An objective lens assembly for a 90° rigid tube endoscope

Abstract

The utility model relates to an objective lens assembly for a 90° rigid tube endoscope, and belongs to the field of medical devices. The utility model comprises a middle tube seal, a prism, an objective lens, a mounting seat, an inner tube, a middle tube and an objective lens protection sheet, wherein the prism and the objective lens are both mounted on the mounting seat, the mounting seat is mounted on one end of the inner tube, and the mounting seat is located inside the middle tube seal, the middle tube is sleeved outside the inner tube, and one end of the middle tube is connected to the middle tube seal, the objective lens protection sheet is mounted on the middle tube seal, and the objective lens protection sheet cooperates with the objective lens, the mounting seat is provided with a prism mounting groove, an objective lens mounting hole and a dispensing hole, the prism is mounted in the prism mounting groove, the objective lens is mounted in the objective lens mounting hole, the middle tube is laser welded to the middle tube seal, the objective lens protection sheet is metal brazed to the middle tube seal, and the prism mounting seat is bonded.

Description

Technical Field

[0001] The utility model relates to an objective lens assembly for a 90-degree hard tube endoscope, belonging to the field of medical equipment. Background Art

[0002] The rigid tube endoscope is a key instrument for minimally invasive surgery, among which the objective lens assembly of the rigid tube endoscope is the core part of the entire optical path. At present, the objective lens and prism in the rigid tube endoscope are respectively assembled in independent objective lens holders and prism holders, and then bonded. The assembly process is cumbersome and the positioning accuracy is not high. Since the two sides of the prism are positioned and bonded to the prism holder, the prism angle positioning is not accurate, which makes the transmitted image easy to deviate. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide an objective lens assembly for a 90° rigid tube endoscope with a reasonable structural design.

[0004] The technical solution adopted by the utility model to solve the above-mentioned problem is: the objective lens assembly for a 90° hard tube endoscope has the following structural features: it includes a middle tube seal, a prism, an objective lens, a mounting seat, an inner tube, a middle tube and an objective lens protection sheet, the prism and the objective lens are both mounted on the mounting seat, the mounting seat is mounted on one end of the inner tube, and the mounting seat is located in the middle tube seal, the middle tube is sleeved outside the inner tube, and one end of the middle tube is connected to the middle tube seal, the objective lens protection sheet is mounted on the middle tube seal, and the objective lens protection sheet cooperates with the objective lens.

[0005] Furthermore, a prism mounting groove is provided on the mounting seat, and the prism is mounted in the prism mounting groove.

[0006] Furthermore, an objective lens mounting hole is provided on the mounting seat, and the objective lens is mounted in the objective lens mounting hole.

[0007] Furthermore, a glue dispensing hole is provided on the mounting seat.

[0008] Furthermore, the middle tube and the middle tube seal are laser welded.

[0009] Furthermore, the objective lens protection plate is brazed with the middle tube sealing metal.

[0010] Furthermore, the prism is bonded to the mounting seat.

[0011] Compared with the prior art, the utility model has the following advantages: the mounting seat in the objective lens assembly for the 90° rigid tube endoscope can combine the objective lens seat and the prism seat in the prior art into one, that is, the mounting seat can be used to install the prism and the objective lens, so that the assembly process of the endoscope is simple and the positioning accuracy is high; at the same time, the bonding surface of the prism and the mounting seat is changed to two reflective surfaces, namely A and B surfaces, which can make the angle positioning more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the exploded structure of the objective lens assembly for a 90° rigid tube endoscope according to an embodiment of the utility model.

[0013] Figure 2 It is a schematic cross-sectional structure diagram of an objective lens assembly for a 90° rigid tube endoscope according to an embodiment of the utility model.

[0014] In the figure: middle tube seal 1, prism 2, objective lens 3, mounting seat 4, inner tube 5, middle tube 6, objective lens protection sheet 7, support rib 8,

[0015] Prism mounting groove 41 , objective lens mounting hole 42 , glue dispensing hole 43 . DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0017] Example

[0018] See also Figure 1 to Figure 2 As shown, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, if there are references to terms such as "upper", "lower", "left", "right", "middle" and "one" in this specification, they are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship, without substantially changing the technical content, should also be regarded as the scope of the implementation of the utility model.

[0019] The objective lens assembly for a 90° rigid tube endoscope in this embodiment includes a middle tube seal 1, a prism 2, an objective lens 3, a mounting seat 4, an inner tube 5, a middle tube 6 and an objective lens protection sheet 7. The prism 2 and the objective lens 3 are both mounted on the mounting seat 4. Normally, the prism 2 is bonded to the mounting seat 4.

[0020] The mounting seat 4 in this embodiment is mounted on one end of the inner tube 5, and the mounting seat 4 is located in the middle tube seal 1. The middle tube 6 is sleeved outside the inner tube 5, and one end of the middle tube 6 is connected to the middle tube seal 1. Usually, the middle tube 6 and the middle tube seal 1 are laser welded.

[0021] The objective lens protection plate 7 in this embodiment is installed on the middle tube seal 1. Normally, the objective lens protection plate 7 is metal-brazed with the middle tube seal 1, and the objective lens protection plate 7 cooperates with the objective lens 3. The mounting seat 4 is provided with a prism mounting groove 41, an objective lens mounting hole 42 and a glue dispensing hole 43. The prism 2 is installed in the prism mounting groove 41, and the objective lens 3 is installed in the objective lens mounting hole 42.

[0022] Specifically, the middle tube seal 1 and the middle tube 6 in the objective lens assembly for the 90° rigid tube endoscope are laser welded in a whole circle so that the product can be sterilized by high temperature and high pressure sterilization; a support rib 8 is integrally arranged on the middle tube seal 1 so that the middle tube seal 1 can be effectively positioned in the outer tube of the endoscope, rather than in a free state, to facilitate the assembly of the light-guiding fiber; the middle tube 6 and the inner tube 5 are designed with a double layer, and the middle tube 6 and the parts welded thereto form a sealed cavity so that the product can be sterilized by high temperature and high pressure sterilization; the objective lens protection sheet 7 and the middle tube seal 1 are metal brazed so that the product can be sterilized by high temperature and high pressure sterilization; the glue dispensing hole 43 can make the adhesive more evenly and easily penetrate into the bonding surface; in the present application, the outer tube, outer tube seal, light-guiding optical fiber, and optical lens behind the prism in the 90° rigid tube endoscope are omitted.

[0023] It should be noted that 90° means that the axis of the objective lens 3 and the axis of the inner tube 5 form an angle of 90°. Figure 2 The green dashed line in the figure represents the simulated light path.

[0024] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. An objective lens assembly for a 90° rigid tube endoscope, characterized in that: The invention comprises a middle tube seal (1), a prism (2), an objective lens (3), a mounting seat (4), an inner tube (5), a middle tube (6) and an objective lens protection sheet (7), wherein the prism (2) and the objective lens (3) are both mounted on the mounting seat (4), the mounting seat (4) is mounted on one end of the inner tube (5), and the mounting seat (4) is located inside the middle tube seal (1), the middle tube (6) is sleeved outside the inner tube (5), and one end of the middle tube (6) is connected to the middle tube seal (1), and the objective lens protection sheet (7) is mounted on the middle tube seal (1), and the objective lens protection sheet (7) cooperates with the objective lens (3).

2. The objective lens assembly for a 90° rigid tube endoscope according to claim 1, characterized in that: The mounting seat (4) is provided with a prism mounting groove (41), and the prism (2) is mounted in the prism mounting groove (41).

3. The objective lens assembly for a 90° rigid tube endoscope according to claim 1, characterized in that: An objective lens mounting hole (42) is provided on the mounting seat (4), and the objective lens (3) is mounted in the objective lens mounting hole (42).

4. The objective lens assembly for a 90° rigid tube endoscope according to claim 1, characterized in that: The mounting seat (4) is provided with a glue-dispensing hole (43).

5. The objective lens assembly for a 90° rigid tube endoscope according to claim 1, characterized in that: The middle tube (6) and the middle tube seal (1) are laser welded.

6. The objective lens assembly for a 90° rigid tube endoscope according to claim 1, characterized in that: The objective lens protection sheet (7) is metal-brazed with the middle tube seal (1).

7. The objective lens assembly for a 90° rigid tube endoscope according to claim 1, characterized in that: The prism (2) is bonded to the mounting seat (4).

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