CN206225534U - A kind of wideband implanted human body antenna for being applied to portable medical - Google Patents

Abstract

The utility model discloses a broadband implantable human body antenna applied to mobile medical treatment, which comprises an antenna structure, a coaxial feed structure and a biocompatible coating structure. The antenna structure is composed of a radiation metal patch, a metal floor patch, a medium Composed of a substrate and a short-circuit probe, the radiation metal patch and the metal floor patch are respectively located on the upper and lower surfaces of the dielectric substrate, the short-circuit metal probe is connected to the radiation patch and the metal floor patch, and the coaxial feed The structure consists of a coaxial cable with a characteristic impedance of 50Ω. The broadband implantable human body antenna designed by the utility model works in the medical implantable communication service band (MICS), and has the characteristics of miniaturization, low profile, broadband, high robustness and biocompatibility.

Description

A broadband implantable human body antenna for mobile medicine

technical field

The utility model belongs to the field of mobile medical wireless communication, in particular to a broadband implanted human body antenna applied to mobile medical care.

Background technique

In recent years, the aging of the social population has continued to intensify, and the health problems caused by the increasing number of sub-healthy people have gradually become the focus of social attention. At the same time, with the vigorous development of the social economy and the continuous improvement of the quality of social life, people have higher requirements for the quality of medical services, which will promote social improvement and improve the level of medical care services. However, in the process of modern social change, there are shortages of medical service resources and unequal distribution. The traditional face-to-face diagnosis and treatment model between doctors and patients can no longer meet the needs of social development. In order to break through the limitations of time and space, and then allocate and manage medical service resources more reasonably, improve the level of diagnosis and treatment, reduce medical time and cost, and better provide services for the public to enjoy medical care anytime, anywhere, mobile Medical technology has gradually received widespread attention in modern society. The development of mobile medical technology has led to the emergence of implantable medical devices. Implantable medical devices can not only allow medical workers to measure and obtain physiological information of living bodies in real time, provide information assistance for disease prevention, diagnosis and treatment, but also provide patients with more comfortable treatment services. In order to obtain physiological information collected by implanted medical devices in vivo or send therapeutic signals to implanted medical devices in vitro, reliable wireless communication between two different devices inside and outside the body is required. As a key device for wireless communication between implantable medical devices and external devices, antennas affect the transmission of biomedical signals. Implantable antennas with excellent performance will improve the safety and reliability of the entire mobile medical system.

The use of antennas as wireless communication devices is an effective solution to achieve reliable communication between implanted medical devices and in vitro devices. However, the design of implanted antennas is different from the antenna devices we traditionally use. Since the antenna needs to be implanted into the human body, different biological tissues in the body not only have different shapes, but also have different electromagnetic properties, which will change with changes in frequency, temperature and water content. The position and orientation of the antenna will also change with the movement of the human body. Together, these characteristics constitute a complex working environment for implantable antennas. In addition to considering the influence of the human body on antenna performance, factors such as biocompatibility, miniaturization, low power consumption, and safety must also be considered when designing implantable antennas. These constraints also make the design of implantable antennas more difficult.

Utility model content

In order to overcome the deficiencies in the prior art, the utility model provides a broadband implanted human body antenna applied to mobile medical care.

The utility model adopts the following technical solutions:

A broadband implantable human body antenna applied to mobile medical treatment, including an antenna structure, a coaxial feed structure and a biocompatible coating structure, the antenna structure is composed of a radiating metal patch, a metal floor patch, a dielectric substrate and a short-circuit probe The radiating metal patch and the metal floor patch are respectively located on the upper and lower surfaces of the dielectric substrate, and the short-circuit probe is used to connect the radiating metal patch and the metal floor.

The antenna structure is a square structure with four corners being arc-shaped.

The radiating metal patch adopts a microstrip line structure, and the microstrip line structure is a planar square structure formed by bending the microstrip line.

The short-circuit probe is a cylindrical structure with a radius of 0.5 mm.

The coaxial feed structure is composed of a coaxial cable with a characteristic impedance of 50Ω. The radius of the inner core of the coaxial cable is 0.4mm. The inner core of the coaxial cable is connected to the radiation metal patch, and the outer surface of the coaxial cable is connected to the metal Floor patch connections.

The side length of the planar square structure is 9.42 mm.

The square structure has a side length of 9.5 mm and a thickness of 0.635 mm.

The biocompatible coating structure is composed of a film layer covering the entire antenna, with a thickness of 0.02 mm.

The beneficial effects of the utility model:

(1) The antenna extends the effective radiation current path by bending the microstrip line and reduces the resonant frequency of the antenna, thereby reducing the size of the antenna. Compared with the ordinary microstrip antenna, the antenna is smaller in size and more conducive to implantation type medical equipment;

(2) On the basis of the microstrip antenna, the antenna expands the bandwidth of the antenna by loading a short-circuit probe to increase the resonance point, so as to ensure that the antenna can still work within the frequency band when the internal environment (such as the dielectric constant) changes, So that the antenna has better robustness;

(3) The entire antenna is coated with biocompatible materials to avoid rejection by the human body and protect the safety of the human body. At the same time, the insulating properties of the coating isolate the radiation patch from contacting the biological tissue with conductive properties, preventing the resulting short circuit effect;

(4) The designed broadband implantable antenna has the characteristics of miniaturization, low profile, broadband, high robustness and biocompatibility.

(5) The designed antenna has good directivity, and has the strongest radiation intensity toward the outside of the body. At the same time, the backlobe gain is low, which reduces the damage of backlobe radiation to the human body:

(6) The four arc-shaped corners of the designed square structure avoid damage to internal tissues of the human body by sharp objects.

Description of drawings

Fig. 1 is the top view of the utility model;

Fig. 2 is a side view of the utility model;

Fig. 3 is the simulation figure of the reflection coefficient of the utility model on the three-layer human tissue model;

Fig. 4(a) is the connection curve of the gain of the implanted antenna implanted in the human body in the horizontal direction at 360° at different angles, and each dotted circle in the figure corresponds to the gain of the corresponding scale on the left;

Fig. 4(b) is a connection curve of gain and magnitude at different angles of 360° when the implantable antenna is implanted in the human body in the vertical direction.

detailed description

The utility model will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example

As shown in Figures 1 and 2, a broadband implantable human body antenna applied to mobile medical treatment includes an antenna structure, a coaxial feed structure and a biocompatible coating structure. The antenna structure is composed of a radiating metal patch 1, a metal It consists of a floor patch, a dielectric substrate and a short-circuit probe. The radiation metal patch 1 and the metal floor patch 2 are respectively located on the upper and lower surfaces of the dielectric substrate 3. The short-circuit metal probe 4 is connected to the radiation patch 1 and the metal floor patch. Floor patch 2.

The antenna structure is specifically a square structure with a side length g of 9.5 mm and a thickness h of 0.635 mm. In order to prevent the edges and corners of the square structure from damaging the tissue around the antenna, the four corners of the square structure are designed as arcs.

The radiating metal patch adopts a microstrip line structure, specifically: a planar square structure formed by bending a microstrip line, with a side length l of 9.42 mm, and the short-circuit probe is a cylindrical structure with a radius of 0.5 mm. Radiant metal patches and metal floor patches.

In this embodiment, the structure of the entire microstrip line is obtained by transforming and connecting four "Wang" characters. The connection part is a horizontal line in the middle of the "Wang" character, and the vertical lines of the upper and lower Wang characters on the right side of the four "Wang" characters Connection, the upper and lower characters on the left side are not connected, forming the whole structure of the microstrip line. The bending angle of the square structure is 90 degrees, and the circular chamfering radius of the four corners of the patch is 1mm. The relevant data of the bending structure of the microstrip line are shown in Table 1 below:

Table 1 Microstrip line structure parameters (unit: mm)

The dielectric substrate is Rogers 3210, a high-frequency plate with a high dielectric constant, with a relative dielectric constant of 10.2 and a loss tangent of 0.003.

The coaxial feed structure 5 is composed of a coaxial cable with a characteristic impedance of 50Ω, the radius of the inner core of the coaxial cable is 0.4mm, and the inner core of the coaxial cable is connected to the radiating metal patch through a metal via hole , the metal outer surface is connected to the metal floor tiles.

The biocompatible coating structure is composed of a film layer wrapped around the entire antenna. The coating material adopts aluminum oxide (alumina) material, its relative dielectric constant is 9.2, loss tangent value is 0.008, not only has biocompatibility, but also has insulation, and the film thickness is 0.02mm.

As shown in Figure 3, Figure 4(a) and Figure 4(b), a broadband implantable human body antenna applied to mobile medicine works in the medical implantable communication service frequency band (MICS: 402MHz~405MHz), and the antenna is also It has a wide impedance bandwidth. At the same time, the designed antenna has good directivity, and has the strongest radiation intensity toward the outside of the body, and the backlobe gain is low, which reduces the damage of the backlobe radiation to the human body.

The broadband implanted human body antenna designed by the utility model has the characteristics of miniaturization, low profile, broadband, high robustness, biocompatibility and the like.

The above-mentioned embodiment is a preferred implementation mode of the present utility model, but the implementation mode of the present utility model is not limited by the described embodiment, and any other changes, modifications, modifications, Substitution, combination, and simplification should all be equivalent replacement methods, and are all included in the protection scope of the present utility model.

Claims (9)

1. a kind of wideband implanted human body antenna for being applied to portable medical, it is characterised in that including antenna structure, coaxial feed Structure and bio-compatible coating structure, the antenna structure is by radiation metal patch, metal floor paster, medium substrate and short circuit Probe is constituted, and, respectively positioned at the upper and lower surface of medium substrate, the short circuit is visited for the radiation metal patch and metal floor paster Pin is used to connect radiation metal patch and metal floor.

2. wideband implanted human body antenna according to claim 1, it is characterised in that the antenna structure is arc for corner The square structure of shape.

3. wideband implanted human body antenna according to claim 1, it is characterised in that the radiation metal patch is using micro- Strip line structure, the microstrip line construction is the plane square structure that microstrip line bending is constituted.

4. wideband implanted human body antenna according to claim 1, it is characterised in that the grounding probe is tied for cylinder Structure, radius is 0.5mm.

5. wideband implanted human body antenna according to claim 1, it is characterised in that the coaxial feed is by feature Impedance is that the coaxial cable of 50 Ω is constituted, and the coaxial cable inner core radius is 0.4mm, coaxial cable inner core and radiation metal patch Piece is connected, and coaxial cable outer surface is connected with metal floor paster.

6. wideband implanted human body antenna according to claim 3, it is characterised in that the side of the plane square structure A length of 9.42mm.

7. wideband implanted human body antenna according to claim 2, it is characterised in that the length of side of the square structure is 9.5mm, thickness is 0.635mm.

8. wideband implanted human body antenna according to claim 1, it is characterised in that the bio-compatible coating structure by The film layer for wrapping up whole antenna is constituted, and thickness is 0.02mm.

9. wideband implanted human body antenna according to claim 3, it is characterised in that the microstrip line construction is by four kings The deformation of shaped offset of microstrip line is obtained, and two adjacent centres of king's word one are horizontal to be connected.