根据图片，解释智能假肢的原理、作用和前景---**Extracted Content:** **Figure Caption:** Fig. 4 Neural interface technology and the sensory neuroprosthesis. Cuff electrodes implanted on nerves connect to an external stimulator. FSRs in an insole detect pressure, which triggers electrical stimulation on cuff contacts, creating sensations matching the pressure profile under the prosthetic foot. LL01 and LL02 reported sensations in missing toes and heels (FSRs force-sensing resistors, LL lower limb). Published with permission from [64] 2020 Springer-Nature. **Diagram Description:** The image contains three main panels labeled a, b, and c, illustrating a neural interface technology and sensory neuroprosthesis. **Panel a:** * **Type:** Illustration * **Main Elements:** * A person with a prosthetic leg is shown sitting on a chair. * An external electronic device is placed on the person's right thigh. * Wires extend from the external device towards the prosthetic leg and towards the upper leg (thigh). * **Inset 1 (Labeled "Nerve cuff"):** Shows a close-up view of a flexible flat device with multiple electrical contacts arranged linearly, and connecting wires. * **Inset 2 (Labeled "Cuff closed on nerve"):** Shows a close-up view of a flexible cuff device wrapped around a bundle of nerves (represented as yellowish tubes). **Panel b:** * **Type:** Illustration and Flow Diagram * **Main Elements:** * A person with a prosthetic leg is shown ascending stairs while holding a handrail. * A blue shaded area is shown on the top-right part of the person's head, possibly representing the somatosensory cortex or perception area. * Three numbered insets illustrate different parts of the system, connected by curved arrows indicating a process or flow of information. * **Inset 1 (Labeled "1"):** Shows the prosthetic foot with an insole containing multiple circular sensors. A side view of the prosthetic foot is also shown. * **Inset 2 (Labeled "2"):** Shows a close-up view of a nerve bundle in the leg with cuff electrodes wrapped around it. * **Inset 3 (Labeled "3"):** Shows a close-up view of the person's right foot wearing a shoe, likely representing the intact limb for comparison or reference. * **Arrows:** A large blue curved arrow points from Inset 1 upwards towards Inset 2. Another large blue curved arrow points from Inset 2 upwards towards the blue shaded area on the head. A third blue curved arrow points from Inset 3 upwards towards the blue shaded area on the head. This suggests pressure sensing in the prosthetic foot (1) leads to nerve stimulation (2), and both sensations from the prosthetic leg (via nerve stimulation) and the intact leg (3) are perceived in the brain. **Panel c:** * **Type:** Diagrams illustrating sensation mapping. * **Main Elements:** * A device with multiple contacts is shown on the left, with arrows pointing to diagrams of feet. Insets show zoomed-in views of groups of contacts on this device. This device represents the external stimulator and/or connection points. * Two diagrams labeled "LL01" and "LL02" are shown. * **LL01:** Shows the sole of a foot with the forefoot/toes area highlighted in red and the heel area highlighted in yellow. An arrow from a part of the device on the left points to the red area, and an arrow from another part points to the yellow area. * **LL02:** Shows the sole of a foot with the forefoot/toes area highlighted in red and the heel area highlighted in yellow. It also shows a side view of the foot with the sole and heel highlighted in yellow. An arrow from a part of the device on the left points to the red area, and an arrow from another part points to the yellow area. * The diagrams illustrate how stimulation patterns on the nerve cuff (linked to the device on the left) correspond to perceived sensations in specific areas of the missing foot (red for toes/forefoot, yellow for heel). * **Labels:** "LL01", "LL02".