Intramedullary nail reaming head capable of being quickly replaced and connected

Abstract

The utility model discloses an intramedullary nail reaming head capable of being quickly replaced and connected, and belongs to the technical field of medical instruments. The defects that in the prior art, a traditional reaming head and a connecting rod are connected in a single mode, and different types of reaming heads cannot be rapidly matched and replaced are overcome. A main body structure of the bone marrow expanding head comprises a bone marrow expanding head body, a tough opening used for removing bone mass is formed in the end of the bone marrow expanding head body, a spiral chip groove is formed in the tough opening, a first guide needle penetrating hole, an inwards-concave clamping groove and a connecting rod mounting hole which are communicated with one another are formed in the bone marrow expanding head body, and the end of a connecting rod is inserted into the inwards-concave clamping groove. The outer side wall of the connecting rod is attached to the inner wall of the connecting rod mounting hole. The device is mainly used for removing sclerotin in a medullary cavity during marrow expansion.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical instruments, and concretely relates to a intramedullary nail reaming head capable of quick replacement connection. BACKGROUND

[0002] The purpose of reaming is to enlarge the diameter of the medullary cavity before inserting the intramedullary nail, so that the intramedullary nail can be smoothly inserted. The design of the intramedullary nail reaming head needs to consider various factors to ensure that the reaming operation can be safely and effectively performed during surgery, the bone in the medullary cavity can be smoothly removed during the reaming process, the reaming head cannot be easily deformed or damaged, and the friction and damage to the surrounding tissues are reduced.

[0003] The connection between the existing reaming head and the connecting rod is relatively simple, and most of them are connected by threads or other forms of fixed connection, which is inconvenient in actual operation and is prone to loosening and deformation. For example, when replacing reaming heads of different specifications, a long time is needed to complete the disassembly and reinstallation process, increasing the operation time and complexity. In addition, if the bone chips generated during the reaming process cannot be effectively removed in time, unnecessary pressure may be exerted on the surrounding tissues, affecting the continuity and efficiency of the reaming.

[0004] A multi-angle rib fracture end reamer for use under thoracoscopy is disclosed in Chinese Utility Model Patent No. CN 202173459U, which is composed of a handle, a connecting rod and a lance-shaped reaming head. The handle is tapered to the connecting rod, and the connecting rod is tapered to the lance-shaped reaming head. The lance-shaped reaming head gradually transitions into a needle shape, making it easy to penetrate into the fracture end bone marrow cavity. The multi-angle rib fracture end reamer for use under thoracoscopy is suitable for different angles and curvatures of the rib under the endoscope, facilitating the reaming of the fracture end and the protection of the intercostal blood vessels and nerves. However, it has the following disadvantages: the connection method is single, different types of reaming heads cannot be quickly replaced, and bone chips cannot be effectively removed in time. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problems of the prior art and provides an intramedullary nail reaming head capable of quick replacement connection.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] An intramedullary nail reaming head capable of quick replacement connection comprises a reaming head main body, a tough mouth for removing bone mass is arranged at the end of the reaming head main body, a spiral chip removal groove is arranged on the tough mouth, a guide needle through hole one, an inner recess type clamping groove and a connecting rod mounting hole are arranged in the reaming head main body and are in communication with each other, the end of the connecting rod is inserted into the inner recess type clamping groove, and the outer side wall of the connecting rod is attached to the inner wall of the connecting rod mounting hole.

[0008] Preferably, a connecting rod rotation-stopping surface is arranged between the inner recessed clamping groove and the connecting rod mounting hole.

[0009] Preferably, the connecting rod is internally provided with a guide pin through hole two in communication with the guide pin through hole one, and a guide pin is mounted through the guide pin through hole one and the guide pin through hole two.

[0010] Preferably, four tough mouths are arranged, and the four tough mouths are arranged in a distributed manner at the end of the reaming head main body.

[0011] Preferably, a chip removal groove is arranged between the two adjacent tough mouths.

[0012] Preferably, the inner recessed clamping groove is a round hole structure.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1. By arranging the guide pin through hole one, the inner recessed clamping groove and the connecting rod mounting hole in the reaming head main body in communication, and arranging the connecting rod rotation-stopping surface between the inner recessed clamping groove and the connecting rod mounting hole, the quick and stable connection between the connecting rod and the reaming head main body is realized, the operation steps of replacing different specifications of reaming heads in the operation process are greatly simplified, the operation time is effectively shortened, and the operation efficiency is improved.

[0015] 2. The tough mouth for removing bone mass is arranged at the end of the reaming head main body, and the spiral chip removal groove is arranged on the tough mouth, and the chip removal groove is further arranged between the two adjacent tough mouths, which not only increases the number of bone chip removal channels, but also can more effectively remove the bone chips from the operation area through the spiral chip removal groove, reduces the influence of the bone chips on the surrounding tissues, and improves the safety and effect of the operation.

[0016] 3. The connecting rod is internally provided with the guide pin through hole two in communication with the guide pin through hole one, so that the guide pin can smoothly penetrate the whole system, the cooperation between the reaming head and the guide pin is enhanced, and the stability and accuracy in the operation process are further improved.

[0017] 4. The inner recessed clamping groove adopts the round hole structure design, so that the insertion of the connecting rod is smoother and the positioning is more accurate, the damage risk caused by improper operation is reduced, and the design is beneficial to maintaining the close cooperation between the connecting rod and the reaming head main body, and ensuring the reliability in the operation process.

[0018] In summary, the utility model can not only realize the quick disassembly of the reaming head, but also has close and firm interface cooperation, high assembly precision, and better improvement and promotion in the aspects of smoothly removing the bone mass in the medullary cavity, reducing the friction and damage to the surrounding tissues during the reaming process, and the like, compared with similar products. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is one of the structural schematic views of the utility model;

[0020] Figure 2 It is the second structural schematic view of the utility model;

[0021] Figure 3 It is the internal structure schematic view of the utility model;

[0022] Figure 4 It is the internal structure schematic view of the utility model when the reaming head main body and connecting rod are installed;

[0023] Figure 5 It is the structural schematic view when the utility model is installed and used;

[0024] Figure 6 It is Figure 5 the internal structure schematic view.

[0025] In the figure: 1, reaming head main body; 2, guide needle; 3, connecting rod; 11, concave clamping groove; 12, guide needle through hole one; 13, connecting rod mounting hole; 14, connecting rod rotation stop surface; 15, chip removal groove; 16, tough mouth; 17, spiral chip removal groove; 31, guide needle through hole two. DETAILED DESCRIPTION

[0026] The utility model will be further described below through specific embodiments and in conjunction with the drawings.

[0027] Embodiment 1:

[0028] As shown in Figure 1-4 , a reaming head of intramedullary nail can be quickly connected, which comprises a reaming head main body 1, the reaming head main body 1 is provided with a tough mouth 16 for removing bone mass at the end, the tough mouth 16 is provided with a spiral chip removal groove 17, the reaming head main body 1 is internally provided with a guide needle through hole one 12, a concave clamping groove 11 and a connecting rod mounting hole 13 which are communicated with each other, the end of the connecting rod 3 is inserted into the concave clamping groove 11, and the outer wall of the connecting rod 3 is attached to the inner wall of the connecting rod mounting hole 13.

[0029] By setting the hollow concave clamping groove 11 at the rear end of the reaming head main body 1, the connecting rod 3 can be quickly replaced with different specifications of reaming heads, the concave design in the concave clamping groove 11 can realize firm connection of the reaming head and the connecting rod 3, the circular hole design at the end can realize concentric rotation of the reaming head and the connecting rod 3, and the stability is higher than that of similar products. Through the embodiment, the replacement during the operation process is more convenient, and the utility model has the advantages of simple mechanism, convenient use, reasonable design, simple assembly, convenient structure and reliability, and can ensure quick disassembly and assembly of the reaming head during the reaming process.

[0030] Embodiment 2:

[0031] As Figure 5-6 As shown, the quick-changeable intramedullary nail reaming head differs from the embodiment 1 in that a connecting rod rotation-stopping surface 14 is arranged between the inner recessed clamping groove 11 and the connecting rod mounting hole 13. The rotation of the connecting rod 3 can be effectively transmitted to the reaming head through the connecting rod rotation-stopping surface 14.

[0032] Further, the connecting rod 3 is internally provided with a guide pin through hole two 31 communicating with the guide pin through hole one 12, and the guide pin 2 is mounted through the guide pin through hole one 12 and the guide pin through hole two 31. This design enables the reaming head to be accurately positioned and operated along the guide pin 2, reducing the risk of deviation during surgery and improving the accuracy and success rate of surgery.

[0033] Further, four resilient ports 16 are arranged at the end of the reaming head main body 1, and a chip removal groove 15 is arranged between adjacent two resilient ports 16. The design of the four uniformly arranged resilient ports 16 and the chip removal groove 15 further simplifies the manufacturing process while ensuring functionality, which is suitable for mass production. At the same time, the resilient ports 16 and the spiral chip removal groove 17 arranged at the end of the reaming head main body 1 can effectively remove bone mass and quickly remove bone chips, avoiding the interference of bone chip accumulation on the reaming process. The chip removal groove 15 arranged between adjacent resilient ports 16 further enhances the chip removal effect, ensuring the continuity and efficiency of the reaming process.

[0034] Further, the inner recessed clamping groove 11 is a round hole structure, which is simple to process and has low cost.

[0035] The working principle of the utility model is:

[0036] 1. Quick replacement mechanism:

[0037] During the preparation stage of the operation or when the specification of the reaming head needs to be adjusted, the operator can complete the assembly and disassembly between the connecting rod 3 and the reaming head main body 1 through simple insertion and pulling out actions. This is because the reaming head main body 1 is internally provided with the guide pin through hole one 12, the inner recessed clamping groove 11 and the connecting rod mounting hole 13 which are in communication with each other. The end of the connecting rod 3 can be easily inserted into the inner recessed clamping groove 11, and because the outer side wall of the connecting rod 3 is in close contact with the inner wall of the connecting rod mounting hole 13, the tight connection between the two is ensured.

[0038] In order to prevent the connecting rod 3 from rotating during use and thereby affecting the stability of the operation, a connecting rod rotation-stopping surface 14 is designed between the inner recessed clamping groove 11 and the connecting rod mounting hole 13, which ensures the stable connection between the connecting rod 3 and the reaming head main body 1. The rotation of the connecting rod 3 can be effectively transmitted to the reaming head through the connecting rod rotation-stopping surface 14, making the entire device more stable and reliable during operation.

[0039] 2. Efficient chip removal function:

[0040] When the reaming operation is carried out, the tough mouth 16 at the end of the reamer head main body 1 is responsible for removing the bone mass, and four evenly arranged tough mouths 16 are arranged, which not only increases the cutting area and improves the work efficiency, but also the chip removal groove 15 arranged between the adjacent two tough mouths 16 further enhances the ability of bone chip removal;

[0041] In addition, the tough mouth 16 is also provided with a spiral chip removal groove 17, which can effectively remove the bone chips generated in the cutting process along the spiral path from the surgical area, avoid the unnecessary pressure on the surrounding tissue caused by the accumulation of bone chips, and ensure the safety and smoothness of the operation process.

[0042] 3, the guide needle guide system:

[0043] By providing the guide needle through hole two 31 in the connecting rod 3 which is communicated with the guide needle through hole one 12, the guide needle 2 can pass through the guide needle through hole two 31 in the connecting rod 3 from the guide needle through hole one 12 in the whole reamer head system, which ensures the accurate guiding effect of the guide needle 2 in the whole operation process, improves the accuracy of the operation, and also maintains the stability and consistency of the whole system.

[0044] In summary, the connecting rod 3 can be easily inserted and pulled out in use, and in the actual work process, it can realize precise and close cooperation with other instruments, so as to stably and reliably achieve the effect of firm locking, and ensure that the whole connecting system maintains high stability in the running process.

Claims

1. A quick-connect intramedullary nail reamer head, comprising a reamer head body (1), characterized in that: The end of the reamer head body (1) is provided with a ligament (16) for removing bone. The ligament (16) is provided with a spiral chip removal groove (17). The inside of the reamer head body (1) is provided with a guide needle through hole (12), a concave groove (11) and a connecting rod mounting hole (13) that are interconnected. The end of the connecting rod (3) is inserted into the concave groove (11), and the outer wall of the connecting rod (3) is in contact with the inner wall of the connecting rod mounting hole (13).

2. The quick-connectable intramedullary nail reamer head according to claim 1, characterized in that: A connecting rod anti-rotation surface (14) is provided between the concave groove (11) and the connecting rod mounting hole (13).

3. The quick-connectable intramedullary nail reamer head according to claim 2, characterized in that: The connecting rod (3) is provided with a guide needle through hole two (31) that communicates with the guide needle through hole one (12), and a guide needle (2) is installed through the guide needle through hole one (12) and the guide needle through hole two (31).

4. The quick-connectable intramedullary nail reamer head according to any one of claims 1-3, characterized in that: The ligament (16) is provided in four parts, and the four ligaments (16) are evenly distributed at the end of the main body (1) of the reamer.

5. The quick-connectable intramedullary nail reamer head according to claim 4, characterized in that: A chip removal groove (15) is provided between two adjacent joints (16).

6. The quick-connectable intramedullary nail reamer head according to any one of claims 1-3, characterized in that: The recessed slot (11) has a circular hole structure.

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