Spinal erector muscle surface block needle guide device for postoperative pain relief

Abstract

To improve the accuracy of puncture and the success rate of the procedure in ultrasound-guided erector spinae muscle block. [Solution] The spinal erector muscle surface block puncture needle guide device for postoperative pain relief comprises a base 1 having a housing space for an ultrasound probe and an acoustic perforation hole at the bottom; a needle path guide mechanism 4 including a guide tube 5 rotatably connected to the base 1; an angle adjustment mechanism 7 for adjusting and locking the angle of the guide tube 5 relative to the base 1; and a depth limiting mechanism 10 adjustablely provided in the lumen of the guide tube 5 to limit the maximum insertion depth of the puncture needle. Under ultrasound guidance, it provides stable needle path guidance and precise angle and depth control to the puncture needle, allowing the puncture needle to accurately reach the target gap between the deep surface and transverse process of the spinal erector muscle, improving puncture accuracy and operational success rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and specifically relates to a spinal erector muscle plane block puncture needle guiding device for postoperative analgesia.

Background Art

[0002] Ultrasound-guided spinal erector muscle plane block is a regional anesthesia technique widely applied to postoperative analgesia for thoracic, dorsal, and upper abdominal surgeries. By injecting a local anesthetic into the space between the deep surface of the spinal erector muscle and the transverse process, it achieves the block of the posterior and anterior branches of the thoracic nerves and obtains a good analgesic effect. Taking lung surgery as an example, although video-assisted thoracoscopic lobectomy has less trauma compared to conventional open thoracotomy, the problem of postoperative acute pain has not been completely solved yet, and in some patients, it may even develop into chronic pain. Postoperative acute pain induces excessive excitement of the sympathetic nerves, increases the risk of cardiovascular accidents, causes complications such as pneumonia and atelectasis, may prolong the hospital stay, and delay the patient's recovery process.

[0003] Multimodal analgesia is an analgesic method that synergistically enhances the analgesic effect and reduces the side effects of a single analgesic by combining analgesics with different mechanisms of action (such as opioid-biased μ receptor agonists like tapentadol and orphenadrine), and it has now become one of the mainstream analgesic methods. And spinal erector muscle plane block, as an important regional anesthesia technique in the multimodal analgesia regimen, the accuracy of its operation directly affects the nerve block effect, and thus affects the overall implementation quality of the analgesia regimen. In actual operation, the key to this block technique lies in the accurate arrival of the puncture needle at the target space between the deep surface of the spinal erector muscle and the transverse process. However, this space is narrow, and since the conventional puncture operation mainly depends on the stability of the operator's hand and real-time guidance by ultrasound images, it is difficult to accurately control the angle and penetration depth of the puncture needle, and puncture deviation is likely to occur, resulting in inaccurate injection of the local anesthetic into the target space, affecting the block effect, and in severe cases, even necessitating repeated punctures or a change to another analgesic method.

[0004] Therefore, improving the accuracy of puncture and the success rate of ultrasound-guided erector spinae muscle block is a technical challenge that needs to be addressed in current clinical practice. [Overview of the project] [Problems that the invention aims to solve]

[0005] This invention provides a spinal erector muscle surface block puncture needle guide device for postoperative pain relief. Under ultrasound guidance, it provides stable trajectory guidance and precise angle adjustment for the puncture needle, enabling the puncture needle to accurately reach the target space between the deep surface and transverse process of the spinal erector muscle, thereby improving the accuracy and success rate of nerve block procedures. [Means for solving the problem]

[0006] The technical means employed in this invention are as follows:

[0007] A spinal erector muscle surface block puncture needle guide device for postoperative pain relief, comprising: a base having a housing space for positioning an ultrasound probe and having an acoustically transparent hole at the bottom for the detection surface of the ultrasound probe to pass through; and a guide tube for passing a puncture needle and providing a guide path for the puncture needle, wherein the guide tube includes a connecting portion and a flexible tube portion connected to the connecting portion, and the connecting portion is connected to the base; an angle adjustment mechanism provided on the base and connected to the guide tube for adjusting and locking the angle of the guide tube with respect to the base; and a depth limiting mechanism provided in the lumen of the guide tube.

[0008] The angle adjustment mechanism includes an adjustment plate fixed on the base and having an arc-shaped, elongated adjustment groove, the curvature of which matches the motion trajectory traced by the fixed sleeve when the flexible tube portion of the guide tube rotates; a fixed sleeve fitted onto the outer wall of the guide tube; and an adjustment screw that passes through the adjustment groove and screws into the fixed sleeve.

[0009] The depth limiting mechanism includes a limiting ring provided in the lumen of the guide tube, having a central through-hole through which the needle shaft of the puncture needle passes, and whose outer wall is screwed with the inner wall of the guide tube, and a limiting nut screwed into the lumen at the upper end of the guide tube, whose inner diameter is smaller than the outer diameter of the limiting ring, and whose lower end surface is located within the lumen of the guide tube, defining the maximum upward movement position of the limiting ring.

[0010] Anti-slip pads are provided on the four peripheral edges of the base of the aforementioned base, and these anti-slip pads are made of medical-grade silicone material and have anti-slip grooves on their bottoms. [Effects of the Invention]

[0011] This invention provides the following beneficial effects.

[0012] This invention, through the combined arrangement of a base and a needle path guide mechanism, provides the base with a stable housing space for the ultrasound probe, and the guide tube is rotatably connected to the base to provide a rigid path for the puncture needle. As a result, the operator can stably guide the puncture needle along the planned path to the target area under real-time guidance of ultrasound images, reducing puncture deviation due to the operator's hand tremors and improving the accuracy of spinal erector surface block. This provides a reliable foundation for performing regional nerve blocks in multifaceted analgesic regimens such as tyridine-assisted spinal erector surface block.

[0013] This invention utilizes a combination arrangement of an adjustment plate and an adjustment screw in an angle adjustment mechanism. The adjustment plate is provided with an arc-shaped, elongated adjustment groove, the curvature of which is aligned with the movement trajectory traced by the fixed sleeve when the flexible tube portion of the guide tube rotates, and the adjustment screw penetrates the adjustment groove and screws into the fixed sleeve fitted onto the outer wall of the guide tube. When the adjustment screw is loosened, the guide tube rotates within a range of 15° to 45° relative to the base, allowing it to be adjusted to target the gap between the deep surface and transverse process of the erector spinae muscle. When the adjustment screw is tightened, the angle of the guide tube is locked. This allows the puncture needle to enter the target area at the optimal angle, adapting to different patient body types and anatomical differences at the puncture site, and ensuring that the local anesthetic is accurately injected into the target gap to achieve effective block of the posterior and anterior branches of the thoracic nerves.

[0014] This invention utilizes a combination arrangement of a limiting ring and a limiting nut in a depth limiting mechanism. The limiting ring is positioned within the lumen of the guide tube and screwed into the inner wall of the guide tube, allowing its position to be adjusted vertically along the axial direction of the guide tube according to the required puncture depth. The limiting nut is screwed into the lumen at the upper end of the guide tube, defining the maximum upward movement of the limiting ring. When the base of the puncture needle contacts the upper surface of the limiting ring, the set maximum depth is reached. This prevents the puncture needle from penetrating too deeply and damaging surrounding tissue, reduces block failure or analgesia insufficiency due to puncture deviation, and contributes to improving the overall effectiveness of multifaceted postoperative analgesia in lung surgery patients. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a schematic diagram of the structure of the present invention. [Figure 2] Figure 2 is a schematic diagram of the structure after rotating Figure 1. [Figure 3] Figure 3 is a schematic diagram of a partial structure of the present invention. [Modes for carrying out the invention]

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0017] An embodiment of the present invention provides a spinal erector muscle surface block puncture needle guide device for postoperative pain relief. The device is applied during the process of ultrasound-guided spinal erector muscle surface block procedures and provides stable trajectory guidance and precise angle adjustment to the puncture needle, enabling the puncture needle to accurately reach the target space between the deep surface and transverse process of the spinal erector muscle.

[0018] Please refer to Figures 1 to 3. The device mainly comprises a base 1, a course guide mechanism 4, an angle adjustment mechanism 7, and a depth limiting mechanism 10. The specific structure of each mechanism will be described in detail below.

[0019] The base 1 is the support base for the entire device and includes a bottom plate 2 and side walls 3. The bottom plate 2 is rectangular and flat, and has one acoustic perforation hole in the center. The dimensions of the acoustic perforation hole match the dimensions of the detection surface of the ultrasound probe, so that when the ultrasound probe is placed in the housing space, its detection surface passes through the acoustic perforation hole and makes direct contact with the patient's skin surface, enabling ultrasonic acoustic coupling. There are two side walls 3, each located on the side edges of the top of the bottom plate 2, and a housing space for positioning the ultrasound probe is formed between the two side walls 3. A buffer layer is fixedly connected to the inner wall of the side walls 3 and is used for the protection and positioning of the ultrasound probe, preventing the ultrasound probe from wearing or sliding due to direct contact with the side walls 3.

[0020] The needle guiding mechanism 4 is used to provide stable guiding for the puncture needle and includes a guide tube 5 and a fixing sleeve 6. The guide tube 5 has a hollow cylindrical structure, and its inner wall is smooth to allow the puncture needle to pass through smoothly. The guide tube 5 includes a connecting part and a flexible tube part connected to the connecting part, and the connecting part is connected to the base plate 2. The rotation angle range of the flexible tube part in the guide tube 5 is from 15° to 45°, and the specific angle can be adjusted according to the patient's body type and puncture site. Multiple scale marks are provided on the inner wall of the guide tube 5, and these scale marks are evenly distributed along the axial direction of the guide tube 5 and are used to indicate the depth to which the puncture needle enters the guide tube 5, helping the operator to accurately control the insertion depth of the puncture needle. The fixing sleeve 6 is fitted onto the outer wall of the guide tube 5. Positioning marks are provided on the outer wall of the fixing sleeve 6, and these positioning marks are made of phosphorescent material to facilitate identification of the device position in dark environments.

[0021] The angle adjustment mechanism 7 is mounted on the base 1 and is used to adjust the angle of the guide tube 5 relative to the bottom plate 2. The angle adjustment mechanism 7 includes an adjustment plate 8 and an adjustment screw 9. The lower end of the adjustment plate 8 is fixedly connected to the top of the bottom plate 2, and a long, arc-shaped adjustment groove is provided in its center. The curvature of the adjustment groove matches the motion trajectory traced by the fixed sleeve 6 when the flexible tube portion of the guide tube 5 rotates. The adjustment screw 9 passes through the adjustment groove and is screwed into the fixed sleeve 6. When the flexible tube portion of the guide tube 5 rotates, the adjustment screw 9 slides along the arc direction of the adjustment groove. When the adjustment screw 9 is tightened, the fixed sleeve 6 is locked to the adjustment plate 8, thereby locking the flexible tube portion of the guide tube 5 at the selected angle. Angle scale lines are provided on the outer surface of the adjustment plate 8, parallel to the arc of the adjustment groove, and the scale range of the angle scale lines is from 15° to 45°, displaying the current angle value of the guide tube 5 and assisting the operator in accurately adjusting to the desired angle. An adjustment knob is provided on the head of the adjustment screw 9, making it convenient for the operator to rotate the adjustment screw 9 by pinching it with their fingers.

[0022] The depth limiting mechanism 10 is provided in the inner cavity of the guide tube 5 and is used to limit the maximum penetration depth of the puncture needle. The depth limiting mechanism 10 includes a limiting ring 11 and a limiting nut 12. The limiting ring 11 is provided in the inner cavity of the guide tube 5. Along the axial direction of the guide tube 5, the position of the limiting ring 11 is located above the guide tube section corresponding to the fixed sleeve 6. The limiting ring 11 is a ring-shaped member having a central through-hole. The aperture diameter of the central through-hole is larger than the outer diameter of the needle shaft of the puncture needle and smaller than the outer diameter of the needle base of the puncture needle. A male thread is provided on the outer wall of the limiting ring 11, and a female thread is provided at the corresponding position on the inner wall of the guide tube 5. The limiting ring 11 is screwed with the inner wall of the guide tube 5. The operator can insert an adjusting tool from the upper port of the guide tube 5 to rotate the limiting ring 11 and move the limiting ring 11 up and down along the axial direction of the guide tube 5, thereby adjusting the position of the limiting ring 11 in the guide tube 5. The limiting nut 12 is screwed into the inner cavity at the upper end of the guide tube 5, and the inner diameter of the limiting nut 12 is smaller than the outer diameter of the limiting ring 11. The limiting nut 12 functions as an auxiliary anti-drop member for the limiting ring 11. The lower end surface of the limiting nut 12 extends into the inner cavity of the guide tube 5 and defines the maximum position of the upward movement of the limiting ring 11. When the limiting ring 11 moves upward and abuts against the lower end surface of the limiting nut 12, it is positioned, preventing the limiting ring 11 from slipping off from the upper end of the guide tube 5 under unexpected circumstances.

[0023] Anti-slip pads 14 are provided at the four peripheral edges of the bottom of the bottom plate 2. A plurality of anti-slip grooves are provided at the bottom of the anti-slip pad 14. The anti-slip pad 14 is made of a medical grade silicone material, which can increase the frictional force when the bottom plate 2 contacts the skin surface and prevent the device from sliding during the operation process.

[0024] A gripping portion 13 is fixedly connected to one side of the bottom plate 2. The gripping portion 13 is cylindrical and is provided perpendicular to the bottom plate 2. The gripping portion 13 is made of a medical grade stainless steel material, and an anti-slip texture is provided on the outer surface, which is convenient for the operator to grip, position and operate the device.

[0025] The operating principle and operation procedure of the present invention are as follows.

[0026] In the preoperative preparation stage, the surgeon first holds the ultrasonic probe and scans the skin surface of the puncture area of a patient scheduled for thoracic, dorsal or upper abdominal surgery (such as lung surgery), observes the ultrasonic image to position the target gap between the deep surface of the erector spinae muscle and the transverse process, and determines the optimal puncture site and puncture path.

[0027] In the puncture operation stage, the surgeon inserts the ultrasonic probe into the accommodation space formed between the two side walls 3 of the base 1 and makes the ultrasonic probe contact the buffer layer inside the side wall 3. The buffer layer protects and positions the ultrasonic probe and prevents the ultrasonic probe from sliding or shifting during the operation process. The detection surface of the ultrasonic probe can pass through the acoustic transmission hole in the center of the bottom plate 2 and directly contact the skin surface of the patient to realize the normal ultrasonic scanning function. The surgeon holds the gripping part 13 and places the anti-slip pad 14 at the bottom of the bottom plate 2 on the skin surface of the patient. The anti-slip groove at the bottom of the anti-slip pad 14 generates frictional force between the skin surface, making the device stably arranged on the skin at the puncture site and difficult to slide.

[0028] Next, under the real-time guidance of the ultrasonic image, the surgeon observes the orientation of the target gap and determines the required puncture angle. Subsequently, the surgeon loosens the adjusting screw 9 to release the lock on the fixed sleeve 6, manually moves the flexible tube part of the guide tube 5, and aims its axis in the direction of the target gap. Then, observe the angle scale line provided on the outer surface of the adjusting plate 8, adjust the guide tube 5 to the desired angle value, and then tighten the adjusting screw 9 to lock the guide tube 5 at the selected angle. During the rotation process of the guide tube 5, the fixed sleeve 6 moves along an arc trajectory, and the adjusting screw 9 slides synchronously along the arc direction in the arc-shaped long adjusting groove. The movement trajectories of both are completely aligned, ensuring the smoothness and non-catching of the angle adjustment process.

[0029] Next, the operator rotates the limiting ring 11 using an adjustment tool to adjust its position within the lumen of the guide tube 5, according to the required puncture depth. The outer wall of the limiting ring 11 is provided with male threads that screw into the inner wall of the guide tube 5, and when the limiting ring 11 is rotated, it moves up and down along the axial direction of the guide tube 5. After the operator adjusts the limiting ring 11 to the position corresponding to the target depth, the limiting nut 12 is provided in the lumen of the upper end of the guide tube 5 and acts as an auxiliary anti-dislodgement member for the limiting ring 11. The lower end surface of the limiting nut 12 defines the maximum upward movement position of the limiting ring 11 and prevents the limiting ring 11 from slipping out of the upper end of the guide tube 5 in unexpected circumstances. The position of the limiting ring 11 determines the maximum insertion depth of the puncture needle. When the puncture needle is inserted from the upper end of the guide tube 5 and pushed downward, the needle shaft of the puncture needle passes through the central through-hole of the limiting ring 11, and when the base of the puncture needle contacts the upper surface of the limiting ring 11, the set maximum depth has been reached. Based on this, the operator can control the insertion depth and avoid the puncture needle penetrating too deeply and damaging the surrounding tissue.

[0030] Next, the surgeon inserts the puncture needle from the upper end of the guide tube 5, and the puncture needle sequentially passes through the upper lumen of the guide tube 5, the central through-hole of the restriction ring 11, and the lower lumen of the guide tube 5, before exiting from the lower end of the guide tube 5. Multiple scale marks provided on the inner wall of the guide tube 5 are evenly distributed along the axial direction, and the surgeon can determine the depth to which the puncture needle has entered the guide tube 5 based on the scale marks, and by combining this with the position setting of the restriction ring 11, accurate control of the insertion depth can be achieved.

[0031] Furthermore, under ultrasound guidance, the operator can fine-tune the position of the entire device, ensuring that the axial direction of the guide tube 5 is aligned with the target gap between the deep surface and transverse process of the erector spinae muscle. The side walls 3 of the base 1 provide a stable housing space for the ultrasound probe, allowing the operator to fine-tune the position and angle of the device under real-time guidance of ultrasound images, thereby guiding the puncture needle through the target gap via the optimal path. The angle adjustment mechanism 7 allows for flexible adjustment of the angle of the guide tube 5 within a range of 15° to 45°, accommodating different patient body types and anatomical differences at the puncture site.

[0032] Finally, after the puncture needle reaches the target position, the operator can perform subsequent procedures such as drug injection to complete the erector spinae muscle surface block. Throughout the entire procedure, the needle guidance mechanism 4 provides a stable path for the puncture needle, reducing puncture deviation due to operator hand tremors. The angle adjustment mechanism 7 allows the puncture needle to enter the target area at the correct angle. The depth limiting mechanism 10 limits the maximum insertion depth of the puncture needle, preventing damage to surrounding tissues. The combined action of these mechanisms effectively improves the puncture accuracy and success rate of ultrasound-guided erector spinae muscle surface blocks. [Explanation of Symbols]

[0033] 1 base 2 Bottom plate 3 side wall 4. Course guide mechanism 5 Guide tubes 6. Fixing sleeve 7 Angle adjustment mechanism 8 Adjustment Plate 9 Adjustment screw 10 Depth Limiting Mechanism 11 Restriction Rings 12 Restriction nuts 13 Gripping part 14 Anti-slip pads

Claims

1. A spinal erector muscle surface block puncture needle guide device for postoperative pain relief, comprising: a base having a housing space for positioning an ultrasound probe and having an acoustically transparent hole at the bottom for the detection surface of the ultrasound probe to pass through; a guide tube for passing a puncture needle and providing a guide path for the puncture needle, wherein the guide tube includes a connecting portion and a flexible tube portion connected to the connecting portion, and the connecting portion is connected to the base; an angle adjustment mechanism provided on the base and connected to the guide tube for adjusting and locking the angle of the guide tube with respect to the base; and a depth limiting mechanism provided in the lumen of the guide tube.

2. The angle adjustment mechanism comprises an adjustment plate fixed on the base and provided with an arc-shaped elongated adjustment groove, wherein the curvature of the adjustment groove aligns with the movement trajectory of the fixed sleeve when the flexible tube portion of the guide tube rotates; a fixed sleeve fitted onto the outer wall of the guide tube; and an adjustment screw that penetrates the adjustment groove and screws into the fixed sleeve, characterized in that it includes a spinal erector muscle surface block puncture needle guide device for postoperative pain relief according to claim 1.

3. The depth limiting mechanism is characterized by comprising: a limiting ring provided in the lumen of the guide tube and having a central through-hole through which the needle shaft of the puncture needle passes, and whose outer wall is screwed with the inner wall of the guide tube; and a limiting nut screwed into the lumen at the upper end of the guide tube, whose inner diameter is smaller than the outer diameter of the limiting ring, and whose lower end surface is located within the lumen of the guide tube to define the maximum upward movement of the limiting ring, as described in claim 1.

4. The spinal erector muscle surface block puncture needle guide device for postoperative pain relief according to claim 1, characterized in that anti-slip pads are provided on the four peripheral edges of the bottom of the base, the anti-slip pads are made of medical-grade silicone material and have anti-slip grooves on their bottoms.

Images