A positioning assistance device for intraspinal anesthesia under ultrasound guidance

Abstract

The present invention discloses a positioning assistance device for intraspinal anesthesia under ultrasonic guidance, which includes a main body part for detachably mounting an ultrasonic probe and a needle guide sleeve detachably mounted on the main body part. When the ultrasonic probe or the needle guide sleeve is mounted on the main body part, the central axis of the main body part and the central axis of any one of them are on the same straight line, and the lower ends of the ultrasonic probe and the needle guide sleeve are exposed outside the main body part by the same length. Three foldable support feet are hinged on the outer side surface of the main body part, and a driving unit for driving the support feet to fold and unfold along the radial direction of the main body part is provided on the main body part. The structure of the present invention is compact and the operation is convenient, which is beneficial to improving the accuracy and safety of intraspinal anesthesia.

Description

Technical Field

[0001] The present invention relates to the field of medical auxiliary equipment, and particularly to a positioning auxiliary device for spinal anesthesia under ultrasound guidance. Background Art

[0002] Injecting anesthetic drugs into the subarachnoid space or epidural space of the spinal canal, and blocking the spinal nerve roots so that the corresponding areas innervated by the nerve roots produce anesthetic effects, are collectively referred to as spinal anesthesia. Spinal anesthesia is a commonly used anesthesia method for clinical lower abdomen and lower limb surgeries. Traditional spinal anesthesia determines the puncture point through anatomical positioning and determines whether the puncture catheter is in place based on the experience of anesthesiologists. Ultrasound can clearly display the spinal canal and its surrounding anatomical structures, making spinal anesthesia under ultrasound guidance more visual and precise, which is of great significance, especially for the elderly, obese patients, pregnant women, patients with lumbar degenerative diseases, patients with a history of previous lumbar surgery, and patients with anatomical abnormalities.

[0003] The existing operation method of spinal anesthesia usually requires a physician to determine the puncture interval and puncture point based on the ultrasound image combined with experience, and draw a line on the skin for marking (as shown in Figure 13 ), and then the anesthesiologist performs the puncture according to the above-mentioned marked line and experience. Since this type of anesthesia operation method requires multiple doctors to cooperate in sequence, it is easy to have errors in the connection process between the front and back operations, and has high requirements for the operation level of doctors and the cooperation level between doctors. At the same time, there may be deviations in the accuracy of the marking line and the anesthesiologist's understanding of the puncture angle of the anesthesia needle even when the ultrasound image is judged correctly, thus affecting the accuracy of spinal anesthesia under ultrasound guidance.

[0004] The invention patent with the application number 202111090546.7 discloses a positioning scanning system for spinal anesthesia under ultrasound guidance, including an ultrasound probe, a needle guide for guiding the insertion of the anesthetic needle tube; a first laser locator fixedly installed on the ultrasound probe; a second laser locator for installing on the needle guide; and a positioning patch for applying on the back. This invention can achieve the positioning of angles and directions in three-dimensional space through the projection rays of multiple rays on a plane, thus facilitating anesthesiologists to determine the puncture direction and puncture point according to the determined coordinate system, and avoiding the problem of inaccurate puncture methods caused by misjudgment of anesthesiologists. However, since this invention uses the method of irradiating point marking and positioning with laser rays, it has high requirements for the stability of the operator's hand-held operation during secondary alignment and positioning, and the position state of the device after alignment is unstable, resulting in deviations in the positions of the ultrasound probe and the anesthesia needle during the two alignments before and after, and thus affecting the accuracy of spinal anesthesia to a certain extent.

[0005] The invention patent with the application number 202010739952.0 discloses an adjustable anesthesia-assisted positioning puncture device for ultrasonic anesthesia, which includes an anesthesia adjustable fixing module, a one-way limiting mechanism module, and a multi-angle assisted positioning injection module. The upper part of the adjustable anesthesia-assisted positioning puncture device is fixedly connected to the existing ultrasonic probe through the anesthesia adjustable fixing module, and the lower part is in direct contact with the skin. The one-way limiting mechanism module is used for positioning. Then, the puncture needle is inserted into the multi-angle assisted positioning injection module, and the puncture needle slides down along the puncture path through the multi-angle assisted positioning injection module to the skin surface, and then punctures downward to complete the anesthesia. During the secondary positioning process of the invention, the puncture angle of the puncture needle is restricted by the multi-angle puncture frame, resulting in limitations in use. Moreover, the selection of the puncture angle on the multi-angle puncture frame is affected by the anesthesiologist's experience in interpreting ultrasonic images, which is prone to deviation. Summary of the Invention

[0006] The purpose of the present invention is to provide a positioning assistance device for spinal anesthesia under ultrasonic guidance, which improves the operation convenience and accuracy.

[0007] The technical solution adopted by the present invention to solve the above problems is as follows:

[0008] A positioning assistance device for spinal anesthesia under ultrasonic guidance includes a main body part that can be used for the detachable installation of an ultrasonic probe and a needle guide sleeve that can be detachably installed on the main body part. The needle guide sleeve is used to guide the anesthesia needle to move linearly along the central axis of the needle guide sleeve. When the ultrasonic probe or the needle guide sleeve is installed on the main body part, the central axis of the main body part is on the same straight line as the central axis of any one of them, and the lower ends of the ultrasonic probe and the needle guide sleeve are exposed outside the main body part by the same length. Three foldable support feet are hinged on the outer side surface of the main body part, and a driving unit for driving the support feet to fold in and expand along the radial direction of the main body part is provided on the main body part. The three support feet are simultaneously expanded, and at most two of them have the same expansion stroke.

[0009] As a further improvement of the above technical solution, the support feet include a first movable rod and a second movable rod. The lengths of the first movable rods among the three support feet are the same, and at most two of the second movable rods among the three support feet have the same length. One end of the first movable rod is hinged to the outer side surface of the main body member. The other end of the first movable rod is hinged to one end of the second movable rod. The other end of the second movable rod is connected with a support block through a ball head connection mechanism. A pressure sensor is installed at the central position of the bottom surface of the support block. By using the pressure sensor, when the support block contacts the skin, the pressure signal detected and fed back by the pressure sensor can be used to control the driving unit to stop driving the support feet. That is, when the pressure value detected by the pressure sensor exceeds the preset value, the driving unit stops operating, thus ensuring the convenience of adjusting the position of the three support feet against, and avoiding the obstruction to the position adjustment of the support feet caused by excessive deployment of the support feet. There are marks on the outer side surface of the main body member for distinguishing the three support feet.

[0010] As a further improvement of the above technical solution, the driving unit includes a second driving motor, a first slider, a first connecting rod, a second connecting rod and a second slider. The second driving motor is installed on the outer side surface of the main body member. The first slider is slidably arranged on the outer side surface of the main body member. The second driving motor is used to drive the first slider to move vertically in a straight line. The middle position of the first movable rod and the first slider are connected through the first connecting rod. The two ends of the first connecting rod are respectively hinged to the first slider and the first movable rod. The middle position of the second movable rod and the second slider are connected through the second connecting rod. The two ends of the second connecting rod are respectively hinged to the second slider and the second movable rod. The second slider is slidably connected to the first movable rod. A tension spring is arranged between the other end of the first movable rod and the second slider. The two ends of the tension spring are respectively fixed to the other end of the first movable rod and the second slider. A limiting block is arranged on the outer side surface of the main body member. One end of the limiting block is integrally connected to the outer side surface of the main body member. The other end of the limiting block is located on the rotation stroke of the first movable rod. When the support feet are not deployed, the other end of the limiting block abuts against the second slider. Any one or two of the side surfaces that abut against each other between the limiting block and the second slider are arc-shaped.

[0011] During use, the first slider is driven vertically downward by the second drive motor, so that the first slider drives the other end of the first movable rod to rotate about the hinge position between the first movable rod and the main body via the first connecting rod, thereby gradually expanding the angle between the first movable rod and the main body. When the angle between the first movable rod and the main body reaches a specific angle, the second slider disengages from the limit block, and the lock between the first movable rod and the second movable rod is released. As the first slider continues to move vertically downward, the second slider moves linearly from one end of the first movable rod to the other end thereof under the action of the tension spring, so that the second slider drives the other end of the second movable rod to rotate about the hinge position between the second movable rod and the first movable rod via the second connecting rod, thereby gradually expanding the angle between the first movable rod and the second movable rod to its maximum value.

[0012] As a further improvement of the above technical solution, the main body includes a support sleeve, a fixing sleeve for fixing the ultrasonic probe, and a handle member. The fixing sleeve is rotatably arranged in the hollow space of the support sleeve. A driving module for driving the fixing sleeve to rotate relative to the support sleeve is installed on the support sleeve. The lower end of the handle member is connected to the upper end of the fixing sleeve by a thread. A guide channel is provided on the handle member, which passes through the handle member along the axial direction of the handle member. The guide channel is connected to the hollow space of the fixing sleeve. The guide channel is used to guide the cable of the ultrasonic probe or the needle tube of the anesthesia needle to pass through. The upper end of the handle member is exposed outside the upper end of the support sleeve. A number of convex rings arranged at equal intervals are provided on the upper end of the handle member, which is beneficial to improving the user's hand-holding effect of the device.

[0013] As a further improvement to the above technical solution, the drive module includes a first drive motor and a gear transmission mechanism. The first drive motor is mounted on the support sleeve. The first drive motor and the fixed sleeve are connected to each other via the gear transmission mechanism. The gear transmission mechanism includes a gear and an outer ring gear. The gear is fixed to the output shaft of the first drive motor. The outer ring gear meshes with the gear. The outer ring gear is mounted on and fixed to the fixed sleeve. The first drive motor drives the fixed sleeve to rotate. When the handle is held to keep the fixed sleeve stationary, the support sleeve can rotate relative to the fixed sleeve, thereby adjusting the position of the three support legs on the support sleeve so that the extended length of the three support legs can meet the requirements of supporting the main body.

[0014] As a further improvement of the above technical solution, grooves for respectively accommodating the two protrusions on the ultrasonic probe are provided at two opposite positions on the inner wall surface of the fixing sleeve, which is beneficial to ensure the stability of the ultrasonic probe fixed on the fixing sleeve and avoids the rotation and displacement of the ultrasonic probe on the fixing sleeve.

[0015] As a further improvement of the above technical solution, the guide needle sleeve is conical, and several guiding pieces arranged at equal angles around the central axis of the guide needle sleeve are integrally connected inside the hollow space of the guide needle sleeve. A guide needle channel for the needle tube of the anesthesia needle to pass through is formed between the guiding pieces, which is conducive to improving the fixing effect of the anesthesia needle on the device, thereby ensuring the accuracy of the anesthesia needle puncture.

[0016] As a further improvement of the above technical solution, a guide needle seat is arranged inside the hollow space of the guide needle sleeve. The needle tip of the anesthesia needle can be inserted on the guide needle seat, and the tip of the needle can pass through the guide needle seat and be exposed outside the lower end of the guide needle sleeve, which is conducive to ensuring the fixing strength of the anesthesia needle on the device, thereby ensuring the accuracy of the puncture.

[0017] As a further improvement of the above technical solution, a limiting piece is arranged along the upper edge of the other end of the first movable rod. The limiting piece is L-shaped and includes a horizontal section and a vertical section. The horizontal section is located on the stroke where the second movable rod rotates outward relative to the first movable rod, and the vertical section is located on the stroke where the second movable rod rotates inward relative to the first movable rod, which is conducive to avoiding the situation that the support feet are over-expanded or folded.

[0018] Compared with the prior art, the present invention has the following advantages and effects:

[0019] The present invention can realize the positioning of the puncture angle and direction of the anesthesia needle after the anesthesia needle is installed on the device through the positions of the three support feet of the ultrasonic probe at the optimal puncture angle on the skin, which is conducive to improving the accuracy and success rate of the puncture, thereby reducing puncture-related complications and improving the safety, comfort and satisfaction of patients.

[0020] At the same time, the present invention realizes the precise positioning of the anesthesia needle puncture through the main body part and the three support frames thereon, with a compact structure and ensuring the stability of the device positioning effect, thereby avoiding the situation of errors in the re-positioning and use of the device after the ultrasonic probe and the anesthesia needle on the device are replaced, which is conducive to ensuring the use effect of the device.

[0021] Furthermore, the operation steps of the present invention are simple, reducing the requirements of the device for the operator's operation level, facilitating the operator to quickly achieve accurate intraspinal anesthesia operation, being conducive to popularization and avoiding the deviation existing in the operation connection between physicians, thereby ensuring the operation quality of intraspinal anesthesia. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a positioning assistance device for ultrasonic-guided intraspinal anesthesia of the present invention.

[0023] Figure 2 is a schematic structural diagram of the present invention after installing the ultrasonic probe.

[0024] Figure 3 It is a schematic side view of the structure of the present invention after installing an ultrasonic probe.

[0025] Figure 4 It is a schematic cross-sectional view of the structure of the present invention after installing an ultrasonic probe.

[0026] Figure 5 It is a schematic cross-sectional view of the structure of the present invention after installing an anesthetic needle.

[0027] Figure 6 is Figure 1 a schematic bottom view of the structure of the fixing sleeve shown in

[0028] Figure 7 is Figure 1 a schematic view of the structure of the support leg shown in

[0029] Figure 8 is Figure 1 a schematic view of the structure of the drive module shown in

[0030] Figure 9 It is a schematic operation diagram when the present invention is actually used.

[0031] Figure 10 It is a schematic view of the structure of the present invention in the first usage state.

[0032] Figure 11 It is a schematic view of the structure of the present invention in the second usage state.

[0033] Figure 12 It is a schematic view of the structure of the present invention in the third usage state.

[0034] Figure 13 It is a schematic operation diagram of traditional intraspinal anesthesia.

[0035] Among them, the main body member 1, the support sleeve 11, the fixing sleeve 12, the handle member 13, the guiding channel 14, the convex ring 15, the groove 16, the needle guide sleeve 2, the guiding piece 21, the needle guide channel 22, the needle guide seat 23, the support leg 3, the first movable rod 31, the second movable rod 32, the ball head connecting mechanism 33, the support block 34, the mark 35, the limiting piece 36, the horizontal section 37, the vertical section 38, the driving unit 4, the second driving motor 41, the first slider 42, the first connecting rod 43, the second connecting rod 44, the second slider 45, the tension spring 46, the limiting block 47, the arc-shaped 48, the driving module 5, the first driving motor 51, the gear transmission mechanism 52, the gear 53, the external gear ring 54, the ultrasonic probe 6, the convex block 61, and the anesthetic needle 7. Specific Embodiments

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention and the present invention is not limited to the following embodiments.

[0037] The present invention aims to address the problems in existing ultrasound-guided spinal anesthesia operation methods, which are that the puncture point can only be marked by drawing a line on the skin based on experience, but the puncture angle and puncture direction of the anesthetic needle cannot be positioned, and that even when the ultrasound image is correct, the accuracy of the drawing and the anesthesiologist's understanding of the puncture angle of the anesthetic needle may be biased, thereby affecting the accuracy of the ultrasound-guided spinal anesthesia operation. The present invention provides an ultrasound-guided spinal anesthesia positioning auxiliary device.

[0038] See also Figures 1-5 , this embodiment is a positioning auxiliary device for intrathecal anesthesia under ultrasound guidance, including a main body 1 that can be used for detachable installation of an ultrasound probe 6 and a guide needle sleeve 2 that can be detachably installed on the main body 1, the guide needle sleeve 2 is used to guide the anesthesia needle 7 to move linearly along the central axis of the guide needle sleeve 2, when the ultrasound probe 6 or the guide needle sleeve 2 is installed on the main body 1, the central axis of the main body 1 and the central axis of any one of the two are on the same straight line and the lower ends of the ultrasound probe 6 and the guide needle sleeve 2 are exposed outside the main body 1 by the same length, three foldable supporting legs 3 are hinged on the outer surface of the main body 1, and a driving unit 4 is provided on the main body 1 for driving the supporting legs 3 to retract and unfold along the radial direction of the main body 1, and the three supporting legs 3 are unfolded simultaneously, of which two supporting legs 3 have the same unfolding stroke, and the unfolding stroke of the remaining supporting leg 3 is different from the unfolding stroke of the aforementioned two supporting legs 3.

[0039] See also Figures 3-5 The main body 1 includes a support sleeve 11, a fixing sleeve 12 for fixing the ultrasonic probe 6, and a handle member 13. The fixing sleeve 12 is rotatably arranged in the hollow space of the support sleeve 11. The support sleeve 11 is provided with a driving module 5 for driving the fixing sleeve 12 to rotate relative to the support sleeve 11. The lower end of the handle member 13 is connected to the upper end of the fixing sleeve 12 by a thread. The handle member 13 is provided with a guide channel 14 that penetrates the handle member 13 along the axial direction of the handle member 13. The guide channel 14 is connected to the hollow space of the fixing sleeve 12. The guide channel 14 is used to guide the cable of the ultrasonic probe 6 or the needle tube of the anesthesia needle 7 to pass through. The upper end of the handle member 13 is exposed outside the upper end of the support sleeve 11, and the upper end of the handle member 13 is provided with a plurality of convex rings 15 arranged at equal intervals.

[0040] See also Figure 5The guide needle sleeve 2 is tapered, with several guide pieces 21 integrally connected to its hollow space. These guide pieces 21 are arranged at equal angles around the central axis of the guide needle sleeve 2. A guide needle channel 22 is formed between the guide pieces 21, through which the needle tube of the anesthetic needle 7 passes. A guide needle seat 23 is provided within the hollow space of the guide needle sleeve 2. The needle tip of the anesthetic needle 7 can be inserted into the guide needle seat 23, with the needle tip passing through the guide needle seat 23 and exposed at the lower end of the guide needle sleeve 2. In this embodiment, the guide needle sleeve 2 can be mounted to the opening at the lower end of the support sleeve 11 using an interference fit or a threaded connection.

[0041] See also Figure 6 The fixing sleeve 12 has two opposite positions on its inner wall, each of which is provided with grooves 16 for respectively accommodating the two protrusions 61 on the ultrasonic probe 6. In this embodiment, the ultrasonic probe 6 can be fixed to the fixing sleeve 12 using a buckle structure.

[0042] See also Figure 7 The supporting foot 3 includes a first movable rod 31 and a second movable rod 32. The lengths of the first movable rods 31 in the three supporting feet 3 are the same. The lengths of two of the second movable rods 32 in the three supporting feet 3 are the same, and the length of the remaining second movable rod 32 is different from the lengths of the two second movable rods 32 mentioned above. One end of the first movable rod 31 is hinged to the outer surface of the main body 1, and the other end of the first movable rod 31 is hinged to one end of the second movable rod 32. During use, in order to reduce the degree of skin depression caused by the supporting foot against the skin, the other end of the second movable rod 32 is connected to the supporting block 34 through a ball head connection mechanism 33. A pressure sensor is installed at the center position of the bottom surface of the supporting block 34. A mark 35 for distinguishing the three supporting feet 3 is provided on the outer surface of the main body 1. In this embodiment, the mark 35 uses letter symbols A, B, and C.

[0043] See also Figure 7 A limiting piece 36 is provided on the upper edge of the first movable rod 31 along the other end of the first movable rod 31. The limiting piece 36 is integrally connected to the first movable rod 31. The limiting piece 36 is L-shaped. The limiting piece 36 includes a transverse section 37 and a longitudinal section 38. The transverse section 37 is located on the stroke of the second movable rod 32 rotating outward relative to the first movable rod 31, and the longitudinal section 38 is located on the stroke of the second movable rod 32 rotating inward relative to the first movable rod 31.

[0044] See also Figure 7The driving unit 4 includes a second driving motor 41, a first slider 42, a first connecting rod 43, a second connecting rod 44 and a second slider 45. The second driving motor 41 is installed on the outer surface of the main body 1, and the first slider 42 is slidably arranged on the outer surface of the main body 1. The second driving motor 41 is used to drive the first slider 42 to move vertically and linearly. In this embodiment, the second driving motor 41 is a screw motor, and the first slider 42 is sleeved on the output shaft of the screw motor in a threaded manner. The middle position of the first movable rod 31 and the first slider 42 are connected by the first connecting rod 43. The two ends of the first connecting rod 43 are respectively hinged on the first slider 42 and the first movable rod 31. The middle position of the second movable rod 32 and the second slider 4 5 are connected by a second connecting rod 44, both ends of the second connecting rod 44 are hinged to the second slider 45 and the second movable rod 32 respectively, the second slider 45 is slidably connected to the first movable rod 31, a tension spring 46 is provided between the other end of the first movable rod 31 and the second slider 45, the two ends of the tension spring 46 are fixed to the other end of the first movable rod 31 and the second slider 45 respectively, a limit block 47 is provided on the outer surface of the main body 1, one end of the limit block 47 is integrally connected to the outer surface of the main body 1, and the other end of the limit block 47 is located on the rotation stroke of the first movable rod 31. When the supporting leg 3 is not unfolded, the other end of the limit block 47 abuts against the second slider 45, and the side surfaces abutting between the limit block 47 and the second slider 45 are both curved 48.

[0045] See also Figure 8 The drive module 5 includes a first drive motor 51 and a gear transmission mechanism 52. The first drive motor 51 is installed on the support sleeve 11. The first drive motor 51 and the fixed sleeve 12 are connected to each other through the gear transmission mechanism 52. The gear transmission mechanism 52 includes a gear 53 and an outer ring gear 54. The gear 53 is fixed on the output shaft of the first drive motor 51. The outer ring gear 54 is engaged with the gear 53. The outer ring gear 54 is sleeved and fixed on the fixed sleeve 12.

[0046] In summary, the method of use of the present invention is as follows:

[0047] Step 1: Install the ultrasound probe on the main body, then move the ultrasound probe and change the angle of the ultrasound probe until the ultrasound image meets the requirements of the puncture gap, puncture point and puncture angle. At this time, the central axis of the ultrasound probe is the puncture angle, and the midpoint of the lower end of the ultrasound probe is the puncture point;

[0048] Step 2: The driving module drives the support sleeve to rotate relative to the fixed sleeve, thereby realizing the rotation of the three support legs relative to the ultrasound probe, so that the three support legs can be adjusted according to the tilt angle and tilt direction of the ultrasound probe, that is, the unfolded length of the three support legs can meet the requirements of three-point support and fixation of the ultrasound probe, such as Figure 9 As shown;

[0049] Step 3: Drive the three support feet to deploy in stages through three drive units;

[0050] (1) When the first slider is driven to move vertically downward by the second drive motor, the other end of the first movable rod is driven by the first connecting rod to rotate around the hinge position between the first movable rod and the main body, so that the angle between the first movable rod and the main body gradually expands, as Figure 10 、 Figure 11 shown;

[0051] (2) When the angle between the first movable rod and the main body reaches a specific angle, the second slider and the limit block are disengaged. At this time, the locked state between the first movable rod and the second movable rod is released. The second slider moves linearly from one end of the first movable rod to the other end under the action of the tension spring, so that the second slider drives the other end of the second movable rod to rotate around the hinge position between the second movable rod and the first movable rod through the second connecting rod, so that the angle between the first movable rod and the second movable rod gradually expands to the maximum. At this time, the first movable rod and the second movable rod are fully deployed, and the tension spring is in an un-stretched state, as Figure 11 shown;

[0052] (3) During the process of the first slider continuing to move vertically downward, the angle between the first movable rod and the main body continues to gradually expand, as Figure 11 、 Figure 12 shown, until the bottom surface of the support block is in full contact with the skin. At this time, the drive unit stops driving;

[0053] Step 4: Mark different symbols, such as numerical symbols (1, 2, 3), letter symbols (A, B, C), etc., on the positions where the three support feet of the main body touch the skin according to the marks of the three support feet on the main body, as Figure 9 shown. Due to the movement restriction of the second drive motor on the first slider and the movement restriction of the tension spring on the second slider, the support feet can remain unchanged after deployment. Therefore, by corresponding and cooperating with the positions marked by the three symbols and the three unchanged support feet, it can ensure that the anesthesia needle installed on the subsequent main body can maintain the same tilt angle and tilt direction as the ultrasonic probe;

[0054] Step 5: Remove the ultrasonic probe from the main body and install a guide needle sleeve and an anesthesia needle. Then, make the three support feet contact the corresponding symbol marked positions again. When the anesthesia needle is linearly pushed along the axis of the main body, the tip of the anesthesia needle can penetrate from the puncture point and puncture angle determined by the ultrasonic probe, thereby reducing the error between the actual operation of the anesthesia needle and the ultrasonic image judgment.

[0055] The above content described in this specification is only an illustration of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the specific embodiments described or use similar ways for substitution, as long as they do not deviate from the content of this specification of the present invention or exceed the scope defined by this claims, they shall fall within the protection scope of the present invention.

Claims

1. A positioning assistance device for intraspinal anesthesia under ultrasound guidance, characterized in that: The invention comprises a main body that can be used for detachable installation of an ultrasound probe and a guide needle sleeve that can be detachably installed on the main body. The guide needle sleeve is used to guide the anesthesia needle to move linearly along the central axis of the guide needle sleeve. When the ultrasound probe or the guide needle sleeve is installed on the main body, the central axis of the main body and the central axis of either of them are on the same straight line, and the lower ends of the ultrasound probe and the guide needle sleeve are exposed outside the main body by the same length. Three foldable support legs are hinged on the outer surface of the main body. The main body is provided with a driving unit for driving the support legs to retract and unfold along the radial direction of the main body. The three support legs are unfolded simultaneously, and at most two of the three support legs have the same unfolding stroke. Wherein, the supporting legs include a first movable rod and a second movable rod, the lengths of the first movable rods of the three supporting legs are the same and the lengths of at most two second movable rods of the three supporting legs are the same, one end of the first movable rod is hinged to the outer surface of the main body, the other end of the first movable rod is hinged to one end of the second movable rod, the other end of the second movable rod is connected to the supporting block via a ball head connection mechanism, a pressure sensor is installed at the center position of the bottom surface of the supporting block, and a mark for distinguishing the three supporting legs is provided on the outer surface of the main body; The main body comprises a support sleeve, a fixing sleeve for fixing the ultrasound probe, and a handle member, wherein the fixing sleeve is rotatably arranged in the hollow space of the support sleeve, and a driving module for driving the fixing sleeve to rotate relative to the support sleeve is installed on the support sleeve. The lower end of the handle member is connected to the upper end of the fixing sleeve by a thread, and a guide channel is provided on the handle member, which passes through the handle member along the axial direction of the handle member, and the guide channel is connected to the hollow space of the fixing sleeve. The guide channel is used to guide the cable of the ultrasound probe or the needle tube of the anesthesia needle to pass through. The upper end of the handle member is exposed outside the upper end of the support sleeve, and the upper end of the handle member is provided with a plurality of convex rings arranged at equal intervals; The drive module includes a first drive motor and a gear transmission mechanism. The first drive motor is installed on the support sleeve. The first drive motor and the fixed sleeve are connected through the gear transmission mechanism. The gear transmission mechanism includes a gear and an outer ring gear. The gear is fixed on the output shaft of the first drive motor. The outer ring gear is engaged with the gear, and the outer ring gear is sleeved and fixed on the fixed sleeve.

2. The positioning assistance device for intraspinal anesthesia under ultrasonic guidance according to claim 1, characterized in that: The driving unit includes a second driving motor, a first slider, a first connecting rod, a second connecting rod and a second slider. The second driving motor is installed on the outer side surface of the main body. The first slider is slidably arranged on the outer side surface of the main body. The second driving motor is used to drive the first slider to move vertically in a straight line. The middle position of the first movable rod is connected to the first slider through the first connecting rod. The two ends of the first connecting rod are respectively hinged to the first slider and the first movable rod. The middle position of the second movable rod is connected to the second slider through the second connecting rod. The two ends of the second connecting rod are respectively hinged to the second slider and the second movable rod. The second slider is slidably connected to the first movable rod. A tension spring is arranged between the other end of the first movable rod and the second slider. The two ends of the tension spring are respectively fixed to the other end of the first movable rod and the second slider. A limiting block is arranged on the outer side surface of the main body. One end of the limiting block is integrally connected to the outer side surface of the main body. The other end of the limiting block is located on the rotation stroke of the first movable rod. When the support feet are not unfolded, the other end of the limiting block abuts against the second slider. Any one or both of the side surfaces that abut between the limiting block and the second slider are arc-shaped.

3. The positioning assistance device for intraspinal anesthesia under ultrasonic guidance according to claim 1, wherein: Grooves for respectively accommodating two bumps on the ultrasonic probe are formed at two opposite positions on the inner wall surface of the fixed sleeve.

4. The positioning assistance device for intraspinal anesthesia under ultrasonic guidance according to claim 1, wherein: The needle guide sleeve is conical. A plurality of guiding pieces arranged at equal angles around the central axis of the needle guide sleeve are integrally connected in the hollow space of the needle guide sleeve. A needle guide channel for the needle tube of the anesthetic needle to pass through is formed between the guiding pieces.

5. The positioning assistance device for intraspinal anesthesia under ultrasonic guidance according to claim 1, characterized in that: A needle guide seat is arranged in the hollow space of the needle guide sleeve. The needle tip of the anesthetic needle can be inserted into the needle guide seat, and the tip of the needle can pass through the needle guide seat and be exposed outside the lower end of the needle guide sleeve.

6. The positioning assistance device for intraspinal anesthesia under ultrasonic guidance according to claim 1, characterized in that: A limiting piece is arranged along the upper edge of the other end of the first movable rod. The limiting piece is L-shaped and includes a horizontal section and a vertical section. The horizontal section is located on the outward rotation stroke of the second movable rod relative to the first movable rod, and the vertical section is located on the inward rotation stroke of the second movable rod relative to the first movable rod.

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