Contrast agent extravasation alarm device for enhancing CT (Computed Tomography) examination

Abstract

The utility model discloses a contrast agent extravasation alarm device for enhanced CT (Computed Tomography) examination, which comprises a flexible belt body, an outer peripheral surface, an inner peripheral surface and a lateral contour edge positioned on the common edge of the outer peripheral surface and the inner peripheral surface, the injection window penetrates through the outer circumferential surface and the inner circumferential surface of the flexible belt body and extends in the annular circumferential direction of the flexible belt body; the inflatable bag is arranged in the flexible belt body and comprises an outer ring and an inner ring communicated with the outer ring through a connecting channel, the outer ring is arranged along the side contour edge, and the inner ring is arranged along the contour of the injection window; a pressure sensor; an acousto-optic unit; and a wet dressing layer. The skin around an injection part is slightly pressed through the inflatable bag, the influence of muscle vibration on the needle head can be reduced, the flexible belt body and the inflatable bag can effectively face irregular muscle part contours so as to be better attached to the skin, the injection part is effectively stabilized, and the possibility that the needle head moves is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an alarm device for contrast agent extravasation during enhanced CT examination. Background Technology

[0002] Enhanced CT scans are imaging techniques that use intravenous injection of iodine contrast agents to improve the contrast between diseased and normal tissues. Contrast agent extravasation is a common complication in medical imaging examinations (such as CT, MRI, and angiography), referring to the leakage of contrast agent through the blood vessel wall into surrounding tissues. Once extravasation is detected, it should be treated promptly to effectively alleviate patient discomfort and prevent long-term complications.

[0003] If contrast agent extravasation occurs during enhanced CT scans, medical staff may not be able to detect it in time because current technology lacks effective alarm mechanisms to indicate extravasation. This is because, in cases of minor extravasation, elderly patients, cancer patients undergoing long-term chemotherapy, infants, and patients with potential vascular lesions are often less sensitive to pressure and feedback. Furthermore, medical staff may not be constantly with the patient to effectively monitor for extravasation. Even with constant monitoring, there are lacking direct emergency treatment methods to manage extravasation. Utility Model Content

[0004] The purpose of this invention is to provide an enhanced contrast agent extravasation alarm device for CT examinations, in order to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] First, this utility model provides a contrast agent extravasation alarm device for enhanced CT examination, characterized in that it includes:

[0007] The flexible belt is annular and has an outer peripheral surface, an inner peripheral surface, and a lateral profile edge at the common edge of the outer peripheral surface and the inner peripheral surface.

[0008] An injection window is provided through the outer and inner peripheral surfaces of the flexible strip and extends along the circumferential direction of the flexible strip;

[0009] An inflatable bladder, disposed within the flexible band, includes an outer ring and an inner ring connected to the outer ring via a connecting channel. The outer ring is arranged along the side profile edge, and the inner ring is arranged along the profile of the injection window.

[0010] A pressure sensor is disposed on the inner circumferential surface and corresponds to the position of the inner ring.

[0011] An acousto-optic unit is disposed on the outer peripheral surface of the flexible belt and is electrically connected to the pressure sensor;

[0012] A wet dressing layer is disposed on the inner circumferential surface of the flexible band and located in the area between the inner and outer rings. The wet dressing layer is available for injection of external wet dressing material.

[0013] In use, first put the flexible band on the corresponding position according to the injection site, and make sure that the injection window is aligned with the injection site to avoid injection of contrast agent. Then, inflate the air bladder so that the air bladder presses lightly against the skin, so that the pressure sensor can detect the signal data. Once ready, the contrast agent can be injected.

[0014] Compared to traditional methods, the flexible band provided by this invention is worn at the contrast agent injection site and aligned with the injection site using the injection window, without affecting the use of the contrast agent. By gently pressing the skin around the injection site with an inflatable bladder, the influence of muscle tremors on the needle can be reduced. The inflatable bladder is designed with an outer ring and an inner ring, that is, with an inner ring and an outer ring extending outward from the injection site. The flexible band and the inflatable bladder can effectively accommodate irregular muscle contours to fit the skin more closely, effectively stabilizing the injection site and reducing the possibility of needle movement.

[0015] Simultaneously, by utilizing the gentle pressure of the inflatable bladder, the pressure sensor corresponding to the inner ring of the inflatable bladder is more closely attached to the skin, ensuring the sensitivity and accuracy of the pressure sensor. By acquiring pressure sensing information near the injection site, it is possible to promptly detect pressure changes caused by skin swelling due to contrast agent extravasation. Then, through the function of the audio-visual unit, an alarm is triggered in a timely manner to alert medical staff to the abnormal situation and handle it promptly.

[0016] In the event of contrast agent extravasation, this invention also provides a basis for emergency treatment through a wet dressing layer. By injecting appropriate wet dressing materials (such as ice water, 50% magnesium sulfate solution, dexamethasone + lidocaine mixture, cold saline, etc.) into the wet dressing layer, wet dressing can be applied promptly and directly to implement the emergency treatment plan, thereby improving emergency prevention capabilities.

[0017] As an extension of the above solution, the flexible band also has a first elastic deformation layer and a second elastic deformation layer, the first elastic deformation layer being located between the wet dressing layer and the side contour edge, and the second elastic deformation layer being located between the wet dressing layer and the contour of the injection window.

[0018] In this extended design, the elastic deformation layer provides deformation capability when the airbag is inflated, creating a deformation space between the outer ring and the side contour edge. This allows the inner circumferential surface of the airbag to expand towards the skin during inflation, making it easier to adhere to the skin. Similarly, the inner ring and the contour of the injection window are also affected. Furthermore, since the wet dressing layer is located between the first and second elastic deformation layers, the entire wet dressing layer area moves towards the skin, resulting in a better adhesion effect.

[0019] As an extension of the above solution, the connecting channel and a portion of the inner ring channel form a common channel, and the two ends of the common channel extend toward the outer ring and connect to the outer ring.

[0020] In this extended design, the inner and outer rings are connected, which makes the inner circumferential surface, relative to the position of the air bladder, the wet dressing layer, and the pressure sensor, have a relatively consistent pressure performance. It can also adapt to the irregular surfaces of different muscle parts of different people. At the same time, by constructing a common channel with part of the inner ring, the flow path of gas during inflation can be reduced, making inflation more efficient.

[0021] As an extension of the above solution, the flexible strip is provided with an injection port, which is connected to the wet dressing layer through a branch pipe. The branch pipe is arranged in the flexible strip and at least two connection ends between the branch pipe and the wet dressing layer are provided.

[0022] In this extended solution, the injection port provides faster and more convenient emergency prevention. The branched pipes allow the wet dressing injected from the injection port to quickly diffuse into the wet dressing layer. Compared to a single connection end, where the wet dressing diffuses slowly from a single connection end to the entire wet dressing layer with very low efficiency, this extended solution, with two or more connection ends distributed at relatively distant locations within the wet dressing layer, effectively improves the penetration efficiency of the wet dressing within the wet dressing layer. This allows the wet dressing to be applied to the wet dressing emergency plan in the shortest possible time, effectively improving the emergency prevention effect.

[0023] As an extension of the above solution, the audio-visual unit includes an LED strip or flashing LED beads, which are arranged around the injection window and electrically connected to the pressure sensor so that the control circuit drives the flashing LED beads to flash or drives the LED strip to emit light when an abnormal signal from the pressure sensor is received.

[0024] In this extended solution, when the pressure information from the pressure sensor exceeds a set threshold, an abnormal signal is emitted, and the control circuit drives the LED strip or flashing LED beads to emit light or flash, serving as an alarm.

[0025] As an extension of the above solution, the acoustic-optical unit also includes a buzzer located on the outer peripheral surface of the flexible strip and away from the injection window, and electrically connected to the pressure sensor so that it is driven by the control circuit to generate intermittent and / or continuous sounds when a signal from the pressure sensor is received.

[0026] In this extended solution, the buzzer has the function of generating intermittent and continuous sounds. The two different sound representations are used to meet the situation of light pressure on the skin before wearing the flexible band and the situation of swelling caused by contrast agent extravasation during use. This allows medical staff or patients to receive alarm prompts more accurately during use, improving the convenience of wearing and the alarm effect of use.

[0027] As an extension of the above solution, the flexible strip also has a control button, which is electrically connected to the control circuit so that the control circuit can control the audio-visual unit to stop operating when instructed by the control button. The control button is externally attached to the flexible strip through a signal line and / or a wire, and the signal line and / or wire passes into the flexible strip and connects to the control circuit.

[0028] In this extended solution, the control button is attached to the flexible strip. In addition to improving the convenience of operation, it also ensures that the operation of the button does not affect the flexible strip and the injection site. This avoids applying force to the flexible strip when operating the button, which could cause vibration to the injection site and surrounding muscle tissue or displacement of the needle, thus preventing adverse effects.

[0029] As an extension of the above solution, the outer surface of the flexible band is provided with a U-shaped locking position for fixing the needle tube, and the U-shaped locking positions are evenly distributed around the injection window.

[0030] In this extended solution, the needle is fixed by a U-shaped clamp, which can effectively stabilize the puncture site and reduce needle displacement.

[0031] As an extension of the above solution, the outer peripheral surface of the flexible belt is provided with a hook and loop fastener. The hook and loop fastener includes a fine and soft fiber patch and a stiffer hook patch. The fiber patch is sewn onto the outer peripheral surface and arranged around the injection window. One end of the hook patch is fixedly connected to one end of the fiber patch, and the other end can be freely hooked onto the hook patch.

[0032] In this extended solution, the needle is secured with hook and loop fasteners, which effectively stabilizes the puncture site and reduces needle displacement. Attached Figure Description

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0034] Figure 1 This is a schematic diagram of the structure of the flexible strip in the embodiment;

[0035] Figure 2 This is a schematic diagram of an inflatable bladder structure with a deployable flexible band;

[0036] Figure 3 This is a schematic diagram of the area covered by the wet dressing layer of the unfolded flexible strip;

[0037] Figure 4 It is a flexible band in Figure 3 A schematic diagram of the cross-sectional structure in the AA direction;

[0038] Figure 5 This is a schematic diagram of a flexible belt with hook and loop fasteners provided in an embodiment.

[0039] The markings in the attached diagram indicate:

[0040] 100: Flexible belt body; 200: Injection window; 300: Inflatable bladder; 310: Outer ring of inflatable bladder; 320: Inner ring of inflatable bladder; 330: Connecting channel; 340: Inflation port; 350: Deflator port; 400: Pressure sensor; 500: Acoustic and optical unit; 600: Wet dressing layer; 610: Injection port; 700: Elastic deformation layer; 800: U-shaped snap fastener; 900: Hook and loop fastener. Detailed Implementation

[0041] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0042] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] In the description of this utility model, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0044] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0045] Reference Figures 1 to 5 The following are several embodiments of the contrast agent extravasation alarm device for enhanced CT examination according to this utility model.

[0046] In some embodiments, a contrast agent extravasation alarm device for enhanced CT examination includes:

[0047] The flexible belt 100 is annular and has an outer peripheral surface, an inner peripheral surface, and a lateral profile edge located at the common edge of the outer peripheral surface and the inner peripheral surface.

[0048] An injection window 200 is provided through the outer and inner peripheral surfaces of the flexible strip 100 and extends along the circumferential direction of the flexible strip 100.

[0049] An inflatable bladder 300 is disposed within the flexible band 100 and includes an outer ring 310 and an inner ring 320 connected to the outer ring 310 via a connecting channel 330. The outer ring 310 is arranged along the side profile edge, and the inner ring 320 is arranged along the profile of the injection window 200.

[0050] A pressure sensor 400 is disposed on the inner circumferential surface and at a position corresponding to the inner ring 320;

[0051] An acousto-optic unit 500 is disposed on the outer peripheral surface of the flexible belt and is electrically connected to the pressure sensor 400;

[0052] A wet dressing layer 600 is disposed on the inner circumferential surface of the flexible band and located in the area between the inner ring 320 and the outer ring 310. The wet dressing layer 600 is available for injection of external wet dressing material.

[0053] When in use, the flexible band is worn on the relevant intravenous injection sites such as the upper limbs, hands, and lower limbs. The specific site depends on the actual needs of use. The flexible band can better adapt to the contours of different sites. It can be in the form of a cuff or other elastic closed ring. After wearing, align the injection window with the site to be injected. The setting of the injection window exposes the injection site and does not affect the injection of contrast agent.

[0054] Further, refer to Figure 2 and Figure 4The flexible band contains an inflatable bladder 300, which is arranged in the form of an outer ring 310 and an inner ring 320. That is, the outer ring has two rings. If the injection is performed in the cephalic vein or basilic vein of the forearm, the inner ring first surrounds the injection site (cephalic vein or basilic vein of the forearm), and the two outer rings are located in front of and behind the inner ring, respectively. The inflatable bladder gently presses the skin around the injection site, which can reduce the influence of muscle tremors on the needle.

[0055] Furthermore, since the inflatable bladder of the inner ring 320 surrounds the injection site, the pressure sensor 400 can accurately monitor the swelling changes of the surrounding muscle tissue at the injection site. When contrast agent extravasation causes skin swelling, the pressure change signal can be acquired in a timely manner. In this embodiment, the number of pressure sensors can be one or more. If two or more pressure sensors are used, they are evenly distributed on the inner peripheral surface of the flexible band of the inner ring 320, directly applied to the skin to accurately acquire pressure signals, i.e., symmetrically or in an array distributed around the injection site. Figure 3 The pressure sensors 400 shown are symmetrically arranged on both sides of the injection window 200. Similarly, one or more acoustic-optical units 500 can be arranged symmetrically or in an array around the injection site. When the pressure sensor detects an abnormal pressure signal, the control circuit drives the acoustic-optical units to emit light to alert medical personnel and / or the patient.

[0056] Further, refer to Figure 3 and Figure 4 A wet dressing layer 600 is provided on the inner circumferential surface of the flexible belt 100 in the region between the inner and outer rings, such as... Figure 3 As shown, the shaded area represents the coverage area of ​​the wet dressing layer 600. The wet dressing layer provides the basis for emergency treatment. By injecting appropriate wet dressing materials (such as ice water, 50% magnesium sulfate solution, dexamethasone + lidocaine mixture, cold saline, etc.) into the wet dressing layer, wet dressings can be applied promptly and directly to implement emergency treatment plans, thereby improving emergency prevention capabilities.

[0057] Compared to traditional methods, the flexible band provided by this invention is worn at the contrast agent injection site and aligned with the injection site using the injection window, without affecting the use of the contrast agent. By gently pressing the skin around the injection site with an inflatable bladder, the influence of muscle tremors on the needle can be reduced. The inflatable bladder is designed with an outer and an inner ring, that is, an inner ring and an outer ring extending outward from the injection site. The flexible band and the inflatable bladder can effectively accommodate irregular muscle contours to fit the skin more closely, effectively stabilizing the injection site and reducing the possibility of needle movement.

[0058] It should be noted that the purpose of this invention is to use an inflatable bladder to apply light pressure to the skin in order to stabilize the skin around the injection site, reduce the impact of muscle tremors on the needle, and ensure that the pressure sensor is in contact with the skin to obtain accurate pressure monitoring. It is not intended to use excessive inflation pressure to compress the skin and affect the injection of contrast agent.

[0059] Those skilled in the art will understand that the pressure sensor is placed against the skin by gently pressing the inflatable balloon. The pressure is achieved by whether the pressure sensor can detect a data signal or obtain a low pressure value. This embodiment does not impose any restrictions on the standard of gentle pressure; technicians can set it according to actual usage needs. For example, if the pressure sensor fails to return data after the flexible band is worn and inflated, it indicates that the inner ring is not effectively pressing against the skin. Similarly, if the pressure sensor can obtain a pressure signal after the flexible band is worn and inflated, but the pressure value does not reach the preset low pressure threshold, it also indicates that the inner ring is not effectively pressing against the skin. Therefore, the specific standard for the inflatable balloon to gently press against the skin around the injection site should be set according to the actual situation, and this embodiment does not impose any restrictions.

[0060] This embodiment utilizes an inflatable bladder to ensure that the pressure sensor at the corresponding inner ring position fits more closely to the skin, guaranteeing the sensitivity and accuracy of the pressure sensor. By acquiring pressure sensing information near the injection site, it can promptly detect pressure changes caused by skin swelling due to contrast agent extravasation. Then, through the action of the audio-visual unit, an alarm is triggered in a timely manner to alert medical staff to the abnormal situation and handle it promptly.

[0061] In an optional embodiment, refer to Figure 3 and Figure 4 The flexible band 100 further comprises a first elastic deformation layer 710 and a second elastic deformation layer 720, wherein the first elastic deformation layer 710 is located between the wet dressing layer 600 and the side contour edge, and the second elastic deformation layer 720 is located between the wet dressing layer 600 and the contour of the injection window 200.

[0062] In this embodiment, the elastic deformation layer provides deformation capability when the airbag is inflated, creating a deformation space between the outer ring and the side contour edge. This allows the inner circumferential surface of the airbag to expand towards the skin during inflation, making it easier to adhere to the skin. Similarly, the inner ring and the contour of the injection window also benefit from this. Furthermore, because the wet dressing layer is located between the first and second elastic deformation layers, the entire wet dressing layer area moves towards the skin, resulting in a better adhesion effect.

[0063] Furthermore, the wet dressing layer comprises a material made of at least one of the following: sterile gauze, hydrocolloid dressing, silicone dressing, or nonwoven pad.

[0064] In an optional embodiment, refer to Figure 2 The connecting channel 330 and a portion of the channel in the inner ring 320 form a common channel, and both ends of this common channel extend towards and connect to the outer ring 310. The inner and outer rings are connected, resulting in a relatively consistent pressure response on the inner circumferential surfaces relative to the positions of the air bladder, wet dressing layer, and pressure sensor. This allows for adaptation to the irregular surfaces of different muscle groups in different individuals. Furthermore, the common channel formed by a portion of the inner ring reduces the gas flow path during inflation, making inflation more efficient.

[0065] Furthermore, such as Figure 1 and Figure 2 As shown, the flexible belt 100 has an inflation port 340 and an deflation port 350 on its side contour edge or outer peripheral surface. The inflation port 340 and the deflation port 350 are equipped with one-way valves and are respectively connected to the connecting channel 330. The inflation port is connected to the connecting channel, and the air entering through the connecting channel can disperse the inflation gas to each inflation bag more quickly, which can complete the inflation process more quickly and have a better inflation effect. It can also reduce the abrupt feeling of local pressure caused by localized inflation and expansion.

[0066] This embodiment does not impose any restrictions on the inflation method of the airbag. The airbag can be inflated by a manual inflation ball or an electric air pump. As long as the air inlet is connected to the corresponding air pumping device, the airbag can be inflated by starting the air pumping device.

[0067] In an optional embodiment, refer to Figure 1 The flexible band 100 is provided with an injection port 610, which is connected to the wet dressing layer 600 through a branch pipe. The branch pipe is located inside the flexible band 100 and at least two connection ends between the branch pipe and the wet dressing layer are provided.

[0068] In this embodiment, the injection port provides faster and more convenient emergency prevention, while the branch pipes allow the wet dressing injected from the injection port to quickly diffuse / penetrate into the wet dressing layer. If two or more connection points are provided, they are distributed at relatively distant locations within the wet dressing layer, effectively improving the penetration efficiency of the wet dressing and ensuring its application to the wet dressing emergency plan in the shortest possible time, thus significantly enhancing the emergency prevention effect.

[0069] In an optional embodiment, such as Figure 1 As shown, the audio-visual unit 500 includes an LED light strip or flashing LED beads, which are arranged around the injection window and electrically connected to the pressure sensor so that when an abnormal signal is received from the pressure sensor, the control circuit drives the flashing LED beads to flash or drives the LED light strip to emit light.

[0070] When the pressure sensor reading exceeds the set threshold, it sends an abnormal signal. The control circuit then drives the LED strip or flashing LED beads to light up or flash, serving as an alarm.

[0071] Those skilled in the art will understand that the means and operating principles for transmitting the electrical signal from the pressure sensor and the command signal from the control button to the control circuit, and for the control circuit to drive the sound and light unit and / or buzzer to start according to the electrical signal or command signal, can be achieved by existing technology. This utility model does not impose any restrictions on the structure of the control circuit, the signal processing and driving method, or the communication implementation means with the pressure sensor and control button. As long as the control circuit can drive the sound and light unit and buzzer to start and / or stop after receiving the signal from the pressure sensor and / or the command signal from the control button, it is sufficient to use existing technology. No further details will be provided here.

[0072] In an optional embodiment, the acoustic-optical unit further includes a buzzer (not shown) located on the outer peripheral surface of the flexible strip and disposed away from the injection window, and electrically connected to the pressure sensor so that it is driven by the control circuit to generate intermittent and / or continuous sounds when a signal from the pressure sensor is received.

[0073] In this implementation, the buzzer has the function of generating intermittent and continuous sounds. The two different sound representations are used to meet the situation of light pressure on the skin before wearing the flexible band and the situation of swelling caused by contrast agent extravasation during use. This allows medical staff or patients to receive alarm prompts more accurately during use, improving the convenience of wearing and the alarm effect of use.

[0074] Specifically, when the flexible inflatable bag is worn and inflated, the pressure sensor, upon contact with the skin and generating a pressure signal, transmits this signal to the control circuit. The control circuit, receiving this signal, activates a buzzer with intermittent audible sounds, indicating that the inflatable bag can gently press against the skin and that the pressure sensor has acquired pressure information at the injection site, allowing inflation to stop. During contrast agent injection, if extravasation occurs causing swelling at the injection site, the pressure signal from the pressure sensor changes and is transmitted to the control circuit. The control circuit receives this signal and determines if it exceeds a set threshold. If so, it activates a buzzer with continuous audible sounds to alert medical staff and / or the patient.

[0075] In an optional embodiment, the flexible band also has a control button (not shown in the figure). The control button is electrically connected to the control circuit so that, when instructed by the control button, the control circuit controls the audio-visual unit to stop operating. The control button is externally mounted on the flexible band via a signal line and / or wire, and the signal line and / or wire enters the flexible band and connects to the control circuit. The external mounting of the control button on the flexible band not only improves operational convenience but also prevents the operation of the button from affecting the flexible band and the injection site. This avoids applying force to the flexible band when operating the button, which could cause vibration to the injection site and surrounding muscle tissue or displacement of the needle, resulting in adverse effects.

[0076] In an optional embodiment, refer to Figure 1 The outer surface of the flexible band 100 is provided with U-shaped retaining positions 800 for fixing the needle tube, and the U-shaped retaining positions are evenly distributed around the injection window. Fixing the needle tube / suture tube with U-shaped retaining positions can effectively stabilize the puncture site and reduce the possibility of needle displacement.

[0077] In an optional embodiment, the outer peripheral surface of the flexible band 100 is provided with a hook-and-loop fastener 900. The hook-and-loop fastener includes a fine, soft fiber patch and a stiffer, hook-and-loop fastener. The fiber patch is sewn onto the outer peripheral surface and surrounds the injection window. One end of the hook-and-loop fastener is fixedly connected to one end of the fiber patch, and the other end can be freely hooked onto the fiber patch. In this embodiment, one end of the hook-and-loop fastener is first lifted, then the needle / suture is placed on the fiber patch, and then the hook-and-loop fastener is attached to the fiber patch, thus securing the needle / suture. Using the hook-and-loop fastener to secure the needle effectively stabilizes the puncture site and reduces the possibility of needle displacement.

[0078] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A contrast agent extravasation alarm device for enhanced CT examination, characterized in that, include: The flexible strip (100) is annular and has an outer peripheral surface, an inner peripheral surface, and a lateral profile edge at the common edge of the outer peripheral surface and the inner peripheral surface. An injection window (200) is provided through the outer and inner peripheral surfaces of the flexible strip (100) and extends along the circumferential direction of the flexible strip (100). An inflatable bladder (300) is disposed within the flexible band (100) and includes an outer ring (310) and an inner ring (320) connected to the outer ring (310) via a connecting channel (330). The outer ring (310) is arranged along the side profile edge, and the inner ring (320) is arranged along the profile of the injection window (200). A pressure sensor (400) is disposed on the inner circumferential surface and at a position corresponding to the inner ring (320); An acousto-optic unit (500) is disposed on the outer peripheral surface of the flexible belt and is electrically connected to the pressure sensor (400); A wet dressing layer (600) is disposed on the inner circumferential surface of the flexible band and located in the area between the inner ring (320) and the outer ring (310). The wet dressing layer (600) is available for injection of external wet dressings.

2. The contrast agent extravasation alarm device for enhanced CT examination according to claim 1, characterized in that, The flexible band also has a first elastic deformation layer (710) and a second elastic deformation layer (720), the first elastic deformation layer (710) being located between the wet dressing layer (600) and the side contour edge, and the second elastic deformation layer (720) being located between the wet dressing layer (600) and the contour of the injection window (200).

3. The contrast agent extravasation alarm device for enhanced CT examination according to claim 1, characterized in that: The connecting channel (330) and a portion of the inner ring (320) form a common channel, and the two ends of the common channel extend toward the outer ring (310) and connect to the outer ring (310).

4. The contrast agent extravasation alarm device for enhanced CT examination according to claim 1, characterized in that: The flexible band (100) is provided with an injection port (610), which is connected to the wet dressing layer (600) through a branch pipe. The branch pipe is arranged inside the flexible band (100) and at least two connection ends between the branch pipe and the wet dressing layer (600) are provided.

5. The contrast agent extravasation alarm device for enhanced CT examination according to claim 1, characterized in that: The audio-visual unit (500) includes an LED strip or flashing LED beads, which are arranged around the injection window (200) and electrically connected to the pressure sensor (400) so that the flashing LED beads are driven to flash or the LED strip is driven to emit light by the control circuit when an abnormal signal is received from the pressure sensor.

6. The contrast agent extravasation alarm device for enhanced CT examination according to claim 5, characterized in that: The acoustic-optical unit (500) also includes a buzzer located on the outer peripheral surface of the flexible strip (100) and away from the injection window (200), and electrically connected to the pressure sensor (400) so that it is driven by the control circuit to generate intermittent and / or continuous sounds when a signal from the pressure sensor is received.

7. The contrast agent extravasation alarm device for enhanced CT examination according to claim 6, characterized in that: The flexible strip (100) also has a control button, which is electrically connected to the control circuit so that the control circuit can control the audio-visual unit (500) to stop operating when instructed by the control button.

8. The contrast agent extravasation alarm device for enhanced CT examination according to claim 7, characterized in that: The control buttons are externally attached to the flexible strip via signal lines and / or wires, and the signal lines and / or wires pass through the flexible strip to connect to the control circuit.

9. The contrast agent extravasation alarm device for enhanced CT examination according to claim 1, characterized in that: The outer peripheral surface of the flexible band (100) is provided with a U-shaped locking position (800) for fixing the needle tube, and the U-shaped locking position (800) is evenly distributed around the injection window (200).

10. The contrast agent extravasation alarm device for enhanced CT examination according to claim 1, characterized in that: The outer peripheral surface of the flexible band (100) is provided with hook and loop fastener (900), which includes a fine and soft fiber patch and a stiffer hook patch. The fiber patch is sewn onto the outer peripheral surface and arranged around the injection window (200). One end of the hook patch is fixedly connected to one end of the fiber patch, and the other end can be freely hooked onto the hook patch.

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