CN216908056U - Connecting structure of inner knife assembly and outer knife assembly and medical knife - Google Patents

Abstract

The utility model provides a connection structure of an inner knife assembly and an outer knife assembly and a medical knife, comprising an outer knife assembly and an inner knife assembly, wherein the inner knife assembly includes an inner knife tube and a supporting part which is connected with the inner knife tube and transmits torsion force , the inner knife tube is rotatably sleeved in the outer knife assembly, a rolling body is arranged between the support member and the outer knife assembly, and/or between the rolling body and the outer knife assembly and/or the rolling body and the outer knife assembly Rolling friction is formed between the supporting parts; the medical knife is provided with a connection structure of the inner knife assembly and the outer knife assembly. Through the formation of rolling friction between the rolling element and the outer knife assembly and/or between the rolling element and the supporting member, the friction force is reduced, which is beneficial to the rotation of the inner knife assembly, and at the same time, the heat generated by friction is also reduced, thereby improving the external The service life of the knife assembly, the rolling body, and the inner knife assembly is improved, thereby improving the reliability of the medical knife and saving the cost.

Description

Connection structure of inner knife assembly and outer knife assembly and medical knife

technical field

The utility model belongs to the field of medical instruments, in particular to a connection structure of an inner knife assembly and an outer knife assembly and a medical knife.

Background technique

With the development of medical technology, grinding drills, planing knives and other medical knives are widely used in surgical operations. Such medical knives are mainly composed of handles and knives, and knives are mainly composed of outer knife components and inner knife components, and the power is connected through the handle. The inner knife assembly that drives the knife rotates at high speed, and grinds the tissue through the working part of the knife. In the prior art, plastic gaskets or gaskets of other materials are directly used for transition support between the inner knife assembly and the outer knife assembly of the tool, and the contact mode between the inner knife assembly/outer knife assembly and the gasket is face-to-face Contact, during the relative rotation of the inner knife assembly and the outer knife assembly, a large friction force will be generated with the gasket, which is not only unfavorable for the rotation of the inner knife assembly and the outer knife assembly, but also generates a lot of heat and damages the inner knife assembly. , outer knife components or gaskets, thereby reducing service life and increasing costs.

Utility model content

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a connection structure between the inner knife assembly and the outer knife assembly, so as to reduce the friction when the inner knife assembly and the outer knife assembly rotate relative to each other, thereby reducing frictional heat, Improve the service life of medical tools and reduce costs.

In order to achieve the above purpose and other related purposes, the utility model provides a connection structure of an inner knife assembly and an outer knife assembly, including an outer knife assembly and an inner knife assembly, and the inner knife assembly includes an inner knife tube and is connected with the inner knife tube. A supporting member that transmits torsion force, the inner knife tube is rotatably sleeved in the outer knife assembly, a rolling body is arranged between the supporting member and the outer knife assembly, and the rolling body and the outer knife assembly are arranged between the rolling body and the outer knife assembly And/or rolling friction is formed between the rolling elements and the support member.

Optionally, the outer knife assembly is located in front of the support member, and the rolling body is disposed between the front end face of the support member and the rear end face of the outer knife assembly.

Optionally, a retainer is provided between the front end surface of the support member and the rear end surface of the outer knife assembly, and the retainer is provided with mounting holes for installing rolling bodies, and the rolling bodies are rotatably installed on the mounting bracket. in the hole, and the rolling bodies are respectively in contact with the front end surface of the support member and the rear end surface of the outer knife assembly.

Optionally, the front end surface of the support member is provided with an installation groove, and the rolling body is installed in the installation groove and is in contact with the rear end surface of the outer knife assembly; or the rear end surface of the outer knife assembly is provided with a mounting groove. The rolling element is installed in the installation groove and is in contact with the front end surface of the support member.

Optionally, the rolling bodies are metal balls, and the metal balls are at least three and distributed along the circumference of the inner knife tube.

Optionally, the support member includes a support body for receiving torsion force and a connection seat connected with the front part of the support body, the connection seat is sleeved outside the inner knife tube, and is circumferentially fixed with the inner knife tube; The retainer is mounted on the connecting seat.

Optionally, the retainer is an annular structure, the retainer is sleeved outside the connecting seat, and can rotate circumferentially relative to the connecting seat, and the connecting seat is provided with a limit structure for limiting the axial position of the retainer. .

Optionally, the mounting hole is a through hole penetrating the cage in the axial direction of the inner knife tube, and the rolling elements are exposed at both ends of the mounting hole, and the diameter of one end of the mounting hole close to the outer knife assembly is smaller than the diameter of the rolling element. diameter to limit the rolling body from the cage.

Optionally, the cage is made of elastic non-metallic material.

The utility model also provides a medical knife, which comprises the connection structure of the inner knife assembly and the outer knife assembly.

As mentioned above, the connection structure of the inner knife assembly and the outer knife assembly and the medical knife of the present invention have the following beneficial effects: through the formation of rolling between the rolling body and the outer knife assembly and/or between the rolling body and the supporting member friction, thereby reducing the friction force, which is beneficial to the rotation of the inner knife assembly, and at the same time reduces the heat generated by friction, thereby improving the service life of the outer knife assembly, the rolling body, and the inner knife assembly, thereby improving the reliability of medical knives. sex, saving costs.

Description of drawings

Fig. 1 is the structural representation of one embodiment of the utility model;

2 is an exploded view of an embodiment of the present utility model;

Fig. 3 is the enlarged cutaway schematic diagram of I in Fig. 1;

FIG. 4 is a schematic axonometric view of a cage according to an embodiment of the present invention;

5 is a cross-sectional view of an inner knife assembly according to an embodiment of the present invention;

6 is a cross-sectional view of an inner knife assembly according to another embodiment of the present invention;

FIG. 7 is a cross-sectional view of an inner knife assembly according to still another embodiment of the present invention.

Part number description:

1-outer knife assembly; 1a-rear end face of outer knife assembly; 2-retainer; 2a-installation hole; 2b-limiting boss; 3-rolling body; 4-inner knife assembly; 41-support part; 41a- 411-connecting seat; 411a-limiting structure; 411b-installation groove; 412-support body; 412a-second installation groove; 42-inner knife tube.

Detailed ways

The embodiments of the present invention are described below by specific embodiments, and those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

In this example, the side of the medical tool facing the patient during use is taken as the front, and the side away from the patient is defined as the rear. In this example, a grinding tool is used as an example.

As shown in Figures 1-3, a connection structure between an inner knife assembly and an outer knife assembly shown in this example includes an outer knife assembly 1 and an inner knife assembly 4, wherein the inner knife assembly 4 includes an inner knife tube 42 and a support member 41. The support member 41 is connected with the inner knife tube 42 and can rotate synchronously to transmit the torque from the power handle to the inner knife tube 42, thereby driving the inner knife tube 42 to rotate and grind; the outer knife assembly 1 is sleeved on the inner knife tube In addition to 42, the two can rotate relative to each other in the circumferential direction; the key lies in: a rolling body 3 is arranged between the supporting member 41 and the outer knife assembly 1, between the rolling body 3 and the outer knife assembly 1 or between the rolling body 3 and the supporting member 41 Rolling friction is formed, or rolling friction is formed between the rolling element 3 and the outer knife assembly 1 and the supporting member 41; On the one hand, the sliding friction is changed to rolling friction, and on the other hand, the contact area is reduced, thereby reducing the friction force, which is beneficial to the rotation of the inner knife assembly 4, and at the same time reduces the heat generated by friction, thereby improving the outer knife assembly 1, rolling body 3, inner The service life of the knife assembly 4 saves the cost. The rolling body 3 can be a sphere, an annular body with a circular cross-section, or other components that can form rolling friction with the outer knife assembly 1 or/and the support member 41 , which can be selected according to specific needs.

The inner cutter tube 42 and the support member 41 may be connected by welding, bonding, screw connection or other forms of detachable fixed connection, and the support member 41 is connected with the inner cutter tube 42 and transmits torque. The meaning is the support member The connection between 41 and the outer knife tube 42 can rotate synchronously, so that the supporting member 41 can be driven to rotate, so that the inner knife tube 42 can follow the supporting member 41 to rotate.

In this embodiment, the support member 41 is connected to the rear of the inner knife tube 42, the outer knife assembly 1 is located in front of the support member 41, that is, the front end surface 41a of the support member 41 is opposite to the rear end surface 1a of the outer knife assembly, and the rolling elements 3 It is arranged between the front end face 41a of the support member 41 and the rear end face 1a of the outer knife assembly; by arranging the rolling elements 3 between the front end face 41a of the support member and the rear end face 1a of the outer knife assembly, compared with the traditional use of washers In the way, the friction area and the friction force during relative rotation are reduced, and the heat generated by friction is reduced; the installation method of the rolling body 3 can be installed by setting the cage, or the outer knife assembly 1 and the supporting member 41 are installed on the rolling body 3. The installation slot can be selected according to specific needs.

As shown in Figures 2-4, in this embodiment, a cage 2 is provided between the front end surface 41a of the support member and the rear end surface 1a of the outer knife assembly, and the cage 2 is provided with a mounting for mounting the rolling elements 3 Hole 2a, the rolling body 3 is rotatably installed in the mounting hole 2a, and the rolling body 3 is in contact with the front end surface 41a of the support member and the rear end surface 1a of the outer knife assembly; by setting the cage 2 to install the rolling body 3, with The structure is simple, the processing difficulty is reduced, and the assembly efficiency is improved. Rolling in the hole 2a causes rolling friction between the rolling element 3 and the front end surface 41a of the support member and between the rolling element 3 and the rear end surface 1a of the outer knife assembly respectively.

The retainer 2 can be fixedly arranged on the outer knife assembly 1 or the support member 41 , and the retainer 2 can also be arranged on the outer knife assembly 1 or the support member 41 in a circumferential direction relative to the inner knife tube 42 .

In this embodiment, the rolling bodies 3 are metal balls, such as steel balls (or balls), iron balls, etc. There are at least three metal balls, which are distributed along the circumferential direction of the inner knife tube 42; in this example The use of steel balls has the advantages of simple structure, convenient production and low cost; the steel balls can be three, four or other numbers, here four steel balls are selected, without increasing the number of steel balls , the reliability of the support member 41 when it is rotated can also be improved. The steel balls are evenly distributed along the circumference of the inner knife tube 42, or they can be unevenly distributed along the circumference of the inner knife tube 42. Here, the steel balls are preferably evenly distributed along the inner knife tube 42, which can ensure that the steel balls are evenly stressed, thereby improving the external The reliability of the use of the knife assembly 1 and the support member 41 .

As shown in FIG. 3 , in this embodiment, the support member 41 includes a support body 412 for receiving torsion force and a connection seat 411 connected to the front of the support body, the connection seat 411 is sleeved outside the inner knife tube 42, It is circumferentially fixed with the inner knife tube 42. In this example, the connecting seat 411 is welded to the outer wall of the inner knife tube 42, and the front end of the support body 412 is circumferentially fixedly connected with the connecting seat 411, such as through grooves and protrusions. The rolling body 3 is arranged between the connecting seat 411 and the outer knife assembly 1; in this example, the cage 2 is installed on the connecting seat 41, and the cage and the connecting seat are circumferentially fixed or relatively rotatable.

In this example, the cage 2 and the connecting seat 411 are relatively rotatable. When the connecting seat 411 rotates relative to the outer knife assembly 1, the rolling body 3 rotates in the mounting hole 2a, and at the same time drives the cage 2 rotation, can reduce the friction between the rolling element 3 and the cage 2, the cage 2 and the connecting seat 411 adopt a small clearance fit, so that the cage will not occur along the diameter of the inner knife tube 42 when the cage rotates Shake to improve the stability of the working state.

In another embodiment, the retainer 2 and the connecting seat 411 can be fixed in the circumferential direction, which can avoid the wear between the retainer and the connecting seat, such as interference connection, snap connection or other forms. fixed connection.

As shown in FIG. 4 , the connecting seat 411 includes a tubular main body and a retaining ring connected to the rear of the main body. The rolling element 3 is sandwiched between the retaining ring and the rear end surface 1a of the outer knife assembly. The cage 2 is an annular structure. It is sleeved outside the main body of the connecting seat and can rotate relative to the connecting seat 411 in the circumferential direction. The main body of the connecting seat is provided with a limiting structure 411a for limiting the axial position of the cage; At the same time, the cage 2 can also rotate relative to the main body of the connecting seat in the circumferential direction, thereby reducing the friction between the rolling elements 3 and the cage. By setting the limit structure 411a to limit the axial position of the cage, Preventing the cage 2 from moving along the axial direction of the cage not only facilitates the assembly of the cage, thereby improving the assembly efficiency, but also improves the reliability of the cage.

The limiting structure 411a is an annular protrusion 411a disposed on the main body of the connecting seat, and the outer diameter of the annular protrusion is larger than the inner diameter of the cage; A clamp ring groove for installing the clamp ring is opened, and the clamp ring is installed in the clamp ring groove while limiting the position of the cage along the axial direction of the cage.

As shown in FIG. 4 , in this embodiment, the mounting hole 2a is a through hole penetrating the cage along the axial direction of the inner knife tube 42, and the rolling elements 3 are exposed at both ends of the mounting hole 2a, and the mounting hole 2a is close to the outer knife The diameter of one end (front end) of the assembly 1 is smaller than the diameter of the rolling element 3, which restricts the rolling element 3 from sliding out of the mounting hole 2a; In between, the steel ball can be prevented from falling off, and it is convenient to install the steel ball and the cage on the support member 41 and then assemble with the outer knife assembly 1, thereby improving the assembly efficiency. Of course, the mounting holes can also be set in the form of tapered holes, which can be selected according to specific needs.

In this embodiment, the retainer 2 is made of elastic non-metallic material; the elastic non-metallic material is used, so that the retainer 2 can be directly sleeved over the annular protrusion 411a, which facilitates the assembly of the retainer.

As shown in FIG. 6 , in one embodiment, a mounting groove 411b is defined on the front end surface 41a of the support member, and the rolling element 3 is mounted in the mounting groove 411b and is in contact with the rear end surface 1a of the outer knife assembly Of course, an installation groove can also be opened on the rear end face 1a of the outer knife assembly, and the rolling body 3 is installed in the installation groove and is in contact with the front end face 41a of the support member; The rear end surface 1a has an installation groove for installing the rolling element 3, and the rolling element 3 is installed in the installation groove, which not only increases the compactness of the structure, but also reduces the weight of the outer knife assembly 1 or the support member 41.

As shown in FIG. 7 , the connecting seat 411 is not provided in this example, and the supporting member 41 includes a supporting body 412, which is directly connected to the inner cutter tube 42 to transmit torque, such as glue connection or screw connection (rotation direction and thread direction). On the contrary); at this time, a second installation groove 412a can be opened directly on the front end surface of the support body or the rear end surface of the outer knife assembly 1 to install the rolling body 3 .

The utility model also provides a medical knife, wherein the medical knife is provided with the connecting structure of the inner knife assembly and the outer knife assembly. Medical knives can be grinders, planers, and the like.

In the present invention, rolling friction is formed between the rolling element 3 and the outer knife assembly 1 and/or between the rolling element 3 and the supporting member 41, thereby reducing the frictional force, which is beneficial to the rotation of the inner knife assembly 4, and also reduces the The heat generated by friction increases the service life of the outer knife assembly 1, the rolling body 3 and the inner knife assembly 4, thereby improving the reliability of the medical knife and saving the cost.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims (10)

1. a connection structure of an inner knife assembly and an outer knife assembly, comprising an outer knife assembly and an inner knife assembly, and the inner knife assembly includes an inner knife tube and a support member that is connected with the inner knife tube and transmits torsion, the inner knife The tube is rotatably sleeved in the outer knife assembly, and is characterized in that: a rolling body is arranged between the support member and the outer knife assembly, and/or between the rolling body and the outer knife assembly and/or between the rolling body and the support Rolling friction occurs between the components. 2 . The connection structure of the inner knife assembly and the outer knife assembly according to claim 1 , wherein the outer knife assembly is located in front of the support member, and the rolling body is arranged on the front end surface and the outer face of the support member. 3 . between the rear faces of the knife assemblies. 3 . The connection structure of the inner knife assembly and the outer knife assembly according to claim 2 , wherein a cage is provided between the front end surface of the support member and the rear end surface of the outer knife assembly, and the cage is mounted on the cage. 4 . Mounting holes for mounting rolling bodies are provided, the rolling bodies are rotatably mounted in the mounting holes, and the rolling bodies are respectively in contact with the front end surface of the support member and the rear end surface of the outer knife assembly. 4 . The connection structure between the inner knife assembly and the outer knife assembly according to claim 2 , wherein an installation groove is formed on the front end surface of the support member, and the rolling body is installed in the installation groove and is connected with the The rear end surface of the outer knife assembly is in contact; or the rear end surface of the outer knife assembly is provided with an installation groove, and the rolling body is installed in the installation groove and is in contact with the front end surface of the support member. 5. The connection structure of the inner knife assembly and the outer knife assembly according to any one of claims 1-4, characterized in that: the rolling bodies are metal balls, and the metal balls are at least three and extend along the inner knife Circumferential distribution of the tube. 6 . The connection structure of the inner knife assembly and the outer knife assembly according to claim 3 , wherein the supporting member comprises a supporting body for receiving torsion force and a connecting seat connected with the front part of the supporting body, and the The connecting seat is sleeved outside the inner knife tube, and is circumferentially fixed with the inner knife tube; the retainer is installed on the connecting seat. 7 . The connecting structure of the inner knife assembly and the outer knife assembly according to claim 6 , wherein the retainer is an annular structure, the retainer is sleeved outside the connecting seat, and can be circumferentially relative to the connecting seat. 8 . Rotating, the connecting seat is provided with a limiting structure for limiting the axial position of the cage. 8 . The connection structure of the inner knife assembly and the outer knife assembly according to claim 6 , wherein the mounting hole is a through hole penetrating the cage along the axial direction of the inner knife tube, and the rolling body is exposed from the mounting hole. 9 . The diameter of one end of the mounting hole close to the outer knife assembly is smaller than the diameter of the rolling body, so as to restrict the rolling body from separating from the cage. 9 . The connecting structure of the inner knife assembly and the outer knife assembly according to claim 3 , wherein the holder is made of elastic non-metallic material. 10 . 10. A medical knife, characterized in that: the medical knife comprises the connection structure of the inner knife assembly and the outer knife assembly according to any one of claims 1-9.

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