Bird brain stereotaxic device

Abstract

The utility model relates to the technical field of bird hearing perception system research, concretely relates to a bird brain stereoscopic positioning device, is applicable to small and medium size birds, including bottom plate, ear canal positioner, bill angle positioner and bill mouth positioner, the stand is set up on the bottom plate, the ear lever is fixed on the cross arm of stand, the ear canal positioner includes the left and right two parallel setting stands, left and right two ear levers, the stand is in the shape of " " the ear lever includes inner ear lever, outside sleeve lever, top cone and fastening screw, outside sleeve lever can along inner ear lever and carry out the translational sliding, and the position is fixed through fastening screw, the bill angle positioner includes side plate, bill lever and locking screw, the bill mouth positioner includes base, positioning stand, bill mouth positioning head, compression ring, the base can slide horizontally, the utility model has reduced the ear canal blockage and the phenomenon of weak support because of traditional embedded ear lever and single side bill lever, greatly improves the listening range and effect of bird hearing perception system to sound stimulation.

Description

Technical Field

[0001] This utility model relates to the field of research technology of bird auditory perception system, specifically to a bird brain stereoscopic positioning device. Background Technology

[0002] Stereotactic devices are essential tools for performing brain surgery and have wide applications in neuroscience. Stereotactic technology establishes a three-dimensional Cartesian coordinate system (X, Y, Z axes) based on external skull landmarks (such as the anterior fontanelle and the external auditory canal axis), and achieves precise localization of the target brain region by adjusting the displacement of the manipulator arm. The function of the stereotactic device is to establish a relatively stable three-dimensional coordinate system by fixing support points such as the mouth and ear canal.

[0003] Stereotactic devices used in both mammals and birds rely on conical ear rods inserted into the animal's ear canal, working in conjunction with the beak fulcrum to provide support for head fixation. Because the ear rods obstruct the ear canal during use, they impede the animal's natural sound transmission pathways, making it difficult to conduct auditory evoked experiments requiring stereotactic brain positioning. Furthermore, the large beak rod support mechanism severely interferes with the lateral sound propagation path.

[0004] To address the problem of obstructed sound transmission channels, the novel rat zygomatic arch rod (CN201920899U) improves upon the aforementioned issue in a stereotaxic device for rats. This improvement involves designing a rat zygomatic arch rod in a "⊥" shape, where "—" represents the long axis of the rod, called the central column, and "|" represents a vertical protrusion on the central column, called the upright column. The rat zygomatic arch rod does not affect the natural morphology of the rat's auricle and external auditory canal during use, ensuring a normal sound transmission path in experiments. To address the issue of the beak rod support mechanism blocking lateral sound, invention patent CN115192218A, a wide-field-of-view pigeon stereotaxic device operation method, improves upon the traditional bilateral beak rod support mechanism of pigeon stereotaxic devices by using a single-sided sliding beak rod support structure, significantly reducing the risk of obstruction.

[0005] However, while the above methods have alleviated the problems of sound transmission pathway obstruction and sound occlusion in rat auditory experiments to some extent, the following problems still exist for brain stereotaxic devices used in research on the auditory perception system of birds:

[0006] Obstruction of auditory stimulus propagation: Existing cone-shaped ear rods embedded in the external auditory canal can block the sound wave path, causing sound attenuation or reflection, which affects the accuracy of auditory experiments.

[0007] Inadequate support from one side of the beak: Although the improved one-sided beak significantly reduces the blocking effect of sound from the side, the long beak generates a large torsional moment, resulting in poor support for the bird's beak corner.

[0008] Risk of skull injury: Existing ear rod materials (such as metal) may compress the temporomandibular joint, causing micro-injuries to the skull of experimental animals, affecting the long-term reliable use of experimental animals. Utility Model Content

[0009] Therefore, the technical problem to be solved by this utility model is to overcome the defects in the prior art and thus provide a bird brain stereoscopic positioning device that is suitable for small and medium-sized birds.

[0010] The bird brain stereoscopic positioning device includes a base plate, an ear canal locator, a beak angle locator, and a beak mouth locator;

[0011] The ear canal locator includes two parallel uprights and two ear rods. The uprights are in the shape of a "┑". The left ear rod is fixed to the left upright, and the right ear rod is fixed to the right upright. The ear rods are fixed to the horizontal arm of the uprights. The ear rods include an inner ear rod, an outer sleeve rod, a top cone, and a fastening threaded pin. The outer sleeve rod can slide along the inner ear rod and is fixed in position by the fastening threaded pin. The top cone is made entirely of metal.

[0012] The beak locator includes two side plates, a beak rod, and a locking screw; the two side plates are provided with sliding grooves and are respectively fixed to the left and right ear rods; the beak rod passes through the sliding grooves on the two side plates and is fixed by the locking screw;

[0013] The beak positioning device includes a base, a positioning column, a beak positioning head, and a pressure ring; the base can slide horizontally; the positioning column stands vertically on the base; the beak positioning head can slide on the positioning column and is fixed by a positioning head screw; the pressure ring can be rotatably fixed on the beak positioning head, and the adjustment angle of the pressure ring can be adjusted by a pressure ring adjustment screw.

[0014] Furthermore, the inner ear rod is square; the vertical arms of the left and right uprights are respectively set on two parallel upright tracks on the base plate; the horizontal arm of the upright has a square hole, the size of which matches the shape of the inner ear rod, and the ear rod is fixed in the square hole through the inner ear rod. A scale is marked on the left and right inner ear rods.

[0015] Furthermore, the top cone penetrates the inner ear rod, and the length of the top cone is greater than the length of the inner ear rod. A knob is provided at the tail of the top cone, and the movement of the top cone in the inner ear rod is adjusted by the thread.

[0016] Furthermore, the outer sleeve is cap-shaped, with a circular top cone hole on its front end, the size of which matches the diameter of the top cone. A sound passage hole is located on the side of the front end of the outer sleeve, behind which is a square hole matching the size of the inner ear rod. A rectangular hole is provided on the outer sleeve corresponding to the position on the inner ear rod where the scale is marked, facilitating observation of the scale.

[0017] Furthermore, the fastening threaded pins are installed on the outer sleeve rod, and the outer sleeve rod is fixed to the inner ear rod by threads.

[0018] Furthermore, square holes are provided on the left and right side plates, the size of which matches the size of the inner ear rod. The left and right side plates are fixed to the left and right ear rods respectively through the square holes. The sliding groove is inclined downwards at 45°. Preferably, the side plate is in the shape of a right trapezoid. When the side plate is installed on the ear rod, the short side of the trapezoid is parallel to the surface of the base plate, the angle between the hypotenuse and the long base is 45°, and the direction of the sliding groove is parallel to the hypotenuse.

[0019] Furthermore, the base is mounted on a base slide rail, which is located in front of and parallel to the column track; the base has an elongated hole, through which the base fixing screw passes to fix it to the base plate.

[0020] Furthermore, the rear end of the beak positioning head is provided with a positioning column hole, the shape of which matches the size of the positioning column, and the beak positioning head is installed on the column hole through the column hole; the front end of the beak positioning head is provided with a beak hole, and a pressure ring base is provided above the beak positioning head near the column hole, and the rear end of the pressure ring is rotatably installed on the pressure ring base.

[0021] Furthermore, a pressure ring strip hole is provided in the middle of the pressure ring, and the pressure ring adjusting screw passes through the pressure ring strip hole and is installed on the beak positioning head.

[0022] Furthermore, an open ring is provided at the front end of the pressure ring. The middle part of the pressure ring is a cuboid, and the open ring is U-shaped or notched circular, with the plane of the open ring parallel to the upper surface of the middle part.

[0023] The specific operating steps are as follows:

[0024] Step 1: Adjust the position of the left and right pillars: Based on the size of the experimental birds, slide the left and right pillars along the bottom pillar track to the appropriate position and fix them.

[0025] Step 2: Adjust the ear canal locator: Loosen the threaded pins at the top of the horizontal arms of the left and right uprights of the ear canal locator, pull the distance between the left and right ear rods, and first fix the position of the left ear rod by the threaded pin on the left upright, while keeping the corresponding fastening threaded pins of the left and right outer sleeves loose, and pull the left and right outer sleeves to the sides respectively.

[0026] Step 3: Install the beak locator: Loosen the locking screws on both sides of the beak locator, adjust the beak rod of the beak locator, and push it to the lower edge.

[0027] Step Four: Installing Ear Canal Locators on Birds: First, anesthetize the birds, then disinfect the periphery of their ear canals. Fix the bird's left ear canal to the left ear rod. After securing the bird's left ear canal, slowly push the right ear rod into the bird's right ear canal to secure it. Then adjust the position of the right ear rod until it lightly touches the right ear canal for fixation. Finally, observe the scales on the left and right ear rods, loosen the threaded pins at the top of the horizontal arms of the left and right posts, and fine-tune the positions of the left and right ear rods until they are symmetrical before fixing them in place.

[0028] Step 5: Install the beak rod on the bird: Separate the bird's upper and lower beaks, insert the beak rod into it and move it along the slide to the beak corner. At the same time, fix the beak corner support point by tightening the locking screws on the left and right sides.

[0029] Step Six: Adjust the position of the beak locator and horizontal positioning arm: Adjust the position of the beak locator on the horizontal moving track so that the beak positioning head is located midway between the nose and the tip of the upper beak. Secure the current horizontal position using the base fixing screws. Adjust the position of the horizontal positioning arm on the vertical moving track so that the bird's upper beak is inserted into the beak hole of the beak positioning head. Then, secure the position of the beak positioning head using the positioning head screws. Finally, rotate the adjusting ring adjusting screw to adjust the pressure on the bird's maxilla, achieving complete fixation of the bird's brain.

[0030] Step 7: Perform pre-experiment preparations on the relevant brain regions of the bird. After the preparations are completed, loosen the fastening screws, push the outer mesh rods on both sides inward to press against the outer ear of the experimental animal, and fix the ear support point of the experimental animal by tightening the fastening screws on both sides. Then slowly rotate the top cone out to keep the bird's ear canal open.

[0031] The technical solution of this utility model has the following advantages:

[0032] 1. To address the shortcomings of existing stereoscopic head positioning devices for birds in conducting research on auditory perception systems, we invented an inner ear rod with a retractable apical cone and an outer sleeve rod with a flexible material tip (such as medical-grade resin) and a sound passage hole. We also designed a double-sided through-hole beak locator that can slide and lock. While providing sufficient fixed support points for the ears and beaks of birds, we significantly alleviate the problems of sound blockage and ear canal obstruction, providing important tool support for conducting research on the auditory perception system of birds.

[0033] 2. This invention will significantly reduce the ear canal blockage and poor support caused by traditional embedded ear rods and single-sided beak rods, greatly improve the range and effect of the bird's auditory perception system in receiving sound stimuli, and ensure that experimental animals are not subjected to additional pain during the experiment. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a front view of the bird brain stereoscopic positioning device of this utility model;

[0036] Figure 2 for Figure 1 The ear rods shown are, from top to bottom, in the state of the ear rod tip cone extending ( Figure 2 A) The outer sleeve of the ear rod is extended ( Figure 2 B) and the outer sleeve supports the periphery of the ear canal and the top cone is rotated out ( Figure 2 C);

[0037] Figure 3 for Figure 1 The diagram shows a three-dimensional structure of the beak positioner.

[0038] Figure 4 for Figure 1 The diagram shows a cross-sectional view of the ear rod and the external auditory canal of the experimental animal.

[0039] Figure 5 for Figure 1 A schematic diagram of the three-dimensional structure of the outer sleeve rod;

[0040] Figure 6 for Figure 1 A three-dimensional structural diagram showing the insertion of a top cone into the outer sleeve rod and the omission of the inner lug rod;

[0041] Figure 7 for Figure 1 A three-dimensional structural diagram of the pressure ring in the middle.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Base plate; 2-Ear canal locator; 3-Beak angle locator; 4-Beak mouth locator; 21-Post; 22-Ear rod; 221-Inner ear rod; 222-Outer sleeve rod; 223-Top cone; 224-Fasting threaded nail; 211-Post rail; 31-Side plate; 32-Beak rod; 33-Locking threaded nail; 34-Slide groove; 41-Base; 42-Positioning post; 43-Beak mouth positioning head; 44-Pressure ring; 45-Positioning head screw; 46-Pressure ring adjusting screw; 47-Base slide rail; 48-Base fixing screw; 2221-Top cone hole; 441-Pressure ring base; 2222-Sound hole; 2223-Small cylinder; 2224-Support arm; 2225-Outer sleeve rod square body; 2226-Strip square hole. Detailed Implementation

[0044] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0045] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0046] Example 1

[0047] like Figure 1-7 A bird brain stereoscopic positioning device includes a base plate 1, an ear canal locator 2, a beak angle locator 3, and a beak mouth locator 4. The ear canal locator includes two parallel columns 21 and two ear rods 22. The columns 21 are in a "┑" shape, with the left ear rod 22 fixed to the left column 21 and the right ear rod 22 fixed to the right column 21, both fixed to the horizontal arm of the columns 21. Each ear rod 22 includes an inner ear rod 221, an outer sleeve rod 222, a top cone 223, and a fastening threaded pin 224. The outer sleeve rod 222 can slide along the inner ear rod 221 and is fixed in position by the fastening threaded pin 224. The top cone 223 has a pointed metal tip. The two columns 21 are respectively positioned in two parallel column tracks 211.

[0048] The beak locator 3 includes two side plates 31, a beak rod 32, and locking screws 33. The two side plates 31 are provided with sliding grooves 34, and the two side plates 31 are respectively fixed to the two ear rods 22. The beak rod 32 passes through the sliding grooves 34 on the two side plates 31 and is fixed by the locking screws 33. When the locking screws 33 are tightened, the two locking screws 33 press against the outside of the side plates 31, thereby fixing the beak rod 32.

[0049] The beak positioning device 4 includes a base 41, a positioning column 42, a beak positioning head 43, and a pressure ring 44. The base 41 can slide horizontally. The positioning column 42 stands vertically on the base 41. The beak positioning head 43 can slide on the positioning column 42 and is fixed by a positioning head screw 45. The pressure ring 44 is rotatably fixed on the beak positioning head 43, and the adjustment angle of the pressure ring 44 can be adjusted by a pressure ring adjustment screw 46.

[0050] Furthermore, the base 41 is mounted on the base slide rail 47, which is located in front of and parallel to the column track 211. The base 41 has an elongated hole through which the base fixing screw 48 passes and is fixed to the base plate 1. When the base fixing screw 48 rotates clockwise, it penetrates deeper into the base plate 1, and its rear end presses against the upper surface of the base 41, thus fixing the base 41 in position. When the base fixing screw 48 rotates counterclockwise, it rotates out of the base plate 1, and its rear end separates from the upper surface of the base 41. Because of the elongated hole on the base 41, it can move along the base slide rail 47, thereby driving the beak positioning head 43 to move.

[0051] Furthermore, the inner ear rod 221 is square; the vertical arms of the left and right uprights 21 are respectively set on two parallel upright tracks 211 on the base plate 1; the horizontal arm of the uprights 21 is provided with a square hole facing horizontally, the size of the square hole matching the shape of the inner ear rod, and the ear rod is fixed in the square hole through the inner ear rod. The left and right inner ear rods are marked with scales. Preferably, one diagonal of the square hole is vertically upward, so that one diagonal of the cross-section of the inner ear rod 221 is also vertically upward, allowing for observation of the scale size on the inner ear rod 221.

[0052] Furthermore, the top cone 223 penetrates the inner ear rod 221, and the length of the top cone 223 is greater than the length of the inner ear rod 221. A knob is provided at the tail of the top cone 223. The movement of the top cone 223 in the inner ear rod 221 is adjusted by the thread. Specifically, rotating the knob at the tail of the top cone 223 can control the position of the top cone 223 in the inner ear rod 221. The head of the top cone 223 is a metal tip.

[0053] Furthermore, the outer sleeve 222 is cap-shaped, with a circular top cone hole 2221 at its front end. The size of the top cone hole 2221 matches the diameter of the top cone 223. The top cone hole connects to a sound hole 2222 at the rear, and behind the sound hole 2222 is a square hole for the outer sleeve. The size of the square hole in the outer sleeve matches the size of the inner ear rod 221, allowing the outer sleeve 222 to slide on the inner ear rod 221. The outer sleeve has a rectangular hole corresponding to the position on the inner ear rod where a scale is marked, facilitating observation of the scale. The top cone hole is covered with a soft, flexible material, such as medical-grade resin or rubber.

[0054] Preferably, the top center of the outer sleeve rod 222 is a small cylinder 2223, from which four support arms 2224 extend. These support arms 2224 extend to the four corners of the square body 2225 of the outer sleeve rod, supporting the small cylinder 2223. The hole in the small cylinder 2223 forms a top conical hole 2221, and adjacent support arms 2224 form a sound passage hole 2222. The square body 2225 of the outer sleeve rod behind the small cylinder 2223 has a square hole, the size of which matches the size of the inner ear rod. The square body 2225 of the outer sleeve rod has four strip-shaped square holes 2226 on its four surfaces, located near the upper end of the square body 2225. The shape of the front end of the inner ear rod 221 matches the conical space formed by the four support arms 2224.

[0055] Furthermore, the fastening threaded pin 224 is disposed on the outer sleeve 222 and the outer sleeve 222 is fixed to the inner ear rod 221 by means of threads. Specifically, when the fastening threaded pin 224 rotates clockwise, the fastening threaded pin 224 will press against the outer surface of the inner ear rod 221, thereby fixing the outer sleeve 222 to the inner ear rod 221.

[0056] Furthermore, the left and right side plates 31 are provided with square holes, the size of which matches the size of the inner ear rod 221. The left and right side plates 31 are fixed to the left and right ear rods 221 respectively through the square holes. The sliding groove 34 is inclined downward at 45°. Preferably, the side plate 31 is in the shape of a right trapezoid. When the side plate 31 is installed on the inner ear rod 221, the short side of the trapezoid is parallel to the surface of the base plate 1, the angle between the hypotenuse and the long base is 45°, and the direction of the sliding groove 34 is parallel to the hypotenuse.

[0057] Furthermore, the rear end of the beak positioning head 43 is provided with a positioning post hole, the shape of which matches the size of the positioning post 42. The beak positioning head 43 is mounted on the positioning post 42 through the positioning post hole. The front end of the beak positioning head 43 is provided with a beak hole, and a pressure ring base 441 is provided above the beak positioning head 43 near the positioning post hole. The rear end of the pressure ring 44 is rotatably mounted on the pressure ring base 441. The pressure ring base 441 is fixed to the beak positioning head 43 and moves up and down with the beak positioning head 43. Specifically, the cross-section of the positioning post 42 is a circle with a notch, and the shape of the positioning post hole matches the cross-section of the positioning post 42, which can prevent the beak positioning head 43 from rotating when moving on the positioning post 42, and can better orient itself.

[0058] Furthermore, a pressure ring 44 has a pressure ring slot 442 in its center. A pressure ring adjusting screw 46 passes through the pressure ring slot 442 and is mounted on the beak positioning head 43. Rotating the pressure ring adjusting screw 46 clockwise causes it to insert deeper into the beak positioning head 43, which in turn moves the pressure ring 44, thus securing the bird's head. Furthermore, an open ring 443 is provided at the front end of the pressure ring 44. The center of the pressure ring is rectangular, and the open ring 443 is U-shaped or notched, with the plane of the open ring 443 parallel to the upper surface of the center. Preferably, the end of the open ring 443 furthest from the center of the pressure ring is bent downwards.

[0059] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A bird brain stereoscopic positioning device, characterized in that, The device includes a base plate, an ear canal locator, a beak angle locator, and a beak mouth locator; The ear canal locator includes two parallel uprights and two ear rods. The uprights are in the shape of a "┑". The left ear rod is fixed to the left upright, and the right ear rod is fixed to the right upright. Each ear rod includes an inner ear rod, an outer sleeve rod, a top cone, and a fastening threaded pin. The outer sleeve rod can slide along the inner ear rod and is fixed in position by the fastening threaded pin. The uprights are set on the base plate, and the ear rods are fixed to the cross arm of the uprights. The beak locator includes two side plates, a beak rod, and a locking screw; the two side plates are provided with sliding grooves and are respectively fixed to the left and right ear rods; the beak rod passes through the sliding grooves on the two side plates and is fixed by the locking screw; The beak positioning device includes a base, a positioning column, a beak positioning head, and a pressure ring; the base can slide horizontally; the positioning column stands vertically on the base; the beak positioning head can slide on the positioning column and is fixed by a positioning head screw; the pressure ring is rotatably fixed on the beak positioning head, and the pressure of the pressure ring can be adjusted by a pressure ring adjusting screw.

2. The bird brain stereotactic device according to claim 1, characterized in that, The inner ear rod is square; the vertical arms of the two columns on the left and right are respectively set on two parallel column tracks on the base plate; the horizontal arm of the column is provided with a square hole, the size of which matches the shape of the inner ear rod, and the ear rod is fixed in the square hole through the inner ear rod.

3. The bird brain stereotactic device according to claim 1, characterized in that, The top cone passes through the inner ear rod, and the length of the top cone is greater than the length of the inner ear rod. A knob is provided at the tail of the top cone, and the movement of the top cone in the inner ear rod is adjusted by the thread.

4. The bird brain stereotactic device according to claim 3, characterized in that, The outer sleeve rod is cap-shaped, with a circular top cone hole on its front end, the size of which matches the diameter of the top cone; a sound passage hole is provided on the side of the front end of the outer sleeve rod, and behind the sound passage hole is a square hole of the sleeve rod, the size of which matches the size of the inner ear rod; a flexible material is provided on the top cone hole.

5. The bird brain stereotactic device according to claim 4, characterized in that, The fastening threaded pin is installed on the outer sleeve rod, and the outer sleeve rod is fixed to the inner ear rod by threads.

6. The bird brain stereotactic device according to claim 2, characterized in that, The left and right side plates are provided with square holes, the size of which matches the size of the inner ear rod. The left and right side plates are fixed to the left and right ear rods respectively through the square holes. The slide is inclined at 45° downwards.

7. The bird brain stereotactic device according to claim 2, characterized in that, The base is mounted on a base slide rail, which is located in front of and parallel to the column track. The base has an elongated hole through which the base fixing screws pass to fix it to the base plate.

8. The bird brain stereotactic device according to claim 7, characterized in that, The beak positioning head has a positioning post hole at its rear end, the shape of which matches the size of the positioning post. The beak positioning head is installed on the positioning post through the positioning post hole. The beak positioning head has a beak hole at its front end, and a pressure ring base is located above the beak positioning head near the post hole. The rear end of the pressure ring is rotatably installed on the pressure ring base.

9. The bird brain stereotactic device according to claim 8, characterized in that, A pressure ring strip hole is provided in the middle of the pressure ring, and the pressure ring adjusting screw is installed on the beak positioning head through the pressure ring strip hole.

10. The bird brain stereotactic device according to claim 1, characterized in that, An open ring is provided at the front end of the pressure ring.

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