1. Obstetric Instruments
Dr. Madhavi Karki

2. SIM’S SPECULUM:
The blades are of unequal breadth to facilitate the introduction into the vagina depending on its size.
It is used in obstetrics for :
1. To toilet the vagina following delivery
2. To visualize any injured site on the cervix or vagina
3. To inspect any local lesion causing bleeding either in APH/ threatened abortion
4.During D+E operation

3. MULTIPLE TOOTHED VULSELLUM:
It is used to catch hold the anterior lip of the cervix in D+E operation. As it produces trauma to the soft and vascular cervix, Allis tissue forceps is used instead.

4. ALLIS TISSUE FORCEPS
It is used to catch hold of the anterior lip of the cervix in D+E operation.
To hold the episiotomy wound during repair
To catch hold of the torn ends of the sphincter ani externus prior to
suture in repair of complete perineal tear
To hold the margins and angles of uterine flaps in LSCS

5. UTERINE SOUND
It is a pointed, graduated, malleable, metallic uterine sound.
It is used prior to dilatation of the cervix in D+E operation to know
the length of the uterine cavity and to note the position of the uterus

6. Cervical Dilators: It is used in dilatation of the cervix
prior to evacuation operation.
Degree of dilatation required:
Incomplete abortion – sufficient to
introduce the index finger
In suction evacuation – one size
smaller than the size of suction
cannula
In M.T.P by D+E- sufficient to
introduce the ovum forceps

7. OVUM FORCEPS:
It has got no catch and the blades are slightly bent. Absence of the
catch minimizes uterine injury, if accidentally caught or crushing of
conceptus.

8. UTERINE CURETTE:
It maybe sharp at both the ends or sharp at one end and blunt at the
other.
Its common use in obstetrics is in the D+C for incomplete abortion
In D+E operation, the curette is done by blunt curette as uterine wall
is very soft.

9. Plastic Suction Cannula (Karman’s)
It is of different sizes and the approximate size required for a
particular case equals to the weeks of pregnancy to be terminated
The plastic cannula has got advantages over a metallic one-
as it causes less damage to the uterine wall and the products
sucked out can be visible. The vacuum must be broken before
withdrawal