Wireless capsule endoscope bow-shaped wall-attached antenna

Abstract

A wireless capsule endoscope bow-shaped wall-attached antenna in the technical field of clinical medical auxiliary equipment comprises a long straight-line radiating patch integrally formed on the outer wall of a capsule shell and a left radiating patch area and a right radiating patch area arranged on the same side of the long straight-line radiating patch to form a loop with the long straight-line radiating patch; the left radiating patch area is provided with left rectangular, left bow-shaped and left inverted L-shaped radiating patches connected in sequence from bottom to top; the right radiating patch area is provided with right rectangular, right bow-shaped and right inverted L-shaped radiating patches connected in sequence from bottom to top; each radiating patch in the left radiating patch area and the corresponding radiating patch in the right radiating patch area are of the same size and are arranged opposite to each other along the circumference of the capsule shell. The present invention adopts a loop structure, reduces the area of ​​the antenna, simplifies the antenna manufacturing, reduces the difficulty of attachment, and maintains a high data transmission rate and a strong anti-interference ability while reducing the size.

Description

Technical Field

[0001] The present invention relates to a technology in the field of clinical medical auxiliary equipment, in particular to a bow-shaped wall-attached antenna for a wireless capsule endoscope. Background Art

[0002] Gastrointestinal diseases are diseases that occur in the digestive tract (gastrointestinal tract). Common types include bleeding, ulcers, and tumors. This disease is common throughout the world and involves a wide range of age groups. From infants to the elderly, it is a frequent disease. Since most gastrointestinal diseases can be controlled or even cured in their early stages, humans have invented a variety of technologies to help detect the gastrointestinal tract of the human body. For example: angiography, ultrasonography, X-rays, and scintigraphy. However, these technologies are indirect diagnostic techniques, especially when detecting symptoms such as gastrointestinal bleeding, because it is difficult to locate the exact location of intermittent bleeding, the diagnosis rate is very low.

[0003] In the 19th century, a wired endoscope (also called a gastroenteroscope) was invented. It allows humans to fully observe the stomach, small intestine, and upper part of the colon. However, this detection method causes great discomfort to patients, and other parts of the small intestine also become blind spots for detection.

[0004] In the early 20th century, wireless capsule endoscope, a medical auxiliary device that can replace gastroscope and colonoscope, was born. It makes it possible to detect the complete stomach and small intestine. Compared with traditional endoscopes, when using capsule endoscopes, doctors do not need to insert the endoscope with a hose into the patient's body, which greatly improves the patient's comfort during the visit. At the same time, patients can maintain normal activities and lives. This capsule endoscope that can be swallowed by humans has greatly reduced the risk of surgery with its smaller size and has been recognized by the medical community.

[0005] The wireless capsule endoscope is a small electronic medical device in the shape of a capsule, which is composed of components such as a built-in LED (providing light source), an imaging system (capturing images), a variety of sensors, a battery (providing power), a transmitting module and an antenna (transmitting and processing signals). Take the currently used M2A capsule endoscope (11mm×27mm in size) as an example. It was developed by Olympus Pharmaceuticals and can work continuously for 7 to 8 hours after being swallowed, during which time the digestive system is photographed at a rate of two frames per second and about 50,000 color images are obtained. The capsule shell is sealed with special biological materials that can resist gastric acid and powerful digestive enzymes. After being swallowed by the patient, the capsule endoscope can be slowly pushed forward or stopped at the site of the disease by the traction of the peristalsis of the digestive tract or the positioning control system, providing an effective means of inspection for the entire small intestine of up to 5 to 7 meters.

[0006] At present, there are two types of antennas in capsule endoscopes: three-dimensional antennas inside capsules and antennas attached to the outer wall of capsules. For three-dimensional antennas inside capsules, they occupy space inside the capsule and are limited by the size of the capsule shell, making it difficult to improve the patient's comfort while having good stability; for antennas attached to the outer wall of capsules, the bandwidth of antennas attached to the outer wall of capsules with a center frequency below 1GHz is only 260MHz, while the center frequency of antennas attached to the outer wall of capsules with a bandwidth of more than 300MHz is higher than 1GHz, making it difficult to achieve a balance in terms of capsule size, power consumption and stability. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the present invention proposes a bow-shaped wall-attached antenna for a wireless capsule endoscope, which adopts a loop structure, reduces the area of ​​the antenna, simplifies the antenna manufacturing, reduces the difficulty of attachment, and maintains a high data transmission rate and strong anti-interference ability while reducing the size.

[0008] The present invention is achieved through the following technical solutions:

[0009] The present invention comprises a long straight-line radiation patch integrally formed on the outer wall of the capsule shell, and a left radiation patch area and a right radiation patch area arranged on the same side of the long straight-line radiation patch to form a loop with the long straight-line radiation patch;

[0010] The left radiation patch area is provided with a left rectangular radiation patch, a left bow-shaped radiation patch and a left inverted L-shaped radiation patch connected in sequence from bottom to top;

[0011] The right radiation patch area corresponds to each radiation patch in the left radiation patch area and is provided with a right rectangular radiation patch, a right bow-shaped radiation patch and a right inverted L-shaped radiation patch connected in sequence from bottom to top;

[0012] Each radiation patch in the left radiation patch area and the corresponding radiation patch in the right radiation patch area have the same size, are arranged opposite to each other along the circumference of the capsule shell, and have the same height at corresponding locations.

[0013] Preferably, the left rectangular radiation patch and the left inverted L-shaped radiation patch are connected to the head and tail ends of the left bow-shaped radiation patch, and the right rectangular radiation patch and the right inverted L-shaped radiation patch are connected to the head and tail ends of the right bow-shaped radiation patch.

[0014] Preferably, the left rectangular radiation patch and the right rectangular radiation patch are bandgap radiation patches, and the gap is arranged parallel to the long straight radiation patch; the length is greater than 1mm and not greater than 7mm, and the width is 0.15-3mm.

[0015] Preferably, the length of the longer side of the left and right inverted L-shaped radiation patches around the circumference of the capsule shell is 2-14 mm, the height is 1.5-6.8 mm, and the horizontal and vertical widths are 1-5 mm respectively.

[0016] The radius of the outer wall of the capsule shell is 1.7-5.5mm, and the height is 16.5-27mm; the long straight-line radiation patch is 8.25-25mm long, 0.5-5mm high, and the bottom is 0.5-4mm away from the bottom of the capsule shell side wall; the left rectangular radiation patch and the right rectangular radiation patch are 1-8mm long, 1-5mm high, and the length of the longer side of the left bow-shaped radiation patch and the right bow-shaped radiation patch around the circumference of the capsule shell is 2.5-13.5mm, the height is 3.5-14mm, and the width is 0.5-2mm.

[0017] The capsule shell is cylindrical and is surrounded by a rectangular substrate with a dielectric constant of 2.2 to 4.4. The thickness of the rectangular substrate is 0.25 to 1.5 mm.

[0018] The material of the rectangular substrate includes but is not limited to polytetrafluoroethylene, glass fiber reinforced polytetrafluoroethylene, and glass fiber epoxy resin.

[0019] Preferably, the wireless capsule endoscope bow-shaped wall-attached antenna is obtained by etching a substrate made of any one of copper foil, silver paste, and gold powder. The wireless capsule endoscope bow-shaped wall-attached antenna is covered with a thin film and is integrally attached to a rectangular substrate that forms a capsule shell.

[0020] Preferably, the arcuate wall-attached antenna of the wireless capsule endoscope is obtained by printing any one of copper, silver and gold conductive metal substrates on a rectangular substrate surrounding the capsule shell.

[0021] The thickness of the arcuate wall-attached antenna of the wireless capsule endoscope is 0.018-0.035 mm.

[0022] Technical Effects

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] 1) By using the loop method, the working frequency band below -10dB is 312~563MHz (bandwidth is 251MHz), and the center frequency is 403MHz, which reduces the area of ​​the antenna, simplifies the antenna production, and reduces the difficulty of attachment;

[0025] 2) The overall size of the wireless capsule endoscope is reduced, and the scope of endoscope application is expanded to children, while maintaining a faster data transmission rate and stronger anti-interference ability;

[0026] 3) Within the capsule shell thickness range of 0.52 to 1.33 mm and the capsule shell outer wall radius range of 2.7 to 5.1 mm, the frequency band width does not change much, which reduces the requirements for capsule shell production accuracy and helps reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the planar unfolded structure of Example 1;

[0028] Figure 2 This is the dimension diagram of Example 1;

[0029] Figure 3 This is a return loss diagram of Example 1;

[0030] Figure 4a The XY plane antenna pattern of Example 1 at 403 MHz;

[0031] Figure 4b The YZ plane antenna pattern of Example 1 at 403 MHz;

[0032] Figure 5a This is a graph showing the influence of the outer wall radius of the capsule shell on the bandwidth of the present invention;

[0033] Figure 5b This is a graph showing the influence of the thickness of the capsule shell on the bandwidth of the present invention;

[0034] In the figure: long I-shaped radiation patch 1, left rectangular radiation patch 2, left bow-shaped radiation patch 3, left inverted L-shaped radiation patch 4, right rectangular radiation patch 5, right bow-shaped radiation patch 6, right inverted L-shaped radiation patch 7. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment includes a long straight-line radiation patch 1 integrally formed on the outer wall of the capsule shell, and a left radiation patch area and a right radiation patch area arranged on the same side of the long straight-line radiation patch 1 to form a loop with the long straight-line radiation patch 1. The bandwidth is increased by setting the left radiation patch area and the right radiation patch area;

[0038] The left radiation patch area is provided with a left rectangular radiation patch 2, a left bow-shaped radiation patch 3 and a left inverted L-shaped radiation patch 4 which are sequentially connected from bottom to top;

[0039] The right radiation patch area corresponds to each radiation patch in the left radiation patch area and is provided with a right rectangular radiation patch 5, a right bow-shaped radiation patch 6 and a right inverted L-shaped radiation patch 7 connected in sequence from bottom to top;

[0040] Each radiation patch in the left radiation patch area and the corresponding radiation patch in the right radiation patch area have the same size and are arranged opposite to each other along the circumference of the capsule shell; the left radiation patch area and the right radiation patch area are symmetrically arranged and have the same height at corresponding locations.

[0041] The left rectangular radiation patch 2 and the left inverted L-shaped radiation patch 4 are connected to the left bow-shaped radiation patch 3 at both ends, and the right rectangular radiation patch 5 and the right inverted L-shaped radiation patch 7 are connected to the right bow-shaped radiation patch 6 at both ends.

[0042] The outer wall radius of the capsule shell is 1.7-5.5 mm and the height is 16.5-27 mm.

[0043] The long straight-line radiation patch 1 has a length of 8.25-25 mm, a height of 0.5-5 mm, and a bottom distance from the bottom of the capsule shell side wall to 0.5-4 mm.

[0044] The left rectangular radiation patch 2 and the right rectangular radiation patch 5 are bandgap radiation patches with an overall length of 1 to 8 mm and a height of 1 to 5 mm; the gap is arranged parallel to the long straight-line radiation patch 1, with a distance of 0.75 mm from the top of the long straight-line radiation patch 1, a length greater than 1 mm and not greater than 7 mm, and a width of 0.15 to 3 mm.

[0045] The length of the longer side of the left bow-shaped radiation patch 3 and the right bow-shaped radiation patch 6 around the circumference of the capsule shell is 2.5-13.5 mm, the height is 3.5-14 mm, and the width is 0.5-2 mm.

[0046] The length of the longer side of the left inverted L-shaped radiation patch 4 and the right inverted L-shaped radiation patch 7 around the capsule shell is 2-14 mm, the height is 1.5-6.8 mm, and the horizontal and vertical widths are 1-5 mm respectively.

[0047] like Figure 2 As shown, preferably, the dimensions are shown in Table 1 below;

[0048] Table 1 Size table

[0049] Size No. b c d e f g h i j t z y q Dimensions (mm) 8.4 4 2 10.5 5.22 0.5 1.5 1 1.3 3.12 1.2 1.2 0.1

[0050] The outer wall radius of the capsule shell is 4.7 mm and the height is 26 mm. Compared with common capsule endoscopes, it is slightly smaller in size and can be swallowed by children.

[0051] The capsule shell is cylindrical and is surrounded by a rectangular substrate with a thickness of 0.79 mm; the rectangular substrate is made of polytetrafluoroethylene with a dielectric constant of 2.33.

[0052] In this embodiment, any one of copper, silver, and gold conductive metal substrates is printed on a rectangular substrate surrounding a capsule shell by 3D printing technology, and the antenna thickness is 0.035 mm.

[0053] The capsule endoscope with the antenna of this embodiment was placed in a human body model with a dielectric constant of 56.87, a conductivity of 0.8S / m, a diameter of 180mm and a height of 80mm for testing, and the test analysis was performed using CST (Computer Simulation Technology) software; the obtained S parameter curve is shown in FIG. Figure 3 As shown in the figure, it can be seen that the working frequency band below -10dB is 312~563MHz (bandwidth is 251MHz), and the center frequency is 403MHz.

[0054] Figure 4a and Figure 4b The E-plane and H-plane radiation patterns of the antenna at 403 MHz are shown respectively, with a gain of 4.0 dBi. It can be seen that the antenna of this embodiment achieves maximum coverage in multiple dimensions in the xy plane and yz plane. Therefore, the capsule endoscope can transmit signals to the outside of the body at most locations in the human small intestine and transmit image data for doctors to detect.

[0055] In addition, this embodiment studies the influence of the outer wall radius of the capsule shell and the thickness of the capsule shell on the change of the bandwidth, such as Figure 5a The outer wall radius of the capsule shell increases from 2.7 mm to 5.1 mm. Figure 5b The thickness of the capsule shell increases from 0.52 mm to 1.33 mm. It is found that within this range, the change in bandwidth is less affected by the thickness and radius of the capsule shell. This reduces the requirements of the antenna of this embodiment on the production accuracy of the capsule shell, which is beneficial to reducing production costs.

[0056] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A wireless capsule endoscope bow-shaped wall-attached antenna, characterized in that: It includes a long straight-line radiating patch integrally formed on the outer wall of the capsule shell, and a left radiating patch area and a right radiating patch area arranged on the same side of the long straight-line radiating patch to form a loop with the long straight-line radiating patch; The left radiation patch area is provided with a left rectangular radiation patch, a left bow-shaped radiation patch and a left inverted L-shaped radiation patch connected in sequence from bottom to top; Corresponding to each radiation patch in the left radiation patch area, the right radiation patch area is provided with a right rectangular radiation patch, a right bow-shaped radiation patch and a right inverted L-shaped radiation patch connected in sequence from bottom to top; Each radiation patch in the left radiation patch area and the corresponding radiation patch in the right radiation patch area have the same size, are arranged opposite to each other along the circumference of the capsule shell, and have the same height at the corresponding positions; The left rectangular radiation patch and the left inverted L-shaped radiation patch are connected to the first and last ends of the left bow-shaped radiation patch; The right rectangular radiation patch and the right inverted L-shaped radiation patch are connected to the first and last ends of the right bow-shaped radiation patch; The left rectangular radiation patch and the right rectangular radiation patch are bandgap radiation patches.

2. The arcuate wall-attached antenna of the wireless capsule endoscope according to claim 1, characterized in that: The gaps in the left rectangular radiation patch and the right rectangular radiation patch are arranged in parallel with the long straight radiation patch, with a length greater than 1 mm and less than 7 mm, and a width of 0.15 to 3 mm.

3. The arcuate wall-attached antenna of the wireless capsule endoscope according to claim 2, characterized in that: The length of the longer side of the left and right inverted L-shaped radiation patches around the capsule shell is 2-14 mm, the height is 1.5-6.8 mm, and the horizontal and vertical widths are 1-5 mm respectively.

4. The arcuate wall-attached antenna of the wireless capsule endoscope according to claim 1, characterized in that: The radius of the outer wall of the capsule shell is 1.7~5.5mm, and the height is 16.5~27mm; the long straight-line radiation patch is 8.25~25mm long, 0.5~5mm high, and the bottom is 0.5~4mm away from the bottom of the capsule shell side wall; the left rectangular radiation patch and the right rectangular radiation patch are 1~8mm long, 1~5mm high, and the length of the longer side of the left bow-shaped radiation patch and the right bow-shaped radiation patch around the circumference of the capsule shell is 2.5~13.5mm, the height is 3.5~14mm, and the width is 0.5~2mm.

5. The arcuate wall-attached antenna of the wireless capsule endoscope according to claim 4, characterized in that: The capsule shell is cylindrical and is surrounded by a rectangular substrate with a dielectric constant of 2.2-4.

4. The thickness of the rectangular substrate is 0.25-1.5 mm and the material is any one of polytetrafluoroethylene, glass fiber reinforced polytetrafluoroethylene and glass fiber epoxy resin.

6. The arcuate wall-attached antenna of the wireless capsule endoscope according to claim 5, characterized in that: The arcuate wall-attached antenna of the wireless capsule endoscope is obtained by etching a substrate made of any one material of copper foil, silver paste, and gold powder. The arcuate wall-attached antenna of the wireless capsule endoscope is covered with a layer of film and is integrally attached to a rectangular substrate surrounding a capsule shell through the film.

7. The arcuate wall-attached antenna of the wireless capsule endoscope according to claim 5, characterized in that: The arcuate wall-attached antenna of the wireless capsule endoscope is obtained by printing any one of copper, silver and gold conductive metal substrates on a rectangular substrate surrounding a capsule shell.

8. The arcuate wall-attached antenna for wireless capsule endoscope according to any one of claims 1 to 7, characterized in that: The thickness of the arcuate wall-attached antenna of the wireless capsule endoscope is 0.018-0.035 mm.

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