CN209843030U

CN209843030U - Demonstration model for adjusting crystalline lens during near object observation

Info

Publication number: CN209843030U
Application number: CN201822111301.8U
Authority: CN
Inventors: 边慧; 姜博奥; 李娇
Original assignee: Kunming Medical University
Current assignee: Kunming Medical University
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2019-12-24
Anticipated expiration: 2028-12-17

Abstract

The utility model relates to a demonstration model of adjustment of crystalline lens when looking near object includes: a lens model, a zonule of suspensory model, a ciliary muscle model, and a ciliary muscle adjusting handle; the method is characterized in that: the lens model is in a shape of a biconvex lens; the lens model is positioned at the central position, and the periphery of the lens model is connected with a suspension ligament model which is distributed in a radial shape; the outer side of the zonule model is connected with a circular ciliary muscle model; the outer side of the ciliary muscle model is provided with a ciliary muscle adjusting handle which is used for controlling the contraction and the relaxation of the ciliary muscle model. The model can dynamically demonstrate the adjusting process of the crystalline lens when viewing near objects, visualizes the relation among the crystalline lens, the zonules and the ciliary muscle, and is convenient for students to understand.

Description

Demonstration model for adjusting crystalline lens during near object observation

Technical Field

The utility model relates to a model for demonstrating the adjustment of crystalline lens during the process of looking at near objects, belonging to the technical field of medical teaching equipment.

Background

Physiology is the foundation of medical education, and the complex concept and strong theoretical property are the subject characteristics. Such as a knowledge point of the lens' accommodation when looking at near objects. When the eye is gazing at an object that is more than 6 meters, all incoming rays from the object into the eye can be considered parallel rays, and for a normal eye, a clear image can be formed on the retina without any adjustment. When the eye is gazing at an object within 6 meters or the object to be viewed moves from far to near, a series of accommodation will occur, the most significant of which is the accommodation of the crystalline lens. Accommodation of the lens is controlled by the relaxation of the ciliary muscle, but the lens and ciliary muscle are not directly connected, but indirectly connected by the zonules. Therefore, how to clear the relationship between the ciliary muscle, zonules, and the crystalline lens is an important teaching point and difficulty. The following problems exist in the current teaching process: the accommodation process of the crystalline lens is abstract and complex when viewing near objects, the multimedia courseware only can indirectly show a schematic diagram, and the existing teaching mould only displays a static structure, so that students cannot imagine the dynamic process, and the understanding of the students is obstructed, thereby influencing the learning effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a simple structure, convenient to use makes the regulation demonstration model of crystalline lens when looking near the thing that abstract complicated physiology knowledge becomes directly perceived easily.

The utility model provides a technical scheme is:

the utility model discloses a demonstration model of adjustment of crystalline lens when looking at near-object includes: a crystalline lens model (1), a zonule suspensor model (2), a ciliary muscle model (3) and a ciliary muscle adjusting handle (4); the method is characterized in that: the lens model (1) is in a shape of a biconvex lens; the lens model (1) is positioned at the central position, and the periphery of the lens model is connected with the zonule models (2) which are distributed in a radial shape; the outer side of the zonule model (2) is connected with a circular ciliary muscle model (3); and a ciliary muscle adjusting handle (4) is arranged on the outer side of the ciliary muscle model (3).

The lens model is an elastic round body.

The suspensory ligament model (2) is composed of a plurality of elastic ropes.

The ciliary muscle model (3) is an elastic circular ring.

The ciliary muscle adjusting handles (4) are symmetrically distributed along the outer side of the ciliary muscle model (3).

The utility model has the advantages and beneficial effects that:

1. the adjusting process of the crystalline lens during the process of viewing near objects is dynamically demonstrated, the relation among the crystalline lens, the zonules and the ciliary muscle is visualized, and the student can understand the adjusting process conveniently.

2. Simple structure, convenient use and self-operation by students.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of the present invention;

FIG. 3 is a schematic sectional view of the present invention;

FIG. 4 is a cross-sectional view illustrating the convex appearance of the lens according to the present invention;

figure 5 is a top view of the present invention demonstrating lenticular lens becoming convex

In the above drawings: 1. a model of the lens; 2. a zonule model; 3. a ciliary muscle model; 4. the ciliary muscle adjusts the handle.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. The demonstration model of the accommodation of the lens in near view of the present example was made by a conventional method using commercially available materials.

The utility model discloses a demonstration model of adjustment of crystalline lens when looking at near-object includes: a crystalline lens model 1, a zonule suspensor model 2, a ciliary muscle model 3 and a ciliary muscle adjusting handle 4; the method is characterized in that: the lens model 1 is in a biconvex lens shape; the lens model 1 is positioned at the central position, and the periphery of the lens model is connected with the zonule models 2 which are distributed in a radial shape; the outer side of the zonule model 2 is connected with a circular ciliary muscle model 3; and a ciliary muscle adjusting handle 4 is arranged on the outer side of the ciliary muscle model 3.

The lens model is a biconvex transparent body.

The suspensory ligament model 2 is composed of a plurality of elastic ropes.

The ciliary muscle model 3 is an elastic circular ring.

The ciliary muscle adjusting handles 4 are symmetrically distributed along the outer side of the ciliary muscle model 3.

The utility model discloses the use:

as shown in fig. 1, 2 and 3, when the process of viewing objects is demonstrated, the ciliary muscle adjusting handle 4 is lightly held by two hands without applying other external force, the ciliary muscle model 3 is in a relaxed state, the zonule model 2 keeps a certain tension, and the crystalline lens model 1 is pulled by the zonule model 2, is relatively flat in shape and weak in refractive power.

As shown in fig. 4 and 5, when the process of demonstrating near objects is performed, the ciliary muscle adjusting handle 4 is forcibly held and pressed inward by both hands, the ciliary muscle model 3 is in a contracted state, the zonule 2 model connected therein is relaxed, the lens model 1 is projected forward and backward due to its own elasticity, the surface curvature is increased, and the refractive power is increased.

Practical application shows that the model is simple in structure, low in cost and very convenient to use.

Claims

1. A model for demonstrating accommodation of the lens in near vision comprising: a crystalline lens model (1), a zonule suspensor model (2), a ciliary muscle model (3) and a ciliary muscle adjusting handle (4); the method is characterized in that: the lens model (1) is in a shape of a biconvex lens; the lens model (1) is positioned at the central position, and the periphery of the lens model is connected with the zonule models (2) which are distributed in a radial shape; the outer side of the zonule model (2) is connected with a circular ciliary muscle model (3); and a ciliary muscle adjusting handle (4) is arranged on the outer side of the ciliary muscle model (3).

2. A model for demonstrating the accommodation of the lens in near vision according to claim 1, wherein: the lens model is an elastic biconvex transparent body.

3. A model for demonstrating the accommodation of the lens in near vision according to claim 1, wherein: the suspensory ligament model (2) is composed of a plurality of elastic ropes.

4. A model for demonstrating the accommodation of the lens in near vision according to claim 1, wherein: the ciliary muscle model (3) is an elastic circular ring.

5. A model for demonstrating the accommodation of the lens in near vision according to claim 1, wherein: the ciliary muscle adjusting handles (4) are symmetrically distributed along the outer side of the ciliary muscle model (3).