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JP-7854703-B2 - Bed with a reclining backrest

JP7854703B2JP 7854703 B2JP7854703 B2JP 7854703B2JP-7854703-B2

Inventors

  • 清本 太郎
  • 指方 玲美

Assignees

  • 株式会社プラッツ

Dates

Publication Date
20260507
Application Date
20220329

Claims (7)

  1. In a bed with a standable back base, The aforementioned back bottom has an upper back bottom located on the user's head side and a lower back bottom provided between the upper back bottom and the waist bottom. The aforementioned back bottom is rotatable around a back bottom pivot axis provided at the lower end of the lower back bottom, During the back-raising process, in which the back bottom is raised from horizontal to the maximum angle around the back bottom pivot axis, the back bottom is configured to retract and rise together with the back bottom pivot axis. The retraction distance M1 and the upward movement distance M2 of the back bottom during the back-raising process are in the following range groups: M1 = 5-10 cm and M2 = 5-15 cm, M1 = 6-10 cm and M2 = 6-15 cm, M1 = 7-10 cm and M2 = 7-15 cm, M1 = 8-10 cm and M2 = 8-15 cm, M1 = 8-10 cm and M2 = 12-15 cm A bed located within one of the selected areas.
  2. In the bed according to claim 1, It has a frame that supports the back bottom and the waist bottom, A bed further comprising a back bottom moving mechanism between the back bottom pivot shaft and the frame, which allows the back bottom and the back bottom pivot shaft to move back and up together relative to the frame.
  3. In the bed described in claim 2, The aforementioned back bottom movement mechanism has a first link and a second link, One end of the first link and one end of the second link are rotatably connected to each other via the back bottom pivot axis. A bed in which the other end of the first link is slidably mounted along the frame, and the other end of the second link is rotatably fixed to the frame.
  4. In the bed described in claim 1, The upper back bottom is configured to bend forward relative to the lower back bottom at a back bottom bending axis located between them. A bed in which, when the back bottom is horizontal, the distance L1 from the back bottom rotation axis to the back bottom bending axis is within the range of 20 to 42 cm.
  5. In the bed according to claim 1, The upper back bottom is configured to bend forward relative to the lower back bottom at a back bottom bending axis located between them. A bed configured such that when the patient lies on the base with the base horizontal and the patient is positioned on the base such that the pivot axis of the base is located directly below the patient's anterior superior iliac spine, the flexion axis of the base is located directly below the patient's thoracic vertebrae from the 10th to the 7th thoracic vertebrae.
  6. In the bed according to claim 2 or 3 , The frame has a knee bottom that allows the knee to be raised, and a leg bottom that includes a foot bottom, When the knee is raised, the knee is configured to flex relative to the foot at a leg bottom flexion axis provided between them. A bed in which, when the back bottom and the leg bottom are horizontal, the distance L2 from the pivot axis of the back bottom to the bending axis of the leg bottom is in the range of 42 to 49 cm.
  7. In the bed according to claim 2 or 3 , The frame has a knee bottom that allows the knee to be raised, and a leg bottom that includes a foot bottom, When the knee is raised, the knee is configured to flex relative to the foot at a leg bottom flexion axis provided between them. When the patient is lying on the base with the back base and leg base horizontal, and the back base is positioned on the back base such that the pivot axis of the back base is located directly below the anterior superior iliac spine of the patient, A bed in which, when the back bottom and the knee bottom are horizontal, the leg bottom flexion axis is located directly below the patient's knee joint, or directly below a point closer to the waist than the knee joint.

Description

Applicable under Article 30, Paragraph 2 of the Patent Law. On display at the 48th International Home Care & Rehabilitation Exhibition at Tokyo Big Sight Aomi Exhibition Hall from November 10th to 12th, 2021. Websites: https://youtu.be/UssTN03LQw (Published October 28th, 2021), https://youtu.be/6bYalsrTMWo (Published November 15th, 2021), https://youtu.be/KmjJIadL4Uo (Published December 7th, 2021). This invention relates to a bed having a backrest that can be raised and lowered by the action of a backrest actuator, and more particularly to a technique for retracting and raising the backrest during backrest raising operation. Conventional devices of this type are described, for example, in Patent Document 1 or 2. Patent Document 1 discloses a bed configured to move the backrest diagonally upward toward the headboard in order to prevent the patient's body from sliding toward the legs when the backrest is raised using an actuator. Patent Document 2 discloses a bed designed to prevent the patient's body from sliding towards the legs by moving the back support towards the head while simultaneously raising the knee support at the knee base. Japanese Patent Application Publication No. 7-16263Japanese Patent Publication No. 2020-114487 The images show a side view (A) of a bed according to one embodiment when the back bottom is upright at a predetermined maximum angle, and a side view (B) when the bed is lying horizontally.This side view clearly shows how the backrest and its pivot axis move during the process of raising the back of the bed.A simplified side view is shown, illustrating the main components of the mechanism that moves the pivot axis of the backrest bottom when the backrest is raised.The model used for the theoretical calculation of the backward and upward distances of the back bottom during back elevation is shown.The results of an evaluation experiment on the backward and upward distances of the back bottom during back elevation are shown.This shows the preferred position range for the dorsal bottom flexion axis and the leg bottom flexion axis.A simple model is shown illustrating the standard spinal midline shape and thoracic spine alignment when a patient is seated with their upper body naturally upright. Figure 1 shows a side view (A) of a bed according to one embodiment, with the backrest at its highest angle, and a side view (B) of the bed in a horizontal position. As shown in Figure 1, the bed 1 has a base 2, which is mounted on a liftable frame 3. Typically, a mattress is placed on the base 2, and the patient lies on it. The base 2 has a back base 2A that supports the patient's upper body, a lumbar base 2B that supports the patient's buttocks (waist), a knee base 2C that supports the patient's thighs, and a foot base 2D that supports the patient's lower legs and feet. Its sub-bottoms 2A to 2D are driven by one or more electric actuators and can bend relative to each other. The knee base 2C and foot base 2D together are hereinafter referred to as the "leg base." The backrest bottom 2A can be raised or lowered by rotating around the backrest bottom pivot axis 5. The upright movement of the backrest bottom 2A is achieved by an upward force applied to the backrest bottom 2A via the backrest lifting link 9 from an electric actuator 7 supported by the lifting frame 3. The backrest bottom pivot axis 5 moves in conjunction with the backrest lifting by a backrest bottom movement mechanism 11 attached to the lifting frame 3. During the back-raising process, in which the back base 2A rises from the horizontally reclined position shown in Figure 1(B) to the maximum angle shown in Figure 1(A) (for example, 70 degrees relative to the horizontal), the back base 2A and the back base pivot axis 5 move diagonally upward and towards the patient's head (or backward when the back base is upright) (leftward in the figure) due to the action of the back base movement mechanism 11. The movement of the back base 2A towards the head (or backward) is referred to as "retraction," and the upward movement is referred to as "ascension." The retraction distance M1 and the ascension distance M2 of the back base 2A are set within a preferred range as described later. The back support base 2A has an upper back support base 2E that supports the portion of the upper body from approximately the upper half of the thoracic spine to the head, and a lower back support base 2F that supports the portion of the upper body from approximately the lower half of the thoracic spine to the lumbar spine. These upper and lower back support bases 2E and 2F are connected to each other via a back support base flexion axis 13, allowing them to bend relative to one another. Through the action of the electric actuator 12, the upper back support base 2E rotates relative to the lower back support base 2F around the back support base flexion axis 13, allowing it to bend forward for the patient. The waist base 2B is fixed in a fixed position on the lifting