CN216495494U

CN216495494U - Medullary cavity enlarging drill

Info

Publication number: CN216495494U
Application number: CN202122838067.0U
Authority: CN
Inventors: 孙新旭; 钱超
Original assignee: Changzhou Jianli Bangde Medical Devices Co Ltd
Current assignee: Changzhou Jianli Bangde Medical Devices Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-05-13
Anticipated expiration: 2031-11-18

Abstract

The utility model relates to the technical field of medical instruments, in particular to a medullary cavity expanding drill which comprises a body, wherein the body comprises a drill handle, a connecting piece and a drill bit which are sequentially connected, the body is of a hollow structure, the drill handle is provided with internal threads, the drill handle provided with the internal threads is adopted, the tail end of a bone guide needle is provided with external threads matched with the internal threads of the drill handle, and bone fragments can be smoothly discharged by mutually matching the internal threads with the external threads and rotating the internal threads to apply pressure during the use process of the bone guide needle.

Description

Medullary cavity enlarging drill

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a medullary cavity expanding drill.

Background

The intramedullary nail is a device which is arranged in a medullary cavity and used for internally fixing a fracture part and is adopted recently. Because the inner part of the medullary cavity is not a regular tube with the same diameter, in order to ensure that the intramedullary needle is placed into the medullary cavity in the operation, the medullary cavity must be reamed, namely, the whole medullary cavity is scraped and pinned by a tool to be reamed so as to be placed into the intramedullary needle; during operation, a guide pin for guiding is inserted into the medullary cavity, then a hollow reaming drill is inserted along the guide pin, and the reaming drill is rotated to be drilled into the medullary cavity from one end of the femur or the tibia and gradually enter the medullary cavity. The marrow enlargement has the following advantages: 1. the contact area between the intramedullary needle inserted after the medulla is enlarged and the bone is increased, thereby improving the stability; 2. the intramedullary pin with larger diameter can be applied after the medulla is enlarged, thereby increasing the strength of the intramedullary pin and reducing the broken nail rate; 3. the bone fragments after the marrow enlargement can induce the formation of new bones, which is beneficial to the healing of fracture.

When the medullary cavity enlarging drill is used in the operation, bone chips may be attached to the inner hole of the drill, which affects the operation, so that the bone chips are discharged by pressurizing the drill handle part to the drill bit part by using the bone guide needle.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: in order to solve the problem that bone chips cannot be smoothly discharged due to the fact that a medullary cavity expanding drill is long and a bone guide needle cannot be stressed in the prior art, the medullary cavity expanding drill is provided.

In order to solve the technical problems, the utility model adopts the following technical scheme: the medullary cavity expanding drill comprises a body, wherein the body comprises a drill handle, a connecting piece and a drill bit which are sequentially connected, the body is of a hollow structure and can be used for inserting a guide pin, and the drill handle is provided with internal threads.

According to the technical scheme, the drill handle with the internal thread is adopted, the external thread matched with the internal thread of the drill handle is arranged at the tail end of the bone guide needle, and when the bone guide needle is used, the internal thread and the external thread are matched with each other, pressure is exerted by rotation, and bone fragments can be smoothly discharged.

Further, the coupling includes a spring that acts as a coupling between the drill bit and the drill shank, allowing the drill bit to flex to some degree to account for the complex intramedullary canal environment.

Furthermore, the connecting piece includes a plurality of springs, the spring cup joints from inside to outside in proper order, and adjacent two the spring spiral opposite direction, locate inboard the spring external diameter slightly is less than the internal diameter of locating the spring in the outside, adopts the spring that the spiral opposite direction as the connecting piece of drill bit and drill handle, can suitably bend when dealing with complicated pulp cavity environment, and two springs support each other simultaneously and can keep the hardness to make smooth entering of drill bit or withdraw from the pulp cavity.

Furthermore, one end, far away from the connecting piece, of the drill handle is a handle head, the section of the handle head comprises an arc section and a straight section, the arc section and the straight section are alternately distributed, a groove is formed in the drill handle and is located between the handle head and the connecting piece, and the handle head with the polygonal cross section and the groove in the drill handle can better transmit power.

The utility model has the beneficial effects that: the bone conduction needle adopts the drill handle with the internal thread, the tail end of the bone conduction needle is provided with the external thread matched with the internal thread of the drill handle, and when the bone conduction needle is used, the internal thread and the external thread are mutually matched and rotate to apply pressure, so that bone fragments can be smoothly discharged.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a front view of a medullary cavity reamer;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is a partial cross-sectional view of the first embodiment;

FIG. 5 is a partial sectional view of the second embodiment;

in the figure: 1. a body; 101. a drill shank; 102. a connecting member; 103. a drill bit; 1011. an internal thread; 1012. a groove; 1013. a crown.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 4, the utility model is a medullary cavity expanding drill, which comprises a body 1, wherein the body 1 comprises a drill handle 101, a connecting piece 102 and a drill bit 103 which are sequentially connected, the body 1 is of a hollow structure, the drill handle 101 is provided with internal threads 1011, the connecting piece 102 comprises a spring, a handle 1013 is arranged at one end of the drill handle 101 away from the connecting piece 102, the cross section of the handle 1013 comprises an arc section and straight sections, the arc section and the straight sections are alternately distributed, a groove 1012 is formed in the drill handle 101, and the groove 1012 is located between the handle 1013 and the connecting piece 102.

Example two:

as shown in fig. 1, 2, 3 and 5, the utility model is a medullary cavity expanding drill, which comprises a body 1, wherein the body 1 comprises a drill handle 101, a connecting piece 102 and a drill bit 103 which are sequentially connected, the body 1 is of a hollow structure, the drill handle 101 is provided with an internal thread 1011, the connecting piece 102 comprises a plurality of springs, the springs are sequentially sleeved from inside to outside, the spiral directions of two adjacent springs are opposite, the outer diameter of the spring arranged at the inner side is slightly smaller than the inner diameter of the spring arranged at the outer side, one end of the drill handle 101 far away from the connecting piece 102 is a handle head 1013, the cross section of the handle head 1013 comprises an arc section and a straight section, the arc section and the straight section are alternately distributed, a groove 1012 is formed on the drill handle 101, and the groove 1012 is positioned between the handle head 1013 and the connecting piece 102.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A medullary cavity enlarging drill is characterized in that: the drill bit comprises a body (1), the body comprises a drill handle (101), a connecting piece (102) and a drill bit (103) which are sequentially connected, the body (1) is of a hollow structure, and the drill handle (101) is provided with an internal thread (1011).

2. The medullary cavity enlarging drill according to claim 1, wherein: the connector (102) comprises a spring.

3. The medullary cavity enlarging drill according to claim 1, wherein: the connecting piece (102) comprises a plurality of springs, the springs are sequentially sleeved from inside to outside, the spiral directions of the adjacent springs are opposite, and the outer diameter of the spring arranged on the inner side is smaller than the inner diameter of the spring arranged on the outer side.

4. The medullary cavity enlarging drill according to claim 1, wherein: one end, far away from the connecting piece (102), of the drill handle (101) is provided with a handle head (1013), the cross section of the handle head (1013) comprises circular arc sections and straight line sections, and the circular arc sections and the straight line sections are alternately distributed.

5. The medullary cavity enlarging drill according to claim 1, wherein: the drill shank (101) is provided with a groove (1012), and the groove (1012) is positioned between the crown (1013) and the connecting piece (102).