CN112089572A - Postural adjustment system applied in minimally invasive total hip arthroplasty through direct anterior approach - Google Patents

Abstract

The invention relates to a body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty. The transmission line is connected, and the position air bag device is inflated or deflated by controlling the intelligent digital air pump power device; the position air bag device includes an air bag switch and an air cushion, and the air cushion is divided into two types, namely the acetabular side sacroiliac joint adjustment air cushion and the air cushion. The air cushion is adjusted at the proximal end of the femur; the air bag switch is arranged between the intelligent digital air pump power unit and the position air bag device, and the air bag switch is connected to each independent air cushion in the position air bag device, which is used to raise or lower according to the operation side and intraoperative needs. The lowered position requires inflation or deflation of the various bladders. The body position adjustment system of the present invention can adjust the heights of the acetabular side and the proximal femur at any time according to the body position requirements during the operation, so as to facilitate the operation.

Description

Postural adjustment system applied in minimally invasive total hip arthroplasty through direct anterior approach

technical field

The invention relates to the field of medical auxiliary equipment, in particular to a body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty.

Background technique

Direct anterior approach minimally invasive total hip arthroplasty conforms to the concept of minimally invasive and rapid recovery surgery, and is gradually recognized by more surgeons. Good exposure at the end to reduce damage to patients due to poor exposure, as follows:

1. When dealing with the acetabular side, it can raise the acetabulum while sinking the proximal end of the femur, which is good Control the anteversion angle and abduction angle of the acetabular reamer, which is conducive to more accurate placement of the prosthesis;

2. When dealing with the proximal femur, the proximal femur should be raised and the acetabulum should be lowered at the same time, so as to avoid the fracture of the proximal femur or the pressure injury of the tensor fascia lata by simply using the greater trochanter retractor violently upward.

There are many reasons for the serious inconsistency between the theoretical advantages and actual clinical results of direct anterior minimally invasive total hip arthroplasty. On the one hand, because the direct anterior approach is operated through the anatomical approach of the nerve-muscle space, the operator's clinical anatomical knowledge is highly required, and there is no solid basic anatomical knowledge, which is easy to cause the gap to go wrong, bringing new opportunities to the patient. damage. On the other hand, the osteotomy, release and prosthesis installation of the hip joint in the muscle space requires good coordination of muscle relaxation and anesthesia and the surgeon’s experience in protecting the surrounding muscles during the operation. It will increase the difficulty of exposure operation, delay the operation time, increase intraoperative bleeding and soft tissue damage. In addition, the cooperation of assistants during surgery and the use of instruments or traction frames for the affected limbs are also important factors affecting the surgical treatment. Improper placement of the affected limbs during surgery and insufficient exposure will cause soft tissue damage, fractures and other joint injuries.

The exposure in the direct anterior approach is mainly through the traction of the instrument on the soft tissue and the traction of the traction frame on the affected limb and the adjustment of the position of the affected limb, so as to achieve the proper exposure of the acetabulum and the proximal femur, and facilitate the osteotomy of the femoral neck. Hip release and installation of the acetabular cup to the proximal femoral stem. The retractor uses leverage to retract soft tissues such as muscles. Long-term squeezing and pulling can cause muscle tissue ischemia, mechanical strain injury, and adipose tissue liquefaction. The traction of the affected limb through the traction frame and the position adjustment and placement at any time can easily cause excessive strength and angle, resulting in sprain or fracture of the ankle joint, and bring new iatrogenic damage. These are the urgent clinical problems faced by direct anterior approach minimally invasive total hip arthroplasty.

In order to avoid the above-mentioned intraoperative damage as much as possible, scholars mainly avoid it through the following aspects:

①Strengthen intraoperative anesthesia management. By increasing the intraoperative muscle relaxant dose, muscle relaxation can be achieved, which is conducive to intraoperative muscle retraction, avoids muscle reactive contraction during retraction, affects the exposure of the surgical field, and reduces violent retraction. happened.

②Configure appropriate anterior approach minimally invasive total hip surgical instruments, and customize different shapes of retractors according to the needs of different surgical steps. The hooks have blunt edges and various angles, including muscle retractors, Hoffman Retractors, greater trochanter retractors, etc., are convenient for intraoperative exposure without damaging the surrounding soft tissue.

③ Abandon the use of the traction bed and use the assistant to manually change the position of the affected limb, which can well ensure that the traction force and rotation angle can be sensed at any time. Patients bring iatrogenic damage.

There are still the following shortcomings in the current prior art:

①In terms of anesthesia management, the use of large doses of muscle relaxants will bring more harm to the patient's body, including affecting the cardiopulmonary function, increasing the metabolic burden of the liver and kidney, especially in elderly patients, increasing the risk of anesthesia management. A large amount of muscle relaxants will obviously delay the recovery of patients from anesthesia, and prolonged anesthesia will bring more harm to the patient's body.

②In terms of the design and use of special surgical instruments, although the intraoperative and instrument manufacturers have specially designed and improved the instruments according to the special operation of the direct anterior approach minimally invasive total hip arthroplasty, for some patients with special constitutions, such as obesity or Strong patients still need to use violent stretching to obtain a better surgical field of vision. However, violent stretching and squeezing will inevitably cause muscle rupture and fat liquefaction, which will eventually lead to poor incision healing and slow postoperative recovery.

③Abandoning the use of the traction bed during the operation can avoid the damage of the ankle joint due to violent and improper stretching and rotation, but the assistant is used to pull and adjust the position of the affected limb at any time. On the one hand, the assistant needs to be more familiar with the operation. Cooperate well with the chief surgeon. On the other hand, the assistant needs to have good physical strength and experience. The adjustment of manual traction and body position will obviously increase the burden on the assistant, and the satisfaction of exposure will vary depending on the assistant's experience. The extent to which it affects the progress and effect of surgery.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty, which mainly includes two parts, namely the acetabular side sacroiliac joint adjustment air cushion and the femoral proximal end adjustment air cushion. The invented body position adjustment system can adjust the heights of the acetabular side and the proximal end of the femur at any time according to the requirements of the body position during the operation, so as to facilitate the operation.

For achieving the above object, the technical scheme provided by the present invention is:

A body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty, comprising an intelligent digital air pressure pump power device and a body position airbag device, and air pressure is passed between the body position airbag device and the intelligent digital air pressure pump power device The transmission line is connected, and the position air bag device is inflated or deflated by controlling the intelligent digital air pressure pump power device; the position air bag device includes an air bag switch and an air cushion, wherein the air cushion is divided into two types, namely the acetabular side sacroiliac joints. The air cushion is adjusted and the air cushion is adjusted at the proximal end of the femur; the air bag switch is arranged between the intelligent digital air pressure pump power device and the position air bag device, and the air bag switch is connected to each independent air cushion in the position air bag device. The position that needs to be raised or lowered during the operation needs to be inflated or deflated with different balloons.

Further, the acetabular side sacroiliac joint adjustment air cushion includes a left sacroiliac joint air cushion and a right sacroiliac joint air cushion, and the left sacroiliac joint air cushion is placed under the left sacroiliac joint during the operation, The right sacroiliac joint air cushion is placed under the right sacroiliac joint during the operation.

Further, the proximal femur adjustment air cushion includes a left proximal femoral air cushion and a right proximal femoral air cushion, and the left proximal femoral air cushion is placed under the left proximal femur during the operation, and the The right proximal femur air cushion was placed under the right proximal femur during the operation.

Further, the left sacroiliac joint air cushion is a larger air bag, and the left proximal femur air cushion is a smaller air bag adjacent to the left sacroiliac joint air cushion.

Further, the air cushion of the right sacroiliac joint is a larger air bag, and the air cushion at the proximal end of the right femur is a smaller air bag adjacent to the air cushion of the right sacroiliac joint.

Further, the intelligent digital air pressure pump power device is provided with an air pressure adjustment knob and an airbag switching knob, the air pressure adjustment knob is used to control inflation or deflation, and the airbag switching knob is used to control the airbag switcher switching. Inflate or deflate the bladder.

Further, a liquid crystal display screen is arranged on the intelligent digital air pressure pump power device, and the liquid crystal display screen is used to display the current air bag and air pressure state.

Compared with the prior art, the beneficial effects of the present invention are:

The body position adjustment system applied in the direct anterior approach minimally invasive total hip arthroplasty of the present invention has outstanding features:

① When dealing with the acetabular side, the air cushion on the acetabular side is raised to a certain height according to the needs to raise the acetabulum, and at the same time, the air cushion on the proximal side of the femur is deflated, so that the proximal end of the femur is relatively sinking, so as to avoid blocking the placement of the acetabular ream and facilitate the Grinding the acetabulum, good exposure and placement of the acetabulum, is very important to control the proper anteversion and abduction angles of the acetabular and prosthesis installation.

②When the proximal femur is treated, the air cushion at the proximal end of the femur is raised to a certain height as required to raise the proximal end of the femur, and at the same time the air cushion on the acetabular side is deflated, so that the acetabular side is relatively sinking, so as to avoid the high proximal end of the incision affecting the medullary cavity The placement and reaming of the rasp, the good exposure and placement of the proximal femur, and the control of the anteversion angle of the femoral stem for rasp reaming are important to prevent the fracture of the proximal femur or the rasp going out of the medullary cavity during reaming. .

In terms of the technical operation of the joint surgeon, the existing traction bed used in the direct anterior approach total hip arthroplasty is cumbersome, and the installation before and after the operation is more troublesome. more manpower. The body position adjustment system developed and designed by the present invention is relatively light in size, with a total weight of less than 5Kg, and can be carried with you. It is easy to operate during the operation, can intelligently and flexibly adjust the height of the acetabulum or proximal femur osteotomy surface, and is easier to achieve a good exposure field of view. It is convenient for the surgeon to control the angle of the acetabular fossa during surgery (acetabular anteversion angle and abduction angle), and the good exposure of the proximal femoral fracture surface is conducive to the reaming of the femoral medullary cavity, and the correct installation of the femoral stem. Difficulty of operation, shorten operation time and improve work efficiency.

In terms of patient benefit, the traction bed can achieve good exposure by fixing the patient's pubic symphysis and the affected foot and ankle to adjust the limbs for longitudinal traction, external rotation and adduction, etc., because the force cannot be monitored during the process of traction and angle adjustment. , There are reports of intraoperative complications of ankle sprain, dislocation and fracture due to improper traction. The body position adjustment system designed by the invention is placed under the acetabulum and the proximal end of the femur, which will not cause iatrogenic injury to the ankle joint, and at the same time, the sufficient exposure of the acetabulum and the proximal end of the femur during the operation can reduce the improper placement of the acetabular prosthesis angle. Risks and avoidance of the risk of perforating the cortical bone and hitting the outside of the femoral canal due to improper reaming angle of the intramedullary rasp. Improper position of the acetabular prosthesis will accelerate the wear of the prosthesis, reduce the service life, and increase the risk of femoral fracture due to damage to the femoral cortex. If it is not detected in time during the operation, a second surgery will be required. caused great harm, while increasing medical costs and delaying his return to normal working life. In addition, it avoids the use of instruments to stretch soft tissues (muscles, etc.) and violently poking bones to achieve good exposure, and also reduces the dosage of muscle relaxants to a certain extent, shortens the operation time to a certain extent, and reduces the Intraoperative bleeding can reduce the incidence of soft tissue injury and fracture, which is conducive to better early postoperative recovery of patients and shortens hospitalization time.

In terms of the economic benefits of the cost of equipment in the department, some scholars have developed a traction bed for the affected limb based on the particularity of the intraoperative operating position of the direct anterior approach total hip arthroplasty, which can be used to change the position during the operation and facilitate the exposure of the surgical field. However, the price of traction beds is relatively expensive. The price of imported traction beds is between 500,000 and 600,000, and the domestic traction bed is about 150,000, which brings a great economic burden to the joint surgery and operating room to purchase traction bed equipment. , The body position adjustment system developed and designed by the present invention is relatively light in size, with a total weight of less than 5Kg, which can be carried around, easy to operate during operation, and the total production cost is less than 10,000 yuan, which greatly reduces the economic expenditure of department instruments.

Description of drawings

FIG. 1 is a schematic structural diagram of the body position adjustment system of the present invention applied in direct anterior approach minimally invasive total hip arthroplasty.

Figure 2: Inflating the balloon below the sacroiliac joint on the acetabular side of the surgical side raises the acetabulum and sinks the proximal femur to fully expose the acetabulum.

Figure 3: The air pressure of the airbag below the sacroiliac joint on the acetabular side of the operation side is completely released, the operating table is adjusted so that the lower limb is extended 30°-45°, the lower limb is externally rotated to 90°, and the airbag is adducted by 30°. Inflate, elevate the proximal femur.

In the picture: 1- Intelligent digital air pump power unit, 2- Postural air bag device, 3- Air bag switch, 4- Air pressure transmission line, 5- Air pressure adjustment knob, 6- Air bag switch knob.

Detailed ways

The present invention will be described in further detail below in conjunction with specific embodiments. The following examples are only used to illustrate the present invention and not to limit the scope of the present invention.

A body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty, comprising an intelligent digital air pressure pump power device 1 and a body position airbag device 2, the body position airbag device 2 and the intelligent digital air pressure pump power device 1 They are connected by an air pressure transmission line 4, and the position airbag device 2 is inflated or deflated by controlling the intelligent digital air pressure pump power device 1; the body position airbag device 2 includes an airbag switch 3 and an air cushion, wherein the air cushion is divided into two types. , respectively, the acetabular side sacroiliac joint adjustment air cushion and the femur proximal end adjustment air cushion; the air bag switch 3 is arranged between the intelligent digital air pump power device 1 and the position air bag device 2, and the air bag switch 3 is connected to the position air bag device. Each independent air cushion in 2 is used to inflate or deflate different air bags according to the operation side and the position that needs to be raised or lowered during the operation.

The acetabular side sacroiliac joint adjustment air cushion includes a left sacroiliac joint air cushion and a right sacroiliac joint air cushion. The left sacroiliac joint air cushion is placed under the left sacroiliac joint during the operation. The right sacroiliac joint air cushion was placed under the right sacroiliac joint during the operation.

In a specific embodiment, the proximal femoral adjustment air cushion includes a left proximal femoral air cushion and a right proximal femoral air cushion, and the left proximal femoral air cushion is placed under the left proximal femur during the operation, so the The described right proximal femur air cushion was placed under the right proximal femur during the operation.

Wherein, the left sacroiliac joint air cushion is a larger air bag, and the left proximal femur air cushion is a smaller air bag adjacent to the left sacroiliac joint air cushion.

Wherein, the air cushion for the right sacroiliac joint is a larger air bag, and the air cushion at the proximal end of the right femur is a smaller air bag adjacent to the air cushion for the right sacroiliac joint.

Wherein, the intelligent digital air pressure pump power device 1 is provided with an air pressure adjustment knob 5 and an airbag switching knob 6, the air pressure adjustment knob 5 is used to control inflation or deflation, and the airbag switching knob 6 is used to control The airbag switcher 3 switches the inflation or deflation of the airbag.

The intelligent digital air pressure pump power device 1 is provided with a liquid crystal display screen, and the liquid crystal display screen is used to display the current air bag and air pressure state.

As shown in Figure 1, in a specific embodiment of the present invention, the positional airbag device is placed at the position below the patient's sacroiliac joint and the proximal end of the femur, that is, in Figure 1: A (left sacroiliac joint air cushion), a (Left proximal femur air cushion) were placed under the patient's left sacroiliac joint and left proximal femur, B (right sacroiliac joint air cushion), b (right proximal femoral air cushion) were placed on the patient's right side Below the sacroiliac joint and the proximal end of the right femur. The air bag switcher can inflate or deflate different air bags according to the operation side and the side that needs to be raised or lowered during the operation.

As shown in Figures 2 and 3, when the body position adjustment system of the present invention is applied to direct anterior approach total hip arthroplasty:

①The placement of the patient's body position and the placement of the body position adjustment system: the patient is placed in a supine position, the movable joint of the operating bed is located 10cm below the pubic symphysis, and the positional balloon is placed just below the bilateral sacroiliac joints and the proximal femur. The lower extremity was elevated by 30°, and the lower extremity was abducted by 30°. The tensor fascia lata, sartorius, rectus femoris, and gluteus medius were relaxed to facilitate intraoperative exposure until the femoral head was removed after femoral neck osteotomy. This procedure does not require inflation of any air bag on the affected side.

② Release the joint capsule to polish the acetabulum and install the acetabular prosthesis: In this step, the air bag under the acetabulum side (sacroiliac joint), namely the A or B air bag, is inflated, so that the acetabulum is lifted to an appropriate height and the femur is close to the femur. The end sinks to achieve good acetabular exposure, as shown in Figure 2. Take the small "4" font position for the lower limbs, properly release the medial and lateral joint capsules, clean the labrum and ligaments in the labrum and acetabular fossa ovalis. The acetabulum was ground, and the acetabular reamers were placed at an angle of 42° abduction and 12° anteversion. Grind to appropriate size and install the corresponding acetabular cup and liner.

③ Expose the proximal end of the femur for reaming and install the femoral stem: After the acetabular side is treated, the air pressure of the acetabular side airbag (A or B) is completely released, the lower limb is extended 40° by adjusting the operating table, and the assistant externally rotates the lower limb to 90° °, add 30°, at the same time inflate the balloon below the proximal end of the femur, elevate the proximal end of the femur, and use the greater trochanter retractor to assist in exposure if necessary. Corresponding type of femoral stem.

④ Install the femoral head, reset the prosthesis, and close the incision: After the femoral stem is installed, select the corresponding femoral head according to the length of the femoral neck, and completely deflate the airbag below the proximal femur so that the proximal femur is lowered to the level of the acetabulum, and the hip joint Horizontal traction and internal rotation of the lower limbs were used to reduce the hip joint, and the incision was sutured layer by layer.

The body position adjustment system of the present invention applied to the direct anterior approach minimally invasive total hip arthroplasty achieves good exposure of the acetabular side and the proximal femur side in the limited muscle space, whether it is possible for the direct anterior approach total hip arthroplasty It is very important to achieve a good postoperative rehabilitation effect smoothly. The intelligent digital air pressure pump power device can raise or lower the treatment position by increasing or decreasing the air pressure at any time and adjusting the height of the air bag according to the required field of vision during the operation ( The height of the acetabulum or proximal femur) is convenient for grinding the reaming of the acetabulum or femoral canal. In addition, when dealing with the acetabular side, the specific height of the acetabulum can be obtained, which is helpful for the operator to control the abduction angle and anteversion angle of the acetabular reamer, and obtain a more accurate acetabular prosthesis installation.

In order to better expose the operative field of view of direct anterior approach total hip arthroplasty and deal with the above-mentioned traction bed scheme, other alternatives can be used, such as changing the patient's intraoperative position, changing the supine position to the lateral position, but the lateral position It increases the tedious steps to fix the body position, and the lateral position is not conducive to the management of intraoperative anesthesia. The long-term lateral position causes skin pressure trauma. If the lateral position is tilted forward or backward during the operation, it will affect the acetabulum. The judgment of lateral anteversion affects the correct installation of the acetabular prosthesis.

Application examples of postural adjustment systems in direct anterior approach total hip arthroplasty:

(1) Preoperative preparation: general anesthesia combined with lumbar plexus block anesthesia, the patient is placed in the supine position, and the body position adjustment system is placed just below the sacroiliac joint and the proximal femur. Raise the end of the bed by 30°, disinfect and lay towels.

(2) Make an 8-10cm incision parallel to the line connecting the anterior superior iliac spine and the lateral border of the patella (line A) on the patient’s affected side 3cm outwards (line B). Line C is the line B. Schematic representation of the Bikini incision with the center parallel to the inguinal dermis. The skin and subcutaneous fat were incised, the deep fascia was opened longitudinally, the space between the tensor fascia lata, sartorius and rectus femoris was bluntly separated, the branches of the external circumflex femoral artery were cut off and ligated, and the superficial fat of the joint capsule was removed. Separate and open the joint capsule and the gap to the gluteus minor and medius muscles, retract the gluteus minor and medius muscles outward, and separate the medial longitudinally along the lateral border of the rectus femoris to expose the medial and inferior parts of the joint capsule.

The joint capsule was cut in a "T" or "oblique L" shape along the labrum and the base of the femoral neck to expose the structure of the femoral head and neck. Inflate the acetabular side air bag to raise the acetabulum to an appropriate height, fully expose the acetabulum with the help of the acetabular retractor, release the joint capsules on the medial and inferior and lateral superior sides properly, and pay attention to protect the stop of the external rotator muscle group. Click complete.

The acetabular reamer was used to polish the acetabulum until the subchondral bone seeped blood oozing. The angle of abduction was 42° and the anteversion angle was 12°. A suitable size of acetabulum and lining were installed. Completely deflate the airbag under the acetabulum, inflate the airbag below the proximal femur to raise the osteotomy surface of the proximal femur to a suitable height, fully expose the femoral end, lower the end of the operating bed about 30°-45° to extend the affected limb backward, and The lower limbs were retracted and externally rotated, and the surrounding soft tissue was retracted with the aid of a large trochanter retractor to properly lift the proximal femur to expose the osteotomy surface. From small to large, the femoral stem bone canal was punched out with a rasp, and the femoral stem prosthesis was installed.

Install the femoral head and reset. The deep fascia, subcutaneous tissue and intradermal wound were sutured layer by layer.

Postoperative radiographs showed that the prosthesis was installed in a good position, and there were no complications such as proximal tibia fracture and prosthesis piercing through the femoral cortex, and both lower extremities were of equal length.

Since the development of this technology, our hospital has used the above method to perform minimally invasive total hip arthroplasty through direct anterior approach, and clinically treated more than 500 patients with hip joint diseases. Good hip function was obtained after all.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, Any simple modifications, equivalent replacements and improvements made in the above embodiments still fall within the protection scope of the technical solutions of the present invention.

Claims (7)

1. a postural adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty, is characterized in that: comprise intelligent digital air pressure pump power device and postural air bag device, described postural air bag device and intelligent digital air pressure pump The power devices are connected by an air pressure transmission line, and the body position airbag device is inflated or deflated by controlling the intelligent digital air pressure pump power device; the body position airbag device includes an airbag switcher and an air cushion, wherein the air cushion is divided into two types, namely The acetabular side sacroiliac joint adjusts the air cushion and the femur proximal end adjusts the air cushion; the air bag switch is arranged between the intelligent digital air pressure pump power device and the position air bag device, and the air bag switch is connected to each independent air cushion in the position air bag device. Different air bags need to be inflated or deflated according to the surgical side and the position that needs to be raised or lowered during the operation. 2. The body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty according to claim 1, wherein the acetabular side sacroiliac joint air cushion comprises a left sacroiliac joint air cushion , Right sacroiliac joint air cushion, the left sacroiliac joint air cushion is placed under the left sacroiliac joint during the operation, and the right sacroiliac joint air cushion is placed under the right sacroiliac joint during the operation. 3. The body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty according to claim 2, characterized in that: the proximal femur adjustment air cushion comprises a left proximal femoral air cushion, a right The air cushion at the proximal end of the femur, the air cushion at the proximal end of the left femur is placed under the proximal end of the left femur during the operation, and the air cushion at the proximal end of the right femur is placed under the proximal end of the right femur during the operation. 4. The body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty according to claim 3, characterized in that: the left sacroiliac joint air cushion is a larger air bag, and the left The lateral proximal femoral air cushion is a smaller air sac adjacent to the left sacroiliac joint air cushion. 5. The body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty according to claim 3, characterized in that: the right sacroiliac joint air cushion is a larger air bag, and the right sacroiliac joint air cushion is a larger air bag, and the right The lateral proximal femoral air cushion is a smaller air sac adjacent to the right sacroiliac joint air cushion. 6. The body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty according to claim 1, characterized in that: the intelligent digital air pressure pump power device is provided with an air pressure adjustment knob and an air bag switch Knob, the air pressure adjustment knob is used to control inflation or deflation, and the airbag switching knob is used to control the airbag switcher to switch inflation or deflation of the airbag. 7. The body position adjustment system applied in direct anterior approach minimally invasive total hip arthroplasty according to claim 6, characterized in that: the intelligent digital air pump power device is provided with a liquid crystal display, the The LCD display is used to display the current air bag and air pressure status.

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