Marrow expanding soft drill

Abstract

The utility model relates to the technical field of medical instruments, and particularly discloses a reaming soft drill which comprises a connecting rod, a drill bit and a locking sleeve. The drill bit is provided with a positioning shaft, a limiting groove is formed in the positioning shaft, a limiting table matched with the limiting groove is arranged at the end of the connecting rod, and the limiting table is inserted into the limiting groove in a pluggable mode. An internal thread is formed on the inner wall of the locking sleeve, the diameter of the connecting rod is the same as that of the positioning shaft, and external threads matched with the internal thread are arranged on the peripheral surfaces of the connecting rod and the positioning shaft; when the locking sleeve is screwed, the locking sleeve can move to the connecting position of the connecting rod and the positioning shaft so as to keep the position of the drill bit relative to the connecting rod. Therefore, the problems of unstable connection and unstable use in the use process of the reaming soft drill in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a soft drill for expanding medullary tissue and a working method of a hip joint exoskeleton rehabilitation robot. Background Art

[0002] Intramedullary nail surgery often uses a soft drill for medullary expansion. The soft drill includes a connecting rod and a drill bit that is clamped to the end of the connecting rod. Since the drill bit and the connecting rod are connected only by the vertical protrusion and the blocking groove, there is no constraint in the horizontal direction. When performing intramedullary nail surgery to expand the medullary, it is necessary to alternate between a hollow electric drill and a solid electric drill. When using a solid electric drill, since the electric drill cannot be guided by a ball-head guide pin, the drill bit and the connecting rod are connected only by the blocking groove and the protrusion, and there is no constraint in the horizontal direction. There is a risk that the drill bit will fall into the medullary cavity. Once it falls into the medullary cavity, it can only be removed surgically, which increases the risk of surgery and endangers the life and health of the patient. When using a hollow electric drill, although there is a ball-head guide pin to guide the drill bit, so that the drill bit is constrained in the horizontal direction and will not fall, the drill bit is still active, and there are errors when expanding the medullary cavity, which affects the surgical effect. In addition, many hospitals do not purchase hollow electric drills for surgery.

[0003] In view of the problems of unstable connection and unstable use of the medullary expansion soft drill during use, a more reasonable technical solution needs to be proposed to solve the current technical problems. Utility Model Content

[0004] The utility model aims to provide a soft drill for expanding the medullary, so as to solve the problems of unstable connection and unstable use of the soft drill for expanding the medullary in the prior art during use.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a soft drill for expanding medullary tissue, comprising a connecting rod, a drill bit and a locking sleeve; the drill bit has a positioning shaft, a limiting groove is formed in the positioning shaft, and a limiting platform adapted to the limiting groove is provided at the end of the connecting rod, and the limiting platform can be plugged into the limiting groove in a removable manner;

[0006] The inner wall of the locking sleeve is formed with an internal thread, the connecting rod and the positioning shaft have the same diameter, and the outer circumferential surfaces of both are provided with external threads matching the internal thread; when the locking sleeve is screwed, the locking sleeve can move to the connection between the connecting rod and the positioning shaft to maintain the position of the drill bit relative to the connecting rod.

[0007] In a possible design, tough grooves are formed on the outer circumference of the connecting rod to make the connecting rod tough.

[0008] In a possible design, the tough grooves are arranged in a circumferential direction, and the tough grooves extend at uniform intervals along the axial direction of the connecting rod.

[0009] In a possible design, the tough groove is inclined relative to the axis of the connecting rod, and the inclination angle α is 10° to 30°.

[0010] In a possible design, the toughened groove has an extended groove deviating from its contour line.

[0011] In a possible design, a stop shaft is connected to the end of the connecting rod, and the diameter of the stop shaft is larger than that of the connecting rod.

[0012] In a possible design, the connecting rod and the stop shaft are integrally formed.

[0013] In a possible design, a plurality of inclined blades are formed on the drill bit, the gaps between adjacent blades form chip grooves, and each blade is provided with a blocking groove arranged along the circumferential direction of the drill bit.

[0014] In a possible design, the groove walls of the chip removal groove and the blocking groove are both formed as arc surfaces.

[0015] In a possible design, a friction portion for increasing friction force is formed on the outer circumference of the locking sleeve.

[0016] In a possible design, the friction portion is formed into a grid-like pattern.

[0017] Through the above technical solution, when the soft medullary drill is not in working state, the locking sleeve can slide freely on the connecting rod and there is a threaded limiting structure at the bottom, so it will not fall off. When the soft medullary drill is in working state, the locking sleeve is screwed onto the external thread at the connection between the drill bit and the connecting rod. At this time, the connection state of the soft medullary drill is as shown in the attached figure. At this time, the drill bit and the connecting rod can be stably connected. Whether using a hollow electric drill or a solid electric drill, the drill bit will not fall off and can be equipped and used. The stable connection greatly reduces the error.

[0018] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0020] Figure 1 is a schematic structural diagram of a medullary expansion soft drill in one embodiment, wherein the medullary expansion soft drill is in a non-working state;

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure of part A in the middle;

[0022] Figure 3 It is a schematic structural diagram of a medullary expansion soft drill in one embodiment, wherein the medullary expansion soft drill is in a working state.

[0023] Description of Reference Numerals

[0024] 1-connecting rod, 11-limiting platform, 2-drill bit, 21-blade, 22-chip groove, 23-blocking groove, 3-locking sleeve, 31-friction part, 4-positioning shaft, 41-limiting groove, 51-tough groove, 52-extension groove, 6-stop shaft. DETAILED DESCRIPTION

[0025] The specific implementation of the present utility model is described in detail below with reference to the accompanying drawings.

[0026] According to a specific embodiment of the utility model, a soft drill for medullary expansion is provided. Figures 1 to 3 One specific embodiment is shown.

[0027] See also Figures 1 to 3 As shown, the medullary expansion soft drill includes a connecting rod 1, a drill bit 2 and a locking sleeve 3; the drill bit 2 has a positioning shaft 4, a limiting groove 41 is formed in the positioning shaft 4, and a limiting platform 11 is provided at the end of the connecting rod 1 to match the limiting groove 41, and the limiting platform 11 can be removably inserted into the limiting groove 41; an internal thread is formed on the inner wall of the locking sleeve 3, the connecting rod 1 and the positioning shaft 4 have the same diameter, and the outer circumferential surfaces of both are provided with external threads matching the internal threads; when the locking sleeve 3 is twisted, the locking sleeve 3 can move to the connection between the connecting rod 1 and the positioning shaft 4 to maintain the position of the drill bit 2 relative to the connecting rod 1.

[0028] With the above technical solution, when the soft medullary reaming drill is not in working state, the locking sleeve 3 can slide freely on the connecting rod 1 and there is a threaded limiting structure at the bottom, so it will not fall off. When the soft medullary reaming drill is in working state, the locking sleeve 3 is screwed onto the external thread at the connection between the drill bit 2 and the connecting rod 1. At this time, the connection state of the soft medullary reaming drill is as follows: Figure 3 As shown, at this time, the drill bit 2 and the connecting rod 1 can be stably connected. Whether a hollow electric drill or a solid electric drill is used, the drill bit 2 will not fall off, and both can be equipped and used. The stable connection greatly reduces the error.

[0029] In an embodiment provided in the present disclosure, tough grooves 51 are formed on the outer periphery of the connecting rod 1 to make the connecting rod 1 tough, so that the connecting rod 1 can bend and deform to adapt to the curved structure of the medullary cavity, so that the drill bit 2 can be extended into the medullary cavity as a whole.

[0030] Specifically, the tough grooves 51 are arranged in the circumferential direction, and the tough grooves 51 extend at uniform intervals along the axial direction of the connecting rod 1. In this way, the deformation amplitude of the connecting rod 1 can be increased, thereby improving the adaptability to the medullary cavity.

[0031] Furthermore, the toughness groove 51 is inclined relative to the axis of the connecting rod 1, and the inclination angle α is 10° to 30°. This arrangement allows the connecting rod 1 to have good rigidity while being uniformly deformed. In this way, it can ensure effective power transmission and better adapt to different bending structures of the medullary cavity.

[0032] In the present disclosure, the inclination angle α of the tough groove 51 is 15°. In other embodiments, the inclination angle α of the tough groove 51 can also be set to 10°, 20°, 25°, or 30°. In this regard, those skilled in the art can make a comprehensive reference setting based on the specifications of the connecting rod 1 and the groove depth and groove width of the tough groove 51.

[0033] In an embodiment provided by the present disclosure, the toughness groove 51 has an extension groove 52 deviating from its contour line, and such a configuration can make the connecting rod 1 have better anti-twist performance. As a result, the connecting rod 1 has better toughness and rigidity, can effectively transmit power while better adapting to the curved structure of the medullary cavity, thereby ensuring the use effect.

[0034] In the present disclosure, a stop shaft 6 is connected to the end of the connecting rod 1, and the diameter of the stop shaft 6 is larger than the connecting rod 1, which can not only play a certain limiting role on the locking sleeve 3, but also ensure the stable transmission of power in this section.

[0035] In order to ensure the connection strength, the connecting rod 1 and the stop shaft 6 are integrally formed, which is not only convenient for manufacturing, but also can ensure the reliability of the connection relationship between the connections, and is also beneficial to the transmission of power. It is convenient for use during surgery, making the connection between the drill bit 2 and the connecting rod 1 more stable, reducing surgical risks and reducing medullary expansion errors.

[0036] In an exemplary embodiment provided by the present disclosure, a plurality of inclined blades 21 are formed on the drill bit 2, the gaps between adjacent blades 21 form chip grooves 22, and each blade 21 is provided with a blocking groove 23 arranged along the circumferential direction of the drill bit 2. This is beneficial to help the drill bit 2 expand the medullary cavity and reduce surgical risks.

[0037] In a preferred embodiment, the groove walls of the chip removal groove 22 and the blocking groove 23 are both formed as arc surfaces, which can prevent the accumulation of debris and is beneficial to the removal of debris and subsequent cleaning and maintenance.

[0038] For ease of operation, a friction portion 31 for increasing friction is formed on the outer periphery of the locking sleeve 3, so that the friction between the locking sleeve 3 and the hand can be increased, thereby facilitating medical personnel to adjust the position of the locking sleeve 3, so as to quickly and effectively adjust the locking sleeve 3 to the target position, thereby meeting different needs.

[0039] In the present disclosure, the friction portion 31 is formed into a grid-like pattern, which can effectively improve the hand feel during operation and thereby adjust the locking sleeve 3 to a target position.

[0040] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

Claims

1. A soft drill for expanding medullary tissue, characterized in that: The invention comprises a connecting rod (1), a drill bit (2) and a locking sleeve (3); the drill bit (2) has a positioning shaft (4), a limiting groove (41) is formed in the positioning shaft (4), and a limiting platform (11) matching the limiting groove (41) is provided at the end of the connecting rod (1), and the limiting platform (11) can be plugged into the limiting groove (41) in a removable manner; The inner wall of the locking sleeve (3) is formed with an internal thread, the connecting rod (1) and the positioning shaft (4) have the same diameter, and the outer circumferences of both are provided with external threads matching the internal threads; when the locking sleeve (3) is screwed, the locking sleeve (3) can move to the connection between the connecting rod (1) and the positioning shaft (4) to maintain the position of the drill bit (2) relative to the connecting rod (1).

2. The soft drill for medullary expansion according to claim 1, characterized in that: A tough groove (51) is formed on the outer periphery of the connecting rod (1) so as to make the connecting rod (1) tough.

3. The soft drill for expanding medullary cavity according to claim 2, characterized in that: The tough grooves (51) are arranged in a circumferential direction, and the tough grooves (51) extend at even intervals along the axial direction of the connecting rod (1).

4. The soft drill for expanding medullary cavity according to claim 2, characterized in that: The tough groove (51) is arranged to be inclined relative to the axis of the connecting rod (1), and the inclination angle α is 10° to 30°.

5. The soft drill for expanding medullary cavity according to claim 2, characterized in that: The tough groove (51) has an extended groove (52) deviating from its contour line.

6. The soft drill for expanding the medullary cavity according to any one of claims 1 to 5, characterized in that: The end of the connecting rod (1) is connected to a stop shaft (6), and the diameter of the stop shaft (6) is larger than that of the connecting rod (1).

7. The soft drill for expanding medullary cavity according to claim 6, characterized in that: The connecting rod (1) and the stop shaft (6) are integrally formed.

8. The soft drill for expanding the medullary cavity according to any one of claims 1 to 5, characterized in that: The drill bit (2) is formed with a plurality of inclined blades (21), the gaps between adjacent blades (21) form chip removal grooves (22), and each blade (21) is provided with a blocking groove (23) arranged along the circumferential direction of the drill bit (2).

9. The soft drill for expanding medullary cavity according to claim 8, characterized in that: The groove walls of the chip removal groove (22) and the blocking groove (23) are both formed as arc surfaces.

10. The soft drill for expanding the medullary cavity according to any one of claims 1 to 5, characterized in that: The outer periphery of the locking sleeve (3) is formed with a friction portion (31) for increasing frictional force, and the friction portion (31) is formed into a grid-like pattern.

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