Medical device for distracting a target site

Abstract

A medical device (100) for distracting a target site, comprising: a first side portion (112); a second side portion (116); and an intermediate portion (114) connecting the first side portion (112) and the second side portion (116), and disposed between the first side portion (112) and the second side portion (116); wherein the medical device (100) has a distraction mechanism that causes the first side portion (112) and the second side portion (116) to assume a first distracted state in a first condition, and causes the intermediate portion (114) to assume a second distracted state in a second condition; wherein the intermediate portion (114) does not assume the second distracted state in the first condition.

Description

TECHNICAL FIELD

[0001] The present application relates to a medical device for expanding a target site, and in particular to a medical device for expanding a target site, which is expanded by its side first during the expansion. BACKGROUND

[0002] Currently, the medical devices for expanding a target site, such as medical stents for expanding a blood vessel, are mostly shuttle-shaped. Such a structure has low fixation and is easy to slide during the installation or expansion process, which makes it difficult for the operator to fix the medical device to the target position. Therefore, there is a need for a medical device for expanding a target site, which can improve fixation and avoid sliding during the installation process. SUMMARY

[0003] To solve the above problems, the present application provides a medical device for expanding a target site, which can improve fixation and avoid sliding during the installation process.

[0004] Based on the above idea, the present application provides a medical device for expanding a target site, comprising: a first side; a second side; and an intermediate part connecting the first side and the second side, and arranged between the first side and the second side; wherein the medical device has an expansion mechanism, which makes the first side and the second side in a first expansion state under a first condition, and makes the intermediate part in a second expansion state under a second condition; wherein the intermediate part does not have the second expansion state under the first condition.

[0005] In a preferred embodiment of the present application, the medical device is first in the first condition and then in the second condition during the expansion process.

[0006] In a preferred embodiment of the present application, the target site is a blood vessel, and the medical device is a blood vessel expansion device.

[0007] In a preferred embodiment of the present application, the medical device has a stent body, which comprises the first side, the second side and the intermediate part.

[0008] In a preferred embodiment of the present application, the expansion mechanism is that the first side is composed of a first memory metal, the second side is composed of a second memory metal, and the intermediate part is composed of a third memory metal; wherein the first memory metal and the second memory metal make the first side and the second side in the first expansion state under the first condition, and the third memory metal makes the intermediate part in the second expansion state under the second condition; wherein the third memory metal does not make the intermediate part in the second expansion state under the first condition.

[0009] In a preferred embodiment of the present application, the first condition is that the stent body reaches a first temperature, and the second condition is that the stent body reaches a second temperature; wherein the first temperature is lower than the second temperature.

[0010] In a preferred embodiment of the present application, the medical device has a balloon body, the balloon body comprising the first side portion, the second side portion, and the intermediate portion.

[0011] In a preferred embodiment of the present application, the expansion mechanism is that the first side portion has a first density, the second side portion has a second density, and the intermediate portion has a third density; wherein the third density is different from the first density and the second density.

[0012] In a preferred embodiment of the present application, the expansion mechanism is that the first side portion has a first thickness, the second side portion has a second thickness, and the intermediate portion has a third thickness; wherein the third thickness is different from the first thickness and the second thickness.

[0013] In a preferred embodiment of the present application, the first condition is that the interior of the balloon body is at a first inflation pressure, and the second condition is that the interior of the balloon body is at a second inflation pressure; wherein the first inflation pressure is less than the second inflation pressure.

[0014] In a preferred embodiment of the present application, the first side portion has a first auxiliary body, the second side portion has a second auxiliary body, and the intermediate portion has a third auxiliary body; wherein the expansion mechanism is that the third auxiliary body has a greater elastic coefficient than the first auxiliary body, and the third auxiliary body has a greater elastic coefficient than the second auxiliary body.

[0015] In a preferred embodiment of the present application, the first side portion has a first auxiliary body, the second side portion has a second auxiliary body, and the intermediate portion has a third auxiliary body; wherein the expansion mechanism is that the third auxiliary body has a third arrangement density greater than a first arrangement density of the first auxiliary body, and the third auxiliary body has the third arrangement density greater than a second arrangement density of the second auxiliary body.

[0016] In a preferred embodiment of the present application, the first side portion has a first auxiliary body, the second side portion has a second auxiliary body, and the intermediate portion has a third auxiliary body; wherein the expansion mechanism is that a third extension direction of the third auxiliary body is perpendicular to a surface extension direction of the balloon body, and a first extension direction of the first auxiliary body and / or a second extension direction of the second auxiliary body is parallel to the surface extension direction.

[0017] The foregoing and other aspects and embodiments of the present application are best understood from the following detailed description when read in connection with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1A A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0019] Figure 1B A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0020] Figure 1C A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0021] Figure 2A A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0022] Figure 2B A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0023] Figure 2C A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0024] Figure 3 A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0025] Figure 4 A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0026] Figure 5 A schematic view of an embodiment of a medical device for distracting a target site according to the present application.

[0027] Wherein the reference signs refer to:

[0028] 100 medical device

[0029] 110 stent body

[0030] 112 first side portion

[0031] 114 intermediate portion

[0032] 116 second side portion

[0033] 200 medical device

[0034] 210 balloon body

[0035] 212 first side portion

[0036] 214 intermediate portion

[0037] 216 second side portion

[0038] 220 inflation port

[0039] 300 medical device

[0040] 310 balloon body

[0041] 312 first side portion

[0042] 312A first auxiliary body

[0043] 312B first auxiliary body

[0044] 314 intermediate portion

[0045] 314A third auxiliary body

[0046] 314B third auxiliary body

[0047] 316 second side portion

[0048] 316A second auxiliary body

[0049] 316B second auxiliary body

[0050] 318 surface extension direction

[0051] 320 gas filling portion

[0052] 400 medical device

[0053] 410 balloon body

[0054] 412 first side portion

[0055] 412A first auxiliary body

[0056] 412B first auxiliary body

[0057] 412C first auxiliary body

[0058] 414 intermediate portion

[0059] 414A third auxiliary body

[0060] 414B third auxiliary body

[0061] 414C third auxiliary body

[0062] 416 second side portion

[0063] 416A second auxiliary body

[0064] 416B second auxiliary body

[0065] 416C second auxiliary body

[0066] 418 surface extension direction

[0067] 420 gas filling portion

[0068] 500 medical device

[0069] 510 balloon body

[0070] 512 first side portion

[0071] 512A first auxiliary body

[0072] 512B first auxiliary body

[0073] 514 intermediate portion

[0074] 514A third auxiliary body

[0075] 514B third auxiliary body

[0076] 516 second side portion

[0077] 516A second auxiliary body

[0078] 516B second auxiliary body

[0079] 518 surface extension direction

[0080] 520 inflation portion DETAILED DESCRIPTION

[0081] Reference is made to Figures 1A-1C , which illustrates a schematic view of a specific embodiment of a medical device for distracting a target site according to the present application. As shown in the specific embodiment of Figures 1A-1C , the medical device 100 for distracting a target site comprises a stent body 110 (in a specific embodiment, the medical device 100 is constituted by the stent body 110), which comprises a first side portion 112, an intermediate portion 114, and a second side portion 116. The intermediate portion 114 connects the first side portion 112 and the second side portion 116, and is disposed between the first side portion 112 and the second side portion 116. The medical device 100 has a distraction mechanism, which causes the first side portion 112 and the second side portion 116 to be in a first distracted state under a first condition (see Figure 1B , which shows the distracted state of the medical device 100 under the first condition), and causes the intermediate portion 114 to be in a second distracted state under a second condition (see Figure 1C , which shows the distracted state of the medical device 100 under the second condition). In Figure 1B the specific embodiment shown, the intermediate portion 114 does not assume the second distracted state under the first condition.

[0082] In a specific embodiment, a user can cause the stent body 110 of the medical device 100 to be in a contracted state (see Figure 1AThe medical device 100 is moved to place it in a target position in the target site. Then, the user can first place the stent body 110 in the first condition, so that the first side portion 112 and the second side portion 116 are in the first expanded state, and the middle portion 114 is in the contracted state. At this time, because the shape of the stent body 110 is similar to a dumbbell shape, the stent body 110 can be stabilized in the target position in the target site by the first side portion 112 and the second side portion 116 in the first expanded state, so that the stent body 110 can be prevented from sliding in the target site. Then, the user can again place the stent body 110 in the second condition, so that the middle portion 114 is in the second expanded state, and the expanding operation is completed. When the stent body 110 is in the second condition, the first side portion 112, the middle portion 114, and the second side portion 116 are all in the expanded state. It should be understood that the two-stage expanding method (the first stage is the dumbbell-shaped expanding state in the first condition, and the second stage is the full expanding state in the second condition) of the medical device for expanding the target site according to the present application can prevent the medical device from sliding in the target site during the expanding process, so that the positioning error can be avoided.

[0083] In an embodiment, the expanding mechanism of the medical device 100 is that the first side portion 112 is made of a first memory metal, the second side portion 116 is made of a second memory metal, and the middle portion 114 is made of a third memory metal. The first memory metal and the second memory metal return to their original shapes (the original shapes are the expanded states) in the first condition, so that the first side portion 112 and the second side portion 116 are in the first expanded state. The third memory metal returns to its original shape (the original shape is the expanded state) in the second condition, so that the middle portion 114 is in the second expanded state. The third memory metal does not return to its original shape in the first condition, so that the middle portion 114 is not in the second expanded state in the first condition.

[0084] In an embodiment, the medical device 100 is first in the first condition and then in the second condition during the expanding process. In an embodiment, the first condition is that the stent body 110 reaches a first temperature, and the second condition is that the stent body 110 reaches a second temperature. The first temperature is lower than the second temperature. In an embodiment, the stent body 110 can be first brought to the first temperature and then brought to the second temperature by perfusion of a liquid. It should be understood that, when the medical device for expanding a target site according to the present application is used, the stent body can be brought to the first temperature or the second temperature by energization or other methods according to requirements, instead of only by perfusion of a liquid.

[0085] Please refer to Figures 2A-2CThe illustration depicts a schematic diagram of a specific embodiment of a medical device for opening a target site according to this application. For example... Figures 2A-2C In the illustrated embodiment, the medical device 200 for expanding a target area includes a balloon body 210 and an inflation section 220. The balloon body 210 includes a first side portion 212, a middle portion 214, and a second side portion 216. The middle portion 214 connects the first side portion 212 and the second side portion 216, and is disposed between the first side portion 212 and the second side portion 216. The inflation section 220 is connected to the first side portion 212 of the balloon body 210, thus allowing fluid (e.g., gas or liquid) to be injected into the balloon body 210. Figures 2A-2C In the illustrated embodiment, the medical device 200 also has a spreading mechanism that, under a first condition, positions the first side 212 and the second side 216 in a first spread-out state (see [link]). Figure 2B It shows the medical device 200 in an open state under a first condition, and the opening mechanism causes the intermediate portion 214 to be in a second open state under a second condition (see [reference]). Figure 2C It shows the expanded state of the medical device 200 under the second condition. Figure 2B In the embodiment shown, the middle portion 214 will not be in a second open state under the first condition.

[0086] In one specific embodiment, the user can keep the balloon body 210 of the medical device 200 in a retracted state (see [link]). Figure 2A The diagram illustrates how, when the medical device 200 is in a contracted state, it is moved to position it at a target location within the target area. Next, the user can first position the balloon body 210 in a first condition, where the first side 212 and second side 116 are in a first expanded state, while the middle portion 214 is in a contracted state. Since the balloon body 210 is shaped like a dumbbell, the first side 212 and second side 216, in their first expanded state, can stabilize the balloon body 210 at the target location within the target area, thus preventing it from sliding within the target area. Then, the user can position the balloon body 210 in a second condition, where the middle portion 214 is in a second expanded state, thereby completing the incision procedure. When the balloon body 210 is in the second condition, the first side 212, middle portion 214, and second side 216 are all in an expanded state. It should be understood that the two-stage opening method of the medical device used in this application for opening the target area (the first stage is a dumbbell-shaped opening state under the first condition, and the second stage is a fully opened state under the second condition) can prevent the medical device from sliding within the target area during the opening process, thus avoiding positioning errors.

[0087] In one embodiment, the medical device 200 is configured to have a first side 112 having a first density, a second side 116 having a second density, and a middle portion 114 having a third density. The third density is different from the first density and the second density. In one embodiment, the third density is greater than the first density and the second density. The first condition is when the interior of the balloon body is at a first inflation pressure, and the second condition is when the interior of the balloon body is at a second inflation pressure. The first inflation pressure is less than the second inflation pressure. Thus, when the balloon body 210 is in the first condition, the first side 212 and the second side 116 are in a first expanded state, and the middle portion 214 is in a collapsed state. When the balloon body 210 is in the second condition, the first side 212, the middle portion 214, and the second side 216 are in an expanded state. In one embodiment, the first density is equal to the second density. In one embodiment, the medical device 200 is first in the first condition and then in the second condition during the expansion process.

[0088] In one embodiment, the medical device 200 is configured to have a first side 112 having a first thickness, a second side 116 having a second thickness, and a middle portion 114 having a third thickness. The third thickness is different from the first thickness and the second thickness. In one embodiment, the third thickness is greater than the first thickness and the second thickness. The first condition is when the interior of the balloon body is at a first inflation pressure, and the second condition is when the interior of the balloon body is at a second inflation pressure. The first inflation pressure is less than the second inflation pressure. Thus, when the balloon body 210 is in the first condition, the first side 212 and the second side 116 are in a first expanded state, and the middle portion 214 is in a collapsed state. When the balloon body 210 is in the second condition, the first side 212, the middle portion 214, and the second side 216 are in an expanded state. In one embodiment, the first thickness is equal to the second thickness. In one embodiment, the medical device 200 is first in the first condition and then in the second condition during the expansion process.

[0089] In one embodiment, the medical device for expanding a target site according to the present application is a vascular expansion device for use in a blood vessel (i.e., the target site), such as for expanding an arterial blood vessel or for expanding a venous blood vessel. It should be understood, however, that the medical device for expanding a target site according to the present application is not limited to being a vascular expansion device. That is, the medical device according to the present application is not limited to use in a blood vessel, but can be used to expand any site in the body as desired. Of course, the medical device for expanding a target site according to the present application will have different sizes depending on the size of the target site.

[0090] Referring to Figure 3 , which illustrates a schematic view of one embodiment of a medical device for expanding a target site according to the present application. As shown in Figure 3In the illustrated embodiment, the medical device 300 for dilating a target site includes a balloon body 310 and a gas inlet 320. The balloon body 310 includes a first side portion 312, a middle portion 314, and a second side portion 316. The middle portion 314 is connected to the first side portion 312 and the second side portion 316, and is disposed between the first side portion 312 and the second side portion 316. The gas inlet 320 is connected to the first side portion 312 of the balloon body 310, so that fluid (e.g., gas or liquid) can be introduced into the balloon body 310 through the gas inlet 320. The medical device 300 also has a dilation mechanism that causes the first side portion 312 and the second side portion 316 to assume a first dilated state (see, e.g., FIG. 2, which shows the dilated state of the medical device 200 under a first condition) under a first condition, and causes the middle portion 314 to assume a second dilated state (see, e.g., FIG. 3, which shows the dilated state of the medical device 200 under a second condition) under a second condition. The middle portion 314 does not assume the second dilated state under the first condition. Figure 2B Figure 2C

[0091] In some embodiments, the medical device 300 can include a plurality of balloon bodies 310, each having a first side portion 312, a middle portion 314, and a second side portion 316. The plurality of balloon bodies 310 can be connected to each other in series, and can be connected to the gas inlet 320. The plurality of balloon bodies 310 can be dilated simultaneously or sequentially. In some embodiments, the medical device 300 can include a plurality of gas inlets 320, each connected to a respective balloon body 310. The plurality of gas inlets 320 can be connected to a common fluid source (e.g., a gas source or a liquid source). The plurality of balloon bodies 310 can be dilated simultaneously or sequentially. Figure 3 ​​In the illustrated embodiment, the first side portion 312 has first auxiliary bodies 312A, 312B, the second side portion 316 has second auxiliary bodies 316A, 316B, and the middle portion 314 has third auxiliary bodies 314A, 314B. The first auxiliary bodies 312A, 312B have a first elastic coefficient, the second auxiliary bodies 316A, 316B have a second elastic coefficient, and the third auxiliary bodies 314A, 314B have a third elastic coefficient. The expansion mechanism of the medical device 300 is that the third elastic coefficient of the third auxiliary bodies 314A, 314B is greater than the first elastic coefficient of the first auxiliary bodies 312A, 312B, and the third elastic coefficient of the third auxiliary bodies 314A, 314B is greater than the second elastic coefficient of the second auxiliary bodies 316A, 316B. In this way, the medical device 300 can first be in the first condition and then in the second condition during the expansion process. In an embodiment, the first auxiliary bodies 312A, 312B, the second auxiliary bodies 316A, 316B, and the third auxiliary bodies 314A, 314B can be woven bodies. In an embodiment, the first auxiliary bodies 312A, 312B can be connected to the third auxiliary bodies 314A, 314B, respectively, and the second auxiliary bodies 316A, 316B can be connected to the third auxiliary bodies 314A, 314B, respectively. In another embodiment, the first auxiliary bodies 312A, 312B can not be connected to the third auxiliary bodies 314A, 314B, and the second auxiliary bodies 316A, 316B can not be connected to the third auxiliary bodies 314A, 314B. It should be understood that the extension direction of the first auxiliary bodies 312A, 312B can be parallel to the surface extension direction 318 of the balloon body 310 or can be perpendicular to the surface extension direction 318 of the balloon body 310, but not limited thereto. The extension direction of the second auxiliary bodies 316A, 316B can be parallel to the surface extension direction 318 of the balloon body 310 or can be perpendicular to the surface extension direction 318 of the balloon body 310, but not limited thereto. The extension direction of the third auxiliary bodies 314A, 314B can be parallel to the surface extension direction 318 of the balloon body 310 or can be perpendicular to the surface extension direction 318 of the balloon body 310, but not limited thereto.

[0092] Please refer to Figure 4 which illustrates a schematic diagram of an embodiment of a medical device for expanding a target site according to the present application. As shown in Figure 4In the illustrated embodiment, the medical device 400 for dilating a target site includes a balloon body 410 and a gas inlet 420. The balloon body 410 includes a first side portion 412, a middle portion 414, and a second side portion 416. The middle portion 414 is connected to the first side portion 412 and the second side portion 416, and is disposed between the first side portion 412 and the second side portion 416. The gas inlet 420 is connected to the first side portion 412 of the balloon body 410, so that fluid (e.g., gas or liquid) can be introduced into the balloon body 410 through the gas inlet 420. The medical device 400 also has a dilation mechanism that causes the first side portion 412 and the second side portion 416 to assume a first dilated state (see, e.g., FIG. 2, which shows the dilated state of the medical device 200 under a first condition) under a first condition, and causes the middle portion 414 to assume a second dilated state (see, e.g., FIG. 3, which shows the dilated state of the medical device 200 under a second condition) under a second condition. The middle portion 414 does not assume the second dilated state under the first condition. Figure 2B Figure 2C

[0093] In some embodiments, the medical device 400 can be used to dilate a target site in a patient's body. For example, the medical device 400 can be used to dilate a target site in a patient's body by introducing fluid into the balloon body 410 through the gas inlet 420, and then causing the first side portion 412 and the second side portion 416 to assume the first dilated state under the first condition, and causing the middle portion 414 to assume the second dilated state under the second condition. Figure 4 ​​In the embodiment shown, the first side portion 412 has first auxiliary bodies 412A, 412B, 412C, the second side portion 416 has second auxiliary bodies 416A, 416B, 416C, and the middle portion 414 has third auxiliary bodies 414A, 414B, 414C. Among them, the first auxiliary bodies 412A, 412B, 412C have a first arrangement density, the second auxiliary bodies 416A, 416B, 416C have a second arrangement density, and the third auxiliary bodies 414A, 414B, 414C have a third arrangement density. The expansion mechanism of the medical device 400 is that the third arrangement density of the third auxiliary bodies 414A, 414B, 414C is greater than the first arrangement density of the first auxiliary bodies 412A, 412B, 412C, and the third arrangement density of the third auxiliary bodies 414A, 414B, 414C is greater than the second arrangement density of the second auxiliary bodies 416A, 416B, 416C. In a specific embodiment, the first auxiliary bodies 412A, 412B, 412C, the second auxiliary bodies 416A, 416B, 416C, and the third auxiliary bodies 414A, 414B, 414C can be braided bodies. In a specific embodiment, the first auxiliary bodies can be connected to at least a part of the third auxiliary bodies, and the second auxiliary bodies can be connected to at least a part of the third auxiliary bodies. In another specific embodiment, the first auxiliary bodies can not be connected to the third auxiliary bodies, and the second auxiliary bodies can not be connected to the third auxiliary bodies. It should be understood that the extension direction of the first auxiliary bodies 412A, 412B, 412C can be set to be parallel to the surface extension direction 418 of the balloon body 410 as required, or can be set to be perpendicular to the surface extension direction 418 of the balloon body 410, but not limited thereto. The extension direction of the second auxiliary bodies 416A, 416B, 416C can be set to be parallel to the surface extension direction 418 of the balloon body 410 as required, or can be set to be perpendicular to the surface extension direction 418 of the balloon body 410, but not limited thereto. The extension direction of the third auxiliary bodies 414A, 414B, 414C can be set to be parallel to the surface extension direction 418 of the balloon body 410 as required, or can be set to be perpendicular to the surface extension direction 418 of the balloon body 410, but not limited thereto.

[0094] Please refer to Figure 5 which illustrates a schematic diagram of a specific embodiment of a medical device for expanding a target site according to the present application. As shown in Figure 5In the illustrated embodiment, the medical device 500 for dilating a target site includes a balloon body 510 and a gas filling portion 520. The balloon body 510 includes a first side portion 512, a middle portion 514, and a second side portion 516. The middle portion 514 is connected to the first side portion 512 and the second side portion 516, and is disposed between the first side portion 512 and the second side portion 516. The gas filling portion 520 is connected to the first side portion 512 of the balloon body 510, so that fluid (e.g., gas or liquid) can be filled into the balloon body 510 through the gas filling portion 520. The medical device 500 also has a dilation mechanism that causes the first side portion 512 and the second side portion 516 to be in a first dilated state under a first condition (see FIG. 2A, which shows the dilated state of the medical device 200 under the first condition), and causes the middle portion 514 to be in a second dilated state under a second condition (see FIG. 2B, which shows the dilated state of the medical device 200 under the second condition). The middle portion 514 is not caused to be in the second dilated state under the first condition. Figure 2B Figure 2C

[0095] In the illustrated embodiment, the first side portion 512 has first auxiliary bodies 512A, 512B, the second side portion 516 has second auxiliary bodies 516A, 516B, and the middle portion 514 has third auxiliary bodies 514A, 514B. The first auxiliary bodies 512A, 512B have a first extension direction, the second auxiliary bodies 516A, 516B have a second extension direction, and the third auxiliary bodies 514A, 514B have a third extension direction. The dilation mechanism of the medical device 500 is such that the third extension direction of the third auxiliary bodies 514A, 514B is perpendicular to a surface extension direction 518 of the balloon body 510, and the first extension direction of the first auxiliary bodies 512A, 512B and / or the second extension direction of the second auxiliary bodies 516A, 516B is parallel to the surface extension direction 518 of the balloon body 510. In one embodiment, the first auxiliary bodies 512A, 512B, the second auxiliary bodies 516A, 516B, and the third auxiliary bodies 514A, 514B can be braided bodies. In one embodiment, the first auxiliary bodies can be connected to the third auxiliary bodies, and the second auxiliary bodies can be connected to the third auxiliary bodies. In another embodiment, the first auxiliary bodies can not be connected to the third auxiliary bodies, and the second auxiliary bodies can not be connected to the third auxiliary bodies. Figure 5

[0096] ​​​Thus, medical devices for distracting a target site according to the present application have been described herein above with reference to the accompanying drawings. It should be understood, however, that various changes can be made without departing from the scope of the present application, which is defined only by the claims set forth below. Accordingly, the specific embodiments described herein are not intended to limit the true scope of the present application, which is defined only by the claims set forth below.

Claims

1. A medical device for opening a target area, comprising: First side section; A second side; and A middle portion connects the first side portion and the second side portion, and the middle portion is disposed between the first side portion and the second side portion; The medical device has a spreading mechanism that, under a first condition, causes the first side and the second side to be in a first spreading state, and under a second condition, causes the middle part to be in a second spreading state. Under the first condition, the middle part will not be in the second expanded state; The medical device has a support body, which includes the first side portion, the second side portion, and the middle portion; The spreading mechanism is as follows: the first side portion is made of a first shape memory metal, the second side portion is made of a second shape memory metal, and the middle portion is made of a third shape memory metal; wherein the first shape memory metal and the second shape memory metal cause the first side portion and the second side portion to be in the first spread state under the first condition, and the third shape memory metal causes the middle portion to be in the second spread state under the second condition; wherein the third shape memory metal does not cause the middle portion to be in the second spread state under the first condition. The first condition is that the support body reaches a first temperature, and the second condition is that the support body reaches a second temperature; wherein the first temperature is lower than the second temperature.

2. The medical device of claim 1, wherein the medical device, during an opening process, is first in the first condition and then in the second condition.

3. The medical device as claimed in claim 1, wherein the target site is a blood vessel, and the medical device is a blood vessel dilation device.

4. A medical device for opening a target area, comprising: First side section; A second side; and A middle portion connects the first side portion and the second side portion, and the middle portion is disposed between the first side portion and the second side portion; The medical device has a spreading mechanism that, under a first condition, causes the first side and the second side to be in a first spreading state, and under a second condition, causes the middle part to be in a second spreading state. Under the first condition, the middle part will not be in the second expanded state; The medical device includes a balloon body, which comprises a first side portion, a second side portion, and a middle portion; The spreading mechanism is such that the first side has a first density, the second side has a second density, and the middle part has a third density; wherein the third density is different from the first density and the second density. The first condition is that the inside of the balloon body is at a first infusion pressure, and the second condition is that the inside of the balloon body is at a second infusion pressure; wherein the first infusion pressure is less than the second infusion pressure.

5. A medical device for opening a target area, comprising: First side section; A second side; and A middle portion connects the first side portion and the second side portion, and the middle portion is disposed between the first side portion and the second side portion; The medical device has a spreading mechanism that, under a first condition, causes the first side and the second side to be in a first spreading state, and under a second condition, causes the middle part to be in a second spreading state. Under the first condition, the middle part will not be in the second expanded state; The medical device includes a balloon body, which comprises a first side portion, a second side portion, and a middle portion; The spreading mechanism is such that the first side has a first thickness, the second side has a second thickness, and the middle part has a third thickness; wherein the third thickness is different from the first thickness and the second thickness. The first condition is that the inside of the balloon body is at a first infusion pressure, and the second condition is that the inside of the balloon body is at a second infusion pressure; wherein the first infusion pressure is less than the second infusion pressure.

6. A medical device for opening a target site, comprising: First side section; A second side; and A middle portion connects the first side portion and the second side portion, and the middle portion is disposed between the first side portion and the second side portion; The medical device has a spreading mechanism that, under a first condition, causes the first side and the second side to be in a first spreading state, and under a second condition, causes the middle part to be in a second spreading state. Under the first condition, the middle part will not be in the second expanded state; The medical device includes a balloon body, which comprises a first side portion, a second side portion, and a middle portion; The first side portion has a first auxiliary body, the second side portion has a second auxiliary body, and the middle portion has a third auxiliary body; wherein the spreading mechanism is that the elastic coefficient of the third auxiliary body is greater than the elastic coefficient of the first auxiliary body, and the elastic coefficient of the third auxiliary body is greater than the elastic coefficient of the second auxiliary body. The first condition is that the inside of the balloon body is at a first infusion pressure, and the second condition is that the inside of the balloon body is at a second infusion pressure; wherein the first infusion pressure is less than the second infusion pressure.

7. A medical device for opening a target area, comprising: First side section; A second side; and A middle portion connects the first side portion and the second side portion, and the middle portion is disposed between the first side portion and the second side portion; The medical device has a spreading mechanism that, under a first condition, causes the first side and the second side to be in a first spreading state, and under a second condition, causes the middle part to be in a second spreading state. Under the first condition, the middle part will not be in the second expanded state; The medical device includes a balloon body, which comprises a first side portion, a second side portion, and a middle portion; The first side portion has a first auxiliary body, the second side portion has a second auxiliary body, and the middle portion has a third auxiliary body; wherein the spreading mechanism is that the third arrangement density of the third auxiliary body is greater than the first arrangement density of the first auxiliary body, and the third arrangement density of the third auxiliary body is greater than the second arrangement density of the second auxiliary body. The first condition is that the inside of the balloon body is at a first infusion pressure, and the second condition is that the inside of the balloon body is at a second infusion pressure; wherein the first infusion pressure is less than the second infusion pressure.

8. A medical device for opening a target area, comprising: First side section; A second side; and A middle portion connects the first side portion and the second side portion, and the middle portion is disposed between the first side portion and the second side portion; The medical device has a spreading mechanism that, under a first condition, causes the first side and the second side to be in a first spreading state, and under a second condition, causes the middle part to be in a second spreading state. Under the first condition, the middle part will not be in the second expanded state; The medical device includes a balloon body, which comprises a first side portion, a second side portion, and a middle portion; The first side portion has a first auxiliary body, the second side portion has a second auxiliary body, and the middle portion has a third auxiliary body; wherein the spreading mechanism is that a third extending direction of the third auxiliary body is perpendicular to a surface extending direction of the balloon body, and a first extending direction of the first auxiliary body and / or a second extending direction of the second auxiliary body is parallel to the surface extending direction. The first condition is that the inside of the balloon body is at a first infusion pressure, and the second condition is that the inside of the balloon body is at a second infusion pressure; wherein the first infusion pressure is less than the second infusion pressure.

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