the number of the grooves matches the number of blades, the grooves are located between each two adjacent blades, the vertical surface of one of the blades starts at the bottom of the groove, and the second inclined surface of the blade adjacent to it ends at the bottom of the groove. The surface of the column is sunken with a plurality of grooves, which expands the storage space of the chip storage tank, increases the time duration of each use of the reamer, and further shortens the operation time of the patient and the doctor.

[0011] Preferably, a plurality of the blades are formed at the lower end of the column, and the upper end of the column has a first clamping position and a second clamping position, and the first clamping position and the second clamping position are used to connect to an electric tool.

[0012] Preferably, the blade tips of the plurality of blades are provided with spirally ascending air relief grooves. Once the chip storage grooves are full of bone chips, the generated air pressure is discharged from the air relief grooves. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A bottom view of an existing bone marrow reamer;

[0014] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0015] Figure 3 It is a front view of an existing bone marrow reamer;

[0016] Figure 4 for Figure 3 A partial enlarged view of the middle BB;

[0017] Figure 5 for Figure 4 A partial enlarged view of point C in the middle;

[0018] Figure 6 It is a bottom view of this embodiment;

[0019] Figure 7 for Figure 6 A partial enlarged view of point D in the middle;

[0020] Figure 8 It is the front view of this embodiment;

[0021] Fig. 9 for Figure 8Sectional view at EE;

[0022] Fig.10 is a three-dimensional diagram of this embodiment;

[0023] Fig.11 for Fig.10 A partial enlarged view of F in the middle.

[0024] In the figure:

[0025] 1', blade; 2', vertical surface; 3', arc ligament surface; 4', first inclined surface; 5', second inclined surface;

[0026] 1. Blade; 2. Vertical surface; 3. First inclined surface; 4. Second inclined surface; 5. Column; 6. Positioning column; 7. Groove; 8. First clamping position; 9. Second clamping position. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0028] See also Figure 6-Figure 11 As shown, this embodiment discloses a medullary cavity reamer, including a plurality of integrally formed blades 1, wherein the maximum outer diameter of the cross section of each blade 1 gradually decreases from top to bottom, and the plurality of blades 1 are distributed in a petal shape, and each blade 1 is formed by a vertical surface 2, a first inclined surface 3, and a second inclined surface 4, wherein an acute angle is formed between the vertical surface 2 and the first inclined surface 3 to form a blade, and the first inclined surface 3 and the second inclined surface 4 are at an obtuse angle.

[0029] A plurality of blades 1 are integrally formed on the circumference of the column 5 . The lower end of the column 5 is a positioning column 6 , and the bottom of the positioning column 6 is hemispherical.

[0030] In some embodiments, the vertical surface 2 starts from the outer surface of the cylinder 5, and the second inclined surface 4 ends at the outer surface of the cylinder 5. The vertical surfaces 2 of two adjacent blades 1, the adjacent second inclined surfaces 4, and the outer surface of the cylinder 5 form a chip storage groove, and the scraped bone chips are stored in the chip storage groove along the second inclined surface 4.

[0031] In order to expand the storage space of the chip storage groove as much as possible, in other embodiments, Fig.11As shown, a plurality of grooves 7 are sunken in the surface of the column 5 between each two adjacent blades 1, and the length direction of the grooves 7 is arranged along the length direction of the column 5. The number of the grooves 7 matches the number of the blades 1. The grooves 7 are located between each two adjacent blades 1, and the vertical surface 2 of one blade 1 starts at the bottom of the groove 7, and the second inclined surface 4 of the adjacent blade 1 ends at the bottom of the groove 7. The arrangement of the grooves 7 increases the storage space, reduces the number of times the reamer removes chips, and shortens the operation time.

[0032] A plurality of blades 1 are formed at the lower end of the column 5, and the upper end of the column 5 has a first clamping position 8 and a second clamping position 9, and the first clamping position 8 and the second clamping position 9 are used to connect an electric tool. The electric tool is a prior art, which is used to drive the column 5 to rotate, and then drive the plurality of blades 1 to rotate in the vertical direction to expand the medullary cavity.

[0033] In other embodiments, since the scraped bone chips are stored in the chip storage groove, once the chip storage groove is filled, if the reamer continues to work, the generated air pressure cannot be discharged, and the cutting edges of the multiple blades 1 are provided with spirally ascending air relief grooves (not shown in the accompanying drawings) to ensure the normal operation of the reamer.

[0034] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A medullary cavity reamer, comprising a plurality of integrally formed blades (1), wherein the plurality of blades (1) are distributed in a petal shape, and characterized in that: Each blade (1) is formed by a vertical surface (2), a first inclined surface (3), and a second inclined surface (4); an acute angle is formed between the vertical surface (2) and the first inclined surface (3); and an obtuse angle is formed between the first inclined surface (3) and the second inclined surface (4).

2. The intramedullary reamer according to claim 1, characterized in that: The maximum outer diameter of the cross section of each blade (1) gradually decreases from top to bottom.

3. The intramedullary reamer according to claim 1, characterized in that: The plurality of blades (1) are integrally formed on the circumference of a column (5), and the lower end of the column (5) is a positioning column (6).

4. The intramedullary reamer according to claim 3, characterized in that: The bottom of the positioning column (6) is hemispherical.

5. The intramedullary reamer according to claim 3, characterized in that: The vertical surface (2) starts from the column (5), and the second inclined surface (4) ends at the column (5).

6. The intramedullary reamer according to claim 5, characterized in that: A plurality of grooves (7) are provided inwardly on the surface of the column (5) between each two adjacent blades (1), wherein the length direction of the grooves (7) is arranged along the length direction of the column (5), the number of the grooves (7) matches the number of the blades (1), and the grooves (7) are located between each two adjacent blades (1), wherein the vertical surface (2) of one of the blades (1) starts at the bottom of the groove (7), and the second inclined surface (4) of the adjacent blade (1) terminates at the bottom of the groove (7).

7. The intramedullary reamer according to claim 3, characterized in that: A plurality of blades (1) are formed at the lower end of a column (5); the upper end of the column (5) has a first clamping position (8) and a second clamping position (9); the first clamping position (8) and the second clamping position (9) are used to connect an electric tool.

8. The intramedullary reamer according to claim 1, characterized in that: The blade tips of the plurality of blades (1) are provided with spirally ascending air release grooves.

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